From b8fe5660304a092f6abcd254b4e79e5af3f6d708 Mon Sep 17 00:00:00 2001
From: Patrick Fic <snaptsoft@gmail.com>
Date: Thu, 22 Dec 2022 15:18:29 -0800
Subject: [PATCH] Cypress reconfiguration.

---
 client/cypress.config.js                      |     9 +
 client/cypress.json                           |     8 -
 client/cypress/fixtures/profile.json          |     5 -
 client/cypress/fixtures/users.json            |     1 -
 .../01-General Render/01-home.spec.js         |    23 -
 .../1-getting-started/todo.spec.js            |   143 -
 .../2-advanced-examples/actions.spec.js       |   299 -
 .../2-advanced-examples/aliasing.spec.js      |    39 -
 .../2-advanced-examples/assertions.spec.js    |   177 -
 .../2-advanced-examples/connectors.spec.js    |    97 -
 .../2-advanced-examples/cookies.spec.js       |    77 -
 .../2-advanced-examples/cypress_api.spec.js   |   202 -
 .../2-advanced-examples/files.spec.js         |    88 -
 .../2-advanced-examples/local_storage.spec.js |    52 -
 .../2-advanced-examples/location.spec.js      |    32 -
 .../2-advanced-examples/misc.spec.js          |   104 -
 .../2-advanced-examples/navigation.spec.js    |    56 -
 .../network_requests.spec.js                  |   163 -
 .../2-advanced-examples/querying.spec.js      |   114 -
 .../spies_stubs_clocks.spec.js                |   205 -
 .../2-advanced-examples/traversal.spec.js     |   121 -
 .../2-advanced-examples/utilities.spec.js     |   110 -
 .../2-advanced-examples/viewport.spec.js      |    59 -
 .../2-advanced-examples/waiting.spec.js       |    31 -
 .../2-advanced-examples/window.spec.js        |    22 -
 client/cypress/plugins/index.js               |    22 -
 client/cypress/support/commands.js            |     4 +-
 client/cypress/support/{index.js => e2e.js}   |     4 +-
 client/cypress/tsconfig.json                  |     8 -
 client/package.json                           |    11 +-
 client/patches/peerjs+1.3.2.patch             | 13087 ----------------
 client/src/index.js                           |     1 -
 client/yarn.lock                              |   125 +-
 33 files changed, 46 insertions(+), 15453 deletions(-)
 create mode 100644 client/cypress.config.js
 delete mode 100644 client/cypress.json
 delete mode 100644 client/cypress/fixtures/profile.json
 delete mode 100644 client/cypress/fixtures/users.json
 delete mode 100644 client/cypress/integration/01-General Render/01-home.spec.js
 delete mode 100644 client/cypress/integration/1-getting-started/todo.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/actions.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/aliasing.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/assertions.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/connectors.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/cookies.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/cypress_api.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/files.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/local_storage.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/location.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/misc.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/navigation.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/network_requests.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/querying.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/spies_stubs_clocks.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/traversal.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/utilities.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/viewport.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/waiting.spec.js
 delete mode 100644 client/cypress/integration/2-advanced-examples/window.spec.js
 delete mode 100644 client/cypress/plugins/index.js
 rename client/cypress/support/{index.js => e2e.js} (88%)
 delete mode 100644 client/cypress/tsconfig.json
 delete mode 100644 client/patches/peerjs+1.3.2.patch

diff --git a/client/cypress.config.js b/client/cypress.config.js
new file mode 100644
index 000000000..97f47c412
--- /dev/null
+++ b/client/cypress.config.js
@@ -0,0 +1,9 @@
+const { defineConfig } = require("cypress");
+
+module.exports = defineConfig({
+  e2e: {
+    setupNodeEvents(on, config) {
+      // implement node event listeners here
+    },
+  },
+});
diff --git a/client/cypress.json b/client/cypress.json
deleted file mode 100644
index 29663f948..000000000
--- a/client/cypress.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "baseUrl": "http://localhost:3000",
-  "experimentalStudio": true,
-  "env": {
-    "FIREBASE_USERNAME": "cypress@imex.test",
-    "FIREBASE_PASSWORD": "cypress"
-  }
-}
diff --git a/client/cypress/fixtures/profile.json b/client/cypress/fixtures/profile.json
deleted file mode 100644
index b6c355ca5..000000000
--- a/client/cypress/fixtures/profile.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "id": 8739,
-  "name": "Jane",
-  "email": "jane@example.com"
-}
\ No newline at end of file
diff --git a/client/cypress/fixtures/users.json b/client/cypress/fixtures/users.json
deleted file mode 100644
index fe51488c7..000000000
--- a/client/cypress/fixtures/users.json
+++ /dev/null
@@ -1 +0,0 @@
-[]
diff --git a/client/cypress/integration/01-General Render/01-home.spec.js b/client/cypress/integration/01-General Render/01-home.spec.js
deleted file mode 100644
index 32ec9d565..000000000
--- a/client/cypress/integration/01-General Render/01-home.spec.js	
+++ /dev/null
@@ -1,23 +0,0 @@
-/// <reference types="Cypress" />
-const { FIREBASE_USERNAME, FIREBASE_PASSWORcD } = Cypress.env();
-describe("Renders the General Page", () => {
-  beforeEach(() => {
-    cy.visit("/");
-  });
-  it("Renders Correctly", () => {});
-  it("Has the Slogan", () => {
-    cy.findByText("A whole x22new kind of shop management system.").should(
-      "exist"
-    );
-    /* ==== Generated with Cypress Studio ==== */
-    cy.get(
-      ".ant-menu-item-active > .ant-menu-title-content > .header0-item-block"
-    ).click();
-    cy.get("#email").clear();
-    cy.get("#email").type("patrick@imex.dev");
-    cy.get("#password").clear();
-    cy.get("#password").type("patrick123{enter}");
-    cy.get(".ant-form > .ant-btn").click();
-    /* ==== End Cypress Studio ==== */
-  });
-});
diff --git a/client/cypress/integration/1-getting-started/todo.spec.js b/client/cypress/integration/1-getting-started/todo.spec.js
deleted file mode 100644
index 4768ff923..000000000
--- a/client/cypress/integration/1-getting-started/todo.spec.js
+++ /dev/null
@@ -1,143 +0,0 @@
-/// <reference types="cypress" />
-
-// Welcome to Cypress!
-//
-// This spec file contains a variety of sample tests
-// for a todo list app that are designed to demonstrate
-// the power of writing tests in Cypress.
-//
-// To learn more about how Cypress works and
-// what makes it such an awesome testing tool,
-// please read our getting started guide:
-// https://on.cypress.io/introduction-to-cypress
-
-describe('example to-do app', () => {
-  beforeEach(() => {
-    // Cypress starts out with a blank slate for each test
-    // so we must tell it to visit our website with the `cy.visit()` command.
-    // Since we want to visit the same URL at the start of all our tests,
-    // we include it in our beforeEach function so that it runs before each test
-    cy.visit('https://example.cypress.io/todo')
-  })
-
-  it('displays two todo items by default', () => {
-    // We use the `cy.get()` command to get all elements that match the selector.
-    // Then, we use `should` to assert that there are two matched items,
-    // which are the two default items.
-    cy.get('.todo-list li').should('have.length', 2)
-
-    // We can go even further and check that the default todos each contain
-    // the correct text. We use the `first` and `last` functions
-    // to get just the first and last matched elements individually,
-    // and then perform an assertion with `should`.
-    cy.get('.todo-list li').first().should('have.text', 'Pay electric bill')
-    cy.get('.todo-list li').last().should('have.text', 'Walk the dog')
-  })
-
-  it('can add new todo items', () => {
-    // We'll store our item text in a variable so we can reuse it
-    const newItem = 'Feed the cat'
-
-    // Let's get the input element and use the `type` command to
-    // input our new list item. After typing the content of our item,
-    // we need to type the enter key as well in order to submit the input.
-    // This input has a data-test attribute so we'll use that to select the
-    // element in accordance with best practices:
-    // https://on.cypress.io/selecting-elements
-    cy.get('[data-test=new-todo]').type(`${newItem}{enter}`)
-
-    // Now that we've typed our new item, let's check that it actually was added to the list.
-    // Since it's the newest item, it should exist as the last element in the list.
-    // In addition, with the two default items, we should have a total of 3 elements in the list.
-    // Since assertions yield the element that was asserted on,
-    // we can chain both of these assertions together into a single statement.
-    cy.get('.todo-list li')
-      .should('have.length', 3)
-      .last()
-      .should('have.text', newItem)
-  })
-
-  it('can check off an item as completed', () => {
-    // In addition to using the `get` command to get an element by selector,
-    // we can also use the `contains` command to get an element by its contents.
-    // However, this will yield the <label>, which is lowest-level element that contains the text.
-    // In order to check the item, we'll find the <input> element for this <label>
-    // by traversing up the dom to the parent element. From there, we can `find`
-    // the child checkbox <input> element and use the `check` command to check it.
-    cy.contains('Pay electric bill')
-      .parent()
-      .find('input[type=checkbox]')
-      .check()
-
-    // Now that we've checked the button, we can go ahead and make sure
-    // that the list element is now marked as completed.
-    // Again we'll use `contains` to find the <label> element and then use the `parents` command
-    // to traverse multiple levels up the dom until we find the corresponding <li> element.
-    // Once we get that element, we can assert that it has the completed class.
-    cy.contains('Pay electric bill')
-      .parents('li')
-      .should('have.class', 'completed')
-  })
-
-  context('with a checked task', () => {
-    beforeEach(() => {
-      // We'll take the command we used above to check off an element
-      // Since we want to perform multiple tests that start with checking
-      // one element, we put it in the beforeEach hook
-      // so that it runs at the start of every test.
-      cy.contains('Pay electric bill')
-        .parent()
-        .find('input[type=checkbox]')
-        .check()
-    })
-
-    it('can filter for uncompleted tasks', () => {
-      // We'll click on the "active" button in order to
-      // display only incomplete items
-      cy.contains('Active').click()
-
-      // After filtering, we can assert that there is only the one
-      // incomplete item in the list.
-      cy.get('.todo-list li')
-        .should('have.length', 1)
-        .first()
-        .should('have.text', 'Walk the dog')
-
-      // For good measure, let's also assert that the task we checked off
-      // does not exist on the page.
-      cy.contains('Pay electric bill').should('not.exist')
-    })
-
-    it('can filter for completed tasks', () => {
-      // We can perform similar steps as the test above to ensure
-      // that only completed tasks are shown
-      cy.contains('Completed').click()
-
-      cy.get('.todo-list li')
-        .should('have.length', 1)
-        .first()
-        .should('have.text', 'Pay electric bill')
-
-      cy.contains('Walk the dog').should('not.exist')
-    })
-
-    it('can delete all completed tasks', () => {
-      // First, let's click the "Clear completed" button
-      // `contains` is actually serving two purposes here.
-      // First, it's ensuring that the button exists within the dom.
-      // This button only appears when at least one task is checked
-      // so this command is implicitly verifying that it does exist.
-      // Second, it selects the button so we can click it.
-      cy.contains('Clear completed').click()
-
-      // Then we can make sure that there is only one element
-      // in the list and our element does not exist
-      cy.get('.todo-list li')
-        .should('have.length', 1)
-        .should('not.have.text', 'Pay electric bill')
-
-      // Finally, make sure that the clear button no longer exists.
-      cy.contains('Clear completed').should('not.exist')
-    })
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/actions.spec.js b/client/cypress/integration/2-advanced-examples/actions.spec.js
deleted file mode 100644
index 092637998..000000000
--- a/client/cypress/integration/2-advanced-examples/actions.spec.js
+++ /dev/null
@@ -1,299 +0,0 @@
-/// <reference types="cypress" />
-
-context('Actions', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/actions')
-  })
-
-  // https://on.cypress.io/interacting-with-elements
-
-  it('.type() - type into a DOM element', () => {
-    // https://on.cypress.io/type
-    cy.get('.action-email')
-      .type('fake@email.com').should('have.value', 'fake@email.com')
-
-      // .type() with special character sequences
-      .type('{leftarrow}{rightarrow}{uparrow}{downarrow}')
-      .type('{del}{selectall}{backspace}')
-
-      // .type() with key modifiers
-      .type('{alt}{option}') //these are equivalent
-      .type('{ctrl}{control}') //these are equivalent
-      .type('{meta}{command}{cmd}') //these are equivalent
-      .type('{shift}')
-
-      // Delay each keypress by 0.1 sec
-      .type('slow.typing@email.com', { delay: 100 })
-      .should('have.value', 'slow.typing@email.com')
-
-    cy.get('.action-disabled')
-      // Ignore error checking prior to type
-      // like whether the input is visible or disabled
-      .type('disabled error checking', { force: true })
-      .should('have.value', 'disabled error checking')
-  })
-
-  it('.focus() - focus on a DOM element', () => {
-    // https://on.cypress.io/focus
-    cy.get('.action-focus').focus()
-      .should('have.class', 'focus')
-      .prev().should('have.attr', 'style', 'color: orange;')
-  })
-
-  it('.blur() - blur off a DOM element', () => {
-    // https://on.cypress.io/blur
-    cy.get('.action-blur').type('About to blur').blur()
-      .should('have.class', 'error')
-      .prev().should('have.attr', 'style', 'color: red;')
-  })
-
-  it('.clear() - clears an input or textarea element', () => {
-    // https://on.cypress.io/clear
-    cy.get('.action-clear').type('Clear this text')
-      .should('have.value', 'Clear this text')
-      .clear()
-      .should('have.value', '')
-  })
-
-  it('.submit() - submit a form', () => {
-    // https://on.cypress.io/submit
-    cy.get('.action-form')
-      .find('[type="text"]').type('HALFOFF')
-
-    cy.get('.action-form').submit()
-      .next().should('contain', 'Your form has been submitted!')
-  })
-
-  it('.click() - click on a DOM element', () => {
-    // https://on.cypress.io/click
-    cy.get('.action-btn').click()
-
-    // You can click on 9 specific positions of an element:
-    //  -----------------------------------
-    // | topLeft        top       topRight |
-    // |                                   |
-    // |                                   |
-    // |                                   |
-    // | left          center        right |
-    // |                                   |
-    // |                                   |
-    // |                                   |
-    // | bottomLeft   bottom   bottomRight |
-    //  -----------------------------------
-
-    // clicking in the center of the element is the default
-    cy.get('#action-canvas').click()
-
-    cy.get('#action-canvas').click('topLeft')
-    cy.get('#action-canvas').click('top')
-    cy.get('#action-canvas').click('topRight')
-    cy.get('#action-canvas').click('left')
-    cy.get('#action-canvas').click('right')
-    cy.get('#action-canvas').click('bottomLeft')
-    cy.get('#action-canvas').click('bottom')
-    cy.get('#action-canvas').click('bottomRight')
-
-    // .click() accepts an x and y coordinate
-    // that controls where the click occurs :)
-
-    cy.get('#action-canvas')
-      .click(80, 75) // click 80px on x coord and 75px on y coord
-      .click(170, 75)
-      .click(80, 165)
-      .click(100, 185)
-      .click(125, 190)
-      .click(150, 185)
-      .click(170, 165)
-
-    // click multiple elements by passing multiple: true
-    cy.get('.action-labels>.label').click({ multiple: true })
-
-    // Ignore error checking prior to clicking
-    cy.get('.action-opacity>.btn').click({ force: true })
-  })
-
-  it('.dblclick() - double click on a DOM element', () => {
-    // https://on.cypress.io/dblclick
-
-    // Our app has a listener on 'dblclick' event in our 'scripts.js'
-    // that hides the div and shows an input on double click
-    cy.get('.action-div').dblclick().should('not.be.visible')
-    cy.get('.action-input-hidden').should('be.visible')
-  })
-
-  it('.rightclick() - right click on a DOM element', () => {
-    // https://on.cypress.io/rightclick
-
-    // Our app has a listener on 'contextmenu' event in our 'scripts.js'
-    // that hides the div and shows an input on right click
-    cy.get('.rightclick-action-div').rightclick().should('not.be.visible')
-    cy.get('.rightclick-action-input-hidden').should('be.visible')
-  })
-
-  it('.check() - check a checkbox or radio element', () => {
-    // https://on.cypress.io/check
-
-    // By default, .check() will check all
-    // matching checkbox or radio elements in succession, one after another
-    cy.get('.action-checkboxes [type="checkbox"]').not('[disabled]')
-      .check().should('be.checked')
-
-    cy.get('.action-radios [type="radio"]').not('[disabled]')
-      .check().should('be.checked')
-
-    // .check() accepts a value argument
-    cy.get('.action-radios [type="radio"]')
-      .check('radio1').should('be.checked')
-
-    // .check() accepts an array of values
-    cy.get('.action-multiple-checkboxes [type="checkbox"]')
-      .check(['checkbox1', 'checkbox2']).should('be.checked')
-
-    // Ignore error checking prior to checking
-    cy.get('.action-checkboxes [disabled]')
-      .check({ force: true }).should('be.checked')
-
-    cy.get('.action-radios [type="radio"]')
-      .check('radio3', { force: true }).should('be.checked')
-  })
-
-  it('.uncheck() - uncheck a checkbox element', () => {
-    // https://on.cypress.io/uncheck
-
-    // By default, .uncheck() will uncheck all matching
-    // checkbox elements in succession, one after another
-    cy.get('.action-check [type="checkbox"]')
-      .not('[disabled]')
-      .uncheck().should('not.be.checked')
-
-    // .uncheck() accepts a value argument
-    cy.get('.action-check [type="checkbox"]')
-      .check('checkbox1')
-      .uncheck('checkbox1').should('not.be.checked')
-
-    // .uncheck() accepts an array of values
-    cy.get('.action-check [type="checkbox"]')
-      .check(['checkbox1', 'checkbox3'])
-      .uncheck(['checkbox1', 'checkbox3']).should('not.be.checked')
-
-    // Ignore error checking prior to unchecking
-    cy.get('.action-check [disabled]')
-      .uncheck({ force: true }).should('not.be.checked')
-  })
-
-  it('.select() - select an option in a <select> element', () => {
-    // https://on.cypress.io/select
-
-    // at first, no option should be selected
-    cy.get('.action-select')
-      .should('have.value', '--Select a fruit--')
-
-    // Select option(s) with matching text content
-    cy.get('.action-select').select('apples')
-    // confirm the apples were selected
-    // note that each value starts with "fr-" in our HTML
-    cy.get('.action-select').should('have.value', 'fr-apples')
-
-    cy.get('.action-select-multiple')
-      .select(['apples', 'oranges', 'bananas'])
-      // when getting multiple values, invoke "val" method first
-      .invoke('val')
-      .should('deep.equal', ['fr-apples', 'fr-oranges', 'fr-bananas'])
-
-    // Select option(s) with matching value
-    cy.get('.action-select').select('fr-bananas')
-      // can attach an assertion right away to the element
-      .should('have.value', 'fr-bananas')
-
-    cy.get('.action-select-multiple')
-      .select(['fr-apples', 'fr-oranges', 'fr-bananas'])
-      .invoke('val')
-      .should('deep.equal', ['fr-apples', 'fr-oranges', 'fr-bananas'])
-
-    // assert the selected values include oranges
-    cy.get('.action-select-multiple')
-      .invoke('val').should('include', 'fr-oranges')
-  })
-
-  it('.scrollIntoView() - scroll an element into view', () => {
-    // https://on.cypress.io/scrollintoview
-
-    // normally all of these buttons are hidden,
-    // because they're not within
-    // the viewable area of their parent
-    // (we need to scroll to see them)
-    cy.get('#scroll-horizontal button')
-      .should('not.be.visible')
-
-    // scroll the button into view, as if the user had scrolled
-    cy.get('#scroll-horizontal button').scrollIntoView()
-      .should('be.visible')
-
-    cy.get('#scroll-vertical button')
-      .should('not.be.visible')
-
-    // Cypress handles the scroll direction needed
-    cy.get('#scroll-vertical button').scrollIntoView()
-      .should('be.visible')
-
-    cy.get('#scroll-both button')
-      .should('not.be.visible')
-
-    // Cypress knows to scroll to the right and down
-    cy.get('#scroll-both button').scrollIntoView()
-      .should('be.visible')
-  })
-
-  it('.trigger() - trigger an event on a DOM element', () => {
-    // https://on.cypress.io/trigger
-
-    // To interact with a range input (slider)
-    // we need to set its value & trigger the
-    // event to signal it changed
-
-    // Here, we invoke jQuery's val() method to set
-    // the value and trigger the 'change' event
-    cy.get('.trigger-input-range')
-      .invoke('val', 25)
-      .trigger('change')
-      .get('input[type=range]').siblings('p')
-      .should('have.text', '25')
-  })
-
-  it('cy.scrollTo() - scroll the window or element to a position', () => {
-    // https://on.cypress.io/scrollto
-
-    // You can scroll to 9 specific positions of an element:
-    //  -----------------------------------
-    // | topLeft        top       topRight |
-    // |                                   |
-    // |                                   |
-    // |                                   |
-    // | left          center        right |
-    // |                                   |
-    // |                                   |
-    // |                                   |
-    // | bottomLeft   bottom   bottomRight |
-    //  -----------------------------------
-
-    // if you chain .scrollTo() off of cy, we will
-    // scroll the entire window
-    cy.scrollTo('bottom')
-
-    cy.get('#scrollable-horizontal').scrollTo('right')
-
-    // or you can scroll to a specific coordinate:
-    // (x axis, y axis) in pixels
-    cy.get('#scrollable-vertical').scrollTo(250, 250)
-
-    // or you can scroll to a specific percentage
-    // of the (width, height) of the element
-    cy.get('#scrollable-both').scrollTo('75%', '25%')
-
-    // control the easing of the scroll (default is 'swing')
-    cy.get('#scrollable-vertical').scrollTo('center', { easing: 'linear' })
-
-    // control the duration of the scroll (in ms)
-    cy.get('#scrollable-both').scrollTo('center', { duration: 2000 })
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/aliasing.spec.js b/client/cypress/integration/2-advanced-examples/aliasing.spec.js
deleted file mode 100644
index a02fb2bb9..000000000
--- a/client/cypress/integration/2-advanced-examples/aliasing.spec.js
+++ /dev/null
@@ -1,39 +0,0 @@
-/// <reference types="cypress" />
-
-context('Aliasing', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/aliasing')
-  })
-
-  it('.as() - alias a DOM element for later use', () => {
-    // https://on.cypress.io/as
-
-    // Alias a DOM element for use later
-    // We don't have to traverse to the element
-    // later in our code, we reference it with @
-
-    cy.get('.as-table').find('tbody>tr')
-      .first().find('td').first()
-      .find('button').as('firstBtn')
-
-    // when we reference the alias, we place an
-    // @ in front of its name
-    cy.get('@firstBtn').click()
-
-    cy.get('@firstBtn')
-      .should('have.class', 'btn-success')
-      .and('contain', 'Changed')
-  })
-
-  it('.as() - alias a route for later use', () => {
-    // Alias the route to wait for its response
-    cy.intercept('GET', '**/comments/*').as('getComment')
-
-    // we have code that gets a comment when
-    // the button is clicked in scripts.js
-    cy.get('.network-btn').click()
-
-    // https://on.cypress.io/wait
-    cy.wait('@getComment').its('response.statusCode').should('eq', 200)
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/assertions.spec.js b/client/cypress/integration/2-advanced-examples/assertions.spec.js
deleted file mode 100644
index 5ba93d1db..000000000
--- a/client/cypress/integration/2-advanced-examples/assertions.spec.js
+++ /dev/null
@@ -1,177 +0,0 @@
-/// <reference types="cypress" />
-
-context('Assertions', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/assertions')
-  })
-
-  describe('Implicit Assertions', () => {
-    it('.should() - make an assertion about the current subject', () => {
-      // https://on.cypress.io/should
-      cy.get('.assertion-table')
-        .find('tbody tr:last')
-        .should('have.class', 'success')
-        .find('td')
-        .first()
-        // checking the text of the <td> element in various ways
-        .should('have.text', 'Column content')
-        .should('contain', 'Column content')
-        .should('have.html', 'Column content')
-        // chai-jquery uses "is()" to check if element matches selector
-        .should('match', 'td')
-        // to match text content against a regular expression
-        // first need to invoke jQuery method text()
-        // and then match using regular expression
-        .invoke('text')
-        .should('match', /column content/i)
-
-      // a better way to check element's text content against a regular expression
-      // is to use "cy.contains"
-      // https://on.cypress.io/contains
-      cy.get('.assertion-table')
-        .find('tbody tr:last')
-        // finds first <td> element with text content matching regular expression
-        .contains('td', /column content/i)
-        .should('be.visible')
-
-      // for more information about asserting element's text
-      // see https://on.cypress.io/using-cypress-faq#How-do-I-get-an-element’s-text-contents
-    })
-
-    it('.and() - chain multiple assertions together', () => {
-      // https://on.cypress.io/and
-      cy.get('.assertions-link')
-        .should('have.class', 'active')
-        .and('have.attr', 'href')
-        .and('include', 'cypress.io')
-    })
-  })
-
-  describe('Explicit Assertions', () => {
-    // https://on.cypress.io/assertions
-    it('expect - make an assertion about a specified subject', () => {
-      // We can use Chai's BDD style assertions
-      expect(true).to.be.true
-      const o = { foo: 'bar' }
-
-      expect(o).to.equal(o)
-      expect(o).to.deep.equal({ foo: 'bar' })
-      // matching text using regular expression
-      expect('FooBar').to.match(/bar$/i)
-    })
-
-    it('pass your own callback function to should()', () => {
-      // Pass a function to should that can have any number
-      // of explicit assertions within it.
-      // The ".should(cb)" function will be retried
-      // automatically until it passes all your explicit assertions or times out.
-      cy.get('.assertions-p')
-        .find('p')
-        .should(($p) => {
-          // https://on.cypress.io/$
-          // return an array of texts from all of the p's
-          // @ts-ignore TS6133 unused variable
-          const texts = $p.map((i, el) => Cypress.$(el).text())
-
-          // jquery map returns jquery object
-          // and .get() convert this to simple array
-          const paragraphs = texts.get()
-
-          // array should have length of 3
-          expect(paragraphs, 'has 3 paragraphs').to.have.length(3)
-
-          // use second argument to expect(...) to provide clear
-          // message with each assertion
-          expect(paragraphs, 'has expected text in each paragraph').to.deep.eq([
-            'Some text from first p',
-            'More text from second p',
-            'And even more text from third p',
-          ])
-        })
-    })
-
-    it('finds element by class name regex', () => {
-      cy.get('.docs-header')
-        .find('div')
-        // .should(cb) callback function will be retried
-        .should(($div) => {
-          expect($div).to.have.length(1)
-
-          const className = $div[0].className
-
-          expect(className).to.match(/heading-/)
-        })
-        // .then(cb) callback is not retried,
-        // it either passes or fails
-        .then(($div) => {
-          expect($div, 'text content').to.have.text('Introduction')
-        })
-    })
-
-    it('can throw any error', () => {
-      cy.get('.docs-header')
-        .find('div')
-        .should(($div) => {
-          if ($div.length !== 1) {
-            // you can throw your own errors
-            throw new Error('Did not find 1 element')
-          }
-
-          const className = $div[0].className
-
-          if (!className.match(/heading-/)) {
-            throw new Error(`Could not find class "heading-" in ${className}`)
-          }
-        })
-    })
-
-    it('matches unknown text between two elements', () => {
-      /**
-       * Text from the first element.
-       * @type {string}
-      */
-      let text
-
-      /**
-       * Normalizes passed text,
-       * useful before comparing text with spaces and different capitalization.
-       * @param {string} s Text to normalize
-      */
-      const normalizeText = (s) => s.replace(/\s/g, '').toLowerCase()
-
-      cy.get('.two-elements')
-        .find('.first')
-        .then(($first) => {
-          // save text from the first element
-          text = normalizeText($first.text())
-        })
-
-      cy.get('.two-elements')
-        .find('.second')
-        .should(($div) => {
-          // we can massage text before comparing
-          const secondText = normalizeText($div.text())
-
-          expect(secondText, 'second text').to.equal(text)
-        })
-    })
-
-    it('assert - assert shape of an object', () => {
-      const person = {
-        name: 'Joe',
-        age: 20,
-      }
-
-      assert.isObject(person, 'value is object')
-    })
-
-    it('retries the should callback until assertions pass', () => {
-      cy.get('#random-number')
-        .should(($div) => {
-          const n = parseFloat($div.text())
-
-          expect(n).to.be.gte(1).and.be.lte(10)
-        })
-    })
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/connectors.spec.js b/client/cypress/integration/2-advanced-examples/connectors.spec.js
deleted file mode 100644
index ae8799181..000000000
--- a/client/cypress/integration/2-advanced-examples/connectors.spec.js
+++ /dev/null
@@ -1,97 +0,0 @@
-/// <reference types="cypress" />
-
-context('Connectors', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/connectors')
-  })
-
-  it('.each() - iterate over an array of elements', () => {
-    // https://on.cypress.io/each
-    cy.get('.connectors-each-ul>li')
-      .each(($el, index, $list) => {
-        console.log($el, index, $list)
-      })
-  })
-
-  it('.its() - get properties on the current subject', () => {
-    // https://on.cypress.io/its
-    cy.get('.connectors-its-ul>li')
-      // calls the 'length' property yielding that value
-      .its('length')
-      .should('be.gt', 2)
-  })
-
-  it('.invoke() - invoke a function on the current subject', () => {
-    // our div is hidden in our script.js
-    // $('.connectors-div').hide()
-
-    // https://on.cypress.io/invoke
-    cy.get('.connectors-div').should('be.hidden')
-      // call the jquery method 'show' on the 'div.container'
-      .invoke('show')
-      .should('be.visible')
-  })
-
-  it('.spread() - spread an array as individual args to callback function', () => {
-    // https://on.cypress.io/spread
-    const arr = ['foo', 'bar', 'baz']
-
-    cy.wrap(arr).spread((foo, bar, baz) => {
-      expect(foo).to.eq('foo')
-      expect(bar).to.eq('bar')
-      expect(baz).to.eq('baz')
-    })
-  })
-
-  describe('.then()', () => {
-    it('invokes a callback function with the current subject', () => {
-      // https://on.cypress.io/then
-      cy.get('.connectors-list > li')
-        .then(($lis) => {
-          expect($lis, '3 items').to.have.length(3)
-          expect($lis.eq(0), 'first item').to.contain('Walk the dog')
-          expect($lis.eq(1), 'second item').to.contain('Feed the cat')
-          expect($lis.eq(2), 'third item').to.contain('Write JavaScript')
-        })
-    })
-
-    it('yields the returned value to the next command', () => {
-      cy.wrap(1)
-        .then((num) => {
-          expect(num).to.equal(1)
-
-          return 2
-        })
-        .then((num) => {
-          expect(num).to.equal(2)
-        })
-    })
-
-    it('yields the original subject without return', () => {
-      cy.wrap(1)
-        .then((num) => {
-          expect(num).to.equal(1)
-          // note that nothing is returned from this callback
-        })
-        .then((num) => {
-          // this callback receives the original unchanged value 1
-          expect(num).to.equal(1)
-        })
-    })
-
-    it('yields the value yielded by the last Cypress command inside', () => {
-      cy.wrap(1)
-        .then((num) => {
-          expect(num).to.equal(1)
-          // note how we run a Cypress command
-          // the result yielded by this Cypress command
-          // will be passed to the second ".then"
-          cy.wrap(2)
-        })
-        .then((num) => {
-          // this callback receives the value yielded by "cy.wrap(2)"
-          expect(num).to.equal(2)
-        })
-    })
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/cookies.spec.js b/client/cypress/integration/2-advanced-examples/cookies.spec.js
deleted file mode 100644
index 31587ff90..000000000
--- a/client/cypress/integration/2-advanced-examples/cookies.spec.js
+++ /dev/null
@@ -1,77 +0,0 @@
-/// <reference types="cypress" />
-
-context('Cookies', () => {
-  beforeEach(() => {
-    Cypress.Cookies.debug(true)
-
-    cy.visit('https://example.cypress.io/commands/cookies')
-
-    // clear cookies again after visiting to remove
-    // any 3rd party cookies picked up such as cloudflare
-    cy.clearCookies()
-  })
-
-  it('cy.getCookie() - get a browser cookie', () => {
-    // https://on.cypress.io/getcookie
-    cy.get('#getCookie .set-a-cookie').click()
-
-    // cy.getCookie() yields a cookie object
-    cy.getCookie('token').should('have.property', 'value', '123ABC')
-  })
-
-  it('cy.getCookies() - get browser cookies', () => {
-    // https://on.cypress.io/getcookies
-    cy.getCookies().should('be.empty')
-
-    cy.get('#getCookies .set-a-cookie').click()
-
-    // cy.getCookies() yields an array of cookies
-    cy.getCookies().should('have.length', 1).should((cookies) => {
-      // each cookie has these properties
-      expect(cookies[0]).to.have.property('name', 'token')
-      expect(cookies[0]).to.have.property('value', '123ABC')
-      expect(cookies[0]).to.have.property('httpOnly', false)
-      expect(cookies[0]).to.have.property('secure', false)
-      expect(cookies[0]).to.have.property('domain')
-      expect(cookies[0]).to.have.property('path')
-    })
-  })
-
-  it('cy.setCookie() - set a browser cookie', () => {
-    // https://on.cypress.io/setcookie
-    cy.getCookies().should('be.empty')
-
-    cy.setCookie('foo', 'bar')
-
-    // cy.getCookie() yields a cookie object
-    cy.getCookie('foo').should('have.property', 'value', 'bar')
-  })
-
-  it('cy.clearCookie() - clear a browser cookie', () => {
-    // https://on.cypress.io/clearcookie
-    cy.getCookie('token').should('be.null')
-
-    cy.get('#clearCookie .set-a-cookie').click()
-
-    cy.getCookie('token').should('have.property', 'value', '123ABC')
-
-    // cy.clearCookies() yields null
-    cy.clearCookie('token').should('be.null')
-
-    cy.getCookie('token').should('be.null')
-  })
-
-  it('cy.clearCookies() - clear browser cookies', () => {
-    // https://on.cypress.io/clearcookies
-    cy.getCookies().should('be.empty')
-
-    cy.get('#clearCookies .set-a-cookie').click()
-
-    cy.getCookies().should('have.length', 1)
-
-    // cy.clearCookies() yields null
-    cy.clearCookies()
-
-    cy.getCookies().should('be.empty')
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/cypress_api.spec.js b/client/cypress/integration/2-advanced-examples/cypress_api.spec.js
deleted file mode 100644
index ec8ceaeda..000000000
--- a/client/cypress/integration/2-advanced-examples/cypress_api.spec.js
+++ /dev/null
@@ -1,202 +0,0 @@
-/// <reference types="cypress" />
-
-context('Cypress.Commands', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/cypress-api')
-  })
-
-  // https://on.cypress.io/custom-commands
-
-  it('.add() - create a custom command', () => {
-    Cypress.Commands.add('console', {
-      prevSubject: true,
-    }, (subject, method) => {
-      // the previous subject is automatically received
-      // and the commands arguments are shifted
-
-      // allow us to change the console method used
-      method = method || 'log'
-
-      // log the subject to the console
-      // @ts-ignore TS7017
-      console[method]('The subject is', subject)
-
-      // whatever we return becomes the new subject
-      // we don't want to change the subject so
-      // we return whatever was passed in
-      return subject
-    })
-
-    // @ts-ignore TS2339
-    cy.get('button').console('info').then(($button) => {
-      // subject is still $button
-    })
-  })
-})
-
-context('Cypress.Cookies', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/cypress-api')
-  })
-
-  // https://on.cypress.io/cookies
-  it('.debug() - enable or disable debugging', () => {
-    Cypress.Cookies.debug(true)
-
-    // Cypress will now log in the console when
-    // cookies are set or cleared
-    cy.setCookie('fakeCookie', '123ABC')
-    cy.clearCookie('fakeCookie')
-    cy.setCookie('fakeCookie', '123ABC')
-    cy.clearCookie('fakeCookie')
-    cy.setCookie('fakeCookie', '123ABC')
-  })
-
-  it('.preserveOnce() - preserve cookies by key', () => {
-    // normally cookies are reset after each test
-    cy.getCookie('fakeCookie').should('not.be.ok')
-
-    // preserving a cookie will not clear it when
-    // the next test starts
-    cy.setCookie('lastCookie', '789XYZ')
-    Cypress.Cookies.preserveOnce('lastCookie')
-  })
-
-  it('.defaults() - set defaults for all cookies', () => {
-    // now any cookie with the name 'session_id' will
-    // not be cleared before each new test runs
-    Cypress.Cookies.defaults({
-      preserve: 'session_id',
-    })
-  })
-})
-
-context('Cypress.arch', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/cypress-api')
-  })
-
-  it('Get CPU architecture name of underlying OS', () => {
-    // https://on.cypress.io/arch
-    expect(Cypress.arch).to.exist
-  })
-})
-
-context('Cypress.config()', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/cypress-api')
-  })
-
-  it('Get and set configuration options', () => {
-    // https://on.cypress.io/config
-    let myConfig = Cypress.config()
-
-    expect(myConfig).to.have.property('animationDistanceThreshold', 5)
-    expect(myConfig).to.have.property('baseUrl', null)
-    expect(myConfig).to.have.property('defaultCommandTimeout', 4000)
-    expect(myConfig).to.have.property('requestTimeout', 5000)
-    expect(myConfig).to.have.property('responseTimeout', 30000)
-    expect(myConfig).to.have.property('viewportHeight', 660)
-    expect(myConfig).to.have.property('viewportWidth', 1000)
-    expect(myConfig).to.have.property('pageLoadTimeout', 60000)
-    expect(myConfig).to.have.property('waitForAnimations', true)
-
-    expect(Cypress.config('pageLoadTimeout')).to.eq(60000)
-
-    // this will change the config for the rest of your tests!
-    Cypress.config('pageLoadTimeout', 20000)
-
-    expect(Cypress.config('pageLoadTimeout')).to.eq(20000)
-
-    Cypress.config('pageLoadTimeout', 60000)
-  })
-})
-
-context('Cypress.dom', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/cypress-api')
-  })
-
-  // https://on.cypress.io/dom
-  it('.isHidden() - determine if a DOM element is hidden', () => {
-    let hiddenP = Cypress.$('.dom-p p.hidden').get(0)
-    let visibleP = Cypress.$('.dom-p p.visible').get(0)
-
-    // our first paragraph has css class 'hidden'
-    expect(Cypress.dom.isHidden(hiddenP)).to.be.true
-    expect(Cypress.dom.isHidden(visibleP)).to.be.false
-  })
-})
-
-context('Cypress.env()', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/cypress-api')
-  })
-
-  // We can set environment variables for highly dynamic values
-
-  // https://on.cypress.io/environment-variables
-  it('Get environment variables', () => {
-    // https://on.cypress.io/env
-    // set multiple environment variables
-    Cypress.env({
-      host: 'veronica.dev.local',
-      api_server: 'http://localhost:8888/v1/',
-    })
-
-    // get environment variable
-    expect(Cypress.env('host')).to.eq('veronica.dev.local')
-
-    // set environment variable
-    Cypress.env('api_server', 'http://localhost:8888/v2/')
-    expect(Cypress.env('api_server')).to.eq('http://localhost:8888/v2/')
-
-    // get all environment variable
-    expect(Cypress.env()).to.have.property('host', 'veronica.dev.local')
-    expect(Cypress.env()).to.have.property('api_server', 'http://localhost:8888/v2/')
-  })
-})
-
-context('Cypress.log', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/cypress-api')
-  })
-
-  it('Control what is printed to the Command Log', () => {
-    // https://on.cypress.io/cypress-log
-  })
-})
-
-context('Cypress.platform', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/cypress-api')
-  })
-
-  it('Get underlying OS name', () => {
-    // https://on.cypress.io/platform
-    expect(Cypress.platform).to.be.exist
-  })
-})
-
-context('Cypress.version', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/cypress-api')
-  })
-
-  it('Get current version of Cypress being run', () => {
-    // https://on.cypress.io/version
-    expect(Cypress.version).to.be.exist
-  })
-})
-
-context('Cypress.spec', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/cypress-api')
-  })
-
-  it('Get current spec information', () => {
-    // https://on.cypress.io/spec
-    // wrap the object so we can inspect it easily by clicking in the command log
-    cy.wrap(Cypress.spec).should('include.keys', ['name', 'relative', 'absolute'])
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/files.spec.js b/client/cypress/integration/2-advanced-examples/files.spec.js
deleted file mode 100644
index b8273430c..000000000
--- a/client/cypress/integration/2-advanced-examples/files.spec.js
+++ /dev/null
@@ -1,88 +0,0 @@
-/// <reference types="cypress" />
-
-/// JSON fixture file can be loaded directly using
-// the built-in JavaScript bundler
-// @ts-ignore
-const requiredExample = require('../../fixtures/example')
-
-context('Files', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/files')
-  })
-
-  beforeEach(() => {
-    // load example.json fixture file and store
-    // in the test context object
-    cy.fixture('example.json').as('example')
-  })
-
-  it('cy.fixture() - load a fixture', () => {
-    // https://on.cypress.io/fixture
-
-    // Instead of writing a response inline you can
-    // use a fixture file's content.
-
-    // when application makes an Ajax request matching "GET **/comments/*"
-    // Cypress will intercept it and reply with the object in `example.json` fixture
-    cy.intercept('GET', '**/comments/*', { fixture: 'example.json' }).as('getComment')
-
-    // we have code that gets a comment when
-    // the button is clicked in scripts.js
-    cy.get('.fixture-btn').click()
-
-    cy.wait('@getComment').its('response.body')
-      .should('have.property', 'name')
-      .and('include', 'Using fixtures to represent data')
-  })
-
-  it('cy.fixture() or require - load a fixture', function () {
-    // we are inside the "function () { ... }"
-    // callback and can use test context object "this"
-    // "this.example" was loaded in "beforeEach" function callback
-    expect(this.example, 'fixture in the test context')
-      .to.deep.equal(requiredExample)
-
-    // or use "cy.wrap" and "should('deep.equal', ...)" assertion
-    cy.wrap(this.example)
-      .should('deep.equal', requiredExample)
-  })
-
-  it('cy.readFile() - read file contents', () => {
-    // https://on.cypress.io/readfile
-
-    // You can read a file and yield its contents
-    // The filePath is relative to your project's root.
-    cy.readFile('cypress.json').then((json) => {
-      expect(json).to.be.an('object')
-    })
-  })
-
-  it('cy.writeFile() - write to a file', () => {
-    // https://on.cypress.io/writefile
-
-    // You can write to a file
-
-    // Use a response from a request to automatically
-    // generate a fixture file for use later
-    cy.request('https://jsonplaceholder.cypress.io/users')
-      .then((response) => {
-        cy.writeFile('cypress/fixtures/users.json', response.body)
-      })
-
-    cy.fixture('users').should((users) => {
-      expect(users[0].name).to.exist
-    })
-
-    // JavaScript arrays and objects are stringified
-    // and formatted into text.
-    cy.writeFile('cypress/fixtures/profile.json', {
-      id: 8739,
-      name: 'Jane',
-      email: 'jane@example.com',
-    })
-
-    cy.fixture('profile').should((profile) => {
-      expect(profile.name).to.eq('Jane')
-    })
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/local_storage.spec.js b/client/cypress/integration/2-advanced-examples/local_storage.spec.js
deleted file mode 100644
index 534d8bd9d..000000000
--- a/client/cypress/integration/2-advanced-examples/local_storage.spec.js
+++ /dev/null
@@ -1,52 +0,0 @@
-/// <reference types="cypress" />
-
-context('Local Storage', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/local-storage')
-  })
-  // Although local storage is automatically cleared
-  // in between tests to maintain a clean state
-  // sometimes we need to clear the local storage manually
-
-  it('cy.clearLocalStorage() - clear all data in local storage', () => {
-    // https://on.cypress.io/clearlocalstorage
-    cy.get('.ls-btn').click().should(() => {
-      expect(localStorage.getItem('prop1')).to.eq('red')
-      expect(localStorage.getItem('prop2')).to.eq('blue')
-      expect(localStorage.getItem('prop3')).to.eq('magenta')
-    })
-
-    // clearLocalStorage() yields the localStorage object
-    cy.clearLocalStorage().should((ls) => {
-      expect(ls.getItem('prop1')).to.be.null
-      expect(ls.getItem('prop2')).to.be.null
-      expect(ls.getItem('prop3')).to.be.null
-    })
-
-    cy.get('.ls-btn').click().should(() => {
-      expect(localStorage.getItem('prop1')).to.eq('red')
-      expect(localStorage.getItem('prop2')).to.eq('blue')
-      expect(localStorage.getItem('prop3')).to.eq('magenta')
-    })
-
-    // Clear key matching string in Local Storage
-    cy.clearLocalStorage('prop1').should((ls) => {
-      expect(ls.getItem('prop1')).to.be.null
-      expect(ls.getItem('prop2')).to.eq('blue')
-      expect(ls.getItem('prop3')).to.eq('magenta')
-    })
-
-    cy.get('.ls-btn').click().should(() => {
-      expect(localStorage.getItem('prop1')).to.eq('red')
-      expect(localStorage.getItem('prop2')).to.eq('blue')
-      expect(localStorage.getItem('prop3')).to.eq('magenta')
-    })
-
-    // Clear keys matching regex in Local Storage
-    cy.clearLocalStorage(/prop1|2/).should((ls) => {
-      expect(ls.getItem('prop1')).to.be.null
-      expect(ls.getItem('prop2')).to.be.null
-      expect(ls.getItem('prop3')).to.eq('magenta')
-    })
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/location.spec.js b/client/cypress/integration/2-advanced-examples/location.spec.js
deleted file mode 100644
index 299867da0..000000000
--- a/client/cypress/integration/2-advanced-examples/location.spec.js
+++ /dev/null
@@ -1,32 +0,0 @@
-/// <reference types="cypress" />
-
-context('Location', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/location')
-  })
-
-  it('cy.hash() - get the current URL hash', () => {
-    // https://on.cypress.io/hash
-    cy.hash().should('be.empty')
-  })
-
-  it('cy.location() - get window.location', () => {
-    // https://on.cypress.io/location
-    cy.location().should((location) => {
-      expect(location.hash).to.be.empty
-      expect(location.href).to.eq('https://example.cypress.io/commands/location')
-      expect(location.host).to.eq('example.cypress.io')
-      expect(location.hostname).to.eq('example.cypress.io')
-      expect(location.origin).to.eq('https://example.cypress.io')
-      expect(location.pathname).to.eq('/commands/location')
-      expect(location.port).to.eq('')
-      expect(location.protocol).to.eq('https:')
-      expect(location.search).to.be.empty
-    })
-  })
-
-  it('cy.url() - get the current URL', () => {
-    // https://on.cypress.io/url
-    cy.url().should('eq', 'https://example.cypress.io/commands/location')
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/misc.spec.js b/client/cypress/integration/2-advanced-examples/misc.spec.js
deleted file mode 100644
index 7222bf4bd..000000000
--- a/client/cypress/integration/2-advanced-examples/misc.spec.js
+++ /dev/null
@@ -1,104 +0,0 @@
-/// <reference types="cypress" />
-
-context('Misc', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/misc')
-  })
-
-  it('.end() - end the command chain', () => {
-    // https://on.cypress.io/end
-
-    // cy.end is useful when you want to end a chain of commands
-    // and force Cypress to re-query from the root element
-    cy.get('.misc-table').within(() => {
-      // ends the current chain and yields null
-      cy.contains('Cheryl').click().end()
-
-      // queries the entire table again
-      cy.contains('Charles').click()
-    })
-  })
-
-  it('cy.exec() - execute a system command', () => {
-    // execute a system command.
-    // so you can take actions necessary for
-    // your test outside the scope of Cypress.
-    // https://on.cypress.io/exec
-
-    // we can use Cypress.platform string to
-    // select appropriate command
-    // https://on.cypress/io/platform
-    cy.log(`Platform ${Cypress.platform} architecture ${Cypress.arch}`)
-
-    // on CircleCI Windows build machines we have a failure to run bash shell
-    // https://github.com/cypress-io/cypress/issues/5169
-    // so skip some of the tests by passing flag "--env circle=true"
-    const isCircleOnWindows = Cypress.platform === 'win32' && Cypress.env('circle')
-
-    if (isCircleOnWindows) {
-      cy.log('Skipping test on CircleCI')
-
-      return
-    }
-
-    // cy.exec problem on Shippable CI
-    // https://github.com/cypress-io/cypress/issues/6718
-    const isShippable = Cypress.platform === 'linux' && Cypress.env('shippable')
-
-    if (isShippable) {
-      cy.log('Skipping test on ShippableCI')
-
-      return
-    }
-
-    cy.exec('echo Jane Lane')
-      .its('stdout').should('contain', 'Jane Lane')
-
-    if (Cypress.platform === 'win32') {
-      cy.exec('print cypress.json')
-        .its('stderr').should('be.empty')
-    } else {
-      cy.exec('cat cypress.json')
-        .its('stderr').should('be.empty')
-
-      cy.exec('pwd')
-        .its('code').should('eq', 0)
-    }
-  })
-
-  it('cy.focused() - get the DOM element that has focus', () => {
-    // https://on.cypress.io/focused
-    cy.get('.misc-form').find('#name').click()
-    cy.focused().should('have.id', 'name')
-
-    cy.get('.misc-form').find('#description').click()
-    cy.focused().should('have.id', 'description')
-  })
-
-  context('Cypress.Screenshot', function () {
-    it('cy.screenshot() - take a screenshot', () => {
-      // https://on.cypress.io/screenshot
-      cy.screenshot('my-image')
-    })
-
-    it('Cypress.Screenshot.defaults() - change default config of screenshots', function () {
-      Cypress.Screenshot.defaults({
-        blackout: ['.foo'],
-        capture: 'viewport',
-        clip: { x: 0, y: 0, width: 200, height: 200 },
-        scale: false,
-        disableTimersAndAnimations: true,
-        screenshotOnRunFailure: true,
-        onBeforeScreenshot () { },
-        onAfterScreenshot () { },
-      })
-    })
-  })
-
-  it('cy.wrap() - wrap an object', () => {
-    // https://on.cypress.io/wrap
-    cy.wrap({ foo: 'bar' })
-      .should('have.property', 'foo')
-      .and('include', 'bar')
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/navigation.spec.js b/client/cypress/integration/2-advanced-examples/navigation.spec.js
deleted file mode 100644
index b85a46890..000000000
--- a/client/cypress/integration/2-advanced-examples/navigation.spec.js
+++ /dev/null
@@ -1,56 +0,0 @@
-/// <reference types="cypress" />
-
-context('Navigation', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io')
-    cy.get('.navbar-nav').contains('Commands').click()
-    cy.get('.dropdown-menu').contains('Navigation').click()
-  })
-
-  it('cy.go() - go back or forward in the browser\'s history', () => {
-    // https://on.cypress.io/go
-
-    cy.location('pathname').should('include', 'navigation')
-
-    cy.go('back')
-    cy.location('pathname').should('not.include', 'navigation')
-
-    cy.go('forward')
-    cy.location('pathname').should('include', 'navigation')
-
-    // clicking back
-    cy.go(-1)
-    cy.location('pathname').should('not.include', 'navigation')
-
-    // clicking forward
-    cy.go(1)
-    cy.location('pathname').should('include', 'navigation')
-  })
-
-  it('cy.reload() - reload the page', () => {
-    // https://on.cypress.io/reload
-    cy.reload()
-
-    // reload the page without using the cache
-    cy.reload(true)
-  })
-
-  it('cy.visit() - visit a remote url', () => {
-    // https://on.cypress.io/visit
-
-    // Visit any sub-domain of your current domain
-
-    // Pass options to the visit
-    cy.visit('https://example.cypress.io/commands/navigation', {
-      timeout: 50000, // increase total time for the visit to resolve
-      onBeforeLoad (contentWindow) {
-        // contentWindow is the remote page's window object
-        expect(typeof contentWindow === 'object').to.be.true
-      },
-      onLoad (contentWindow) {
-        // contentWindow is the remote page's window object
-        expect(typeof contentWindow === 'object').to.be.true
-      },
-    })
-    })
-})
diff --git a/client/cypress/integration/2-advanced-examples/network_requests.spec.js b/client/cypress/integration/2-advanced-examples/network_requests.spec.js
deleted file mode 100644
index 11213a0e8..000000000
--- a/client/cypress/integration/2-advanced-examples/network_requests.spec.js
+++ /dev/null
@@ -1,163 +0,0 @@
-/// <reference types="cypress" />
-
-context('Network Requests', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/network-requests')
-  })
-
-  // Manage HTTP requests in your app
-
-  it('cy.request() - make an XHR request', () => {
-    // https://on.cypress.io/request
-    cy.request('https://jsonplaceholder.cypress.io/comments')
-      .should((response) => {
-        expect(response.status).to.eq(200)
-        // the server sometimes gets an extra comment posted from another machine
-        // which gets returned as 1 extra object
-        expect(response.body).to.have.property('length').and.be.oneOf([500, 501])
-        expect(response).to.have.property('headers')
-        expect(response).to.have.property('duration')
-      })
-  })
-
-  it('cy.request() - verify response using BDD syntax', () => {
-    cy.request('https://jsonplaceholder.cypress.io/comments')
-    .then((response) => {
-      // https://on.cypress.io/assertions
-      expect(response).property('status').to.equal(200)
-      expect(response).property('body').to.have.property('length').and.be.oneOf([500, 501])
-      expect(response).to.include.keys('headers', 'duration')
-    })
-  })
-
-  it('cy.request() with query parameters', () => {
-    // will execute request
-    // https://jsonplaceholder.cypress.io/comments?postId=1&id=3
-    cy.request({
-      url: 'https://jsonplaceholder.cypress.io/comments',
-      qs: {
-        postId: 1,
-        id: 3,
-      },
-    })
-    .its('body')
-    .should('be.an', 'array')
-    .and('have.length', 1)
-    .its('0') // yields first element of the array
-    .should('contain', {
-      postId: 1,
-      id: 3,
-    })
-  })
-
-  it('cy.request() - pass result to the second request', () => {
-    // first, let's find out the userId of the first user we have
-    cy.request('https://jsonplaceholder.cypress.io/users?_limit=1')
-      .its('body') // yields the response object
-      .its('0') // yields the first element of the returned list
-      // the above two commands its('body').its('0')
-      // can be written as its('body.0')
-      // if you do not care about TypeScript checks
-      .then((user) => {
-        expect(user).property('id').to.be.a('number')
-        // make a new post on behalf of the user
-        cy.request('POST', 'https://jsonplaceholder.cypress.io/posts', {
-          userId: user.id,
-          title: 'Cypress Test Runner',
-          body: 'Fast, easy and reliable testing for anything that runs in a browser.',
-        })
-      })
-      // note that the value here is the returned value of the 2nd request
-      // which is the new post object
-      .then((response) => {
-        expect(response).property('status').to.equal(201) // new entity created
-        expect(response).property('body').to.contain({
-          title: 'Cypress Test Runner',
-        })
-
-        // we don't know the exact post id - only that it will be > 100
-        // since JSONPlaceholder has built-in 100 posts
-        expect(response.body).property('id').to.be.a('number')
-          .and.to.be.gt(100)
-
-        // we don't know the user id here - since it was in above closure
-        // so in this test just confirm that the property is there
-        expect(response.body).property('userId').to.be.a('number')
-      })
-  })
-
-  it('cy.request() - save response in the shared test context', () => {
-    // https://on.cypress.io/variables-and-aliases
-    cy.request('https://jsonplaceholder.cypress.io/users?_limit=1')
-      .its('body').its('0') // yields the first element of the returned list
-      .as('user') // saves the object in the test context
-      .then(function () {
-        // NOTE 👀
-        //  By the time this callback runs the "as('user')" command
-        //  has saved the user object in the test context.
-        //  To access the test context we need to use
-        //  the "function () { ... }" callback form,
-        //  otherwise "this" points at a wrong or undefined object!
-        cy.request('POST', 'https://jsonplaceholder.cypress.io/posts', {
-          userId: this.user.id,
-          title: 'Cypress Test Runner',
-          body: 'Fast, easy and reliable testing for anything that runs in a browser.',
-        })
-        .its('body').as('post') // save the new post from the response
-      })
-      .then(function () {
-        // When this callback runs, both "cy.request" API commands have finished
-        // and the test context has "user" and "post" objects set.
-        // Let's verify them.
-        expect(this.post, 'post has the right user id').property('userId').to.equal(this.user.id)
-      })
-  })
-
-  it('cy.intercept() - route responses to matching requests', () => {
-    // https://on.cypress.io/intercept
-
-    let message = 'whoa, this comment does not exist'
-
-    // Listen to GET to comments/1
-    cy.intercept('GET', '**/comments/*').as('getComment')
-
-    // we have code that gets a comment when
-    // the button is clicked in scripts.js
-    cy.get('.network-btn').click()
-
-    // https://on.cypress.io/wait
-    cy.wait('@getComment').its('response.statusCode').should('be.oneOf', [200, 304])
-
-    // Listen to POST to comments
-    cy.intercept('POST', '**/comments').as('postComment')
-
-    // we have code that posts a comment when
-    // the button is clicked in scripts.js
-    cy.get('.network-post').click()
-    cy.wait('@postComment').should(({ request, response }) => {
-      expect(request.body).to.include('email')
-      expect(request.headers).to.have.property('content-type')
-      expect(response && response.body).to.have.property('name', 'Using POST in cy.intercept()')
-    })
-
-    // Stub a response to PUT comments/ ****
-    cy.intercept({
-      method: 'PUT',
-      url: '**/comments/*',
-    }, {
-      statusCode: 404,
-      body: { error: message },
-      headers: { 'access-control-allow-origin': '*' },
-      delayMs: 500,
-    }).as('putComment')
-
-    // we have code that puts a comment when
-    // the button is clicked in scripts.js
-    cy.get('.network-put').click()
-
-    cy.wait('@putComment')
-
-    // our 404 statusCode logic in scripts.js executed
-    cy.get('.network-put-comment').should('contain', message)
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/querying.spec.js b/client/cypress/integration/2-advanced-examples/querying.spec.js
deleted file mode 100644
index 00970480f..000000000
--- a/client/cypress/integration/2-advanced-examples/querying.spec.js
+++ /dev/null
@@ -1,114 +0,0 @@
-/// <reference types="cypress" />
-
-context('Querying', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/querying')
-  })
-
-  // The most commonly used query is 'cy.get()', you can
-  // think of this like the '$' in jQuery
-
-  it('cy.get() - query DOM elements', () => {
-    // https://on.cypress.io/get
-
-    cy.get('#query-btn').should('contain', 'Button')
-
-    cy.get('.query-btn').should('contain', 'Button')
-
-    cy.get('#querying .well>button:first').should('contain', 'Button')
-    //              ↲
-    // Use CSS selectors just like jQuery
-
-    cy.get('[data-test-id="test-example"]').should('have.class', 'example')
-
-    // 'cy.get()' yields jQuery object, you can get its attribute
-    // by invoking `.attr()` method
-    cy.get('[data-test-id="test-example"]')
-      .invoke('attr', 'data-test-id')
-      .should('equal', 'test-example')
-
-    // or you can get element's CSS property
-    cy.get('[data-test-id="test-example"]')
-      .invoke('css', 'position')
-      .should('equal', 'static')
-
-    // or use assertions directly during 'cy.get()'
-    // https://on.cypress.io/assertions
-    cy.get('[data-test-id="test-example"]')
-      .should('have.attr', 'data-test-id', 'test-example')
-      .and('have.css', 'position', 'static')
-  })
-
-  it('cy.contains() - query DOM elements with matching content', () => {
-    // https://on.cypress.io/contains
-    cy.get('.query-list')
-      .contains('bananas')
-      .should('have.class', 'third')
-
-    // we can pass a regexp to `.contains()`
-    cy.get('.query-list')
-      .contains(/^b\w+/)
-      .should('have.class', 'third')
-
-    cy.get('.query-list')
-      .contains('apples')
-      .should('have.class', 'first')
-
-    // passing a selector to contains will
-    // yield the selector containing the text
-    cy.get('#querying')
-      .contains('ul', 'oranges')
-      .should('have.class', 'query-list')
-
-    cy.get('.query-button')
-      .contains('Save Form')
-      .should('have.class', 'btn')
-  })
-
-  it('.within() - query DOM elements within a specific element', () => {
-    // https://on.cypress.io/within
-    cy.get('.query-form').within(() => {
-      cy.get('input:first').should('have.attr', 'placeholder', 'Email')
-      cy.get('input:last').should('have.attr', 'placeholder', 'Password')
-    })
-  })
-
-  it('cy.root() - query the root DOM element', () => {
-    // https://on.cypress.io/root
-
-    // By default, root is the document
-    cy.root().should('match', 'html')
-
-    cy.get('.query-ul').within(() => {
-      // In this within, the root is now the ul DOM element
-      cy.root().should('have.class', 'query-ul')
-    })
-  })
-
-  it('best practices - selecting elements', () => {
-    // https://on.cypress.io/best-practices#Selecting-Elements
-    cy.get('[data-cy=best-practices-selecting-elements]').within(() => {
-      // Worst - too generic, no context
-      cy.get('button').click()
-
-      // Bad. Coupled to styling. Highly subject to change.
-      cy.get('.btn.btn-large').click()
-
-      // Average. Coupled to the `name` attribute which has HTML semantics.
-      cy.get('[name=submission]').click()
-
-      // Better. But still coupled to styling or JS event listeners.
-      cy.get('#main').click()
-
-      // Slightly better. Uses an ID but also ensures the element
-      // has an ARIA role attribute
-      cy.get('#main[role=button]').click()
-
-      // Much better. But still coupled to text content that may change.
-      cy.contains('Submit').click()
-
-      // Best. Insulated from all changes.
-      cy.get('[data-cy=submit]').click()
-    })
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/spies_stubs_clocks.spec.js b/client/cypress/integration/2-advanced-examples/spies_stubs_clocks.spec.js
deleted file mode 100644
index 18b643ecd..000000000
--- a/client/cypress/integration/2-advanced-examples/spies_stubs_clocks.spec.js
+++ /dev/null
@@ -1,205 +0,0 @@
-/// <reference types="cypress" />
-// remove no check once Cypress.sinon is typed
-// https://github.com/cypress-io/cypress/issues/6720
-
-context('Spies, Stubs, and Clock', () => {
-  it('cy.spy() - wrap a method in a spy', () => {
-    // https://on.cypress.io/spy
-    cy.visit('https://example.cypress.io/commands/spies-stubs-clocks')
-
-    const obj = {
-      foo () {},
-    }
-
-    const spy = cy.spy(obj, 'foo').as('anyArgs')
-
-    obj.foo()
-
-    expect(spy).to.be.called
-  })
-
-  it('cy.spy() retries until assertions pass', () => {
-    cy.visit('https://example.cypress.io/commands/spies-stubs-clocks')
-
-    const obj = {
-      /**
-       * Prints the argument passed
-       * @param x {any}
-      */
-      foo (x) {
-        console.log('obj.foo called with', x)
-      },
-    }
-
-    cy.spy(obj, 'foo').as('foo')
-
-    setTimeout(() => {
-      obj.foo('first')
-    }, 500)
-
-    setTimeout(() => {
-      obj.foo('second')
-    }, 2500)
-
-    cy.get('@foo').should('have.been.calledTwice')
-  })
-
-  it('cy.stub() - create a stub and/or replace a function with stub', () => {
-    // https://on.cypress.io/stub
-    cy.visit('https://example.cypress.io/commands/spies-stubs-clocks')
-
-    const obj = {
-      /**
-       * prints both arguments to the console
-       * @param a {string}
-       * @param b {string}
-      */
-      foo (a, b) {
-        console.log('a', a, 'b', b)
-      },
-    }
-
-    const stub = cy.stub(obj, 'foo').as('foo')
-
-    obj.foo('foo', 'bar')
-
-    expect(stub).to.be.called
-  })
-
-  it('cy.clock() - control time in the browser', () => {
-    // https://on.cypress.io/clock
-
-    // create the date in UTC so its always the same
-    // no matter what local timezone the browser is running in
-    const now = new Date(Date.UTC(2017, 2, 14)).getTime()
-
-    cy.clock(now)
-    cy.visit('https://example.cypress.io/commands/spies-stubs-clocks')
-    cy.get('#clock-div').click()
-      .should('have.text', '1489449600')
-  })
-
-  it('cy.tick() - move time in the browser', () => {
-    // https://on.cypress.io/tick
-
-    // create the date in UTC so its always the same
-    // no matter what local timezone the browser is running in
-    const now = new Date(Date.UTC(2017, 2, 14)).getTime()
-
-    cy.clock(now)
-    cy.visit('https://example.cypress.io/commands/spies-stubs-clocks')
-    cy.get('#tick-div').click()
-      .should('have.text', '1489449600')
-
-    cy.tick(10000) // 10 seconds passed
-    cy.get('#tick-div').click()
-      .should('have.text', '1489449610')
-  })
-
-  it('cy.stub() matches depending on arguments', () => {
-    // see all possible matchers at
-    // https://sinonjs.org/releases/latest/matchers/
-    const greeter = {
-      /**
-       * Greets a person
-       * @param {string} name
-      */
-      greet (name) {
-        return `Hello, ${name}!`
-      },
-    }
-
-    cy.stub(greeter, 'greet')
-      .callThrough() // if you want non-matched calls to call the real method
-      .withArgs(Cypress.sinon.match.string).returns('Hi')
-      .withArgs(Cypress.sinon.match.number).throws(new Error('Invalid name'))
-
-    expect(greeter.greet('World')).to.equal('Hi')
-    // @ts-ignore
-    expect(() => greeter.greet(42)).to.throw('Invalid name')
-    expect(greeter.greet).to.have.been.calledTwice
-
-    // non-matched calls goes the actual method
-    // @ts-ignore
-    expect(greeter.greet()).to.equal('Hello, undefined!')
-  })
-
-  it('matches call arguments using Sinon matchers', () => {
-    // see all possible matchers at
-    // https://sinonjs.org/releases/latest/matchers/
-    const calculator = {
-      /**
-       * returns the sum of two arguments
-       * @param a {number}
-       * @param b {number}
-      */
-      add (a, b) {
-        return a + b
-      },
-    }
-
-    const spy = cy.spy(calculator, 'add').as('add')
-
-    expect(calculator.add(2, 3)).to.equal(5)
-
-    // if we want to assert the exact values used during the call
-    expect(spy).to.be.calledWith(2, 3)
-
-    // let's confirm "add" method was called with two numbers
-    expect(spy).to.be.calledWith(Cypress.sinon.match.number, Cypress.sinon.match.number)
-
-    // alternatively, provide the value to match
-    expect(spy).to.be.calledWith(Cypress.sinon.match(2), Cypress.sinon.match(3))
-
-    // match any value
-    expect(spy).to.be.calledWith(Cypress.sinon.match.any, 3)
-
-    // match any value from a list
-    expect(spy).to.be.calledWith(Cypress.sinon.match.in([1, 2, 3]), 3)
-
-    /**
-     * Returns true if the given number is event
-     * @param {number} x
-     */
-    const isEven = (x) => x % 2 === 0
-
-    // expect the value to pass a custom predicate function
-    // the second argument to "sinon.match(predicate, message)" is
-    // shown if the predicate does not pass and assertion fails
-    expect(spy).to.be.calledWith(Cypress.sinon.match(isEven, 'isEven'), 3)
-
-    /**
-     * Returns a function that checks if a given number is larger than the limit
-     * @param {number} limit
-     * @returns {(x: number) => boolean}
-     */
-    const isGreaterThan = (limit) => (x) => x > limit
-
-    /**
-     * Returns a function that checks if a given number is less than the limit
-     * @param {number} limit
-     * @returns {(x: number) => boolean}
-     */
-    const isLessThan = (limit) => (x) => x < limit
-
-    // you can combine several matchers using "and", "or"
-    expect(spy).to.be.calledWith(
-      Cypress.sinon.match.number,
-      Cypress.sinon.match(isGreaterThan(2), '> 2').and(Cypress.sinon.match(isLessThan(4), '< 4')),
-    )
-
-    expect(spy).to.be.calledWith(
-      Cypress.sinon.match.number,
-      Cypress.sinon.match(isGreaterThan(200), '> 200').or(Cypress.sinon.match(3)),
-    )
-
-    // matchers can be used from BDD assertions
-    cy.get('@add').should('have.been.calledWith',
-      Cypress.sinon.match.number, Cypress.sinon.match(3))
-
-    // you can alias matchers for shorter test code
-    const { match: M } = Cypress.sinon
-
-    cy.get('@add').should('have.been.calledWith', M.number, M(3))
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/traversal.spec.js b/client/cypress/integration/2-advanced-examples/traversal.spec.js
deleted file mode 100644
index 0a3b9d330..000000000
--- a/client/cypress/integration/2-advanced-examples/traversal.spec.js
+++ /dev/null
@@ -1,121 +0,0 @@
-/// <reference types="cypress" />
-
-context('Traversal', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/traversal')
-  })
-
-  it('.children() - get child DOM elements', () => {
-    // https://on.cypress.io/children
-    cy.get('.traversal-breadcrumb')
-      .children('.active')
-      .should('contain', 'Data')
-  })
-
-  it('.closest() - get closest ancestor DOM element', () => {
-    // https://on.cypress.io/closest
-    cy.get('.traversal-badge')
-      .closest('ul')
-      .should('have.class', 'list-group')
-  })
-
-  it('.eq() - get a DOM element at a specific index', () => {
-    // https://on.cypress.io/eq
-    cy.get('.traversal-list>li')
-      .eq(1).should('contain', 'siamese')
-  })
-
-  it('.filter() - get DOM elements that match the selector', () => {
-    // https://on.cypress.io/filter
-    cy.get('.traversal-nav>li')
-      .filter('.active').should('contain', 'About')
-  })
-
-  it('.find() - get descendant DOM elements of the selector', () => {
-    // https://on.cypress.io/find
-    cy.get('.traversal-pagination')
-      .find('li').find('a')
-      .should('have.length', 7)
-  })
-
-  it('.first() - get first DOM element', () => {
-    // https://on.cypress.io/first
-    cy.get('.traversal-table td')
-      .first().should('contain', '1')
-  })
-
-  it('.last() - get last DOM element', () => {
-    // https://on.cypress.io/last
-    cy.get('.traversal-buttons .btn')
-      .last().should('contain', 'Submit')
-  })
-
-  it('.next() - get next sibling DOM element', () => {
-    // https://on.cypress.io/next
-    cy.get('.traversal-ul')
-      .contains('apples').next().should('contain', 'oranges')
-  })
-
-  it('.nextAll() - get all next sibling DOM elements', () => {
-    // https://on.cypress.io/nextall
-    cy.get('.traversal-next-all')
-      .contains('oranges')
-      .nextAll().should('have.length', 3)
-  })
-
-  it('.nextUntil() - get next sibling DOM elements until next el', () => {
-    // https://on.cypress.io/nextuntil
-    cy.get('#veggies')
-      .nextUntil('#nuts').should('have.length', 3)
-  })
-
-  it('.not() - remove DOM elements from set of DOM elements', () => {
-    // https://on.cypress.io/not
-    cy.get('.traversal-disabled .btn')
-      .not('[disabled]').should('not.contain', 'Disabled')
-  })
-
-  it('.parent() - get parent DOM element from DOM elements', () => {
-    // https://on.cypress.io/parent
-    cy.get('.traversal-mark')
-      .parent().should('contain', 'Morbi leo risus')
-  })
-
-  it('.parents() - get parent DOM elements from DOM elements', () => {
-    // https://on.cypress.io/parents
-    cy.get('.traversal-cite')
-      .parents().should('match', 'blockquote')
-  })
-
-  it('.parentsUntil() - get parent DOM elements from DOM elements until el', () => {
-    // https://on.cypress.io/parentsuntil
-    cy.get('.clothes-nav')
-      .find('.active')
-      .parentsUntil('.clothes-nav')
-      .should('have.length', 2)
-  })
-
-  it('.prev() - get previous sibling DOM element', () => {
-    // https://on.cypress.io/prev
-    cy.get('.birds').find('.active')
-      .prev().should('contain', 'Lorikeets')
-  })
-
-  it('.prevAll() - get all previous sibling DOM elements', () => {
-    // https://on.cypress.io/prevall
-    cy.get('.fruits-list').find('.third')
-      .prevAll().should('have.length', 2)
-  })
-
-  it('.prevUntil() - get all previous sibling DOM elements until el', () => {
-    // https://on.cypress.io/prevuntil
-    cy.get('.foods-list').find('#nuts')
-      .prevUntil('#veggies').should('have.length', 3)
-  })
-
-  it('.siblings() - get all sibling DOM elements', () => {
-    // https://on.cypress.io/siblings
-    cy.get('.traversal-pills .active')
-      .siblings().should('have.length', 2)
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/utilities.spec.js b/client/cypress/integration/2-advanced-examples/utilities.spec.js
deleted file mode 100644
index 24e61a6a7..000000000
--- a/client/cypress/integration/2-advanced-examples/utilities.spec.js
+++ /dev/null
@@ -1,110 +0,0 @@
-/// <reference types="cypress" />
-
-context('Utilities', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/utilities')
-  })
-
-  it('Cypress._ - call a lodash method', () => {
-    // https://on.cypress.io/_
-    cy.request('https://jsonplaceholder.cypress.io/users')
-      .then((response) => {
-        let ids = Cypress._.chain(response.body).map('id').take(3).value()
-
-        expect(ids).to.deep.eq([1, 2, 3])
-      })
-  })
-
-  it('Cypress.$ - call a jQuery method', () => {
-    // https://on.cypress.io/$
-    let $li = Cypress.$('.utility-jquery li:first')
-
-    cy.wrap($li)
-      .should('not.have.class', 'active')
-      .click()
-      .should('have.class', 'active')
-  })
-
-  it('Cypress.Blob - blob utilities and base64 string conversion', () => {
-    // https://on.cypress.io/blob
-    cy.get('.utility-blob').then(($div) => {
-      // https://github.com/nolanlawson/blob-util#imgSrcToDataURL
-      // get the dataUrl string for the javascript-logo
-      return Cypress.Blob.imgSrcToDataURL('https://example.cypress.io/assets/img/javascript-logo.png', undefined, 'anonymous')
-      .then((dataUrl) => {
-        // create an <img> element and set its src to the dataUrl
-        let img = Cypress.$('<img />', { src: dataUrl })
-
-        // need to explicitly return cy here since we are initially returning
-        // the Cypress.Blob.imgSrcToDataURL promise to our test
-        // append the image
-        $div.append(img)
-
-        cy.get('.utility-blob img').click()
-          .should('have.attr', 'src', dataUrl)
-      })
-    })
-  })
-
-  it('Cypress.minimatch - test out glob patterns against strings', () => {
-    // https://on.cypress.io/minimatch
-    let matching = Cypress.minimatch('/users/1/comments', '/users/*/comments', {
-      matchBase: true,
-    })
-
-    expect(matching, 'matching wildcard').to.be.true
-
-    matching = Cypress.minimatch('/users/1/comments/2', '/users/*/comments', {
-      matchBase: true,
-    })
-
-    expect(matching, 'comments').to.be.false
-
-    // ** matches against all downstream path segments
-    matching = Cypress.minimatch('/foo/bar/baz/123/quux?a=b&c=2', '/foo/**', {
-      matchBase: true,
-    })
-
-    expect(matching, 'comments').to.be.true
-
-    // whereas * matches only the next path segment
-
-    matching = Cypress.minimatch('/foo/bar/baz/123/quux?a=b&c=2', '/foo/*', {
-      matchBase: false,
-    })
-
-    expect(matching, 'comments').to.be.false
-  })
-
-  it('Cypress.Promise - instantiate a bluebird promise', () => {
-    // https://on.cypress.io/promise
-    let waited = false
-
-    /**
-     * @return Bluebird<string>
-     */
-    function waitOneSecond () {
-      // return a promise that resolves after 1 second
-      // @ts-ignore TS2351 (new Cypress.Promise)
-      return new Cypress.Promise((resolve, reject) => {
-        setTimeout(() => {
-          // set waited to true
-          waited = true
-
-          // resolve with 'foo' string
-          resolve('foo')
-        }, 1000)
-      })
-    }
-
-    cy.then(() => {
-      // return a promise to cy.then() that
-      // is awaited until it resolves
-      // @ts-ignore TS7006
-      return waitOneSecond().then((str) => {
-        expect(str).to.eq('foo')
-        expect(waited).to.be.true
-      })
-    })
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/viewport.spec.js b/client/cypress/integration/2-advanced-examples/viewport.spec.js
deleted file mode 100644
index dbcd7eedd..000000000
--- a/client/cypress/integration/2-advanced-examples/viewport.spec.js
+++ /dev/null
@@ -1,59 +0,0 @@
-/// <reference types="cypress" />
-
-context('Viewport', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/viewport')
-  })
-
-  it('cy.viewport() - set the viewport size and dimension', () => {
-    // https://on.cypress.io/viewport
-
-    cy.get('#navbar').should('be.visible')
-    cy.viewport(320, 480)
-
-    // the navbar should have collapse since our screen is smaller
-    cy.get('#navbar').should('not.be.visible')
-    cy.get('.navbar-toggle').should('be.visible').click()
-    cy.get('.nav').find('a').should('be.visible')
-
-    // lets see what our app looks like on a super large screen
-    cy.viewport(2999, 2999)
-
-    // cy.viewport() accepts a set of preset sizes
-    // to easily set the screen to a device's width and height
-
-    // We added a cy.wait() between each viewport change so you can see
-    // the change otherwise it is a little too fast to see :)
-
-    cy.viewport('macbook-15')
-    cy.wait(200)
-    cy.viewport('macbook-13')
-    cy.wait(200)
-    cy.viewport('macbook-11')
-    cy.wait(200)
-    cy.viewport('ipad-2')
-    cy.wait(200)
-    cy.viewport('ipad-mini')
-    cy.wait(200)
-    cy.viewport('iphone-6+')
-    cy.wait(200)
-    cy.viewport('iphone-6')
-    cy.wait(200)
-    cy.viewport('iphone-5')
-    cy.wait(200)
-    cy.viewport('iphone-4')
-    cy.wait(200)
-    cy.viewport('iphone-3')
-    cy.wait(200)
-
-    // cy.viewport() accepts an orientation for all presets
-    // the default orientation is 'portrait'
-    cy.viewport('ipad-2', 'portrait')
-    cy.wait(200)
-    cy.viewport('iphone-4', 'landscape')
-    cy.wait(200)
-
-    // The viewport will be reset back to the default dimensions
-    // in between tests (the  default can be set in cypress.json)
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/waiting.spec.js b/client/cypress/integration/2-advanced-examples/waiting.spec.js
deleted file mode 100644
index c8f0d7c67..000000000
--- a/client/cypress/integration/2-advanced-examples/waiting.spec.js
+++ /dev/null
@@ -1,31 +0,0 @@
-/// <reference types="cypress" />
-
-context('Waiting', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/waiting')
-  })
-  // BE CAREFUL of adding unnecessary wait times.
-  // https://on.cypress.io/best-practices#Unnecessary-Waiting
-
-  // https://on.cypress.io/wait
-  it('cy.wait() - wait for a specific amount of time', () => {
-    cy.get('.wait-input1').type('Wait 1000ms after typing')
-    cy.wait(1000)
-    cy.get('.wait-input2').type('Wait 1000ms after typing')
-    cy.wait(1000)
-    cy.get('.wait-input3').type('Wait 1000ms after typing')
-    cy.wait(1000)
-  })
-
-  it('cy.wait() - wait for a specific route', () => {
-    // Listen to GET to comments/1
-    cy.intercept('GET', '**/comments/*').as('getComment')
-
-    // we have code that gets a comment when
-    // the button is clicked in scripts.js
-    cy.get('.network-btn').click()
-
-    // wait for GET comments/1
-    cy.wait('@getComment').its('response.statusCode').should('be.oneOf', [200, 304])
-  })
-})
diff --git a/client/cypress/integration/2-advanced-examples/window.spec.js b/client/cypress/integration/2-advanced-examples/window.spec.js
deleted file mode 100644
index f94b64971..000000000
--- a/client/cypress/integration/2-advanced-examples/window.spec.js
+++ /dev/null
@@ -1,22 +0,0 @@
-/// <reference types="cypress" />
-
-context('Window', () => {
-  beforeEach(() => {
-    cy.visit('https://example.cypress.io/commands/window')
-  })
-
-  it('cy.window() - get the global window object', () => {
-    // https://on.cypress.io/window
-    cy.window().should('have.property', 'top')
-  })
-
-  it('cy.document() - get the document object', () => {
-    // https://on.cypress.io/document
-    cy.document().should('have.property', 'charset').and('eq', 'UTF-8')
-  })
-
-  it('cy.title() - get the title', () => {
-    // https://on.cypress.io/title
-    cy.title().should('include', 'Kitchen Sink')
-  })
-})
diff --git a/client/cypress/plugins/index.js b/client/cypress/plugins/index.js
deleted file mode 100644
index 59b2bab6e..000000000
--- a/client/cypress/plugins/index.js
+++ /dev/null
@@ -1,22 +0,0 @@
-/// <reference types="cypress" />
-// ***********************************************************
-// This example plugins/index.js can be used to load plugins
-//
-// You can change the location of this file or turn off loading
-// the plugins file with the 'pluginsFile' configuration option.
-//
-// You can read more here:
-// https://on.cypress.io/plugins-guide
-// ***********************************************************
-
-// This function is called when a project is opened or re-opened (e.g. due to
-// the project's config changing)
-
-/**
- * @type {Cypress.PluginConfig}
- */
-// eslint-disable-next-line no-unused-vars
-module.exports = (on, config) => {
-  // `on` is used to hook into various events Cypress emits
-  // `config` is the resolved Cypress config
-}
diff --git a/client/cypress/support/commands.js b/client/cypress/support/commands.js
index 81f195804..66ea16ef0 100644
--- a/client/cypress/support/commands.js
+++ b/client/cypress/support/commands.js
@@ -22,6 +22,4 @@
 //
 //
 // -- This will overwrite an existing command --
-// Cypress.Commands.overwrite('visit', (originalFn, url, options) => { ... })
-
-import "@testing-library/cypress/add-commands";
+// Cypress.Commands.overwrite('visit', (originalFn, url, options) => { ... })
\ No newline at end of file
diff --git a/client/cypress/support/index.js b/client/cypress/support/e2e.js
similarity index 88%
rename from client/cypress/support/index.js
rename to client/cypress/support/e2e.js
index d68db96df..0e7290a13 100644
--- a/client/cypress/support/index.js
+++ b/client/cypress/support/e2e.js
@@ -1,5 +1,5 @@
 // ***********************************************************
-// This example support/index.js is processed and
+// This example support/e2e.js is processed and
 // loaded automatically before your test files.
 //
 // This is a great place to put global configuration and
@@ -17,4 +17,4 @@
 import './commands'
 
 // Alternatively you can use CommonJS syntax:
-// require('./commands')
+// require('./commands')
\ No newline at end of file
diff --git a/client/cypress/tsconfig.json b/client/cypress/tsconfig.json
deleted file mode 100644
index 36de33dee..000000000
--- a/client/cypress/tsconfig.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "compilerOptions": {
-    "allowJs": true,
-    "baseUrl": "../node_modules",
-    "types": ["cypress"]
-  },
-  "include": ["**/*.*"]
-}
diff --git a/client/package.json b/client/package.json
index c6eda0caa..c4983c53c 100644
--- a/client/package.json
+++ b/client/package.json
@@ -20,7 +20,6 @@
     "axios": "^0.27.2",
     "craco-less": "^1.20.0",
     "dinero.js": "^1.9.1",
-    "dotenv": "^16.0.1",
     "enquire-js": "^0.2.1",
     "env-cmd": "^10.1.0",
     "exifr": "^7.1.3",
@@ -82,8 +81,7 @@
     "workbox-range-requests": "^6.5.3",
     "workbox-routing": "^6.5.3",
     "workbox-strategies": "^6.5.3",
-    "workbox-streams": "^6.5.3",
-    "yauzl": "^2.10.0"
+    "workbox-streams": "^6.5.3"
   },
   "scripts": {
     "analyze": "source-map-explorer 'build/static/js/*.js'",
@@ -93,8 +91,7 @@
     "build-deploy:test": "yarn run build:test && s3cmd sync build/* s3://imex-online-test && echo '🚀 TESTING Deployed!'",
     "buildcra": "REACT_APP_GIT_SHA=`git rev-parse --short HEAD` craco build",
     "test": "cypress open",
-    "eject": "react-scripts eject",
-    "madge": "madge  --image ./madge-graph.svg --extensions js,jsx,ts,tsx --circular ."
+    "eject": "react-scripts eject"
   },
   "eslintConfig": {
     "extends": [
@@ -120,9 +117,7 @@
   },
   "devDependencies": {
     "@sentry/webpack-plugin": "^1.19.0",
-    "@testing-library/cypress": "^8.0.3",
-    "cypress": "^10.3.1",
-    "eslint-plugin-cypress": "^2.12.1",
+    "cypress": "^12.2.0",
     "react-error-overlay": "6.0.11",
     "redux-logger": "^3.0.6",
     "source-map-explorer": "^2.5.2"
diff --git a/client/patches/peerjs+1.3.2.patch b/client/patches/peerjs+1.3.2.patch
deleted file mode 100644
index 197ede2f2..000000000
--- a/client/patches/peerjs+1.3.2.patch
+++ /dev/null
@@ -1,13087 +0,0 @@
-diff --git a/node_modules/peerjs/dist/adapter.js b/node_modules/peerjs/dist/adapter.js
-new file mode 100644
-index 0000000..6bfbeb8
---- /dev/null
-+++ b/node_modules/peerjs/dist/adapter.js
-@@ -0,0 +1,8 @@
-+"use strict";
-+var __importDefault = (this && this.__importDefault) || function (mod) {
-+    return (mod && mod.__esModule) ? mod : { "default": mod };
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.webRTCAdapter = void 0;
-+var webrtc_adapter_1 = __importDefault(require("webrtc-adapter"));
-+exports.webRTCAdapter = webrtc_adapter_1.default;
-diff --git a/node_modules/peerjs/dist/api.js b/node_modules/peerjs/dist/api.js
-new file mode 100644
-index 0000000..8c091c2
---- /dev/null
-+++ b/node_modules/peerjs/dist/api.js
-@@ -0,0 +1,142 @@
-+"use strict";
-+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
-+    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
-+    return new (P || (P = Promise))(function (resolve, reject) {
-+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
-+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
-+        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
-+        step((generator = generator.apply(thisArg, _arguments || [])).next());
-+    });
-+};
-+var __generator = (this && this.__generator) || function (thisArg, body) {
-+    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
-+    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
-+    function verb(n) { return function (v) { return step([n, v]); }; }
-+    function step(op) {
-+        if (f) throw new TypeError("Generator is already executing.");
-+        while (_) try {
-+            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
-+            if (y = 0, t) op = [op[0] & 2, t.value];
-+            switch (op[0]) {
-+                case 0: case 1: t = op; break;
-+                case 4: _.label++; return { value: op[1], done: false };
-+                case 5: _.label++; y = op[1]; op = [0]; continue;
-+                case 7: op = _.ops.pop(); _.trys.pop(); continue;
-+                default:
-+                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
-+                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
-+                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
-+                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
-+                    if (t[2]) _.ops.pop();
-+                    _.trys.pop(); continue;
-+            }
-+            op = body.call(thisArg, _);
-+        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
-+        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
-+    }
-+};
-+var __importDefault = (this && this.__importDefault) || function (mod) {
-+    return (mod && mod.__esModule) ? mod : { "default": mod };
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.API = void 0;
-+var util_1 = require("./util");
-+var logger_1 = __importDefault(require("./logger"));
-+var API = /** @class */ (function () {
-+    function API(_options) {
-+        this._options = _options;
-+    }
-+    API.prototype._buildUrl = function (method) {
-+        var protocol = this._options.secure ? "https://" : "http://";
-+        var url = protocol +
-+            this._options.host +
-+            ":" +
-+            this._options.port +
-+            this._options.path +
-+            this._options.key +
-+            "/" +
-+            method;
-+        var queryString = "?ts=" + new Date().getTime() + "" + Math.random();
-+        url += queryString;
-+        return url;
-+    };
-+    /** Get a unique ID from the server via XHR and initialize with it. */
-+    API.prototype.retrieveId = function () {
-+        return __awaiter(this, void 0, void 0, function () {
-+            var url, response, error_1, pathError;
-+            return __generator(this, function (_a) {
-+                switch (_a.label) {
-+                    case 0:
-+                        url = this._buildUrl("id");
-+                        _a.label = 1;
-+                    case 1:
-+                        _a.trys.push([1, 3, , 4]);
-+                        return [4 /*yield*/, fetch(url)];
-+                    case 2:
-+                        response = _a.sent();
-+                        if (response.status !== 200) {
-+                            throw new Error("Error. Status:" + response.status);
-+                        }
-+                        return [2 /*return*/, response.text()];
-+                    case 3:
-+                        error_1 = _a.sent();
-+                        logger_1.default.error("Error retrieving ID", error_1);
-+                        pathError = "";
-+                        if (this._options.path === "/" &&
-+                            this._options.host !== util_1.util.CLOUD_HOST) {
-+                            pathError =
-+                                " If you passed in a `path` to your self-hosted PeerServer, " +
-+                                    "you'll also need to pass in that same path when creating a new " +
-+                                    "Peer.";
-+                        }
-+                        throw new Error("Could not get an ID from the server." + pathError);
-+                    case 4: return [2 /*return*/];
-+                }
-+            });
-+        });
-+    };
-+    /** @deprecated */
-+    API.prototype.listAllPeers = function () {
-+        return __awaiter(this, void 0, void 0, function () {
-+            var url, response, helpfulError, error_2;
-+            return __generator(this, function (_a) {
-+                switch (_a.label) {
-+                    case 0:
-+                        url = this._buildUrl("peers");
-+                        _a.label = 1;
-+                    case 1:
-+                        _a.trys.push([1, 3, , 4]);
-+                        return [4 /*yield*/, fetch(url)];
-+                    case 2:
-+                        response = _a.sent();
-+                        if (response.status !== 200) {
-+                            if (response.status === 401) {
-+                                helpfulError = "";
-+                                if (this._options.host === util_1.util.CLOUD_HOST) {
-+                                    helpfulError =
-+                                        "It looks like you're using the cloud server. You can email " +
-+                                            "team@peerjs.com to enable peer listing for your API key.";
-+                                }
-+                                else {
-+                                    helpfulError =
-+                                        "You need to enable `allow_discovery` on your self-hosted " +
-+                                            "PeerServer to use this feature.";
-+                                }
-+                                throw new Error("It doesn't look like you have permission to list peers IDs. " +
-+                                    helpfulError);
-+                            }
-+                            throw new Error("Error. Status:" + response.status);
-+                        }
-+                        return [2 /*return*/, response.json()];
-+                    case 3:
-+                        error_2 = _a.sent();
-+                        logger_1.default.error("Error retrieving list peers", error_2);
-+                        throw new Error("Could not get list peers from the server." + error_2);
-+                    case 4: return [2 /*return*/];
-+                }
-+            });
-+        });
-+    };
-+    return API;
-+}());
-+exports.API = API;
-diff --git a/node_modules/peerjs/dist/baseconnection.js b/node_modules/peerjs/dist/baseconnection.js
-new file mode 100644
-index 0000000..0c4e504
---- /dev/null
-+++ b/node_modules/peerjs/dist/baseconnection.js
-@@ -0,0 +1,40 @@
-+"use strict";
-+var __extends = (this && this.__extends) || (function () {
-+    var extendStatics = function (d, b) {
-+        extendStatics = Object.setPrototypeOf ||
-+            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
-+        return extendStatics(d, b);
-+    };
-+    return function (d, b) {
-+        if (typeof b !== "function" && b !== null)
-+            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
-+        extendStatics(d, b);
-+        function __() { this.constructor = d; }
-+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-+    };
-+})();
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.BaseConnection = void 0;
-+var eventemitter3_1 = require("eventemitter3");
-+var BaseConnection = /** @class */ (function (_super) {
-+    __extends(BaseConnection, _super);
-+    function BaseConnection(peer, provider, options) {
-+        var _this = _super.call(this) || this;
-+        _this.peer = peer;
-+        _this.provider = provider;
-+        _this.options = options;
-+        _this._open = false;
-+        _this.metadata = options.metadata;
-+        return _this;
-+    }
-+    Object.defineProperty(BaseConnection.prototype, "open", {
-+        get: function () {
-+            return this._open;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    return BaseConnection;
-+}(eventemitter3_1.EventEmitter));
-+exports.BaseConnection = BaseConnection;
-diff --git a/node_modules/peerjs/dist/dataconnection.js b/node_modules/peerjs/dist/dataconnection.js
-new file mode 100644
-index 0000000..64262ac
---- /dev/null
-+++ b/node_modules/peerjs/dist/dataconnection.js
-@@ -0,0 +1,298 @@
-+"use strict";
-+var __extends = (this && this.__extends) || (function () {
-+    var extendStatics = function (d, b) {
-+        extendStatics = Object.setPrototypeOf ||
-+            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
-+        return extendStatics(d, b);
-+    };
-+    return function (d, b) {
-+        if (typeof b !== "function" && b !== null)
-+            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
-+        extendStatics(d, b);
-+        function __() { this.constructor = d; }
-+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-+    };
-+})();
-+var __importDefault = (this && this.__importDefault) || function (mod) {
-+    return (mod && mod.__esModule) ? mod : { "default": mod };
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.DataConnection = void 0;
-+var util_1 = require("./util");
-+var logger_1 = __importDefault(require("./logger"));
-+var negotiator_1 = require("./negotiator");
-+var enums_1 = require("./enums");
-+var baseconnection_1 = require("./baseconnection");
-+var encodingQueue_1 = require("./encodingQueue");
-+/**
-+ * Wraps a DataChannel between two Peers.
-+ */
-+// @ts-ignore
-+var DataConnection = /** @class */ (function (_super) {
-+    __extends(DataConnection, _super);
-+    function DataConnection(peerId, provider, options) {
-+        var _this = _super.call(this, peerId, provider, options) || this;
-+        _this.stringify = JSON.stringify;
-+        _this.parse = JSON.parse;
-+        _this._buffer = [];
-+        _this._bufferSize = 0;
-+        _this._buffering = false;
-+        _this._chunkedData = {};
-+        _this._encodingQueue = new encodingQueue_1.EncodingQueue();
-+        _this.connectionId =
-+            _this.options.connectionId || DataConnection.ID_PREFIX + util_1.util.randomToken();
-+        _this.label = _this.options.label || _this.connectionId;
-+        _this.serialization = _this.options.serialization || enums_1.SerializationType.Binary;
-+        _this.reliable = !!_this.options.reliable;
-+        _this._encodingQueue.on('done', function (ab) {
-+            _this._bufferedSend(ab);
-+        });
-+        _this._encodingQueue.on('error', function () {
-+            logger_1.default.error("DC#" + _this.connectionId + ": Error occured in encoding from blob to arraybuffer, close DC");
-+            _this.close();
-+        });
-+        _this._negotiator = new negotiator_1.Negotiator(_this);
-+        _this._negotiator.startConnection(_this.options._payload || {
-+            originator: true
-+        });
-+        return _this;
-+    }
-+    Object.defineProperty(DataConnection.prototype, "type", {
-+        get: function () {
-+            return enums_1.ConnectionType.Data;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(DataConnection.prototype, "dataChannel", {
-+        get: function () {
-+            return this._dc;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(DataConnection.prototype, "bufferSize", {
-+        get: function () { return this._bufferSize; },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    /** Called by the Negotiator when the DataChannel is ready. */
-+    DataConnection.prototype.initialize = function (dc) {
-+        this._dc = dc;
-+        this._configureDataChannel();
-+    };
-+    DataConnection.prototype._configureDataChannel = function () {
-+        var _this = this;
-+        if (!util_1.util.supports.binaryBlob || util_1.util.supports.reliable) {
-+            this.dataChannel.binaryType = "arraybuffer";
-+        }
-+        this.dataChannel.onopen = function () {
-+            logger_1.default.log("DC#" + _this.connectionId + " dc connection success");
-+            _this._open = true;
-+            _this.emit(enums_1.ConnectionEventType.Open);
-+        };
-+        this.dataChannel.onmessage = function (e) {
-+            logger_1.default.log("DC#" + _this.connectionId + " dc onmessage:", e.data);
-+            _this._handleDataMessage(e);
-+        };
-+        this.dataChannel.onclose = function () {
-+            logger_1.default.log("DC#" + _this.connectionId + " dc closed for:", _this.peer);
-+            _this.close();
-+        };
-+    };
-+    // Handles a DataChannel message.
-+    DataConnection.prototype._handleDataMessage = function (_a) {
-+        var _this = this;
-+        var data = _a.data;
-+        var datatype = data.constructor;
-+        var isBinarySerialization = this.serialization === enums_1.SerializationType.Binary ||
-+            this.serialization === enums_1.SerializationType.BinaryUTF8;
-+        var deserializedData = data;
-+        if (isBinarySerialization) {
-+            if (datatype === Blob) {
-+                // Datatype should never be blob
-+                util_1.util.blobToArrayBuffer(data, function (ab) {
-+                    // @ts-ignore
-+                    var unpackedData = util_1.util.unpack(ab);
-+                    _this.emit(enums_1.ConnectionEventType.Data, unpackedData);
-+                });
-+                return;
-+            }
-+            else if (datatype === ArrayBuffer) {
-+                deserializedData = util_1.util.unpack(data);
-+            }
-+            else if (datatype === String) {
-+                // String fallback for binary data for browsers that don't support binary yet
-+                var ab = util_1.util.binaryStringToArrayBuffer(data);
-+                deserializedData = util_1.util.unpack(ab);
-+            }
-+        }
-+        else if (this.serialization === enums_1.SerializationType.JSON) {
-+            deserializedData = this.parse(data);
-+        }
-+        // Check if we've chunked--if so, piece things back together.
-+        // We're guaranteed that this isn't 0.
-+        if (deserializedData.__peerData) {
-+            this._handleChunk(deserializedData);
-+            return;
-+        }
-+        _super.prototype.emit.call(this, enums_1.ConnectionEventType.Data, deserializedData);
-+    };
-+    DataConnection.prototype._handleChunk = function (data) {
-+        var id = data.__peerData;
-+        var chunkInfo = this._chunkedData[id] || {
-+            data: [],
-+            count: 0,
-+            total: data.total
-+        };
-+        chunkInfo.data[data.n] = data.data;
-+        chunkInfo.count++;
-+        this._chunkedData[id] = chunkInfo;
-+        if (chunkInfo.total === chunkInfo.count) {
-+            // Clean up before making the recursive call to `_handleDataMessage`.
-+            delete this._chunkedData[id];
-+            // We've received all the chunks--time to construct the complete data.
-+            var data_1 = new Blob(chunkInfo.data);
-+            this._handleDataMessage({ data: data_1 });
-+        }
-+    };
-+    /**
-+     * Exposed functionality for users.
-+     */
-+    /** Allows user to close connection. */
-+    DataConnection.prototype.close = function () {
-+        this._buffer = [];
-+        this._bufferSize = 0;
-+        this._chunkedData = {};
-+        if (this._negotiator) {
-+            this._negotiator.cleanup();
-+            // @ts-ignore
-+            this._negotiator = null;
-+        }
-+        if (this.provider) {
-+            this.provider._removeConnection(this);
-+            // @ts-ignore
-+            this.provider = null;
-+        }
-+        if (this.dataChannel) {
-+            this.dataChannel.onopen = null;
-+            this.dataChannel.onmessage = null;
-+            this.dataChannel.onclose = null;
-+            // @ts-ignore
-+            this._dc = null;
-+        }
-+        if (this._encodingQueue) {
-+            this._encodingQueue.destroy();
-+            this._encodingQueue.removeAllListeners();
-+            // @ts-ignore
-+            this._encodingQueue = null;
-+        }
-+        if (!this.open) {
-+            return;
-+        }
-+        this._open = false;
-+        _super.prototype.emit.call(this, enums_1.ConnectionEventType.Close);
-+    };
-+    /** Allows user to send data. */
-+    DataConnection.prototype.send = function (data, chunked) {
-+        if (!this.open) {
-+            _super.prototype.emit.call(this, enums_1.ConnectionEventType.Error, new Error("Connection is not open. You should listen for the `open` event before sending messages."));
-+            return;
-+        }
-+        if (this.serialization === enums_1.SerializationType.JSON) {
-+            this._bufferedSend(this.stringify(data));
-+        }
-+        else if (this.serialization === enums_1.SerializationType.Binary ||
-+            this.serialization === enums_1.SerializationType.BinaryUTF8) {
-+            var blob = util_1.util.pack(data);
-+            if (!chunked && blob.size > util_1.util.chunkedMTU) {
-+                this._sendChunks(blob);
-+                return;
-+            }
-+            if (!util_1.util.supports.binaryBlob) {
-+                // We only do this if we really need to (e.g. blobs are not supported),
-+                // because this conversion is costly.
-+                this._encodingQueue.enque(blob);
-+            }
-+            else {
-+                this._bufferedSend(blob);
-+            }
-+        }
-+        else {
-+            this._bufferedSend(data);
-+        }
-+    };
-+    DataConnection.prototype._bufferedSend = function (msg) {
-+        if (this._buffering || !this._trySend(msg)) {
-+            this._buffer.push(msg);
-+            this._bufferSize = this._buffer.length;
-+        }
-+    };
-+    // Returns true if the send succeeds.
-+    DataConnection.prototype._trySend = function (msg) {
-+        var _this = this;
-+        if (!this.open) {
-+            return false;
-+        }
-+        if (this.dataChannel.bufferedAmount > DataConnection.MAX_BUFFERED_AMOUNT) {
-+            this._buffering = true;
-+            setTimeout(function () {
-+                _this._buffering = false;
-+                _this._tryBuffer();
-+            }, 50);
-+            return false;
-+        }
-+        try {
-+            this.dataChannel.send(msg);
-+        }
-+        catch (e) {
-+            logger_1.default.error("DC#:" + this.connectionId + " Error when sending:", e);
-+            this._buffering = true;
-+            this.close();
-+            return false;
-+        }
-+        return true;
-+    };
-+    // Try to send the first message in the buffer.
-+    DataConnection.prototype._tryBuffer = function () {
-+        if (!this.open) {
-+            return;
-+        }
-+        if (this._buffer.length === 0) {
-+            return;
-+        }
-+        var msg = this._buffer[0];
-+        if (this._trySend(msg)) {
-+            this._buffer.shift();
-+            this._bufferSize = this._buffer.length;
-+            this._tryBuffer();
-+        }
-+    };
-+    DataConnection.prototype._sendChunks = function (blob) {
-+        var blobs = util_1.util.chunk(blob);
-+        logger_1.default.log("DC#" + this.connectionId + " Try to send " + blobs.length + " chunks...");
-+        for (var _i = 0, blobs_1 = blobs; _i < blobs_1.length; _i++) {
-+            var blob_1 = blobs_1[_i];
-+            this.send(blob_1, true);
-+        }
-+    };
-+    DataConnection.prototype.handleMessage = function (message) {
-+        var payload = message.payload;
-+        switch (message.type) {
-+            case enums_1.ServerMessageType.Answer:
-+                this._negotiator.handleSDP(message.type, payload.sdp);
-+                break;
-+            case enums_1.ServerMessageType.Candidate:
-+                this._negotiator.handleCandidate(payload.candidate);
-+                break;
-+            default:
-+                logger_1.default.warn("Unrecognized message type:", message.type, "from peer:", this.peer);
-+                break;
-+        }
-+    };
-+    DataConnection.ID_PREFIX = "dc_";
-+    DataConnection.MAX_BUFFERED_AMOUNT = 8 * 1024 * 1024;
-+    return DataConnection;
-+}(baseconnection_1.BaseConnection));
-+exports.DataConnection = DataConnection;
-diff --git a/node_modules/peerjs/dist/encodingQueue.js b/node_modules/peerjs/dist/encodingQueue.js
-new file mode 100644
-index 0000000..c9ca6b5
---- /dev/null
-+++ b/node_modules/peerjs/dist/encodingQueue.js
-@@ -0,0 +1,88 @@
-+"use strict";
-+var __extends = (this && this.__extends) || (function () {
-+    var extendStatics = function (d, b) {
-+        extendStatics = Object.setPrototypeOf ||
-+            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
-+        return extendStatics(d, b);
-+    };
-+    return function (d, b) {
-+        if (typeof b !== "function" && b !== null)
-+            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
-+        extendStatics(d, b);
-+        function __() { this.constructor = d; }
-+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-+    };
-+})();
-+var __importDefault = (this && this.__importDefault) || function (mod) {
-+    return (mod && mod.__esModule) ? mod : { "default": mod };
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.EncodingQueue = void 0;
-+var eventemitter3_1 = require("eventemitter3");
-+var logger_1 = __importDefault(require("./logger"));
-+var EncodingQueue = /** @class */ (function (_super) {
-+    __extends(EncodingQueue, _super);
-+    function EncodingQueue() {
-+        var _this = _super.call(this) || this;
-+        _this.fileReader = new FileReader();
-+        _this._queue = [];
-+        _this._processing = false;
-+        _this.fileReader.onload = function (evt) {
-+            _this._processing = false;
-+            if (evt.target) {
-+                _this.emit('done', evt.target.result);
-+            }
-+            _this.doNextTask();
-+        };
-+        _this.fileReader.onerror = function (evt) {
-+            logger_1.default.error("EncodingQueue error:", evt);
-+            _this._processing = false;
-+            _this.destroy();
-+            _this.emit('error', evt);
-+        };
-+        return _this;
-+    }
-+    Object.defineProperty(EncodingQueue.prototype, "queue", {
-+        get: function () {
-+            return this._queue;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(EncodingQueue.prototype, "size", {
-+        get: function () {
-+            return this.queue.length;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(EncodingQueue.prototype, "processing", {
-+        get: function () {
-+            return this._processing;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    EncodingQueue.prototype.enque = function (blob) {
-+        this.queue.push(blob);
-+        if (this.processing)
-+            return;
-+        this.doNextTask();
-+    };
-+    EncodingQueue.prototype.destroy = function () {
-+        this.fileReader.abort();
-+        this._queue = [];
-+    };
-+    EncodingQueue.prototype.doNextTask = function () {
-+        if (this.size === 0)
-+            return;
-+        if (this.processing)
-+            return;
-+        this._processing = true;
-+        // @ts-ignore
-+        this.fileReader.readAsArrayBuffer(this.queue.shift());
-+    };
-+    return EncodingQueue;
-+}(eventemitter3_1.EventEmitter));
-+exports.EncodingQueue = EncodingQueue;
-diff --git a/node_modules/peerjs/dist/enums.js b/node_modules/peerjs/dist/enums.js
-new file mode 100644
-index 0000000..9e551a4
---- /dev/null
-+++ b/node_modules/peerjs/dist/enums.js
-@@ -0,0 +1,67 @@
-+"use strict";
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.ServerMessageType = exports.SocketEventType = exports.SerializationType = exports.PeerErrorType = exports.PeerEventType = exports.ConnectionType = exports.ConnectionEventType = void 0;
-+var ConnectionEventType;
-+(function (ConnectionEventType) {
-+    ConnectionEventType["Open"] = "open";
-+    ConnectionEventType["Stream"] = "stream";
-+    ConnectionEventType["Data"] = "data";
-+    ConnectionEventType["Close"] = "close";
-+    ConnectionEventType["Error"] = "error";
-+    ConnectionEventType["IceStateChanged"] = "iceStateChanged";
-+})(ConnectionEventType = exports.ConnectionEventType || (exports.ConnectionEventType = {}));
-+var ConnectionType;
-+(function (ConnectionType) {
-+    ConnectionType["Data"] = "data";
-+    ConnectionType["Media"] = "media";
-+})(ConnectionType = exports.ConnectionType || (exports.ConnectionType = {}));
-+var PeerEventType;
-+(function (PeerEventType) {
-+    PeerEventType["Open"] = "open";
-+    PeerEventType["Close"] = "close";
-+    PeerEventType["Connection"] = "connection";
-+    PeerEventType["Call"] = "call";
-+    PeerEventType["Disconnected"] = "disconnected";
-+    PeerEventType["Error"] = "error";
-+})(PeerEventType = exports.PeerEventType || (exports.PeerEventType = {}));
-+var PeerErrorType;
-+(function (PeerErrorType) {
-+    PeerErrorType["BrowserIncompatible"] = "browser-incompatible";
-+    PeerErrorType["Disconnected"] = "disconnected";
-+    PeerErrorType["InvalidID"] = "invalid-id";
-+    PeerErrorType["InvalidKey"] = "invalid-key";
-+    PeerErrorType["Network"] = "network";
-+    PeerErrorType["PeerUnavailable"] = "peer-unavailable";
-+    PeerErrorType["SslUnavailable"] = "ssl-unavailable";
-+    PeerErrorType["ServerError"] = "server-error";
-+    PeerErrorType["SocketError"] = "socket-error";
-+    PeerErrorType["SocketClosed"] = "socket-closed";
-+    PeerErrorType["UnavailableID"] = "unavailable-id";
-+    PeerErrorType["WebRTC"] = "webrtc";
-+})(PeerErrorType = exports.PeerErrorType || (exports.PeerErrorType = {}));
-+var SerializationType;
-+(function (SerializationType) {
-+    SerializationType["Binary"] = "binary";
-+    SerializationType["BinaryUTF8"] = "binary-utf8";
-+    SerializationType["JSON"] = "json";
-+})(SerializationType = exports.SerializationType || (exports.SerializationType = {}));
-+var SocketEventType;
-+(function (SocketEventType) {
-+    SocketEventType["Message"] = "message";
-+    SocketEventType["Disconnected"] = "disconnected";
-+    SocketEventType["Error"] = "error";
-+    SocketEventType["Close"] = "close";
-+})(SocketEventType = exports.SocketEventType || (exports.SocketEventType = {}));
-+var ServerMessageType;
-+(function (ServerMessageType) {
-+    ServerMessageType["Heartbeat"] = "HEARTBEAT";
-+    ServerMessageType["Candidate"] = "CANDIDATE";
-+    ServerMessageType["Offer"] = "OFFER";
-+    ServerMessageType["Answer"] = "ANSWER";
-+    ServerMessageType["Open"] = "OPEN";
-+    ServerMessageType["Error"] = "ERROR";
-+    ServerMessageType["IdTaken"] = "ID-TAKEN";
-+    ServerMessageType["InvalidKey"] = "INVALID-KEY";
-+    ServerMessageType["Leave"] = "LEAVE";
-+    ServerMessageType["Expire"] = "EXPIRE"; // The offer sent to a peer has expired without response.
-+})(ServerMessageType = exports.ServerMessageType || (exports.ServerMessageType = {}));
-diff --git a/node_modules/peerjs/dist/exports.js b/node_modules/peerjs/dist/exports.js
-new file mode 100644
-index 0000000..d6e2666
---- /dev/null
-+++ b/node_modules/peerjs/dist/exports.js
-@@ -0,0 +1,13 @@
-+"use strict";
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.peerjs = void 0;
-+var util_1 = require("./util");
-+var peer_1 = require("./peer");
-+exports.peerjs = {
-+    Peer: peer_1.Peer,
-+    util: util_1.util
-+};
-+exports.default = peer_1.Peer;
-+window.peerjs = exports.peerjs;
-+/** @deprecated Should use peerjs namespace */
-+window.Peer = peer_1.Peer;
-diff --git a/node_modules/peerjs/dist/index.js b/node_modules/peerjs/dist/index.js
-new file mode 100644
-index 0000000..e7d6ac1
---- /dev/null
-+++ b/node_modules/peerjs/dist/index.js
-@@ -0,0 +1,27 @@
-+"use strict";
-+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
-+    if (k2 === undefined) k2 = k;
-+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
-+}) : (function(o, m, k, k2) {
-+    if (k2 === undefined) k2 = k;
-+    o[k2] = m[k];
-+}));
-+var __exportStar = (this && this.__exportStar) || function(m, exports) {
-+    for (var p in m) if (p !== "default" && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+__exportStar(require("./adapter"), exports);
-+__exportStar(require("./api"), exports);
-+__exportStar(require("./baseconnection"), exports);
-+__exportStar(require("./dataconnection"), exports);
-+__exportStar(require("./encodingQueue"), exports);
-+__exportStar(require("./enums"), exports);
-+__exportStar(require("./exports"), exports);
-+__exportStar(require("./logger"), exports);
-+__exportStar(require("./mediaconnection"), exports);
-+__exportStar(require("./negotiator"), exports);
-+__exportStar(require("./peer"), exports);
-+__exportStar(require("./servermessage"), exports);
-+__exportStar(require("./socket"), exports);
-+__exportStar(require("./supports"), exports);
-+__exportStar(require("./util"), exports);
-diff --git a/node_modules/peerjs/dist/logger.js b/node_modules/peerjs/dist/logger.js
-new file mode 100644
-index 0000000..9a5e883
---- /dev/null
-+++ b/node_modules/peerjs/dist/logger.js
-@@ -0,0 +1,87 @@
-+"use strict";
-+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
-+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
-+        to[j] = from[i];
-+    return to;
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.LogLevel = void 0;
-+var LOG_PREFIX = 'PeerJS: ';
-+/*
-+Prints log messages depending on the debug level passed in. Defaults to 0.
-+0  Prints no logs.
-+1  Prints only errors.
-+2  Prints errors and warnings.
-+3  Prints all logs.
-+*/
-+var LogLevel;
-+(function (LogLevel) {
-+    LogLevel[LogLevel["Disabled"] = 0] = "Disabled";
-+    LogLevel[LogLevel["Errors"] = 1] = "Errors";
-+    LogLevel[LogLevel["Warnings"] = 2] = "Warnings";
-+    LogLevel[LogLevel["All"] = 3] = "All";
-+})(LogLevel = exports.LogLevel || (exports.LogLevel = {}));
-+var Logger = /** @class */ (function () {
-+    function Logger() {
-+        this._logLevel = LogLevel.Disabled;
-+    }
-+    Object.defineProperty(Logger.prototype, "logLevel", {
-+        get: function () { return this._logLevel; },
-+        set: function (logLevel) { this._logLevel = logLevel; },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Logger.prototype.log = function () {
-+        var args = [];
-+        for (var _i = 0; _i < arguments.length; _i++) {
-+            args[_i] = arguments[_i];
-+        }
-+        if (this._logLevel >= LogLevel.All) {
-+            this._print.apply(this, __spreadArray([LogLevel.All], args));
-+        }
-+    };
-+    Logger.prototype.warn = function () {
-+        var args = [];
-+        for (var _i = 0; _i < arguments.length; _i++) {
-+            args[_i] = arguments[_i];
-+        }
-+        if (this._logLevel >= LogLevel.Warnings) {
-+            this._print.apply(this, __spreadArray([LogLevel.Warnings], args));
-+        }
-+    };
-+    Logger.prototype.error = function () {
-+        var args = [];
-+        for (var _i = 0; _i < arguments.length; _i++) {
-+            args[_i] = arguments[_i];
-+        }
-+        if (this._logLevel >= LogLevel.Errors) {
-+            this._print.apply(this, __spreadArray([LogLevel.Errors], args));
-+        }
-+    };
-+    Logger.prototype.setLogFunction = function (fn) {
-+        this._print = fn;
-+    };
-+    Logger.prototype._print = function (logLevel) {
-+        var rest = [];
-+        for (var _i = 1; _i < arguments.length; _i++) {
-+            rest[_i - 1] = arguments[_i];
-+        }
-+        var copy = __spreadArray([LOG_PREFIX], rest);
-+        for (var i in copy) {
-+            if (copy[i] instanceof Error) {
-+                copy[i] = "(" + copy[i].name + ") " + copy[i].message;
-+            }
-+        }
-+        if (logLevel >= LogLevel.All) {
-+            console.log.apply(console, copy);
-+        }
-+        else if (logLevel >= LogLevel.Warnings) {
-+            console.warn.apply(console, __spreadArray(["WARNING"], copy));
-+        }
-+        else if (logLevel >= LogLevel.Errors) {
-+            console.error.apply(console, __spreadArray(["ERROR"], copy));
-+        }
-+    };
-+    return Logger;
-+}());
-+exports.default = new Logger();
-diff --git a/node_modules/peerjs/dist/mediaconnection.js b/node_modules/peerjs/dist/mediaconnection.js
-new file mode 100644
-index 0000000..2318160
---- /dev/null
-+++ b/node_modules/peerjs/dist/mediaconnection.js
-@@ -0,0 +1,148 @@
-+"use strict";
-+var __extends = (this && this.__extends) || (function () {
-+    var extendStatics = function (d, b) {
-+        extendStatics = Object.setPrototypeOf ||
-+            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
-+        return extendStatics(d, b);
-+    };
-+    return function (d, b) {
-+        if (typeof b !== "function" && b !== null)
-+            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
-+        extendStatics(d, b);
-+        function __() { this.constructor = d; }
-+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-+    };
-+})();
-+var __assign = (this && this.__assign) || function () {
-+    __assign = Object.assign || function(t) {
-+        for (var s, i = 1, n = arguments.length; i < n; i++) {
-+            s = arguments[i];
-+            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
-+                t[p] = s[p];
-+        }
-+        return t;
-+    };
-+    return __assign.apply(this, arguments);
-+};
-+var __importDefault = (this && this.__importDefault) || function (mod) {
-+    return (mod && mod.__esModule) ? mod : { "default": mod };
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.MediaConnection = void 0;
-+var util_1 = require("./util");
-+var logger_1 = __importDefault(require("./logger"));
-+var negotiator_1 = require("./negotiator");
-+var enums_1 = require("./enums");
-+var baseconnection_1 = require("./baseconnection");
-+/**
-+ * Wraps the streaming interface between two Peers.
-+ */
-+var MediaConnection = /** @class */ (function (_super) {
-+    __extends(MediaConnection, _super);
-+    function MediaConnection(peerId, provider, options) {
-+        var _this = _super.call(this, peerId, provider, options) || this;
-+        _this._localStream = _this.options._stream;
-+        _this.connectionId =
-+            _this.options.connectionId ||
-+                MediaConnection.ID_PREFIX + util_1.util.randomToken();
-+        _this._negotiator = new negotiator_1.Negotiator(_this);
-+        if (_this._localStream) {
-+            _this._negotiator.startConnection({
-+                _stream: _this._localStream,
-+                originator: true
-+            });
-+        }
-+        return _this;
-+    }
-+    Object.defineProperty(MediaConnection.prototype, "type", {
-+        get: function () {
-+            return enums_1.ConnectionType.Media;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(MediaConnection.prototype, "localStream", {
-+        get: function () { return this._localStream; },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(MediaConnection.prototype, "remoteStream", {
-+        get: function () { return this._remoteStream; },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    //   @ts-ignore
-+    MediaConnection.prototype.addStream = function (remoteStream) {
-+        logger_1.default.log("Receiving stream", remoteStream);
-+        this._remoteStream = remoteStream;
-+        _super.prototype.emit.call(this, enums_1.ConnectionEventType.Stream, remoteStream); // Should we call this `open`?
-+    };
-+    MediaConnection.prototype.handleMessage = function (message) {
-+        var type = message.type;
-+        var payload = message.payload;
-+        switch (message.type) {
-+            case enums_1.ServerMessageType.Answer:
-+                // Forward to negotiator
-+                this._negotiator.handleSDP(type, payload.sdp);
-+                this._open = true;
-+                break;
-+            case enums_1.ServerMessageType.Candidate:
-+                this._negotiator.handleCandidate(payload.candidate);
-+                break;
-+            default:
-+                logger_1.default.warn("Unrecognized message type:" + type + " from peer:" + this.peer);
-+                break;
-+        }
-+    };
-+    MediaConnection.prototype.answer = function (stream, options) {
-+        if (options === void 0) { options = {}; }
-+        if (this._localStream) {
-+            logger_1.default.warn("Local stream already exists on this MediaConnection. Are you answering a call twice?");
-+            return;
-+        }
-+        this._localStream = stream;
-+        if (options && options.sdpTransform) {
-+            this.options.sdpTransform = options.sdpTransform;
-+        }
-+        this._negotiator.startConnection(__assign(__assign({}, this.options._payload), { _stream: stream }));
-+        // Retrieve lost messages stored because PeerConnection not set up.
-+        var messages = this.provider._getMessages(this.connectionId);
-+        for (var _i = 0, messages_1 = messages; _i < messages_1.length; _i++) {
-+            var message = messages_1[_i];
-+            this.handleMessage(message);
-+        }
-+        this._open = true;
-+    };
-+    /**
-+     * Exposed functionality for users.
-+     */
-+    /** Allows user to close connection. */
-+    MediaConnection.prototype.close = function () {
-+        if (this._negotiator) {
-+            this._negotiator.cleanup();
-+            //   @ts-ignore
-+            this._negotiator = null;
-+        }
-+        //   @ts-ignore
-+        this._localStream = null;
-+        //   @ts-ignore
-+        this._remoteStream = null;
-+        if (this.provider) {
-+            this.provider._removeConnection(this);
-+            //   @ts-ignore
-+            this.provider = null;
-+        }
-+        if (this.options && this.options._stream) {
-+            this.options._stream = null;
-+        }
-+        if (!this.open) {
-+            return;
-+        }
-+        this._open = false;
-+        _super.prototype.emit.call(this, enums_1.ConnectionEventType.Close);
-+    };
-+    MediaConnection.ID_PREFIX = "mc_";
-+    return MediaConnection;
-+}(baseconnection_1.BaseConnection));
-+exports.MediaConnection = MediaConnection;
-diff --git a/node_modules/peerjs/dist/negotiator.js b/node_modules/peerjs/dist/negotiator.js
-new file mode 100644
-index 0000000..afd9687
---- /dev/null
-+++ b/node_modules/peerjs/dist/negotiator.js
-@@ -0,0 +1,385 @@
-+"use strict";
-+var __assign = (this && this.__assign) || function () {
-+    __assign = Object.assign || function(t) {
-+        for (var s, i = 1, n = arguments.length; i < n; i++) {
-+            s = arguments[i];
-+            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
-+                t[p] = s[p];
-+        }
-+        return t;
-+    };
-+    return __assign.apply(this, arguments);
-+};
-+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
-+    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
-+    return new (P || (P = Promise))(function (resolve, reject) {
-+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
-+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
-+        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
-+        step((generator = generator.apply(thisArg, _arguments || [])).next());
-+    });
-+};
-+var __generator = (this && this.__generator) || function (thisArg, body) {
-+    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
-+    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
-+    function verb(n) { return function (v) { return step([n, v]); }; }
-+    function step(op) {
-+        if (f) throw new TypeError("Generator is already executing.");
-+        while (_) try {
-+            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
-+            if (y = 0, t) op = [op[0] & 2, t.value];
-+            switch (op[0]) {
-+                case 0: case 1: t = op; break;
-+                case 4: _.label++; return { value: op[1], done: false };
-+                case 5: _.label++; y = op[1]; op = [0]; continue;
-+                case 7: op = _.ops.pop(); _.trys.pop(); continue;
-+                default:
-+                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
-+                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
-+                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
-+                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
-+                    if (t[2]) _.ops.pop();
-+                    _.trys.pop(); continue;
-+            }
-+            op = body.call(thisArg, _);
-+        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
-+        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
-+    }
-+};
-+var __importDefault = (this && this.__importDefault) || function (mod) {
-+    return (mod && mod.__esModule) ? mod : { "default": mod };
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.Negotiator = void 0;
-+var util_1 = require("./util");
-+var logger_1 = __importDefault(require("./logger"));
-+var enums_1 = require("./enums");
-+/**
-+ * Manages all negotiations between Peers.
-+ */
-+var Negotiator = /** @class */ (function () {
-+    function Negotiator(connection) {
-+        this.connection = connection;
-+    }
-+    /** Returns a PeerConnection object set up correctly (for data, media). */
-+    Negotiator.prototype.startConnection = function (options) {
-+        var peerConnection = this._startPeerConnection();
-+        // Set the connection's PC.
-+        this.connection.peerConnection = peerConnection;
-+        if (this.connection.type === enums_1.ConnectionType.Media && options._stream) {
-+            this._addTracksToConnection(options._stream, peerConnection);
-+        }
-+        // What do we need to do now?
-+        if (options.originator) {
-+            if (this.connection.type === enums_1.ConnectionType.Data) {
-+                var dataConnection = this.connection;
-+                var config = { ordered: !!options.reliable };
-+                var dataChannel = peerConnection.createDataChannel(dataConnection.label, config);
-+                dataConnection.initialize(dataChannel);
-+            }
-+            this._makeOffer();
-+        }
-+        else {
-+            this.handleSDP("OFFER", options.sdp);
-+        }
-+    };
-+    /** Start a PC. */
-+    Negotiator.prototype._startPeerConnection = function () {
-+        logger_1.default.log("Creating RTCPeerConnection.");
-+        var peerConnection = new RTCPeerConnection(this.connection.provider.options.config);
-+        this._setupListeners(peerConnection);
-+        return peerConnection;
-+    };
-+    /** Set up various WebRTC listeners. */
-+    Negotiator.prototype._setupListeners = function (peerConnection) {
-+        var _this = this;
-+        var peerId = this.connection.peer;
-+        var connectionId = this.connection.connectionId;
-+        var connectionType = this.connection.type;
-+        var provider = this.connection.provider;
-+        // ICE CANDIDATES.
-+        logger_1.default.log("Listening for ICE candidates.");
-+        peerConnection.onicecandidate = function (evt) {
-+            if (!evt.candidate || !evt.candidate.candidate)
-+                return;
-+            logger_1.default.log("Received ICE candidates for " + peerId + ":", evt.candidate);
-+            provider.socket.send({
-+                type: enums_1.ServerMessageType.Candidate,
-+                payload: {
-+                    candidate: evt.candidate,
-+                    type: connectionType,
-+                    connectionId: connectionId
-+                },
-+                dst: peerId
-+            });
-+        };
-+        peerConnection.oniceconnectionstatechange = function () {
-+            switch (peerConnection.iceConnectionState) {
-+                case "failed":
-+                    logger_1.default.log("iceConnectionState is failed, closing connections to " +
-+                        peerId);
-+                    _this.connection.emit(enums_1.ConnectionEventType.Error, new Error("Negotiation of connection to " + peerId + " failed."));
-+                    _this.connection.close();
-+                    break;
-+                case "closed":
-+                    logger_1.default.log("iceConnectionState is closed, closing connections to " +
-+                        peerId);
-+                    _this.connection.emit(enums_1.ConnectionEventType.Error, new Error("Connection to " + peerId + " closed."));
-+                    _this.connection.close();
-+                    break;
-+                case "disconnected":
-+                    logger_1.default.log("iceConnectionState changed to disconnected on the connection with " +
-+                        peerId);
-+                    break;
-+                case "completed":
-+                    peerConnection.onicecandidate = util_1.util.noop;
-+                    break;
-+            }
-+            _this.connection.emit(enums_1.ConnectionEventType.IceStateChanged, peerConnection.iceConnectionState);
-+        };
-+        // DATACONNECTION.
-+        logger_1.default.log("Listening for data channel");
-+        // Fired between offer and answer, so options should already be saved
-+        // in the options hash.
-+        peerConnection.ondatachannel = function (evt) {
-+            logger_1.default.log("Received data channel");
-+            var dataChannel = evt.channel;
-+            var connection = (provider.getConnection(peerId, connectionId));
-+            connection.initialize(dataChannel);
-+        };
-+        // MEDIACONNECTION.
-+        logger_1.default.log("Listening for remote stream");
-+        peerConnection.ontrack = function (evt) {
-+            logger_1.default.log("Received remote stream");
-+            var stream = evt.streams[0];
-+            var connection = provider.getConnection(peerId, connectionId);
-+            //   @ts-ignore
-+            if (connection.type === enums_1.ConnectionType.Media) {
-+                var mediaConnection = connection;
-+                _this._addStreamToMediaConnection(stream, mediaConnection);
-+            }
-+        };
-+    };
-+    Negotiator.prototype.cleanup = function () {
-+        logger_1.default.log("Cleaning up PeerConnection to " + this.connection.peer);
-+        var peerConnection = this.connection.peerConnection;
-+        if (!peerConnection) {
-+            return;
-+        }
-+        //   @ts-ignore
-+        this.connection.peerConnection = null;
-+        //unsubscribe from all PeerConnection's events
-+        peerConnection.onicecandidate = peerConnection.oniceconnectionstatechange = peerConnection.ondatachannel = peerConnection.ontrack = function () { };
-+        var peerConnectionNotClosed = peerConnection.signalingState !== "closed";
-+        var dataChannelNotClosed = false;
-+        if (this.connection.type === enums_1.ConnectionType.Data) {
-+            var dataConnection = this.connection;
-+            var dataChannel = dataConnection.dataChannel;
-+            if (dataChannel) {
-+                dataChannelNotClosed = !!dataChannel.readyState && dataChannel.readyState !== "closed";
-+            }
-+        }
-+        if (peerConnectionNotClosed || dataChannelNotClosed) {
-+            peerConnection.close();
-+        }
-+    };
-+    Negotiator.prototype._makeOffer = function () {
-+        return __awaiter(this, void 0, void 0, function () {
-+            var peerConnection, provider, offer, payload, dataConnection, err_2, err_1_1;
-+            return __generator(this, function (_a) {
-+                switch (_a.label) {
-+                    case 0:
-+                        peerConnection = this.connection.peerConnection;
-+                        provider = this.connection.provider;
-+                        _a.label = 1;
-+                    case 1:
-+                        _a.trys.push([1, 7, , 8]);
-+                        return [4 /*yield*/, peerConnection.createOffer(this.connection.options.constraints)];
-+                    case 2:
-+                        offer = _a.sent();
-+                        logger_1.default.log("Created offer.");
-+                        if (this.connection.options.sdpTransform && typeof this.connection.options.sdpTransform === 'function') {
-+                            offer.sdp = this.connection.options.sdpTransform(offer.sdp) || offer.sdp;
-+                        }
-+                        _a.label = 3;
-+                    case 3:
-+                        _a.trys.push([3, 5, , 6]);
-+                        return [4 /*yield*/, peerConnection.setLocalDescription(offer)];
-+                    case 4:
-+                        _a.sent();
-+                        logger_1.default.log("Set localDescription:", offer, "for:" + this.connection.peer);
-+                        payload = {
-+                            sdp: offer,
-+                            type: this.connection.type,
-+                            connectionId: this.connection.connectionId,
-+                            metadata: this.connection.metadata,
-+                            browser: util_1.util.browser
-+                        };
-+                        if (this.connection.type === enums_1.ConnectionType.Data) {
-+                            dataConnection = this.connection;
-+                            payload = __assign(__assign({}, payload), { label: dataConnection.label, reliable: dataConnection.reliable, serialization: dataConnection.serialization });
-+                        }
-+                        provider.socket.send({
-+                            type: enums_1.ServerMessageType.Offer,
-+                            payload: payload,
-+                            dst: this.connection.peer
-+                        });
-+                        return [3 /*break*/, 6];
-+                    case 5:
-+                        err_2 = _a.sent();
-+                        // TODO: investigate why _makeOffer is being called from the answer
-+                        if (err_2 !=
-+                            "OperationError: Failed to set local offer sdp: Called in wrong state: kHaveRemoteOffer") {
-+                            provider.emitError(enums_1.PeerErrorType.WebRTC, err_2);
-+                            logger_1.default.log("Failed to setLocalDescription, ", err_2);
-+                        }
-+                        return [3 /*break*/, 6];
-+                    case 6: return [3 /*break*/, 8];
-+                    case 7:
-+                        err_1_1 = _a.sent();
-+                        provider.emitError(enums_1.PeerErrorType.WebRTC, err_1_1);
-+                        logger_1.default.log("Failed to createOffer, ", err_1_1);
-+                        return [3 /*break*/, 8];
-+                    case 8: return [2 /*return*/];
-+                }
-+            });
-+        });
-+    };
-+    Negotiator.prototype._makeAnswer = function () {
-+        return __awaiter(this, void 0, void 0, function () {
-+            var peerConnection, provider, answer, err_3, err_1_2;
-+            return __generator(this, function (_a) {
-+                switch (_a.label) {
-+                    case 0:
-+                        peerConnection = this.connection.peerConnection;
-+                        provider = this.connection.provider;
-+                        _a.label = 1;
-+                    case 1:
-+                        _a.trys.push([1, 7, , 8]);
-+                        return [4 /*yield*/, peerConnection.createAnswer()];
-+                    case 2:
-+                        answer = _a.sent();
-+                        logger_1.default.log("Created answer.");
-+                        if (this.connection.options.sdpTransform && typeof this.connection.options.sdpTransform === 'function') {
-+                            answer.sdp = this.connection.options.sdpTransform(answer.sdp) || answer.sdp;
-+                        }
-+                        _a.label = 3;
-+                    case 3:
-+                        _a.trys.push([3, 5, , 6]);
-+                        return [4 /*yield*/, peerConnection.setLocalDescription(answer)];
-+                    case 4:
-+                        _a.sent();
-+                        logger_1.default.log("Set localDescription:", answer, "for:" + this.connection.peer);
-+                        provider.socket.send({
-+                            type: enums_1.ServerMessageType.Answer,
-+                            payload: {
-+                                sdp: answer,
-+                                type: this.connection.type,
-+                                connectionId: this.connection.connectionId,
-+                                browser: util_1.util.browser
-+                            },
-+                            dst: this.connection.peer
-+                        });
-+                        return [3 /*break*/, 6];
-+                    case 5:
-+                        err_3 = _a.sent();
-+                        provider.emitError(enums_1.PeerErrorType.WebRTC, err_3);
-+                        logger_1.default.log("Failed to setLocalDescription, ", err_3);
-+                        return [3 /*break*/, 6];
-+                    case 6: return [3 /*break*/, 8];
-+                    case 7:
-+                        err_1_2 = _a.sent();
-+                        provider.emitError(enums_1.PeerErrorType.WebRTC, err_1_2);
-+                        logger_1.default.log("Failed to create answer, ", err_1_2);
-+                        return [3 /*break*/, 8];
-+                    case 8: return [2 /*return*/];
-+                }
-+            });
-+        });
-+    };
-+    /** Handle an SDP. */
-+    Negotiator.prototype.handleSDP = function (type, sdp) {
-+        return __awaiter(this, void 0, void 0, function () {
-+            var peerConnection, provider, self, err_4;
-+            return __generator(this, function (_a) {
-+                switch (_a.label) {
-+                    case 0:
-+                        sdp = new RTCSessionDescription(sdp);
-+                        peerConnection = this.connection.peerConnection;
-+                        provider = this.connection.provider;
-+                        logger_1.default.log("Setting remote description", sdp);
-+                        self = this;
-+                        _a.label = 1;
-+                    case 1:
-+                        _a.trys.push([1, 5, , 6]);
-+                        return [4 /*yield*/, peerConnection.setRemoteDescription(sdp)];
-+                    case 2:
-+                        _a.sent();
-+                        logger_1.default.log("Set remoteDescription:" + type + " for:" + this.connection.peer);
-+                        if (!(type === "OFFER")) return [3 /*break*/, 4];
-+                        return [4 /*yield*/, self._makeAnswer()];
-+                    case 3:
-+                        _a.sent();
-+                        _a.label = 4;
-+                    case 4: return [3 /*break*/, 6];
-+                    case 5:
-+                        err_4 = _a.sent();
-+                        provider.emitError(enums_1.PeerErrorType.WebRTC, err_4);
-+                        logger_1.default.log("Failed to setRemoteDescription, ", err_4);
-+                        return [3 /*break*/, 6];
-+                    case 6: return [2 /*return*/];
-+                }
-+            });
-+        });
-+    };
-+    /** Handle a candidate. */
-+    Negotiator.prototype.handleCandidate = function (ice) {
-+        return __awaiter(this, void 0, void 0, function () {
-+            var candidate, sdpMLineIndex, sdpMid, peerConnection, provider, err_5;
-+            return __generator(this, function (_a) {
-+                switch (_a.label) {
-+                    case 0:
-+                        logger_1.default.log("handleCandidate:", ice);
-+                        candidate = ice.candidate;
-+                        sdpMLineIndex = ice.sdpMLineIndex;
-+                        sdpMid = ice.sdpMid;
-+                        peerConnection = this.connection.peerConnection;
-+                        provider = this.connection.provider;
-+                        _a.label = 1;
-+                    case 1:
-+                        _a.trys.push([1, 3, , 4]);
-+                        return [4 /*yield*/, peerConnection.addIceCandidate(new RTCIceCandidate({
-+                                sdpMid: sdpMid,
-+                                sdpMLineIndex: sdpMLineIndex,
-+                                candidate: candidate
-+                            }))];
-+                    case 2:
-+                        _a.sent();
-+                        logger_1.default.log("Added ICE candidate for:" + this.connection.peer);
-+                        return [3 /*break*/, 4];
-+                    case 3:
-+                        err_5 = _a.sent();
-+                        provider.emitError(enums_1.PeerErrorType.WebRTC, err_5);
-+                        logger_1.default.log("Failed to handleCandidate, ", err_5);
-+                        return [3 /*break*/, 4];
-+                    case 4: return [2 /*return*/];
-+                }
-+            });
-+        });
-+    };
-+    Negotiator.prototype._addTracksToConnection = function (stream, peerConnection) {
-+        logger_1.default.log("add tracks from stream " + stream.id + " to peer connection");
-+        if (!peerConnection.addTrack) {
-+            return logger_1.default.error("Your browser does't support RTCPeerConnection#addTrack. Ignored.");
-+        }
-+        stream.getTracks().forEach(function (track) {
-+            peerConnection.addTrack(track, stream);
-+        });
-+    };
-+    Negotiator.prototype._addStreamToMediaConnection = function (stream, mediaConnection) {
-+        logger_1.default.log("add stream " + stream.id + " to media connection " + mediaConnection.connectionId);
-+        mediaConnection.addStream(stream);
-+    };
-+    return Negotiator;
-+}());
-+exports.Negotiator = Negotiator;
-diff --git a/node_modules/peerjs/dist/peer.js b/node_modules/peerjs/dist/peer.js
-new file mode 100644
-index 0000000..8928729
---- /dev/null
-+++ b/node_modules/peerjs/dist/peer.js
-@@ -0,0 +1,519 @@
-+"use strict";
-+var __extends = (this && this.__extends) || (function () {
-+    var extendStatics = function (d, b) {
-+        extendStatics = Object.setPrototypeOf ||
-+            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
-+        return extendStatics(d, b);
-+    };
-+    return function (d, b) {
-+        if (typeof b !== "function" && b !== null)
-+            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
-+        extendStatics(d, b);
-+        function __() { this.constructor = d; }
-+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-+    };
-+})();
-+var __assign = (this && this.__assign) || function () {
-+    __assign = Object.assign || function(t) {
-+        for (var s, i = 1, n = arguments.length; i < n; i++) {
-+            s = arguments[i];
-+            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
-+                t[p] = s[p];
-+        }
-+        return t;
-+    };
-+    return __assign.apply(this, arguments);
-+};
-+var __importDefault = (this && this.__importDefault) || function (mod) {
-+    return (mod && mod.__esModule) ? mod : { "default": mod };
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.Peer = void 0;
-+var eventemitter3_1 = require("eventemitter3");
-+var util_1 = require("./util");
-+var logger_1 = __importDefault(require("./logger"));
-+var socket_1 = require("./socket");
-+var mediaconnection_1 = require("./mediaconnection");
-+var dataconnection_1 = require("./dataconnection");
-+var enums_1 = require("./enums");
-+var api_1 = require("./api");
-+var PeerOptions = /** @class */ (function () {
-+    function PeerOptions() {
-+    }
-+    return PeerOptions;
-+}());
-+/**
-+ * A peer who can initiate connections with other peers.
-+ */
-+var Peer = /** @class */ (function (_super) {
-+    __extends(Peer, _super);
-+    function Peer(id, options) {
-+        var _this = _super.call(this) || this;
-+        _this._id = null;
-+        _this._lastServerId = null;
-+        // States.
-+        _this._destroyed = false; // Connections have been killed
-+        _this._disconnected = false; // Connection to PeerServer killed but P2P connections still active
-+        _this._open = false; // Sockets and such are not yet open.
-+        _this._connections = new Map(); // All connections for this peer.
-+        _this._lostMessages = new Map(); // src => [list of messages]
-+        var userId;
-+        // Deal with overloading
-+        if (id && id.constructor == Object) {
-+            options = id;
-+        }
-+        else if (id) {
-+            userId = id.toString();
-+        }
-+        // Configurize options
-+        options = __assign({ debug: 0, host: util_1.util.CLOUD_HOST, port: util_1.util.CLOUD_PORT, path: "/", key: Peer.DEFAULT_KEY, token: util_1.util.randomToken(), config: util_1.util.defaultConfig }, options);
-+        _this._options = options;
-+        // Detect relative URL host.
-+        if (_this._options.host === "/") {
-+            _this._options.host = window.location.hostname;
-+        }
-+        // Set path correctly.
-+        if (_this._options.path) {
-+            if (_this._options.path[0] !== "/") {
-+                _this._options.path = "/" + _this._options.path;
-+            }
-+            if (_this._options.path[_this._options.path.length - 1] !== "/") {
-+                _this._options.path += "/";
-+            }
-+        }
-+        // Set whether we use SSL to same as current host
-+        if (_this._options.secure === undefined && _this._options.host !== util_1.util.CLOUD_HOST) {
-+            _this._options.secure = util_1.util.isSecure();
-+        }
-+        else if (_this._options.host == util_1.util.CLOUD_HOST) {
-+            _this._options.secure = true;
-+        }
-+        // Set a custom log function if present
-+        if (_this._options.logFunction) {
-+            logger_1.default.setLogFunction(_this._options.logFunction);
-+        }
-+        logger_1.default.logLevel = _this._options.debug || 0;
-+        _this._api = new api_1.API(options);
-+        _this._socket = _this._createServerConnection();
-+        // Sanity checks
-+        // Ensure WebRTC supported
-+        if (!util_1.util.supports.audioVideo && !util_1.util.supports.data) {
-+            _this._delayedAbort(enums_1.PeerErrorType.BrowserIncompatible, "The current browser does not support WebRTC");
-+            return _this;
-+        }
-+        // Ensure alphanumeric id
-+        if (!!userId && !util_1.util.validateId(userId)) {
-+            _this._delayedAbort(enums_1.PeerErrorType.InvalidID, "ID \"" + userId + "\" is invalid");
-+            return _this;
-+        }
-+        if (userId) {
-+            _this._initialize(userId);
-+        }
-+        else {
-+            _this._api.retrieveId()
-+                .then(function (id) { return _this._initialize(id); })
-+                .catch(function (error) { return _this._abort(enums_1.PeerErrorType.ServerError, error); });
-+        }
-+        return _this;
-+    }
-+    Object.defineProperty(Peer.prototype, "id", {
-+        get: function () {
-+            return this._id;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(Peer.prototype, "options", {
-+        get: function () {
-+            return this._options;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(Peer.prototype, "open", {
-+        get: function () {
-+            return this._open;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(Peer.prototype, "socket", {
-+        get: function () {
-+            return this._socket;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(Peer.prototype, "connections", {
-+        /**
-+         * @deprecated
-+         * Return type will change from Object to Map<string,[]>
-+         */
-+        get: function () {
-+            var plainConnections = Object.create(null);
-+            //   @ts-ignore
-+            for (var _i = 0, _a = this._connections; _i < _a.length; _i++) {
-+                var _b = _a[_i], k = _b[0], v = _b[1];
-+                plainConnections[k] = v;
-+            }
-+            return plainConnections;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(Peer.prototype, "destroyed", {
-+        get: function () {
-+            return this._destroyed;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Object.defineProperty(Peer.prototype, "disconnected", {
-+        get: function () {
-+            return this._disconnected;
-+        },
-+        enumerable: false,
-+        configurable: true
-+    });
-+    Peer.prototype._createServerConnection = function () {
-+        var _this = this;
-+        var socket = new socket_1.Socket(this._options.secure, this._options.host, this._options.port, this._options.path, this._options.key, this._options.pingInterval);
-+        socket.on(enums_1.SocketEventType.Message, function (data) {
-+            _this._handleMessage(data);
-+        });
-+        socket.on(enums_1.SocketEventType.Error, function (error) {
-+            _this._abort(enums_1.PeerErrorType.SocketError, error);
-+        });
-+        socket.on(enums_1.SocketEventType.Disconnected, function () {
-+            if (_this.disconnected) {
-+                return;
-+            }
-+            _this.emitError(enums_1.PeerErrorType.Network, "Lost connection to server.");
-+            _this.disconnect();
-+        });
-+        socket.on(enums_1.SocketEventType.Close, function () {
-+            if (_this.disconnected) {
-+                return;
-+            }
-+            _this._abort(enums_1.PeerErrorType.SocketClosed, "Underlying socket is already closed.");
-+        });
-+        return socket;
-+    };
-+    /** Initialize a connection with the server. */
-+    Peer.prototype._initialize = function (id) {
-+        this._id = id;
-+        this.socket.start(id, this._options.token);
-+    };
-+    /** Handles messages from the server. */
-+    Peer.prototype._handleMessage = function (message) {
-+        var type = message.type;
-+        var payload = message.payload;
-+        var peerId = message.src;
-+        switch (type) {
-+            case enums_1.ServerMessageType.Open: // The connection to the server is open.
-+                this._lastServerId = this.id;
-+                this._open = true;
-+                this.emit(enums_1.PeerEventType.Open, this.id);
-+                break;
-+            case enums_1.ServerMessageType.Error: // Server error.
-+                this._abort(enums_1.PeerErrorType.ServerError, payload.msg);
-+                break;
-+            case enums_1.ServerMessageType.IdTaken: // The selected ID is taken.
-+                this._abort(enums_1.PeerErrorType.UnavailableID, "ID \"" + this.id + "\" is taken");
-+                break;
-+            case enums_1.ServerMessageType.InvalidKey: // The given API key cannot be found.
-+                this._abort(enums_1.PeerErrorType.InvalidKey, "API KEY \"" + this._options.key + "\" is invalid");
-+                break;
-+            case enums_1.ServerMessageType.Leave: // Another peer has closed its connection to this peer.
-+                logger_1.default.log("Received leave message from " + peerId);
-+                this._cleanupPeer(peerId);
-+                this._connections.delete(peerId);
-+                break;
-+            case enums_1.ServerMessageType.Expire: // The offer sent to a peer has expired without response.
-+                this.emitError(enums_1.PeerErrorType.PeerUnavailable, "Could not connect to peer " + peerId);
-+                break;
-+            case enums_1.ServerMessageType.Offer: {
-+                // we should consider switching this to CALL/CONNECT, but this is the least breaking option.
-+                var connectionId = payload.connectionId;
-+                var connection = this.getConnection(peerId, connectionId);
-+                if (connection) {
-+                    connection.close();
-+                    logger_1.default.warn("Offer received for existing Connection ID:" + connectionId);
-+                }
-+                // Create a new connection.
-+                if (payload.type === enums_1.ConnectionType.Media) {
-+                    connection = new mediaconnection_1.MediaConnection(peerId, this, {
-+                        connectionId: connectionId,
-+                        _payload: payload,
-+                        metadata: payload.metadata
-+                    });
-+                    this._addConnection(peerId, connection);
-+                    this.emit(enums_1.PeerEventType.Call, connection);
-+                }
-+                else if (payload.type === enums_1.ConnectionType.Data) {
-+                    connection = new dataconnection_1.DataConnection(peerId, this, {
-+                        connectionId: connectionId,
-+                        _payload: payload,
-+                        metadata: payload.metadata,
-+                        label: payload.label,
-+                        serialization: payload.serialization,
-+                        reliable: payload.reliable
-+                    });
-+                    this._addConnection(peerId, connection);
-+                    this.emit(enums_1.PeerEventType.Connection, connection);
-+                }
-+                else {
-+                    logger_1.default.warn("Received malformed connection type:" + payload.type);
-+                    return;
-+                }
-+                // Find messages.
-+                var messages = this._getMessages(connectionId);
-+                for (var _i = 0, messages_1 = messages; _i < messages_1.length; _i++) {
-+                    var message_1 = messages_1[_i];
-+                    connection.handleMessage(message_1);
-+                }
-+                break;
-+            }
-+            default: {
-+                if (!payload) {
-+                    logger_1.default.warn("You received a malformed message from " + peerId + " of type " + type);
-+                    return;
-+                }
-+                var connectionId = payload.connectionId;
-+                var connection = this.getConnection(peerId, connectionId);
-+                if (connection && connection.peerConnection) {
-+                    // Pass it on.
-+                    connection.handleMessage(message);
-+                }
-+                else if (connectionId) {
-+                    // Store for possible later use
-+                    this._storeMessage(connectionId, message);
-+                }
-+                else {
-+                    logger_1.default.warn("You received an unrecognized message:", message);
-+                }
-+                break;
-+            }
-+        }
-+    };
-+    /** Stores messages without a set up connection, to be claimed later. */
-+    Peer.prototype._storeMessage = function (connectionId, message) {
-+        if (!this._lostMessages.has(connectionId)) {
-+            this._lostMessages.set(connectionId, []);
-+        }
-+        //   @ts-ignore
-+        this._lostMessages.get(connectionId).push(message);
-+    };
-+    /** Retrieve messages from lost message store */
-+    //TODO Change it to private
-+    Peer.prototype._getMessages = function (connectionId) {
-+        var messages = this._lostMessages.get(connectionId);
-+        if (messages) {
-+            this._lostMessages.delete(connectionId);
-+            return messages;
-+        }
-+        return [];
-+    };
-+    /**
-+     * Returns a DataConnection to the specified peer. See documentation for a
-+     * complete list of options.
-+     */
-+    Peer.prototype.connect = function (peer, options) {
-+        if (options === void 0) { options = {}; }
-+        if (this.disconnected) {
-+            logger_1.default.warn("You cannot connect to a new Peer because you called " +
-+                ".disconnect() on this Peer and ended your connection with the " +
-+                "server. You can create a new Peer to reconnect, or call reconnect " +
-+                "on this peer if you believe its ID to still be available.");
-+            this.emitError(enums_1.PeerErrorType.Disconnected, "Cannot connect to new Peer after disconnecting from server.");
-+            //   @ts-ignore
-+            return;
-+        }
-+        var dataConnection = new dataconnection_1.DataConnection(peer, this, options);
-+        this._addConnection(peer, dataConnection);
-+        return dataConnection;
-+    };
-+    /**
-+     * Returns a MediaConnection to the specified peer. See documentation for a
-+     * complete list of options.
-+     */
-+    Peer.prototype.call = function (peer, stream, options) {
-+        if (options === void 0) { options = {}; }
-+        if (this.disconnected) {
-+            logger_1.default.warn("You cannot connect to a new Peer because you called " +
-+                ".disconnect() on this Peer and ended your connection with the " +
-+                "server. You can create a new Peer to reconnect.");
-+            this.emitError(enums_1.PeerErrorType.Disconnected, "Cannot connect to new Peer after disconnecting from server.");
-+            //   @ts-ignore
-+            return;
-+        }
-+        if (!stream) {
-+            logger_1.default.error("To call a peer, you must provide a stream from your browser's `getUserMedia`.");
-+            //   @ts-ignore
-+            return;
-+        }
-+        options._stream = stream;
-+        var mediaConnection = new mediaconnection_1.MediaConnection(peer, this, options);
-+        this._addConnection(peer, mediaConnection);
-+        return mediaConnection;
-+    };
-+    /** Add a data/media connection to this peer. */
-+    Peer.prototype._addConnection = function (peerId, connection) {
-+        logger_1.default.log("add connection " + connection.type + ":" + connection.connectionId + " to peerId:" + peerId);
-+        if (!this._connections.has(peerId)) {
-+            this._connections.set(peerId, []);
-+        }
-+        //   @ts-ignore
-+        this._connections.get(peerId).push(connection);
-+    };
-+    //TODO should be private
-+    Peer.prototype._removeConnection = function (connection) {
-+        var connections = this._connections.get(connection.peer);
-+        if (connections) {
-+            var index = connections.indexOf(connection);
-+            if (index !== -1) {
-+                connections.splice(index, 1);
-+            }
-+        }
-+        //remove from lost messages
-+        this._lostMessages.delete(connection.connectionId);
-+    };
-+    /** Retrieve a data/media connection for this peer. */
-+    Peer.prototype.getConnection = function (peerId, connectionId) {
-+        var connections = this._connections.get(peerId);
-+        if (!connections) {
-+            return null;
-+        }
-+        for (var _i = 0, connections_1 = connections; _i < connections_1.length; _i++) {
-+            var connection = connections_1[_i];
-+            if (connection.connectionId === connectionId) {
-+                return connection;
-+            }
-+        }
-+        return null;
-+    };
-+    Peer.prototype._delayedAbort = function (type, message) {
-+        var _this = this;
-+        setTimeout(function () {
-+            _this._abort(type, message);
-+        }, 0);
-+    };
-+    /**
-+     * Emits an error message and destroys the Peer.
-+     * The Peer is not destroyed if it's in a disconnected state, in which case
-+     * it retains its disconnected state and its existing connections.
-+     */
-+    Peer.prototype._abort = function (type, message) {
-+        logger_1.default.error("Aborting!");
-+        this.emitError(type, message);
-+        if (!this._lastServerId) {
-+            this.destroy();
-+        }
-+        else {
-+            this.disconnect();
-+        }
-+    };
-+    /** Emits a typed error message. */
-+    Peer.prototype.emitError = function (type, err) {
-+        logger_1.default.error("Error:", err);
-+        var error;
-+        if (typeof err === "string") {
-+            error = new Error(err);
-+        }
-+        else {
-+            error = err;
-+        }
-+        error.type = type;
-+        this.emit(enums_1.PeerEventType.Error, error);
-+    };
-+    /**
-+     * Destroys the Peer: closes all active connections as well as the connection
-+     *  to the server.
-+     * Warning: The peer can no longer create or accept connections after being
-+     *  destroyed.
-+     */
-+    Peer.prototype.destroy = function () {
-+        if (this.destroyed) {
-+            return;
-+        }
-+        logger_1.default.log("Destroy peer with ID:" + this.id);
-+        this.disconnect();
-+        this._cleanup();
-+        this._destroyed = true;
-+        this.emit(enums_1.PeerEventType.Close);
-+    };
-+    /** Disconnects every connection on this peer. */
-+    Peer.prototype._cleanup = function () {
-+        //   @ts-ignore
-+        for (var _i = 0, _a = this._connections.keys(); _i < _a.length; _i++) {
-+            var peerId = _a[_i];
-+            this._cleanupPeer(peerId);
-+            this._connections.delete(peerId);
-+        }
-+        this.socket.removeAllListeners();
-+    };
-+    /** Closes all connections to this peer. */
-+    Peer.prototype._cleanupPeer = function (peerId) {
-+        var connections = this._connections.get(peerId);
-+        if (!connections)
-+            return;
-+        for (var _i = 0, connections_2 = connections; _i < connections_2.length; _i++) {
-+            var connection = connections_2[_i];
-+            connection.close();
-+        }
-+    };
-+    /**
-+     * Disconnects the Peer's connection to the PeerServer. Does not close any
-+     *  active connections.
-+     * Warning: The peer can no longer create or accept connections after being
-+     *  disconnected. It also cannot reconnect to the server.
-+     */
-+    Peer.prototype.disconnect = function () {
-+        if (this.disconnected) {
-+            return;
-+        }
-+        var currentId = this.id;
-+        logger_1.default.log("Disconnect peer with ID:" + currentId);
-+        this._disconnected = true;
-+        this._open = false;
-+        this.socket.close();
-+        this._lastServerId = currentId;
-+        this._id = null;
-+        this.emit(enums_1.PeerEventType.Disconnected, currentId);
-+    };
-+    /** Attempts to reconnect with the same ID. */
-+    Peer.prototype.reconnect = function () {
-+        if (this.disconnected && !this.destroyed) {
-+            logger_1.default.log("Attempting reconnection to server with ID " + this._lastServerId);
-+            this._disconnected = false;
-+            this._initialize(this._lastServerId);
-+        }
-+        else if (this.destroyed) {
-+            throw new Error("This peer cannot reconnect to the server. It has already been destroyed.");
-+        }
-+        else if (!this.disconnected && !this.open) {
-+            // Do nothing. We're still connecting the first time.
-+            logger_1.default.error("In a hurry? We're still trying to make the initial connection!");
-+        }
-+        else {
-+            throw new Error("Peer " + this.id + " cannot reconnect because it is not disconnected from the server!");
-+        }
-+    };
-+    /**
-+     * Get a list of available peer IDs. If you're running your own server, you'll
-+     * want to set allow_discovery: true in the PeerServer options. If you're using
-+     * the cloud server, email team@peerjs.com to get the functionality enabled for
-+     * your key.
-+     */
-+    Peer.prototype.listAllPeers = function (cb) {
-+        var _this = this;
-+        if (cb === void 0) { cb = function (_) { }; }
-+        this._api.listAllPeers()
-+            .then(function (peers) { return cb(peers); })
-+            .catch(function (error) { return _this._abort(enums_1.PeerErrorType.ServerError, error); });
-+    };
-+    Peer.DEFAULT_KEY = "peerjs";
-+    return Peer;
-+}(eventemitter3_1.EventEmitter));
-+exports.Peer = Peer;
-diff --git a/node_modules/peerjs/dist/peerjs.js b/node_modules/peerjs/dist/peerjs.js
-deleted file mode 100644
-index b902845..0000000
---- a/node_modules/peerjs/dist/peerjs.js
-+++ /dev/null
-@@ -1,10318 +0,0 @@
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--
--function Packer () {
--  this.bufferBuilder = new BufferBuilder();
--}
--
--Packer.prototype.getBuffer = function () {
--  return this.bufferBuilder.getBuffer();
--};
--
--Packer.prototype.pack = function (value) {
--  var type = typeof (value);
--  if (type === 'string') {
--    this.pack_string(value);
--  } else if (type === 'number') {
--    if (Math.floor(value) === value) {
--      this.pack_integer(value);
--    } else {
--      this.pack_double(value);
--    }
--  } else if (type === 'boolean') {
--    if (value === true) {
--      this.bufferBuilder.append(0xc3);
--    } else if (value === false) {
--      this.bufferBuilder.append(0xc2);
--    }
--  } else if (type === 'undefined') {
--    this.bufferBuilder.append(0xc0);
--  } else if (type === 'object') {
--    if (value === null) {
--      this.bufferBuilder.append(0xc0);
--    } else {
--      var constructor = value.constructor;
--      if (constructor == Array) {
--        this.pack_array(value);
--      } else if (constructor == Blob || constructor == File || value instanceof Blob || value instanceof File) {
--        this.pack_bin(value);
--      } else if (constructor == ArrayBuffer) {
--        if (binaryFeatures.useArrayBufferView) {
--          this.pack_bin(new Uint8Array(value));
--        } else {
--          this.pack_bin(value);
--        }
--      } else if ('BYTES_PER_ELEMENT' in value) {
--        if (binaryFeatures.useArrayBufferView) {
--          this.pack_bin(new Uint8Array(value.buffer));
--        } else {
--          this.pack_bin(value.buffer);
--        }
--      } else if ((constructor == Object) || (constructor.toString().startsWith('class'))) {
--        this.pack_object(value);
--      } else if (constructor == Date) {
--        this.pack_string(value.toString());
--      } else if (typeof value.toBinaryPack === 'function') {
--        this.bufferBuilder.append(value.toBinaryPack());
--      } else {
--        throw new Error('Type "' + constructor.toString() + '" not yet supported');
--      }
--    }
--  } else {
--    throw new Error('Type "' + type + '" not yet supported');
--  }
--  this.bufferBuilder.flush();
--};
--
--Packer.prototype.pack_bin = function (blob) {
--  var length = blob.length || blob.byteLength || blob.size;
--  if (length <= 0x0f) {
--    this.pack_uint8(0xa0 + length);
--  } else if (length <= 0xffff) {
--    this.bufferBuilder.append(0xda);
--    this.pack_uint16(length);
--  } else if (length <= 0xffffffff) {
--    this.bufferBuilder.append(0xdb);
--    this.pack_uint32(length);
--  } else {
--    throw new Error('Invalid length');
--  }
--  this.bufferBuilder.append(blob);
--};
--
--Packer.prototype.pack_string = function (str) {
--  var length = utf8Length(str);
--
--  if (length <= 0x0f) {
--    this.pack_uint8(0xb0 + length);
--  } else if (length <= 0xffff) {
--    this.bufferBuilder.append(0xd8);
--    this.pack_uint16(length);
--  } else if (length <= 0xffffffff) {
--    this.bufferBuilder.append(0xd9);
--    this.pack_uint32(length);
--  } else {
--    throw new Error('Invalid length');
--  }
--  this.bufferBuilder.append(str);
--};
--
--Packer.prototype.pack_array = function (ary) {
--  var length = ary.length;
--  if (length <= 0x0f) {
--    this.pack_uint8(0x90 + length);
--  } else if (length <= 0xffff) {
--    this.bufferBuilder.append(0xdc);
--    this.pack_uint16(length);
--  } else if (length <= 0xffffffff) {
--    this.bufferBuilder.append(0xdd);
--    this.pack_uint32(length);
--  } else {
--    throw new Error('Invalid length');
--  }
--  for (var i = 0; i < length; i++) {
--    this.pack(ary[i]);
--  }
--};
--
--Packer.prototype.pack_integer = function (num) {
--  if (num >= -0x20 && num <= 0x7f) {
--    this.bufferBuilder.append(num & 0xff);
--  } else if (num >= 0x00 && num <= 0xff) {
--    this.bufferBuilder.append(0xcc);
--    this.pack_uint8(num);
--  } else if (num >= -0x80 && num <= 0x7f) {
--    this.bufferBuilder.append(0xd0);
--    this.pack_int8(num);
--  } else if (num >= 0x0000 && num <= 0xffff) {
--    this.bufferBuilder.append(0xcd);
--    this.pack_uint16(num);
--  } else if (num >= -0x8000 && num <= 0x7fff) {
--    this.bufferBuilder.append(0xd1);
--    this.pack_int16(num);
--  } else if (num >= 0x00000000 && num <= 0xffffffff) {
--    this.bufferBuilder.append(0xce);
--    this.pack_uint32(num);
--  } else if (num >= -0x80000000 && num <= 0x7fffffff) {
--    this.bufferBuilder.append(0xd2);
--    this.pack_int32(num);
--  } else if (num >= -0x8000000000000000 && num <= 0x7FFFFFFFFFFFFFFF) {
--    this.bufferBuilder.append(0xd3);
--    this.pack_int64(num);
--  } else if (num >= 0x0000000000000000 && num <= 0xFFFFFFFFFFFFFFFF) {
--    this.bufferBuilder.append(0xcf);
--    this.pack_uint64(num);
--  } else {
--    throw new Error('Invalid integer');
--  }
--};
--
--Packer.prototype.pack_double = function (num) {
--  var sign = 0;
--  if (num < 0) {
--    sign = 1;
--    num = -num;
--  }
--  var exp = Math.floor(Math.log(num) / Math.LN2);
--  var frac0 = num / Math.pow(2, exp) - 1;
--  var frac1 = Math.floor(frac0 * Math.pow(2, 52));
--  var b32 = Math.pow(2, 32);
--  var h32 = (sign << 31) | ((exp + 1023) << 20) |
--    (frac1 / b32) & 0x0fffff;
--  var l32 = frac1 % b32;
--  this.bufferBuilder.append(0xcb);
--  this.pack_int32(h32);
--  this.pack_int32(l32);
--};
--
--Packer.prototype.pack_object = function (obj) {
--  var keys = Object.keys(obj);
--  var length = keys.length;
--  if (length <= 0x0f) {
--    this.pack_uint8(0x80 + length);
--  } else if (length <= 0xffff) {
--    this.bufferBuilder.append(0xde);
--    this.pack_uint16(length);
--  } else if (length <= 0xffffffff) {
--    this.bufferBuilder.append(0xdf);
--    this.pack_uint32(length);
--  } else {
--    throw new Error('Invalid length');
--  }
--  for (var prop in obj) {
--    if (obj.hasOwnProperty(prop)) {
--      this.pack(prop);
--      this.pack(obj[prop]);
--    }
--  }
--};
--
--Packer.prototype.pack_uint8 = function (num) {
--  this.bufferBuilder.append(num);
--};
--
--Packer.prototype.pack_uint16 = function (num) {
--  this.bufferBuilder.append(num >> 8);
--  this.bufferBuilder.append(num & 0xff);
--};
--
--Packer.prototype.pack_uint32 = function (num) {
--  var n = num & 0xffffffff;
--  this.bufferBuilder.append((n & 0xff000000) >>> 24);
--  this.bufferBuilder.append((n & 0x00ff0000) >>> 16);
--  this.bufferBuilder.append((n & 0x0000ff00) >>> 8);
--  this.bufferBuilder.append((n & 0x000000ff));
--};
--
--Packer.prototype.pack_uint64 = function (num) {
--  var high = num / Math.pow(2, 32);
--  var low = num % Math.pow(2, 32);
--  this.bufferBuilder.append((high & 0xff000000) >>> 24);
--  this.bufferBuilder.append((high & 0x00ff0000) >>> 16);
--  this.bufferBuilder.append((high & 0x0000ff00) >>> 8);
--  this.bufferBuilder.append((high & 0x000000ff));
--  this.bufferBuilder.append((low & 0xff000000) >>> 24);
--  this.bufferBuilder.append((low & 0x00ff0000) >>> 16);
--  this.bufferBuilder.append((low & 0x0000ff00) >>> 8);
--  this.bufferBuilder.append((low & 0x000000ff));
--};
--
--Packer.prototype.pack_int8 = function (num) {
--  this.bufferBuilder.append(num & 0xff);
--};
--
--Packer.prototype.pack_int16 = function (num) {
--  this.bufferBuilder.append((num & 0xff00) >> 8);
--  this.bufferBuilder.append(num & 0xff);
--};
--
--Packer.prototype.pack_int32 = function (num) {
--  this.bufferBuilder.append((num >>> 24) & 0xff);
--  this.bufferBuilder.append((num & 0x00ff0000) >>> 16);
--  this.bufferBuilder.append((num & 0x0000ff00) >>> 8);
--  this.bufferBuilder.append((num & 0x000000ff));
--};
--
--Packer.prototype.pack_int64 = function (num) {
--  var high = Math.floor(num / Math.pow(2, 32));
--  var low = num % Math.pow(2, 32);
--  this.bufferBuilder.append((high & 0xff000000) >>> 24);
--  this.bufferBuilder.append((high & 0x00ff0000) >>> 16);
--  this.bufferBuilder.append((high & 0x0000ff00) >>> 8);
--  this.bufferBuilder.append((high & 0x000000ff));
--  this.bufferBuilder.append((low & 0xff000000) >>> 24);
--  this.bufferBuilder.append((low & 0x00ff0000) >>> 16);
--  this.bufferBuilder.append((low & 0x0000ff00) >>> 8);
--  this.bufferBuilder.append((low & 0x000000ff));
--};
--
--function _utf8Replace (m) {
--  var code = m.charCodeAt(0);
--
--  if (code <= 0x7ff) return '00';
--  if (code <= 0xffff) return '000';
--  if (code <= 0x1fffff) return '0000';
--  if (code <= 0x3ffffff) return '00000';
--  return '000000';
--}
--
--function utf8Length (str) {
--  if (str.length > 600) {
--    // Blob method faster for large strings
--    return (new Blob([str])).size;
--  } else {
--    return str.replace(/[^\u0000-\u007F]/g, _utf8Replace).length;
--  }
--}
--
--},{"./bufferbuilder":"EgBh"}],"iSxC":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.extractVersion = extractVersion;
--exports.wrapPeerConnectionEvent = wrapPeerConnectionEvent;
--exports.disableLog = disableLog;
--exports.disableWarnings = disableWarnings;
--exports.log = log;
--exports.deprecated = deprecated;
--exports.detectBrowser = detectBrowser;
--exports.compactObject = compactObject;
--exports.walkStats = walkStats;
--exports.filterStats = filterStats;
--
--function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
--
--function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
--
--var logDisabled_ = true;
--var deprecationWarnings_ = true;
--/**
-- * Extract browser version out of the provided user agent string.
-- *
-- * @param {!string} uastring userAgent string.
-- * @param {!string} expr Regular expression used as match criteria.
-- * @param {!number} pos position in the version string to be returned.
-- * @return {!number} browser version.
-- */
--
--function extractVersion(uastring, expr, pos) {
--  var match = uastring.match(expr);
--  return match && match.length >= pos && parseInt(match[pos], 10);
--} // Wraps the peerconnection event eventNameToWrap in a function
--// which returns the modified event object (or false to prevent
--// the event).
--
--
--function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {
--  if (!window.RTCPeerConnection) {
--    return;
--  }
--
--  var proto = window.RTCPeerConnection.prototype;
--  var nativeAddEventListener = proto.addEventListener;
--
--  proto.addEventListener = function (nativeEventName, cb) {
--    if (nativeEventName !== eventNameToWrap) {
--      return nativeAddEventListener.apply(this, arguments);
--    }
--
--    var wrappedCallback = function (e) {
--      var modifiedEvent = wrapper(e);
--
--      if (modifiedEvent) {
--        if (cb.handleEvent) {
--          cb.handleEvent(modifiedEvent);
--        } else {
--          cb(modifiedEvent);
--        }
--      }
--    };
--
--    this._eventMap = this._eventMap || {};
--
--    if (!this._eventMap[eventNameToWrap]) {
--      this._eventMap[eventNameToWrap] = new Map();
--    }
--
--    this._eventMap[eventNameToWrap].set(cb, wrappedCallback);
--
--    return nativeAddEventListener.apply(this, [nativeEventName, wrappedCallback]);
--  };
--
--  var nativeRemoveEventListener = proto.removeEventListener;
--
--  proto.removeEventListener = function (nativeEventName, cb) {
--    if (nativeEventName !== eventNameToWrap || !this._eventMap || !this._eventMap[eventNameToWrap]) {
--      return nativeRemoveEventListener.apply(this, arguments);
--    }
--
--    if (!this._eventMap[eventNameToWrap].has(cb)) {
--      return nativeRemoveEventListener.apply(this, arguments);
--    }
--
--    var unwrappedCb = this._eventMap[eventNameToWrap].get(cb);
--
--    this._eventMap[eventNameToWrap].delete(cb);
--
--    if (this._eventMap[eventNameToWrap].size === 0) {
--      delete this._eventMap[eventNameToWrap];
--    }
--
--    if (Object.keys(this._eventMap).length === 0) {
--      delete this._eventMap;
--    }
--
--    return nativeRemoveEventListener.apply(this, [nativeEventName, unwrappedCb]);
--  };
--
--  Object.defineProperty(proto, 'on' + eventNameToWrap, {
--    get: function () {
--      return this['_on' + eventNameToWrap];
--    },
--    set: function (cb) {
--      if (this['_on' + eventNameToWrap]) {
--        this.removeEventListener(eventNameToWrap, this['_on' + eventNameToWrap]);
--        delete this['_on' + eventNameToWrap];
--      }
--
--      if (cb) {
--        this.addEventListener(eventNameToWrap, this['_on' + eventNameToWrap] = cb);
--      }
--    },
--    enumerable: true,
--    configurable: true
--  });
--}
--
--function disableLog(bool) {
--  if (typeof bool !== 'boolean') {
--    return new Error('Argument type: ' + _typeof(bool) + '. Please use a boolean.');
--  }
--
--  logDisabled_ = bool;
--  return bool ? 'adapter.js logging disabled' : 'adapter.js logging enabled';
--}
--/**
-- * Disable or enable deprecation warnings
-- * @param {!boolean} bool set to true to disable warnings.
-- */
--
--
--function disableWarnings(bool) {
--  if (typeof bool !== 'boolean') {
--    return new Error('Argument type: ' + _typeof(bool) + '. Please use a boolean.');
--  }
--
--  deprecationWarnings_ = !bool;
--  return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');
--}
--
--function log() {
--  if ((typeof window === "undefined" ? "undefined" : _typeof(window)) === 'object') {
--    if (logDisabled_) {
--      return;
--    }
--
--    if (typeof console !== 'undefined' && typeof console.log === 'function') {
--      console.log.apply(console, arguments);
--    }
--  }
--}
--/**
-- * Shows a deprecation warning suggesting the modern and spec-compatible API.
-- */
--
--
--function deprecated(oldMethod, newMethod) {
--  if (!deprecationWarnings_) {
--    return;
--  }
--
--  console.warn(oldMethod + ' is deprecated, please use ' + newMethod + ' instead.');
--}
--/**
-- * Browser detector.
-- *
-- * @return {object} result containing browser and version
-- *     properties.
-- */
--
--
--function detectBrowser(window) {
--  // Returned result object.
--  var result = {
--    browser: null,
--    version: null
--  }; // Fail early if it's not a browser
--
--  if (typeof window === 'undefined' || !window.navigator) {
--    result.browser = 'Not a browser.';
--    return result;
--  }
--
--  var {
--    navigator: navigator
--  } = window;
--
--  if (navigator.mozGetUserMedia) {
--    // Firefox.
--    result.browser = 'firefox';
--    result.version = extractVersion(navigator.userAgent, /Firefox\/(\d+)\./, 1);
--  } else if (navigator.webkitGetUserMedia || window.isSecureContext === false && window.webkitRTCPeerConnection && !window.RTCIceGatherer) {
--    // Chrome, Chromium, Webview, Opera.
--    // Version matches Chrome/WebRTC version.
--    // Chrome 74 removed webkitGetUserMedia on http as well so we need the
--    // more complicated fallback to webkitRTCPeerConnection.
--    result.browser = 'chrome';
--    result.version = extractVersion(navigator.userAgent, /Chrom(e|ium)\/(\d+)\./, 2);
--  } else if (navigator.mediaDevices && navigator.userAgent.match(/Edge\/(\d+).(\d+)$/)) {
--    // Edge.
--    result.browser = 'edge';
--    result.version = extractVersion(navigator.userAgent, /Edge\/(\d+).(\d+)$/, 2);
--  } else if (window.RTCPeerConnection && navigator.userAgent.match(/AppleWebKit\/(\d+)\./)) {
--    // Safari.
--    result.browser = 'safari';
--    result.version = extractVersion(navigator.userAgent, /AppleWebKit\/(\d+)\./, 1);
--    result.supportsUnifiedPlan = window.RTCRtpTransceiver && 'currentDirection' in window.RTCRtpTransceiver.prototype;
--  } else {
--    // Default fallthrough: not supported.
--    result.browser = 'Not a supported browser.';
--    return result;
--  }
--
--  return result;
--}
--/**
-- * Checks if something is an object.
-- *
-- * @param {*} val The something you want to check.
-- * @return true if val is an object, false otherwise.
-- */
--
--
--function isObject(val) {
--  return Object.prototype.toString.call(val) === '[object Object]';
--}
--/**
-- * Remove all empty objects and undefined values
-- * from a nested object -- an enhanced and vanilla version
-- * of Lodash's `compact`.
-- */
--
--
--function compactObject(data) {
--  if (!isObject(data)) {
--    return data;
--  }
--
--  return Object.keys(data).reduce(function (accumulator, key) {
--    var isObj = isObject(data[key]);
--    var value = isObj ? compactObject(data[key]) : data[key];
--    var isEmptyObject = isObj && !Object.keys(value).length;
--
--    if (value === undefined || isEmptyObject) {
--      return accumulator;
--    }
--
--    return Object.assign(accumulator, _defineProperty({}, key, value));
--  }, {});
--}
--/* iterates the stats graph recursively. */
--
--
--function walkStats(stats, base, resultSet) {
--  if (!base || resultSet.has(base.id)) {
--    return;
--  }
--
--  resultSet.set(base.id, base);
--  Object.keys(base).forEach(function (name) {
--    if (name.endsWith('Id')) {
--      walkStats(stats, stats.get(base[name]), resultSet);
--    } else if (name.endsWith('Ids')) {
--      base[name].forEach(function (id) {
--        walkStats(stats, stats.get(id), resultSet);
--      });
--    }
--  });
--}
--/* filter getStats for a sender/receiver track. */
--
--
--function filterStats(result, track, outbound) {
--  var streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';
--  var filteredResult = new Map();
--
--  if (track === null) {
--    return filteredResult;
--  }
--
--  var trackStats = [];
--  result.forEach(function (value) {
--    if (value.type === 'track' && value.trackIdentifier === track.id) {
--      trackStats.push(value);
--    }
--  });
--  trackStats.forEach(function (trackStat) {
--    result.forEach(function (stats) {
--      if (stats.type === streamStatsType && stats.trackId === trackStat.id) {
--        walkStats(result, stats, filteredResult);
--      }
--    });
--  });
--  return filteredResult;
--}
--},{}],"s6SN":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimGetUserMedia = shimGetUserMedia;
--
--var utils = _interopRequireWildcard(require("../utils.js"));
--
--function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
--
--function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
--
--function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
--
--var logging = utils.log;
--
--function shimGetUserMedia(window, browserDetails) {
--  var navigator = window && window.navigator;
--
--  if (!navigator.mediaDevices) {
--    return;
--  }
--
--  var constraintsToChrome_ = function (c) {
--    if (_typeof(c) !== 'object' || c.mandatory || c.optional) {
--      return c;
--    }
--
--    var cc = {};
--    Object.keys(c).forEach(function (key) {
--      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
--        return;
--      }
--
--      var r = _typeof(c[key]) === 'object' ? c[key] : {
--        ideal: c[key]
--      };
--
--      if (r.exact !== undefined && typeof r.exact === 'number') {
--        r.min = r.max = r.exact;
--      }
--
--      var oldname_ = function (prefix, name) {
--        if (prefix) {
--          return prefix + name.charAt(0).toUpperCase() + name.slice(1);
--        }
--
--        return name === 'deviceId' ? 'sourceId' : name;
--      };
--
--      if (r.ideal !== undefined) {
--        cc.optional = cc.optional || [];
--        var oc = {};
--
--        if (typeof r.ideal === 'number') {
--          oc[oldname_('min', key)] = r.ideal;
--          cc.optional.push(oc);
--          oc = {};
--          oc[oldname_('max', key)] = r.ideal;
--          cc.optional.push(oc);
--        } else {
--          oc[oldname_('', key)] = r.ideal;
--          cc.optional.push(oc);
--        }
--      }
--
--      if (r.exact !== undefined && typeof r.exact !== 'number') {
--        cc.mandatory = cc.mandatory || {};
--        cc.mandatory[oldname_('', key)] = r.exact;
--      } else {
--        ['min', 'max'].forEach(function (mix) {
--          if (r[mix] !== undefined) {
--            cc.mandatory = cc.mandatory || {};
--            cc.mandatory[oldname_(mix, key)] = r[mix];
--          }
--        });
--      }
--    });
--
--    if (c.advanced) {
--      cc.optional = (cc.optional || []).concat(c.advanced);
--    }
--
--    return cc;
--  };
--
--  var shimConstraints_ = function (constraints, func) {
--    if (browserDetails.version >= 61) {
--      return func(constraints);
--    }
--
--    constraints = JSON.parse(JSON.stringify(constraints));
--
--    if (constraints && _typeof(constraints.audio) === 'object') {
--      var remap = function (obj, a, b) {
--        if (a in obj && !(b in obj)) {
--          obj[b] = obj[a];
--          delete obj[a];
--        }
--      };
--
--      constraints = JSON.parse(JSON.stringify(constraints));
--      remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');
--      remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');
--      constraints.audio = constraintsToChrome_(constraints.audio);
--    }
--
--    if (constraints && _typeof(constraints.video) === 'object') {
--      // Shim facingMode for mobile & surface pro.
--      var face = constraints.video.facingMode;
--      face = face && (_typeof(face) === 'object' ? face : {
--        ideal: face
--      });
--      var getSupportedFacingModeLies = browserDetails.version < 66;
--
--      if (face && (face.exact === 'user' || face.exact === 'environment' || face.ideal === 'user' || face.ideal === 'environment') && !(navigator.mediaDevices.getSupportedConstraints && navigator.mediaDevices.getSupportedConstraints().facingMode && !getSupportedFacingModeLies)) {
--        delete constraints.video.facingMode;
--        var matches;
--
--        if (face.exact === 'environment' || face.ideal === 'environment') {
--          matches = ['back', 'rear'];
--        } else if (face.exact === 'user' || face.ideal === 'user') {
--          matches = ['front'];
--        }
--
--        if (matches) {
--          // Look for matches in label, or use last cam for back (typical).
--          return navigator.mediaDevices.enumerateDevices().then(function (devices) {
--            devices = devices.filter(function (d) {
--              return d.kind === 'videoinput';
--            });
--            var dev = devices.find(function (d) {
--              return matches.some(function (match) {
--                return d.label.toLowerCase().includes(match);
--              });
--            });
--
--            if (!dev && devices.length && matches.includes('back')) {
--              dev = devices[devices.length - 1]; // more likely the back cam
--            }
--
--            if (dev) {
--              constraints.video.deviceId = face.exact ? {
--                exact: dev.deviceId
--              } : {
--                ideal: dev.deviceId
--              };
--            }
--
--            constraints.video = constraintsToChrome_(constraints.video);
--            logging('chrome: ' + JSON.stringify(constraints));
--            return func(constraints);
--          });
--        }
--      }
--
--      constraints.video = constraintsToChrome_(constraints.video);
--    }
--
--    logging('chrome: ' + JSON.stringify(constraints));
--    return func(constraints);
--  };
--
--  var shimError_ = function (e) {
--    if (browserDetails.version >= 64) {
--      return e;
--    }
--
--    return {
--      name: {
--        PermissionDeniedError: 'NotAllowedError',
--        PermissionDismissedError: 'NotAllowedError',
--        InvalidStateError: 'NotAllowedError',
--        DevicesNotFoundError: 'NotFoundError',
--        ConstraintNotSatisfiedError: 'OverconstrainedError',
--        TrackStartError: 'NotReadableError',
--        MediaDeviceFailedDueToShutdown: 'NotAllowedError',
--        MediaDeviceKillSwitchOn: 'NotAllowedError',
--        TabCaptureError: 'AbortError',
--        ScreenCaptureError: 'AbortError',
--        DeviceCaptureError: 'AbortError'
--      }[e.name] || e.name,
--      message: e.message,
--      constraint: e.constraint || e.constraintName,
--      toString: function () {
--        return this.name + (this.message && ': ') + this.message;
--      }
--    };
--  };
--
--  var getUserMedia_ = function (constraints, onSuccess, onError) {
--    shimConstraints_(constraints, function (c) {
--      navigator.webkitGetUserMedia(c, onSuccess, function (e) {
--        if (onError) {
--          onError(shimError_(e));
--        }
--      });
--    });
--  };
--
--  navigator.getUserMedia = getUserMedia_.bind(navigator); // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia
--  // function which returns a Promise, it does not accept spec-style
--  // constraints.
--
--  if (navigator.mediaDevices.getUserMedia) {
--    var origGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
--
--    navigator.mediaDevices.getUserMedia = function (cs) {
--      return shimConstraints_(cs, function (c) {
--        return origGetUserMedia(c).then(function (stream) {
--          if (c.audio && !stream.getAudioTracks().length || c.video && !stream.getVideoTracks().length) {
--            stream.getTracks().forEach(function (track) {
--              track.stop();
--            });
--            throw new DOMException('', 'NotFoundError');
--          }
--
--          return stream;
--        }, function (e) {
--          return Promise.reject(shimError_(e));
--        });
--      });
--    };
--  }
--}
--},{"../utils.js":"iSxC"}],"VHa8":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimGetDisplayMedia = shimGetDisplayMedia;
--
--function shimGetDisplayMedia(window, getSourceId) {
--  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
--    return;
--  }
--
--  if (!window.navigator.mediaDevices) {
--    return;
--  } // getSourceId is a function that returns a promise resolving with
--  // the sourceId of the screen/window/tab to be shared.
--
--
--  if (typeof getSourceId !== 'function') {
--    console.error('shimGetDisplayMedia: getSourceId argument is not ' + 'a function');
--    return;
--  }
--
--  window.navigator.mediaDevices.getDisplayMedia = function getDisplayMedia(constraints) {
--    return getSourceId(constraints).then(function (sourceId) {
--      var widthSpecified = constraints.video && constraints.video.width;
--      var heightSpecified = constraints.video && constraints.video.height;
--      var frameRateSpecified = constraints.video && constraints.video.frameRate;
--      constraints.video = {
--        mandatory: {
--          chromeMediaSource: 'desktop',
--          chromeMediaSourceId: sourceId,
--          maxFrameRate: frameRateSpecified || 3
--        }
--      };
--
--      if (widthSpecified) {
--        constraints.video.mandatory.maxWidth = widthSpecified;
--      }
--
--      if (heightSpecified) {
--        constraints.video.mandatory.maxHeight = heightSpecified;
--      }
--
--      return window.navigator.mediaDevices.getUserMedia(constraints);
--    });
--  };
--}
--},{}],"uI5X":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimMediaStream = shimMediaStream;
--exports.shimOnTrack = shimOnTrack;
--exports.shimGetSendersWithDtmf = shimGetSendersWithDtmf;
--exports.shimGetStats = shimGetStats;
--exports.shimSenderReceiverGetStats = shimSenderReceiverGetStats;
--exports.shimAddTrackRemoveTrackWithNative = shimAddTrackRemoveTrackWithNative;
--exports.shimAddTrackRemoveTrack = shimAddTrackRemoveTrack;
--exports.shimPeerConnection = shimPeerConnection;
--exports.fixNegotiationNeeded = fixNegotiationNeeded;
--Object.defineProperty(exports, "shimGetUserMedia", {
--  enumerable: true,
--  get: function () {
--    return _getusermedia.shimGetUserMedia;
--  }
--});
--Object.defineProperty(exports, "shimGetDisplayMedia", {
--  enumerable: true,
--  get: function () {
--    return _getdisplaymedia.shimGetDisplayMedia;
--  }
--});
--
--var utils = _interopRequireWildcard(require("../utils.js"));
--
--var _getusermedia = require("./getusermedia");
--
--var _getdisplaymedia = require("./getdisplaymedia");
--
--function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
--
--function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
--
--function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
--
--function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
--
--function shimMediaStream(window) {
--  window.MediaStream = window.MediaStream || window.webkitMediaStream;
--}
--
--function shimOnTrack(window) {
--  if (_typeof(window) === 'object' && window.RTCPeerConnection && !('ontrack' in window.RTCPeerConnection.prototype)) {
--    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
--      get: function () {
--        return this._ontrack;
--      },
--      set: function (f) {
--        if (this._ontrack) {
--          this.removeEventListener('track', this._ontrack);
--        }
--
--        this.addEventListener('track', this._ontrack = f);
--      },
--      enumerable: true,
--      configurable: true
--    });
--    var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
--
--    window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
--      var _this = this;
--
--      if (!this._ontrackpoly) {
--        this._ontrackpoly = function (e) {
--          // onaddstream does not fire when a track is added to an existing
--          // stream. But stream.onaddtrack is implemented so we use that.
--          e.stream.addEventListener('addtrack', function (te) {
--            var receiver;
--
--            if (window.RTCPeerConnection.prototype.getReceivers) {
--              receiver = _this.getReceivers().find(function (r) {
--                return r.track && r.track.id === te.track.id;
--              });
--            } else {
--              receiver = {
--                track: te.track
--              };
--            }
--
--            var event = new Event('track');
--            event.track = te.track;
--            event.receiver = receiver;
--            event.transceiver = {
--              receiver: receiver
--            };
--            event.streams = [e.stream];
--
--            _this.dispatchEvent(event);
--          });
--          e.stream.getTracks().forEach(function (track) {
--            var receiver;
--
--            if (window.RTCPeerConnection.prototype.getReceivers) {
--              receiver = _this.getReceivers().find(function (r) {
--                return r.track && r.track.id === track.id;
--              });
--            } else {
--              receiver = {
--                track: track
--              };
--            }
--
--            var event = new Event('track');
--            event.track = track;
--            event.receiver = receiver;
--            event.transceiver = {
--              receiver: receiver
--            };
--            event.streams = [e.stream];
--
--            _this.dispatchEvent(event);
--          });
--        };
--
--        this.addEventListener('addstream', this._ontrackpoly);
--      }
--
--      return origSetRemoteDescription.apply(this, arguments);
--    };
--  } else {
--    // even if RTCRtpTransceiver is in window, it is only used and
--    // emitted in unified-plan. Unfortunately this means we need
--    // to unconditionally wrap the event.
--    utils.wrapPeerConnectionEvent(window, 'track', function (e) {
--      if (!e.transceiver) {
--        Object.defineProperty(e, 'transceiver', {
--          value: {
--            receiver: e.receiver
--          }
--        });
--      }
--
--      return e;
--    });
--  }
--}
--
--function shimGetSendersWithDtmf(window) {
--  // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.
--  if (_typeof(window) === 'object' && window.RTCPeerConnection && !('getSenders' in window.RTCPeerConnection.prototype) && 'createDTMFSender' in window.RTCPeerConnection.prototype) {
--    var shimSenderWithDtmf = function (pc, track) {
--      return {
--        track: track,
--
--        get dtmf() {
--          if (this._dtmf === undefined) {
--            if (track.kind === 'audio') {
--              this._dtmf = pc.createDTMFSender(track);
--            } else {
--              this._dtmf = null;
--            }
--          }
--
--          return this._dtmf;
--        },
--
--        _pc: pc
--      };
--    }; // augment addTrack when getSenders is not available.
--
--
--    if (!window.RTCPeerConnection.prototype.getSenders) {
--      window.RTCPeerConnection.prototype.getSenders = function getSenders() {
--        this._senders = this._senders || [];
--        return this._senders.slice(); // return a copy of the internal state.
--      };
--
--      var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
--
--      window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
--        var sender = origAddTrack.apply(this, arguments);
--
--        if (!sender) {
--          sender = shimSenderWithDtmf(this, track);
--
--          this._senders.push(sender);
--        }
--
--        return sender;
--      };
--
--      var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;
--
--      window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
--        origRemoveTrack.apply(this, arguments);
--
--        var idx = this._senders.indexOf(sender);
--
--        if (idx !== -1) {
--          this._senders.splice(idx, 1);
--        }
--      };
--    }
--
--    var origAddStream = window.RTCPeerConnection.prototype.addStream;
--
--    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
--      var _this2 = this;
--
--      this._senders = this._senders || [];
--      origAddStream.apply(this, [stream]);
--      stream.getTracks().forEach(function (track) {
--        _this2._senders.push(shimSenderWithDtmf(_this2, track));
--      });
--    };
--
--    var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
--
--    window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
--      var _this3 = this;
--
--      this._senders = this._senders || [];
--      origRemoveStream.apply(this, [stream]);
--      stream.getTracks().forEach(function (track) {
--        var sender = _this3._senders.find(function (s) {
--          return s.track === track;
--        });
--
--        if (sender) {
--          // remove sender
--          _this3._senders.splice(_this3._senders.indexOf(sender), 1);
--        }
--      });
--    };
--  } else if (_typeof(window) === 'object' && window.RTCPeerConnection && 'getSenders' in window.RTCPeerConnection.prototype && 'createDTMFSender' in window.RTCPeerConnection.prototype && window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {
--    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
--
--    window.RTCPeerConnection.prototype.getSenders = function getSenders() {
--      var _this4 = this;
--
--      var senders = origGetSenders.apply(this, []);
--      senders.forEach(function (sender) {
--        return sender._pc = _this4;
--      });
--      return senders;
--    };
--
--    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {
--      get: function () {
--        if (this._dtmf === undefined) {
--          if (this.track.kind === 'audio') {
--            this._dtmf = this._pc.createDTMFSender(this.track);
--          } else {
--            this._dtmf = null;
--          }
--        }
--
--        return this._dtmf;
--      }
--    });
--  }
--}
--
--function shimGetStats(window) {
--  if (!window.RTCPeerConnection) {
--    return;
--  }
--
--  var origGetStats = window.RTCPeerConnection.prototype.getStats;
--
--  window.RTCPeerConnection.prototype.getStats = function getStats() {
--    var _this5 = this;
--
--    var [selector, onSucc, onErr] = arguments; // If selector is a function then we are in the old style stats so just
--    // pass back the original getStats format to avoid breaking old users.
--
--    if (arguments.length > 0 && typeof selector === 'function') {
--      return origGetStats.apply(this, arguments);
--    } // When spec-style getStats is supported, return those when called with
--    // either no arguments or the selector argument is null.
--
--
--    if (origGetStats.length === 0 && (arguments.length === 0 || typeof selector !== 'function')) {
--      return origGetStats.apply(this, []);
--    }
--
--    var fixChromeStats_ = function (response) {
--      var standardReport = {};
--      var reports = response.result();
--      reports.forEach(function (report) {
--        var standardStats = {
--          id: report.id,
--          timestamp: report.timestamp,
--          type: {
--            localcandidate: 'local-candidate',
--            remotecandidate: 'remote-candidate'
--          }[report.type] || report.type
--        };
--        report.names().forEach(function (name) {
--          standardStats[name] = report.stat(name);
--        });
--        standardReport[standardStats.id] = standardStats;
--      });
--      return standardReport;
--    }; // shim getStats with maplike support
--
--
--    var makeMapStats = function (stats) {
--      return new Map(Object.keys(stats).map(function (key) {
--        return [key, stats[key]];
--      }));
--    };
--
--    if (arguments.length >= 2) {
--      var successCallbackWrapper_ = function (response) {
--        onSucc(makeMapStats(fixChromeStats_(response)));
--      };
--
--      return origGetStats.apply(this, [successCallbackWrapper_, selector]);
--    } // promise-support
--
--
--    return new Promise(function (resolve, reject) {
--      origGetStats.apply(_this5, [function (response) {
--        resolve(makeMapStats(fixChromeStats_(response)));
--      }, reject]);
--    }).then(onSucc, onErr);
--  };
--}
--
--function shimSenderReceiverGetStats(window) {
--  if (!(_typeof(window) === 'object' && window.RTCPeerConnection && window.RTCRtpSender && window.RTCRtpReceiver)) {
--    return;
--  } // shim sender stats.
--
--
--  if (!('getStats' in window.RTCRtpSender.prototype)) {
--    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
--
--    if (origGetSenders) {
--      window.RTCPeerConnection.prototype.getSenders = function getSenders() {
--        var _this6 = this;
--
--        var senders = origGetSenders.apply(this, []);
--        senders.forEach(function (sender) {
--          return sender._pc = _this6;
--        });
--        return senders;
--      };
--    }
--
--    var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
--
--    if (origAddTrack) {
--      window.RTCPeerConnection.prototype.addTrack = function addTrack() {
--        var sender = origAddTrack.apply(this, arguments);
--        sender._pc = this;
--        return sender;
--      };
--    }
--
--    window.RTCRtpSender.prototype.getStats = function getStats() {
--      var sender = this;
--      return this._pc.getStats().then(function (result) {
--        return (
--          /* Note: this will include stats of all senders that
--           *   send a track with the same id as sender.track as
--           *   it is not possible to identify the RTCRtpSender.
--           */
--          utils.filterStats(result, sender.track, true)
--        );
--      });
--    };
--  } // shim receiver stats.
--
--
--  if (!('getStats' in window.RTCRtpReceiver.prototype)) {
--    var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;
--
--    if (origGetReceivers) {
--      window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {
--        var _this7 = this;
--
--        var receivers = origGetReceivers.apply(this, []);
--        receivers.forEach(function (receiver) {
--          return receiver._pc = _this7;
--        });
--        return receivers;
--      };
--    }
--
--    utils.wrapPeerConnectionEvent(window, 'track', function (e) {
--      e.receiver._pc = e.srcElement;
--      return e;
--    });
--
--    window.RTCRtpReceiver.prototype.getStats = function getStats() {
--      var receiver = this;
--      return this._pc.getStats().then(function (result) {
--        return utils.filterStats(result, receiver.track, false);
--      });
--    };
--  }
--
--  if (!('getStats' in window.RTCRtpSender.prototype && 'getStats' in window.RTCRtpReceiver.prototype)) {
--    return;
--  } // shim RTCPeerConnection.getStats(track).
--
--
--  var origGetStats = window.RTCPeerConnection.prototype.getStats;
--
--  window.RTCPeerConnection.prototype.getStats = function getStats() {
--    if (arguments.length > 0 && arguments[0] instanceof window.MediaStreamTrack) {
--      var track = arguments[0];
--      var sender;
--      var receiver;
--      var err;
--      this.getSenders().forEach(function (s) {
--        if (s.track === track) {
--          if (sender) {
--            err = true;
--          } else {
--            sender = s;
--          }
--        }
--      });
--      this.getReceivers().forEach(function (r) {
--        if (r.track === track) {
--          if (receiver) {
--            err = true;
--          } else {
--            receiver = r;
--          }
--        }
--
--        return r.track === track;
--      });
--
--      if (err || sender && receiver) {
--        return Promise.reject(new DOMException('There are more than one sender or receiver for the track.', 'InvalidAccessError'));
--      } else if (sender) {
--        return sender.getStats();
--      } else if (receiver) {
--        return receiver.getStats();
--      }
--
--      return Promise.reject(new DOMException('There is no sender or receiver for the track.', 'InvalidAccessError'));
--    }
--
--    return origGetStats.apply(this, arguments);
--  };
--}
--
--function shimAddTrackRemoveTrackWithNative(window) {
--  // shim addTrack/removeTrack with native variants in order to make
--  // the interactions with legacy getLocalStreams behave as in other browsers.
--  // Keeps a mapping stream.id => [stream, rtpsenders...]
--  window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
--    var _this8 = this;
--
--    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
--    return Object.keys(this._shimmedLocalStreams).map(function (streamId) {
--      return _this8._shimmedLocalStreams[streamId][0];
--    });
--  };
--
--  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
--
--  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
--    if (!stream) {
--      return origAddTrack.apply(this, arguments);
--    }
--
--    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
--    var sender = origAddTrack.apply(this, arguments);
--
--    if (!this._shimmedLocalStreams[stream.id]) {
--      this._shimmedLocalStreams[stream.id] = [stream, sender];
--    } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {
--      this._shimmedLocalStreams[stream.id].push(sender);
--    }
--
--    return sender;
--  };
--
--  var origAddStream = window.RTCPeerConnection.prototype.addStream;
--
--  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
--    var _this9 = this;
--
--    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
--    stream.getTracks().forEach(function (track) {
--      var alreadyExists = _this9.getSenders().find(function (s) {
--        return s.track === track;
--      });
--
--      if (alreadyExists) {
--        throw new DOMException('Track already exists.', 'InvalidAccessError');
--      }
--    });
--    var existingSenders = this.getSenders();
--    origAddStream.apply(this, arguments);
--    var newSenders = this.getSenders().filter(function (newSender) {
--      return existingSenders.indexOf(newSender) === -1;
--    });
--    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);
--  };
--
--  var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
--
--  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
--    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
--    delete this._shimmedLocalStreams[stream.id];
--    return origRemoveStream.apply(this, arguments);
--  };
--
--  var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;
--
--  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
--    var _this10 = this;
--
--    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
--
--    if (sender) {
--      Object.keys(this._shimmedLocalStreams).forEach(function (streamId) {
--        var idx = _this10._shimmedLocalStreams[streamId].indexOf(sender);
--
--        if (idx !== -1) {
--          _this10._shimmedLocalStreams[streamId].splice(idx, 1);
--        }
--
--        if (_this10._shimmedLocalStreams[streamId].length === 1) {
--          delete _this10._shimmedLocalStreams[streamId];
--        }
--      });
--    }
--
--    return origRemoveTrack.apply(this, arguments);
--  };
--}
--
--function shimAddTrackRemoveTrack(window, browserDetails) {
--  if (!window.RTCPeerConnection) {
--    return;
--  } // shim addTrack and removeTrack.
--
--
--  if (window.RTCPeerConnection.prototype.addTrack && browserDetails.version >= 65) {
--    return shimAddTrackRemoveTrackWithNative(window);
--  } // also shim pc.getLocalStreams when addTrack is shimmed
--  // to return the original streams.
--
--
--  var origGetLocalStreams = window.RTCPeerConnection.prototype.getLocalStreams;
--
--  window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
--    var _this11 = this;
--
--    var nativeStreams = origGetLocalStreams.apply(this);
--    this._reverseStreams = this._reverseStreams || {};
--    return nativeStreams.map(function (stream) {
--      return _this11._reverseStreams[stream.id];
--    });
--  };
--
--  var origAddStream = window.RTCPeerConnection.prototype.addStream;
--
--  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
--    var _this12 = this;
--
--    this._streams = this._streams || {};
--    this._reverseStreams = this._reverseStreams || {};
--    stream.getTracks().forEach(function (track) {
--      var alreadyExists = _this12.getSenders().find(function (s) {
--        return s.track === track;
--      });
--
--      if (alreadyExists) {
--        throw new DOMException('Track already exists.', 'InvalidAccessError');
--      }
--    }); // Add identity mapping for consistency with addTrack.
--    // Unless this is being used with a stream from addTrack.
--
--    if (!this._reverseStreams[stream.id]) {
--      var newStream = new window.MediaStream(stream.getTracks());
--      this._streams[stream.id] = newStream;
--      this._reverseStreams[newStream.id] = stream;
--      stream = newStream;
--    }
--
--    origAddStream.apply(this, [stream]);
--  };
--
--  var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
--
--  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
--    this._streams = this._streams || {};
--    this._reverseStreams = this._reverseStreams || {};
--    origRemoveStream.apply(this, [this._streams[stream.id] || stream]);
--    delete this._reverseStreams[this._streams[stream.id] ? this._streams[stream.id].id : stream.id];
--    delete this._streams[stream.id];
--  };
--
--  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
--    var _this13 = this;
--
--    if (this.signalingState === 'closed') {
--      throw new DOMException('The RTCPeerConnection\'s signalingState is \'closed\'.', 'InvalidStateError');
--    }
--
--    var streams = [].slice.call(arguments, 1);
--
--    if (streams.length !== 1 || !streams[0].getTracks().find(function (t) {
--      return t === track;
--    })) {
--      // this is not fully correct but all we can manage without
--      // [[associated MediaStreams]] internal slot.
--      throw new DOMException('The adapter.js addTrack polyfill only supports a single ' + ' stream which is associated with the specified track.', 'NotSupportedError');
--    }
--
--    var alreadyExists = this.getSenders().find(function (s) {
--      return s.track === track;
--    });
--
--    if (alreadyExists) {
--      throw new DOMException('Track already exists.', 'InvalidAccessError');
--    }
--
--    this._streams = this._streams || {};
--    this._reverseStreams = this._reverseStreams || {};
--    var oldStream = this._streams[stream.id];
--
--    if (oldStream) {
--      // this is using odd Chrome behaviour, use with caution:
--      // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815
--      // Note: we rely on the high-level addTrack/dtmf shim to
--      // create the sender with a dtmf sender.
--      oldStream.addTrack(track); // Trigger ONN async.
--
--      Promise.resolve().then(function () {
--        _this13.dispatchEvent(new Event('negotiationneeded'));
--      });
--    } else {
--      var newStream = new window.MediaStream([track]);
--      this._streams[stream.id] = newStream;
--      this._reverseStreams[newStream.id] = stream;
--      this.addStream(newStream);
--    }
--
--    return this.getSenders().find(function (s) {
--      return s.track === track;
--    });
--  }; // replace the internal stream id with the external one and
--  // vice versa.
--
--
--  function replaceInternalStreamId(pc, description) {
--    var sdp = description.sdp;
--    Object.keys(pc._reverseStreams || []).forEach(function (internalId) {
--      var externalStream = pc._reverseStreams[internalId];
--      var internalStream = pc._streams[externalStream.id];
--      sdp = sdp.replace(new RegExp(internalStream.id, 'g'), externalStream.id);
--    });
--    return new RTCSessionDescription({
--      type: description.type,
--      sdp: sdp
--    });
--  }
--
--  function replaceExternalStreamId(pc, description) {
--    var sdp = description.sdp;
--    Object.keys(pc._reverseStreams || []).forEach(function (internalId) {
--      var externalStream = pc._reverseStreams[internalId];
--      var internalStream = pc._streams[externalStream.id];
--      sdp = sdp.replace(new RegExp(externalStream.id, 'g'), internalStream.id);
--    });
--    return new RTCSessionDescription({
--      type: description.type,
--      sdp: sdp
--    });
--  }
--
--  ['createOffer', 'createAnswer'].forEach(function (method) {
--    var nativeMethod = window.RTCPeerConnection.prototype[method];
--
--    var methodObj = _defineProperty({}, method, function () {
--      var _this14 = this;
--
--      var args = arguments;
--      var isLegacyCall = arguments.length && typeof arguments[0] === 'function';
--
--      if (isLegacyCall) {
--        return nativeMethod.apply(this, [function (description) {
--          var desc = replaceInternalStreamId(_this14, description);
--          args[0].apply(null, [desc]);
--        }, function (err) {
--          if (args[1]) {
--            args[1].apply(null, err);
--          }
--        }, arguments[2]]);
--      }
--
--      return nativeMethod.apply(this, arguments).then(function (description) {
--        return replaceInternalStreamId(_this14, description);
--      });
--    });
--
--    window.RTCPeerConnection.prototype[method] = methodObj[method];
--  });
--  var origSetLocalDescription = window.RTCPeerConnection.prototype.setLocalDescription;
--
--  window.RTCPeerConnection.prototype.setLocalDescription = function setLocalDescription() {
--    if (!arguments.length || !arguments[0].type) {
--      return origSetLocalDescription.apply(this, arguments);
--    }
--
--    arguments[0] = replaceExternalStreamId(this, arguments[0]);
--    return origSetLocalDescription.apply(this, arguments);
--  }; // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier
--
--
--  var origLocalDescription = Object.getOwnPropertyDescriptor(window.RTCPeerConnection.prototype, 'localDescription');
--  Object.defineProperty(window.RTCPeerConnection.prototype, 'localDescription', {
--    get: function () {
--      var description = origLocalDescription.get.apply(this);
--
--      if (description.type === '') {
--        return description;
--      }
--
--      return replaceInternalStreamId(this, description);
--    }
--  });
--
--  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
--    var _this15 = this;
--
--    if (this.signalingState === 'closed') {
--      throw new DOMException('The RTCPeerConnection\'s signalingState is \'closed\'.', 'InvalidStateError');
--    } // We can not yet check for sender instanceof RTCRtpSender
--    // since we shim RTPSender. So we check if sender._pc is set.
--
--
--    if (!sender._pc) {
--      throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' + 'does not implement interface RTCRtpSender.', 'TypeError');
--    }
--
--    var isLocal = sender._pc === this;
--
--    if (!isLocal) {
--      throw new DOMException('Sender was not created by this connection.', 'InvalidAccessError');
--    } // Search for the native stream the senders track belongs to.
--
--
--    this._streams = this._streams || {};
--    var stream;
--    Object.keys(this._streams).forEach(function (streamid) {
--      var hasTrack = _this15._streams[streamid].getTracks().find(function (track) {
--        return sender.track === track;
--      });
--
--      if (hasTrack) {
--        stream = _this15._streams[streamid];
--      }
--    });
--
--    if (stream) {
--      if (stream.getTracks().length === 1) {
--        // if this is the last track of the stream, remove the stream. This
--        // takes care of any shimmed _senders.
--        this.removeStream(this._reverseStreams[stream.id]);
--      } else {
--        // relying on the same odd chrome behaviour as above.
--        stream.removeTrack(sender.track);
--      }
--
--      this.dispatchEvent(new Event('negotiationneeded'));
--    }
--  };
--}
--
--function shimPeerConnection(window, browserDetails) {
--  if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {
--    // very basic support for old versions.
--    window.RTCPeerConnection = window.webkitRTCPeerConnection;
--  }
--
--  if (!window.RTCPeerConnection) {
--    return;
--  } // shim implicit creation of RTCSessionDescription/RTCIceCandidate
--
--
--  if (browserDetails.version < 53) {
--    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {
--      var nativeMethod = window.RTCPeerConnection.prototype[method];
--
--      var methodObj = _defineProperty({}, method, function () {
--        arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);
--        return nativeMethod.apply(this, arguments);
--      });
--
--      window.RTCPeerConnection.prototype[method] = methodObj[method];
--    });
--  }
--} // Attempt to fix ONN in plan-b mode.
--
--
--function fixNegotiationNeeded(window, browserDetails) {
--  utils.wrapPeerConnectionEvent(window, 'negotiationneeded', function (e) {
--    var pc = e.target;
--
--    if (browserDetails.version < 72 || pc.getConfiguration && pc.getConfiguration().sdpSemantics === 'plan-b') {
--      if (pc.signalingState !== 'stable') {
--        return;
--      }
--    }
--
--    return e;
--  });
--}
--},{"../utils.js":"iSxC","./getusermedia":"s6SN","./getdisplaymedia":"VHa8"}],"NZ1C":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.filterIceServers = filterIceServers;
--
--var utils = _interopRequireWildcard(require("../utils"));
--
--function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
--
--function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
--
--// Edge does not like
--// 1) stun: filtered after 14393 unless ?transport=udp is present
--// 2) turn: that does not have all of turn:host:port?transport=udp
--// 3) turn: with ipv6 addresses
--// 4) turn: occurring muliple times
--function filterIceServers(iceServers, edgeVersion) {
--  var hasTurn = false;
--  iceServers = JSON.parse(JSON.stringify(iceServers));
--  return iceServers.filter(function (server) {
--    if (server && (server.urls || server.url)) {
--      var urls = server.urls || server.url;
--
--      if (server.url && !server.urls) {
--        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');
--      }
--
--      var isString = typeof urls === 'string';
--
--      if (isString) {
--        urls = [urls];
--      }
--
--      urls = urls.filter(function (url) {
--        // filter STUN unconditionally.
--        if (url.indexOf('stun:') === 0) {
--          return false;
--        }
--
--        var validTurn = url.startsWith('turn') && !url.startsWith('turn:[') && url.includes('transport=udp');
--
--        if (validTurn && !hasTurn) {
--          hasTurn = true;
--          return true;
--        }
--
--        return validTurn && !hasTurn;
--      });
--      delete server.url;
--      server.urls = isString ? urls[0] : urls;
--      return !!urls.length;
--    }
--  });
--}
--},{"../utils":"iSxC"}],"YHvh":[function(require,module,exports) {
--/* eslint-env node */
--'use strict';
--
--// SDP helpers.
--var SDPUtils = {};
--
--// Generate an alphanumeric identifier for cname or mids.
--// TODO: use UUIDs instead? https://gist.github.com/jed/982883
--SDPUtils.generateIdentifier = function() {
--  return Math.random().toString(36).substr(2, 10);
--};
--
--// The RTCP CNAME used by all peerconnections from the same JS.
--SDPUtils.localCName = SDPUtils.generateIdentifier();
--
--// Splits SDP into lines, dealing with both CRLF and LF.
--SDPUtils.splitLines = function(blob) {
--  return blob.trim().split('\n').map(function(line) {
--    return line.trim();
--  });
--};
--// Splits SDP into sessionpart and mediasections. Ensures CRLF.
--SDPUtils.splitSections = function(blob) {
--  var parts = blob.split('\nm=');
--  return parts.map(function(part, index) {
--    return (index > 0 ? 'm=' + part : part).trim() + '\r\n';
--  });
--};
--
--// returns the session description.
--SDPUtils.getDescription = function(blob) {
--  var sections = SDPUtils.splitSections(blob);
--  return sections && sections[0];
--};
--
--// returns the individual media sections.
--SDPUtils.getMediaSections = function(blob) {
--  var sections = SDPUtils.splitSections(blob);
--  sections.shift();
--  return sections;
--};
--
--// Returns lines that start with a certain prefix.
--SDPUtils.matchPrefix = function(blob, prefix) {
--  return SDPUtils.splitLines(blob).filter(function(line) {
--    return line.indexOf(prefix) === 0;
--  });
--};
--
--// Parses an ICE candidate line. Sample input:
--// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8
--// rport 55996"
--SDPUtils.parseCandidate = function(line) {
--  var parts;
--  // Parse both variants.
--  if (line.indexOf('a=candidate:') === 0) {
--    parts = line.substring(12).split(' ');
--  } else {
--    parts = line.substring(10).split(' ');
--  }
--
--  var candidate = {
--    foundation: parts[0],
--    component: parseInt(parts[1], 10),
--    protocol: parts[2].toLowerCase(),
--    priority: parseInt(parts[3], 10),
--    ip: parts[4],
--    address: parts[4], // address is an alias for ip.
--    port: parseInt(parts[5], 10),
--    // skip parts[6] == 'typ'
--    type: parts[7]
--  };
--
--  for (var i = 8; i < parts.length; i += 2) {
--    switch (parts[i]) {
--      case 'raddr':
--        candidate.relatedAddress = parts[i + 1];
--        break;
--      case 'rport':
--        candidate.relatedPort = parseInt(parts[i + 1], 10);
--        break;
--      case 'tcptype':
--        candidate.tcpType = parts[i + 1];
--        break;
--      case 'ufrag':
--        candidate.ufrag = parts[i + 1]; // for backward compability.
--        candidate.usernameFragment = parts[i + 1];
--        break;
--      default: // extension handling, in particular ufrag
--        candidate[parts[i]] = parts[i + 1];
--        break;
--    }
--  }
--  return candidate;
--};
--
--// Translates a candidate object into SDP candidate attribute.
--SDPUtils.writeCandidate = function(candidate) {
--  var sdp = [];
--  sdp.push(candidate.foundation);
--  sdp.push(candidate.component);
--  sdp.push(candidate.protocol.toUpperCase());
--  sdp.push(candidate.priority);
--  sdp.push(candidate.address || candidate.ip);
--  sdp.push(candidate.port);
--
--  var type = candidate.type;
--  sdp.push('typ');
--  sdp.push(type);
--  if (type !== 'host' && candidate.relatedAddress &&
--      candidate.relatedPort) {
--    sdp.push('raddr');
--    sdp.push(candidate.relatedAddress);
--    sdp.push('rport');
--    sdp.push(candidate.relatedPort);
--  }
--  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {
--    sdp.push('tcptype');
--    sdp.push(candidate.tcpType);
--  }
--  if (candidate.usernameFragment || candidate.ufrag) {
--    sdp.push('ufrag');
--    sdp.push(candidate.usernameFragment || candidate.ufrag);
--  }
--  return 'candidate:' + sdp.join(' ');
--};
--
--// Parses an ice-options line, returns an array of option tags.
--// a=ice-options:foo bar
--SDPUtils.parseIceOptions = function(line) {
--  return line.substr(14).split(' ');
--};
--
--// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:
--// a=rtpmap:111 opus/48000/2
--SDPUtils.parseRtpMap = function(line) {
--  var parts = line.substr(9).split(' ');
--  var parsed = {
--    payloadType: parseInt(parts.shift(), 10) // was: id
--  };
--
--  parts = parts[0].split('/');
--
--  parsed.name = parts[0];
--  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate
--  parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;
--  // legacy alias, got renamed back to channels in ORTC.
--  parsed.numChannels = parsed.channels;
--  return parsed;
--};
--
--// Generate an a=rtpmap line from RTCRtpCodecCapability or
--// RTCRtpCodecParameters.
--SDPUtils.writeRtpMap = function(codec) {
--  var pt = codec.payloadType;
--  if (codec.preferredPayloadType !== undefined) {
--    pt = codec.preferredPayloadType;
--  }
--  var channels = codec.channels || codec.numChannels || 1;
--  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +
--      (channels !== 1 ? '/' + channels : '') + '\r\n';
--};
--
--// Parses an a=extmap line (headerextension from RFC 5285). Sample input:
--// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
--// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset
--SDPUtils.parseExtmap = function(line) {
--  var parts = line.substr(9).split(' ');
--  return {
--    id: parseInt(parts[0], 10),
--    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',
--    uri: parts[1]
--  };
--};
--
--// Generates a=extmap line from RTCRtpHeaderExtensionParameters or
--// RTCRtpHeaderExtension.
--SDPUtils.writeExtmap = function(headerExtension) {
--  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +
--      (headerExtension.direction && headerExtension.direction !== 'sendrecv'
--        ? '/' + headerExtension.direction
--        : '') +
--      ' ' + headerExtension.uri + '\r\n';
--};
--
--// Parses an ftmp line, returns dictionary. Sample input:
--// a=fmtp:96 vbr=on;cng=on
--// Also deals with vbr=on; cng=on
--SDPUtils.parseFmtp = function(line) {
--  var parsed = {};
--  var kv;
--  var parts = line.substr(line.indexOf(' ') + 1).split(';');
--  for (var j = 0; j < parts.length; j++) {
--    kv = parts[j].trim().split('=');
--    parsed[kv[0].trim()] = kv[1];
--  }
--  return parsed;
--};
--
--// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.
--SDPUtils.writeFmtp = function(codec) {
--  var line = '';
--  var pt = codec.payloadType;
--  if (codec.preferredPayloadType !== undefined) {
--    pt = codec.preferredPayloadType;
--  }
--  if (codec.parameters && Object.keys(codec.parameters).length) {
--    var params = [];
--    Object.keys(codec.parameters).forEach(function(param) {
--      if (codec.parameters[param]) {
--        params.push(param + '=' + codec.parameters[param]);
--      } else {
--        params.push(param);
--      }
--    });
--    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\r\n';
--  }
--  return line;
--};
--
--// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:
--// a=rtcp-fb:98 nack rpsi
--SDPUtils.parseRtcpFb = function(line) {
--  var parts = line.substr(line.indexOf(' ') + 1).split(' ');
--  return {
--    type: parts.shift(),
--    parameter: parts.join(' ')
--  };
--};
--// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.
--SDPUtils.writeRtcpFb = function(codec) {
--  var lines = '';
--  var pt = codec.payloadType;
--  if (codec.preferredPayloadType !== undefined) {
--    pt = codec.preferredPayloadType;
--  }
--  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {
--    // FIXME: special handling for trr-int?
--    codec.rtcpFeedback.forEach(function(fb) {
--      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +
--      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +
--          '\r\n';
--    });
--  }
--  return lines;
--};
--
--// Parses an RFC 5576 ssrc media attribute. Sample input:
--// a=ssrc:3735928559 cname:something
--SDPUtils.parseSsrcMedia = function(line) {
--  var sp = line.indexOf(' ');
--  var parts = {
--    ssrc: parseInt(line.substr(7, sp - 7), 10)
--  };
--  var colon = line.indexOf(':', sp);
--  if (colon > -1) {
--    parts.attribute = line.substr(sp + 1, colon - sp - 1);
--    parts.value = line.substr(colon + 1);
--  } else {
--    parts.attribute = line.substr(sp + 1);
--  }
--  return parts;
--};
--
--SDPUtils.parseSsrcGroup = function(line) {
--  var parts = line.substr(13).split(' ');
--  return {
--    semantics: parts.shift(),
--    ssrcs: parts.map(function(ssrc) {
--      return parseInt(ssrc, 10);
--    })
--  };
--};
--
--// Extracts the MID (RFC 5888) from a media section.
--// returns the MID or undefined if no mid line was found.
--SDPUtils.getMid = function(mediaSection) {
--  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];
--  if (mid) {
--    return mid.substr(6);
--  }
--};
--
--SDPUtils.parseFingerprint = function(line) {
--  var parts = line.substr(14).split(' ');
--  return {
--    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.
--    value: parts[1]
--  };
--};
--
--// Extracts DTLS parameters from SDP media section or sessionpart.
--// FIXME: for consistency with other functions this should only
--//   get the fingerprint line as input. See also getIceParameters.
--SDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {
--  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,
--    'a=fingerprint:');
--  // Note: a=setup line is ignored since we use the 'auto' role.
--  // Note2: 'algorithm' is not case sensitive except in Edge.
--  return {
--    role: 'auto',
--    fingerprints: lines.map(SDPUtils.parseFingerprint)
--  };
--};
--
--// Serializes DTLS parameters to SDP.
--SDPUtils.writeDtlsParameters = function(params, setupType) {
--  var sdp = 'a=setup:' + setupType + '\r\n';
--  params.fingerprints.forEach(function(fp) {
--    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\r\n';
--  });
--  return sdp;
--};
--
--// Parses a=crypto lines into
--//   https://rawgit.com/aboba/edgertc/master/msortc-rs4.html#dictionary-rtcsrtpsdesparameters-members
--SDPUtils.parseCryptoLine = function(line) {
--  var parts = line.substr(9).split(' ');
--  return {
--    tag: parseInt(parts[0], 10),
--    cryptoSuite: parts[1],
--    keyParams: parts[2],
--    sessionParams: parts.slice(3),
--  };
--};
--
--SDPUtils.writeCryptoLine = function(parameters) {
--  return 'a=crypto:' + parameters.tag + ' ' +
--    parameters.cryptoSuite + ' ' +
--    (typeof parameters.keyParams === 'object'
--      ? SDPUtils.writeCryptoKeyParams(parameters.keyParams)
--      : parameters.keyParams) +
--    (parameters.sessionParams ? ' ' + parameters.sessionParams.join(' ') : '') +
--    '\r\n';
--};
--
--// Parses the crypto key parameters into
--//   https://rawgit.com/aboba/edgertc/master/msortc-rs4.html#rtcsrtpkeyparam*
--SDPUtils.parseCryptoKeyParams = function(keyParams) {
--  if (keyParams.indexOf('inline:') !== 0) {
--    return null;
--  }
--  var parts = keyParams.substr(7).split('|');
--  return {
--    keyMethod: 'inline',
--    keySalt: parts[0],
--    lifeTime: parts[1],
--    mkiValue: parts[2] ? parts[2].split(':')[0] : undefined,
--    mkiLength: parts[2] ? parts[2].split(':')[1] : undefined,
--  };
--};
--
--SDPUtils.writeCryptoKeyParams = function(keyParams) {
--  return keyParams.keyMethod + ':'
--    + keyParams.keySalt +
--    (keyParams.lifeTime ? '|' + keyParams.lifeTime : '') +
--    (keyParams.mkiValue && keyParams.mkiLength
--      ? '|' + keyParams.mkiValue + ':' + keyParams.mkiLength
--      : '');
--};
--
--// Extracts all SDES paramters.
--SDPUtils.getCryptoParameters = function(mediaSection, sessionpart) {
--  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,
--    'a=crypto:');
--  return lines.map(SDPUtils.parseCryptoLine);
--};
--
--// Parses ICE information from SDP media section or sessionpart.
--// FIXME: for consistency with other functions this should only
--//   get the ice-ufrag and ice-pwd lines as input.
--SDPUtils.getIceParameters = function(mediaSection, sessionpart) {
--  var ufrag = SDPUtils.matchPrefix(mediaSection + sessionpart,
--    'a=ice-ufrag:')[0];
--  var pwd = SDPUtils.matchPrefix(mediaSection + sessionpart,
--    'a=ice-pwd:')[0];
--  if (!(ufrag && pwd)) {
--    return null;
--  }
--  return {
--    usernameFragment: ufrag.substr(12),
--    password: pwd.substr(10),
--  };
--};
--
--// Serializes ICE parameters to SDP.
--SDPUtils.writeIceParameters = function(params) {
--  return 'a=ice-ufrag:' + params.usernameFragment + '\r\n' +
--      'a=ice-pwd:' + params.password + '\r\n';
--};
--
--// Parses the SDP media section and returns RTCRtpParameters.
--SDPUtils.parseRtpParameters = function(mediaSection) {
--  var description = {
--    codecs: [],
--    headerExtensions: [],
--    fecMechanisms: [],
--    rtcp: []
--  };
--  var lines = SDPUtils.splitLines(mediaSection);
--  var mline = lines[0].split(' ');
--  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]
--    var pt = mline[i];
--    var rtpmapline = SDPUtils.matchPrefix(
--      mediaSection, 'a=rtpmap:' + pt + ' ')[0];
--    if (rtpmapline) {
--      var codec = SDPUtils.parseRtpMap(rtpmapline);
--      var fmtps = SDPUtils.matchPrefix(
--        mediaSection, 'a=fmtp:' + pt + ' ');
--      // Only the first a=fmtp:<pt> is considered.
--      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};
--      codec.rtcpFeedback = SDPUtils.matchPrefix(
--        mediaSection, 'a=rtcp-fb:' + pt + ' ')
--        .map(SDPUtils.parseRtcpFb);
--      description.codecs.push(codec);
--      // parse FEC mechanisms from rtpmap lines.
--      switch (codec.name.toUpperCase()) {
--        case 'RED':
--        case 'ULPFEC':
--          description.fecMechanisms.push(codec.name.toUpperCase());
--          break;
--        default: // only RED and ULPFEC are recognized as FEC mechanisms.
--          break;
--      }
--    }
--  }
--  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {
--    description.headerExtensions.push(SDPUtils.parseExtmap(line));
--  });
--  // FIXME: parse rtcp.
--  return description;
--};
--
--// Generates parts of the SDP media section describing the capabilities /
--// parameters.
--SDPUtils.writeRtpDescription = function(kind, caps) {
--  var sdp = '';
--
--  // Build the mline.
--  sdp += 'm=' + kind + ' ';
--  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.
--  sdp += ' UDP/TLS/RTP/SAVPF ';
--  sdp += caps.codecs.map(function(codec) {
--    if (codec.preferredPayloadType !== undefined) {
--      return codec.preferredPayloadType;
--    }
--    return codec.payloadType;
--  }).join(' ') + '\r\n';
--
--  sdp += 'c=IN IP4 0.0.0.0\r\n';
--  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\r\n';
--
--  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.
--  caps.codecs.forEach(function(codec) {
--    sdp += SDPUtils.writeRtpMap(codec);
--    sdp += SDPUtils.writeFmtp(codec);
--    sdp += SDPUtils.writeRtcpFb(codec);
--  });
--  var maxptime = 0;
--  caps.codecs.forEach(function(codec) {
--    if (codec.maxptime > maxptime) {
--      maxptime = codec.maxptime;
--    }
--  });
--  if (maxptime > 0) {
--    sdp += 'a=maxptime:' + maxptime + '\r\n';
--  }
--  sdp += 'a=rtcp-mux\r\n';
--
--  if (caps.headerExtensions) {
--    caps.headerExtensions.forEach(function(extension) {
--      sdp += SDPUtils.writeExtmap(extension);
--    });
--  }
--  // FIXME: write fecMechanisms.
--  return sdp;
--};
--
--// Parses the SDP media section and returns an array of
--// RTCRtpEncodingParameters.
--SDPUtils.parseRtpEncodingParameters = function(mediaSection) {
--  var encodingParameters = [];
--  var description = SDPUtils.parseRtpParameters(mediaSection);
--  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;
--  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;
--
--  // filter a=ssrc:... cname:, ignore PlanB-msid
--  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
--    .map(function(line) {
--      return SDPUtils.parseSsrcMedia(line);
--    })
--    .filter(function(parts) {
--      return parts.attribute === 'cname';
--    });
--  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;
--  var secondarySsrc;
--
--  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')
--    .map(function(line) {
--      var parts = line.substr(17).split(' ');
--      return parts.map(function(part) {
--        return parseInt(part, 10);
--      });
--    });
--  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {
--    secondarySsrc = flows[0][1];
--  }
--
--  description.codecs.forEach(function(codec) {
--    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {
--      var encParam = {
--        ssrc: primarySsrc,
--        codecPayloadType: parseInt(codec.parameters.apt, 10)
--      };
--      if (primarySsrc && secondarySsrc) {
--        encParam.rtx = {ssrc: secondarySsrc};
--      }
--      encodingParameters.push(encParam);
--      if (hasRed) {
--        encParam = JSON.parse(JSON.stringify(encParam));
--        encParam.fec = {
--          ssrc: primarySsrc,
--          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'
--        };
--        encodingParameters.push(encParam);
--      }
--    }
--  });
--  if (encodingParameters.length === 0 && primarySsrc) {
--    encodingParameters.push({
--      ssrc: primarySsrc
--    });
--  }
--
--  // we support both b=AS and b=TIAS but interpret AS as TIAS.
--  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');
--  if (bandwidth.length) {
--    if (bandwidth[0].indexOf('b=TIAS:') === 0) {
--      bandwidth = parseInt(bandwidth[0].substr(7), 10);
--    } else if (bandwidth[0].indexOf('b=AS:') === 0) {
--      // use formula from JSEP to convert b=AS to TIAS value.
--      bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95
--          - (50 * 40 * 8);
--    } else {
--      bandwidth = undefined;
--    }
--    encodingParameters.forEach(function(params) {
--      params.maxBitrate = bandwidth;
--    });
--  }
--  return encodingParameters;
--};
--
--// parses http://draft.ortc.org/#rtcrtcpparameters*
--SDPUtils.parseRtcpParameters = function(mediaSection) {
--  var rtcpParameters = {};
--
--  // Gets the first SSRC. Note tha with RTX there might be multiple
--  // SSRCs.
--  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
--    .map(function(line) {
--      return SDPUtils.parseSsrcMedia(line);
--    })
--    .filter(function(obj) {
--      return obj.attribute === 'cname';
--    })[0];
--  if (remoteSsrc) {
--    rtcpParameters.cname = remoteSsrc.value;
--    rtcpParameters.ssrc = remoteSsrc.ssrc;
--  }
--
--  // Edge uses the compound attribute instead of reducedSize
--  // compound is !reducedSize
--  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');
--  rtcpParameters.reducedSize = rsize.length > 0;
--  rtcpParameters.compound = rsize.length === 0;
--
--  // parses the rtcp-mux attrіbute.
--  // Note that Edge does not support unmuxed RTCP.
--  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');
--  rtcpParameters.mux = mux.length > 0;
--
--  return rtcpParameters;
--};
--
--// parses either a=msid: or a=ssrc:... msid lines and returns
--// the id of the MediaStream and MediaStreamTrack.
--SDPUtils.parseMsid = function(mediaSection) {
--  var parts;
--  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');
--  if (spec.length === 1) {
--    parts = spec[0].substr(7).split(' ');
--    return {stream: parts[0], track: parts[1]};
--  }
--  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
--    .map(function(line) {
--      return SDPUtils.parseSsrcMedia(line);
--    })
--    .filter(function(msidParts) {
--      return msidParts.attribute === 'msid';
--    });
--  if (planB.length > 0) {
--    parts = planB[0].value.split(' ');
--    return {stream: parts[0], track: parts[1]};
--  }
--};
--
--// SCTP
--// parses draft-ietf-mmusic-sctp-sdp-26 first and falls back
--// to draft-ietf-mmusic-sctp-sdp-05
--SDPUtils.parseSctpDescription = function(mediaSection) {
--  var mline = SDPUtils.parseMLine(mediaSection);
--  var maxSizeLine = SDPUtils.matchPrefix(mediaSection, 'a=max-message-size:');
--  var maxMessageSize;
--  if (maxSizeLine.length > 0) {
--    maxMessageSize = parseInt(maxSizeLine[0].substr(19), 10);
--  }
--  if (isNaN(maxMessageSize)) {
--    maxMessageSize = 65536;
--  }
--  var sctpPort = SDPUtils.matchPrefix(mediaSection, 'a=sctp-port:');
--  if (sctpPort.length > 0) {
--    return {
--      port: parseInt(sctpPort[0].substr(12), 10),
--      protocol: mline.fmt,
--      maxMessageSize: maxMessageSize
--    };
--  }
--  var sctpMapLines = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:');
--  if (sctpMapLines.length > 0) {
--    var parts = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:')[0]
--      .substr(10)
--      .split(' ');
--    return {
--      port: parseInt(parts[0], 10),
--      protocol: parts[1],
--      maxMessageSize: maxMessageSize
--    };
--  }
--};
--
--// SCTP
--// outputs the draft-ietf-mmusic-sctp-sdp-26 version that all browsers
--// support by now receiving in this format, unless we originally parsed
--// as the draft-ietf-mmusic-sctp-sdp-05 format (indicated by the m-line
--// protocol of DTLS/SCTP -- without UDP/ or TCP/)
--SDPUtils.writeSctpDescription = function(media, sctp) {
--  var output = [];
--  if (media.protocol !== 'DTLS/SCTP') {
--    output = [
--      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.protocol + '\r\n',
--      'c=IN IP4 0.0.0.0\r\n',
--      'a=sctp-port:' + sctp.port + '\r\n'
--    ];
--  } else {
--    output = [
--      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.port + '\r\n',
--      'c=IN IP4 0.0.0.0\r\n',
--      'a=sctpmap:' + sctp.port + ' ' + sctp.protocol + ' 65535\r\n'
--    ];
--  }
--  if (sctp.maxMessageSize !== undefined) {
--    output.push('a=max-message-size:' + sctp.maxMessageSize + '\r\n');
--  }
--  return output.join('');
--};
--
--// Generate a session ID for SDP.
--// https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1
--// recommends using a cryptographically random +ve 64-bit value
--// but right now this should be acceptable and within the right range
--SDPUtils.generateSessionId = function() {
--  return Math.random().toString().substr(2, 21);
--};
--
--// Write boilder plate for start of SDP
--// sessId argument is optional - if not supplied it will
--// be generated randomly
--// sessVersion is optional and defaults to 2
--// sessUser is optional and defaults to 'thisisadapterortc'
--SDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {
--  var sessionId;
--  var version = sessVer !== undefined ? sessVer : 2;
--  if (sessId) {
--    sessionId = sessId;
--  } else {
--    sessionId = SDPUtils.generateSessionId();
--  }
--  var user = sessUser || 'thisisadapterortc';
--  // FIXME: sess-id should be an NTP timestamp.
--  return 'v=0\r\n' +
--      'o=' + user + ' ' + sessionId + ' ' + version +
--        ' IN IP4 127.0.0.1\r\n' +
--      's=-\r\n' +
--      't=0 0\r\n';
--};
--
--SDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {
--  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);
--
--  // Map ICE parameters (ufrag, pwd) to SDP.
--  sdp += SDPUtils.writeIceParameters(
--    transceiver.iceGatherer.getLocalParameters());
--
--  // Map DTLS parameters to SDP.
--  sdp += SDPUtils.writeDtlsParameters(
--    transceiver.dtlsTransport.getLocalParameters(),
--    type === 'offer' ? 'actpass' : 'active');
--
--  sdp += 'a=mid:' + transceiver.mid + '\r\n';
--
--  if (transceiver.direction) {
--    sdp += 'a=' + transceiver.direction + '\r\n';
--  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {
--    sdp += 'a=sendrecv\r\n';
--  } else if (transceiver.rtpSender) {
--    sdp += 'a=sendonly\r\n';
--  } else if (transceiver.rtpReceiver) {
--    sdp += 'a=recvonly\r\n';
--  } else {
--    sdp += 'a=inactive\r\n';
--  }
--
--  if (transceiver.rtpSender) {
--    // spec.
--    var msid = 'msid:' + stream.id + ' ' +
--        transceiver.rtpSender.track.id + '\r\n';
--    sdp += 'a=' + msid;
--
--    // for Chrome.
--    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
--        ' ' + msid;
--    if (transceiver.sendEncodingParameters[0].rtx) {
--      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
--          ' ' + msid;
--      sdp += 'a=ssrc-group:FID ' +
--          transceiver.sendEncodingParameters[0].ssrc + ' ' +
--          transceiver.sendEncodingParameters[0].rtx.ssrc +
--          '\r\n';
--    }
--  }
--  // FIXME: this should be written by writeRtpDescription.
--  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
--      ' cname:' + SDPUtils.localCName + '\r\n';
--  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
--    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
--        ' cname:' + SDPUtils.localCName + '\r\n';
--  }
--  return sdp;
--};
--
--// Gets the direction from the mediaSection or the sessionpart.
--SDPUtils.getDirection = function(mediaSection, sessionpart) {
--  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.
--  var lines = SDPUtils.splitLines(mediaSection);
--  for (var i = 0; i < lines.length; i++) {
--    switch (lines[i]) {
--      case 'a=sendrecv':
--      case 'a=sendonly':
--      case 'a=recvonly':
--      case 'a=inactive':
--        return lines[i].substr(2);
--      default:
--        // FIXME: What should happen here?
--    }
--  }
--  if (sessionpart) {
--    return SDPUtils.getDirection(sessionpart);
--  }
--  return 'sendrecv';
--};
--
--SDPUtils.getKind = function(mediaSection) {
--  var lines = SDPUtils.splitLines(mediaSection);
--  var mline = lines[0].split(' ');
--  return mline[0].substr(2);
--};
--
--SDPUtils.isRejected = function(mediaSection) {
--  return mediaSection.split(' ', 2)[1] === '0';
--};
--
--SDPUtils.parseMLine = function(mediaSection) {
--  var lines = SDPUtils.splitLines(mediaSection);
--  var parts = lines[0].substr(2).split(' ');
--  return {
--    kind: parts[0],
--    port: parseInt(parts[1], 10),
--    protocol: parts[2],
--    fmt: parts.slice(3).join(' ')
--  };
--};
--
--SDPUtils.parseOLine = function(mediaSection) {
--  var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];
--  var parts = line.substr(2).split(' ');
--  return {
--    username: parts[0],
--    sessionId: parts[1],
--    sessionVersion: parseInt(parts[2], 10),
--    netType: parts[3],
--    addressType: parts[4],
--    address: parts[5]
--  };
--};
--
--// a very naive interpretation of a valid SDP.
--SDPUtils.isValidSDP = function(blob) {
--  if (typeof blob !== 'string' || blob.length === 0) {
--    return false;
--  }
--  var lines = SDPUtils.splitLines(blob);
--  for (var i = 0; i < lines.length; i++) {
--    if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {
--      return false;
--    }
--    // TODO: check the modifier a bit more.
--  }
--  return true;
--};
--
--// Expose public methods.
--if (typeof module === 'object') {
--  module.exports = SDPUtils;
--}
--
--},{}],"NJ2u":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--var SDPUtils = require('sdp');
--
--function fixStatsType(stat) {
--  return {
--    inboundrtp: 'inbound-rtp',
--    outboundrtp: 'outbound-rtp',
--    candidatepair: 'candidate-pair',
--    localcandidate: 'local-candidate',
--    remotecandidate: 'remote-candidate'
--  }[stat.type] || stat.type;
--}
--
--function writeMediaSection(transceiver, caps, type, stream, dtlsRole) {
--  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps); // Map ICE parameters (ufrag, pwd) to SDP.
--
--  sdp += SDPUtils.writeIceParameters(transceiver.iceGatherer.getLocalParameters()); // Map DTLS parameters to SDP.
--
--  sdp += SDPUtils.writeDtlsParameters(transceiver.dtlsTransport.getLocalParameters(), type === 'offer' ? 'actpass' : dtlsRole || 'active');
--  sdp += 'a=mid:' + transceiver.mid + '\r\n';
--
--  if (transceiver.rtpSender && transceiver.rtpReceiver) {
--    sdp += 'a=sendrecv\r\n';
--  } else if (transceiver.rtpSender) {
--    sdp += 'a=sendonly\r\n';
--  } else if (transceiver.rtpReceiver) {
--    sdp += 'a=recvonly\r\n';
--  } else {
--    sdp += 'a=inactive\r\n';
--  }
--
--  if (transceiver.rtpSender) {
--    var trackId = transceiver.rtpSender._initialTrackId || transceiver.rtpSender.track.id;
--    transceiver.rtpSender._initialTrackId = trackId; // spec.
--
--    var msid = 'msid:' + (stream ? stream.id : '-') + ' ' + trackId + '\r\n';
--    sdp += 'a=' + msid; // for Chrome. Legacy should no longer be required.
--
--    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc + ' ' + msid; // RTX
--
--    if (transceiver.sendEncodingParameters[0].rtx) {
--      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc + ' ' + msid;
--      sdp += 'a=ssrc-group:FID ' + transceiver.sendEncodingParameters[0].ssrc + ' ' + transceiver.sendEncodingParameters[0].rtx.ssrc + '\r\n';
--    }
--  } // FIXME: this should be written by writeRtpDescription.
--
--
--  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc + ' cname:' + SDPUtils.localCName + '\r\n';
--
--  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
--    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc + ' cname:' + SDPUtils.localCName + '\r\n';
--  }
--
--  return sdp;
--} // Edge does not like
--// 1) stun: filtered after 14393 unless ?transport=udp is present
--// 2) turn: that does not have all of turn:host:port?transport=udp
--// 3) turn: with ipv6 addresses
--// 4) turn: occurring muliple times
--
--
--function filterIceServers(iceServers, edgeVersion) {
--  var hasTurn = false;
--  iceServers = JSON.parse(JSON.stringify(iceServers));
--  return iceServers.filter(function (server) {
--    if (server && (server.urls || server.url)) {
--      var urls = server.urls || server.url;
--
--      if (server.url && !server.urls) {
--        console.warn('RTCIceServer.url is deprecated! Use urls instead.');
--      }
--
--      var isString = typeof urls === 'string';
--
--      if (isString) {
--        urls = [urls];
--      }
--
--      urls = urls.filter(function (url) {
--        var validTurn = url.indexOf('turn:') === 0 && url.indexOf('transport=udp') !== -1 && url.indexOf('turn:[') === -1 && !hasTurn;
--
--        if (validTurn) {
--          hasTurn = true;
--          return true;
--        }
--
--        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 && url.indexOf('?transport=udp') === -1;
--      });
--      delete server.url;
--      server.urls = isString ? urls[0] : urls;
--      return !!urls.length;
--    }
--  });
--} // Determines the intersection of local and remote capabilities.
--
--
--function getCommonCapabilities(localCapabilities, remoteCapabilities) {
--  var commonCapabilities = {
--    codecs: [],
--    headerExtensions: [],
--    fecMechanisms: []
--  };
--
--  var findCodecByPayloadType = function (pt, codecs) {
--    pt = parseInt(pt, 10);
--
--    for (var i = 0; i < codecs.length; i++) {
--      if (codecs[i].payloadType === pt || codecs[i].preferredPayloadType === pt) {
--        return codecs[i];
--      }
--    }
--  };
--
--  var rtxCapabilityMatches = function (lRtx, rRtx, lCodecs, rCodecs) {
--    var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);
--    var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);
--    return lCodec && rCodec && lCodec.name.toLowerCase() === rCodec.name.toLowerCase();
--  };
--
--  localCapabilities.codecs.forEach(function (lCodec) {
--    for (var i = 0; i < remoteCapabilities.codecs.length; i++) {
--      var rCodec = remoteCapabilities.codecs[i];
--
--      if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() && lCodec.clockRate === rCodec.clockRate) {
--        if (lCodec.name.toLowerCase() === 'rtx' && lCodec.parameters && rCodec.parameters.apt) {
--          // for RTX we need to find the local rtx that has a apt
--          // which points to the same local codec as the remote one.
--          if (!rtxCapabilityMatches(lCodec, rCodec, localCapabilities.codecs, remoteCapabilities.codecs)) {
--            continue;
--          }
--        }
--
--        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy
--        // number of channels is the highest common number of channels
--
--        rCodec.numChannels = Math.min(lCodec.numChannels, rCodec.numChannels); // push rCodec so we reply with offerer payload type
--
--        commonCapabilities.codecs.push(rCodec); // determine common feedback mechanisms
--
--        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function (fb) {
--          for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {
--            if (lCodec.rtcpFeedback[j].type === fb.type && lCodec.rtcpFeedback[j].parameter === fb.parameter) {
--              return true;
--            }
--          }
--
--          return false;
--        }); // FIXME: also need to determine .parameters
--        //  see https://github.com/openpeer/ortc/issues/569
--
--        break;
--      }
--    }
--  });
--  localCapabilities.headerExtensions.forEach(function (lHeaderExtension) {
--    for (var i = 0; i < remoteCapabilities.headerExtensions.length; i++) {
--      var rHeaderExtension = remoteCapabilities.headerExtensions[i];
--
--      if (lHeaderExtension.uri === rHeaderExtension.uri) {
--        commonCapabilities.headerExtensions.push(rHeaderExtension);
--        break;
--      }
--    }
--  }); // FIXME: fecMechanisms
--
--  return commonCapabilities;
--} // is action=setLocalDescription with type allowed in signalingState
--
--
--function isActionAllowedInSignalingState(action, type, signalingState) {
--  return {
--    offer: {
--      setLocalDescription: ['stable', 'have-local-offer'],
--      setRemoteDescription: ['stable', 'have-remote-offer']
--    },
--    answer: {
--      setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],
--      setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']
--    }
--  }[type][action].indexOf(signalingState) !== -1;
--}
--
--function maybeAddCandidate(iceTransport, candidate) {
--  // Edge's internal representation adds some fields therefore
--  // not all fieldѕ are taken into account.
--  var alreadyAdded = iceTransport.getRemoteCandidates().find(function (remoteCandidate) {
--    return candidate.foundation === remoteCandidate.foundation && candidate.ip === remoteCandidate.ip && candidate.port === remoteCandidate.port && candidate.priority === remoteCandidate.priority && candidate.protocol === remoteCandidate.protocol && candidate.type === remoteCandidate.type;
--  });
--
--  if (!alreadyAdded) {
--    iceTransport.addRemoteCandidate(candidate);
--  }
--
--  return !alreadyAdded;
--}
--
--function makeError(name, description) {
--  var e = new Error(description);
--  e.name = name; // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names
--
--  e.code = {
--    NotSupportedError: 9,
--    InvalidStateError: 11,
--    InvalidAccessError: 15,
--    TypeError: undefined,
--    OperationError: undefined
--  }[name];
--  return e;
--}
--
--module.exports = function (window, edgeVersion) {
--  // https://w3c.github.io/mediacapture-main/#mediastream
--  // Helper function to add the track to the stream and
--  // dispatch the event ourselves.
--  function addTrackToStreamAndFireEvent(track, stream) {
--    stream.addTrack(track);
--    stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack', {
--      track: track
--    }));
--  }
--
--  function removeTrackFromStreamAndFireEvent(track, stream) {
--    stream.removeTrack(track);
--    stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack', {
--      track: track
--    }));
--  }
--
--  function fireAddTrack(pc, track, receiver, streams) {
--    var trackEvent = new Event('track');
--    trackEvent.track = track;
--    trackEvent.receiver = receiver;
--    trackEvent.transceiver = {
--      receiver: receiver
--    };
--    trackEvent.streams = streams;
--    window.setTimeout(function () {
--      pc._dispatchEvent('track', trackEvent);
--    });
--  }
--
--  var RTCPeerConnection = function (config) {
--    var pc = this;
--
--    var _eventTarget = document.createDocumentFragment();
--
--    ['addEventListener', 'removeEventListener', 'dispatchEvent'].forEach(function (method) {
--      pc[method] = _eventTarget[method].bind(_eventTarget);
--    });
--    this.canTrickleIceCandidates = null;
--    this.needNegotiation = false;
--    this.localStreams = [];
--    this.remoteStreams = [];
--    this._localDescription = null;
--    this._remoteDescription = null;
--    this.signalingState = 'stable';
--    this.iceConnectionState = 'new';
--    this.connectionState = 'new';
--    this.iceGatheringState = 'new';
--    config = JSON.parse(JSON.stringify(config || {}));
--    this.usingBundle = config.bundlePolicy === 'max-bundle';
--
--    if (config.rtcpMuxPolicy === 'negotiate') {
--      throw makeError('NotSupportedError', 'rtcpMuxPolicy \'negotiate\' is not supported');
--    } else if (!config.rtcpMuxPolicy) {
--      config.rtcpMuxPolicy = 'require';
--    }
--
--    switch (config.iceTransportPolicy) {
--      case 'all':
--      case 'relay':
--        break;
--
--      default:
--        config.iceTransportPolicy = 'all';
--        break;
--    }
--
--    switch (config.bundlePolicy) {
--      case 'balanced':
--      case 'max-compat':
--      case 'max-bundle':
--        break;
--
--      default:
--        config.bundlePolicy = 'balanced';
--        break;
--    }
--
--    config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);
--    this._iceGatherers = [];
--
--    if (config.iceCandidatePoolSize) {
--      for (var i = config.iceCandidatePoolSize; i > 0; i--) {
--        this._iceGatherers.push(new window.RTCIceGatherer({
--          iceServers: config.iceServers,
--          gatherPolicy: config.iceTransportPolicy
--        }));
--      }
--    } else {
--      config.iceCandidatePoolSize = 0;
--    }
--
--    this._config = config; // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...
--    // everything that is needed to describe a SDP m-line.
--
--    this.transceivers = [];
--    this._sdpSessionId = SDPUtils.generateSessionId();
--    this._sdpSessionVersion = 0;
--    this._dtlsRole = undefined; // role for a=setup to use in answers.
--
--    this._isClosed = false;
--  };
--
--  Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {
--    configurable: true,
--    get: function () {
--      return this._localDescription;
--    }
--  });
--  Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {
--    configurable: true,
--    get: function () {
--      return this._remoteDescription;
--    }
--  }); // set up event handlers on prototype
--
--  RTCPeerConnection.prototype.onicecandidate = null;
--  RTCPeerConnection.prototype.onaddstream = null;
--  RTCPeerConnection.prototype.ontrack = null;
--  RTCPeerConnection.prototype.onremovestream = null;
--  RTCPeerConnection.prototype.onsignalingstatechange = null;
--  RTCPeerConnection.prototype.oniceconnectionstatechange = null;
--  RTCPeerConnection.prototype.onconnectionstatechange = null;
--  RTCPeerConnection.prototype.onicegatheringstatechange = null;
--  RTCPeerConnection.prototype.onnegotiationneeded = null;
--  RTCPeerConnection.prototype.ondatachannel = null;
--
--  RTCPeerConnection.prototype._dispatchEvent = function (name, event) {
--    if (this._isClosed) {
--      return;
--    }
--
--    this.dispatchEvent(event);
--
--    if (typeof this['on' + name] === 'function') {
--      this['on' + name](event);
--    }
--  };
--
--  RTCPeerConnection.prototype._emitGatheringStateChange = function () {
--    var event = new Event('icegatheringstatechange');
--
--    this._dispatchEvent('icegatheringstatechange', event);
--  };
--
--  RTCPeerConnection.prototype.getConfiguration = function () {
--    return this._config;
--  };
--
--  RTCPeerConnection.prototype.getLocalStreams = function () {
--    return this.localStreams;
--  };
--
--  RTCPeerConnection.prototype.getRemoteStreams = function () {
--    return this.remoteStreams;
--  }; // internal helper to create a transceiver object.
--  // (which is not yet the same as the WebRTC 1.0 transceiver)
--
--
--  RTCPeerConnection.prototype._createTransceiver = function (kind, doNotAdd) {
--    var hasBundleTransport = this.transceivers.length > 0;
--    var transceiver = {
--      track: null,
--      iceGatherer: null,
--      iceTransport: null,
--      dtlsTransport: null,
--      localCapabilities: null,
--      remoteCapabilities: null,
--      rtpSender: null,
--      rtpReceiver: null,
--      kind: kind,
--      mid: null,
--      sendEncodingParameters: null,
--      recvEncodingParameters: null,
--      stream: null,
--      associatedRemoteMediaStreams: [],
--      wantReceive: true
--    };
--
--    if (this.usingBundle && hasBundleTransport) {
--      transceiver.iceTransport = this.transceivers[0].iceTransport;
--      transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;
--    } else {
--      var transports = this._createIceAndDtlsTransports();
--
--      transceiver.iceTransport = transports.iceTransport;
--      transceiver.dtlsTransport = transports.dtlsTransport;
--    }
--
--    if (!doNotAdd) {
--      this.transceivers.push(transceiver);
--    }
--
--    return transceiver;
--  };
--
--  RTCPeerConnection.prototype.addTrack = function (track, stream) {
--    if (this._isClosed) {
--      throw makeError('InvalidStateError', 'Attempted to call addTrack on a closed peerconnection.');
--    }
--
--    var alreadyExists = this.transceivers.find(function (s) {
--      return s.track === track;
--    });
--
--    if (alreadyExists) {
--      throw makeError('InvalidAccessError', 'Track already exists.');
--    }
--
--    var transceiver;
--
--    for (var i = 0; i < this.transceivers.length; i++) {
--      if (!this.transceivers[i].track && this.transceivers[i].kind === track.kind) {
--        transceiver = this.transceivers[i];
--      }
--    }
--
--    if (!transceiver) {
--      transceiver = this._createTransceiver(track.kind);
--    }
--
--    this._maybeFireNegotiationNeeded();
--
--    if (this.localStreams.indexOf(stream) === -1) {
--      this.localStreams.push(stream);
--    }
--
--    transceiver.track = track;
--    transceiver.stream = stream;
--    transceiver.rtpSender = new window.RTCRtpSender(track, transceiver.dtlsTransport);
--    return transceiver.rtpSender;
--  };
--
--  RTCPeerConnection.prototype.addStream = function (stream) {
--    var pc = this;
--
--    if (edgeVersion >= 15025) {
--      stream.getTracks().forEach(function (track) {
--        pc.addTrack(track, stream);
--      });
--    } else {
--      // Clone is necessary for local demos mostly, attaching directly
--      // to two different senders does not work (build 10547).
--      // Fixed in 15025 (or earlier)
--      var clonedStream = stream.clone();
--      stream.getTracks().forEach(function (track, idx) {
--        var clonedTrack = clonedStream.getTracks()[idx];
--        track.addEventListener('enabled', function (event) {
--          clonedTrack.enabled = event.enabled;
--        });
--      });
--      clonedStream.getTracks().forEach(function (track) {
--        pc.addTrack(track, clonedStream);
--      });
--    }
--  };
--
--  RTCPeerConnection.prototype.removeTrack = function (sender) {
--    if (this._isClosed) {
--      throw makeError('InvalidStateError', 'Attempted to call removeTrack on a closed peerconnection.');
--    }
--
--    if (!(sender instanceof window.RTCRtpSender)) {
--      throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' + 'does not implement interface RTCRtpSender.');
--    }
--
--    var transceiver = this.transceivers.find(function (t) {
--      return t.rtpSender === sender;
--    });
--
--    if (!transceiver) {
--      throw makeError('InvalidAccessError', 'Sender was not created by this connection.');
--    }
--
--    var stream = transceiver.stream;
--    transceiver.rtpSender.stop();
--    transceiver.rtpSender = null;
--    transceiver.track = null;
--    transceiver.stream = null; // remove the stream from the set of local streams
--
--    var localStreams = this.transceivers.map(function (t) {
--      return t.stream;
--    });
--
--    if (localStreams.indexOf(stream) === -1 && this.localStreams.indexOf(stream) > -1) {
--      this.localStreams.splice(this.localStreams.indexOf(stream), 1);
--    }
--
--    this._maybeFireNegotiationNeeded();
--  };
--
--  RTCPeerConnection.prototype.removeStream = function (stream) {
--    var pc = this;
--    stream.getTracks().forEach(function (track) {
--      var sender = pc.getSenders().find(function (s) {
--        return s.track === track;
--      });
--
--      if (sender) {
--        pc.removeTrack(sender);
--      }
--    });
--  };
--
--  RTCPeerConnection.prototype.getSenders = function () {
--    return this.transceivers.filter(function (transceiver) {
--      return !!transceiver.rtpSender;
--    }).map(function (transceiver) {
--      return transceiver.rtpSender;
--    });
--  };
--
--  RTCPeerConnection.prototype.getReceivers = function () {
--    return this.transceivers.filter(function (transceiver) {
--      return !!transceiver.rtpReceiver;
--    }).map(function (transceiver) {
--      return transceiver.rtpReceiver;
--    });
--  };
--
--  RTCPeerConnection.prototype._createIceGatherer = function (sdpMLineIndex, usingBundle) {
--    var pc = this;
--
--    if (usingBundle && sdpMLineIndex > 0) {
--      return this.transceivers[0].iceGatherer;
--    } else if (this._iceGatherers.length) {
--      return this._iceGatherers.shift();
--    }
--
--    var iceGatherer = new window.RTCIceGatherer({
--      iceServers: this._config.iceServers,
--      gatherPolicy: this._config.iceTransportPolicy
--    });
--    Object.defineProperty(iceGatherer, 'state', {
--      value: 'new',
--      writable: true
--    });
--    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];
--
--    this.transceivers[sdpMLineIndex].bufferCandidates = function (event) {
--      var end = !event.candidate || Object.keys(event.candidate).length === 0; // polyfill since RTCIceGatherer.state is not implemented in
--      // Edge 10547 yet.
--
--      iceGatherer.state = end ? 'completed' : 'gathering';
--
--      if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {
--        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);
--      }
--    };
--
--    iceGatherer.addEventListener('localcandidate', this.transceivers[sdpMLineIndex].bufferCandidates);
--    return iceGatherer;
--  }; // start gathering from an RTCIceGatherer.
--
--
--  RTCPeerConnection.prototype._gather = function (mid, sdpMLineIndex) {
--    var pc = this;
--    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
--
--    if (iceGatherer.onlocalcandidate) {
--      return;
--    }
--
--    var bufferedCandidateEvents = this.transceivers[sdpMLineIndex].bufferedCandidateEvents;
--    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;
--    iceGatherer.removeEventListener('localcandidate', this.transceivers[sdpMLineIndex].bufferCandidates);
--
--    iceGatherer.onlocalcandidate = function (evt) {
--      if (pc.usingBundle && sdpMLineIndex > 0) {
--        // if we know that we use bundle we can drop candidates with
--        // ѕdpMLineIndex > 0. If we don't do this then our state gets
--        // confused since we dispose the extra ice gatherer.
--        return;
--      }
--
--      var event = new Event('icecandidate');
--      event.candidate = {
--        sdpMid: mid,
--        sdpMLineIndex: sdpMLineIndex
--      };
--      var cand = evt.candidate; // Edge emits an empty object for RTCIceCandidateComplete‥
--
--      var end = !cand || Object.keys(cand).length === 0;
--
--      if (end) {
--        // polyfill since RTCIceGatherer.state is not implemented in
--        // Edge 10547 yet.
--        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {
--          iceGatherer.state = 'completed';
--        }
--      } else {
--        if (iceGatherer.state === 'new') {
--          iceGatherer.state = 'gathering';
--        } // RTCIceCandidate doesn't have a component, needs to be added
--
--
--        cand.component = 1; // also the usernameFragment. TODO: update SDP to take both variants.
--
--        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;
--        var serializedCandidate = SDPUtils.writeCandidate(cand);
--        event.candidate = Object.assign(event.candidate, SDPUtils.parseCandidate(serializedCandidate));
--        event.candidate.candidate = serializedCandidate;
--
--        event.candidate.toJSON = function () {
--          return {
--            candidate: event.candidate.candidate,
--            sdpMid: event.candidate.sdpMid,
--            sdpMLineIndex: event.candidate.sdpMLineIndex,
--            usernameFragment: event.candidate.usernameFragment
--          };
--        };
--      } // update local description.
--
--
--      var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);
--
--      if (!end) {
--        sections[event.candidate.sdpMLineIndex] += 'a=' + event.candidate.candidate + '\r\n';
--      } else {
--        sections[event.candidate.sdpMLineIndex] += 'a=end-of-candidates\r\n';
--      }
--
--      pc._localDescription.sdp = SDPUtils.getDescription(pc._localDescription.sdp) + sections.join('');
--      var complete = pc.transceivers.every(function (transceiver) {
--        return transceiver.iceGatherer && transceiver.iceGatherer.state === 'completed';
--      });
--
--      if (pc.iceGatheringState !== 'gathering') {
--        pc.iceGatheringState = 'gathering';
--
--        pc._emitGatheringStateChange();
--      } // Emit candidate. Also emit null candidate when all gatherers are
--      // complete.
--
--
--      if (!end) {
--        pc._dispatchEvent('icecandidate', event);
--      }
--
--      if (complete) {
--        pc._dispatchEvent('icecandidate', new Event('icecandidate'));
--
--        pc.iceGatheringState = 'complete';
--
--        pc._emitGatheringStateChange();
--      }
--    }; // emit already gathered candidates.
--
--
--    window.setTimeout(function () {
--      bufferedCandidateEvents.forEach(function (e) {
--        iceGatherer.onlocalcandidate(e);
--      });
--    }, 0);
--  }; // Create ICE transport and DTLS transport.
--
--
--  RTCPeerConnection.prototype._createIceAndDtlsTransports = function () {
--    var pc = this;
--    var iceTransport = new window.RTCIceTransport(null);
--
--    iceTransport.onicestatechange = function () {
--      pc._updateIceConnectionState();
--
--      pc._updateConnectionState();
--    };
--
--    var dtlsTransport = new window.RTCDtlsTransport(iceTransport);
--
--    dtlsTransport.ondtlsstatechange = function () {
--      pc._updateConnectionState();
--    };
--
--    dtlsTransport.onerror = function () {
--      // onerror does not set state to failed by itself.
--      Object.defineProperty(dtlsTransport, 'state', {
--        value: 'failed',
--        writable: true
--      });
--
--      pc._updateConnectionState();
--    };
--
--    return {
--      iceTransport: iceTransport,
--      dtlsTransport: dtlsTransport
--    };
--  }; // Destroy ICE gatherer, ICE transport and DTLS transport.
--  // Without triggering the callbacks.
--
--
--  RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function (sdpMLineIndex) {
--    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
--
--    if (iceGatherer) {
--      delete iceGatherer.onlocalcandidate;
--      delete this.transceivers[sdpMLineIndex].iceGatherer;
--    }
--
--    var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;
--
--    if (iceTransport) {
--      delete iceTransport.onicestatechange;
--      delete this.transceivers[sdpMLineIndex].iceTransport;
--    }
--
--    var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;
--
--    if (dtlsTransport) {
--      delete dtlsTransport.ondtlsstatechange;
--      delete dtlsTransport.onerror;
--      delete this.transceivers[sdpMLineIndex].dtlsTransport;
--    }
--  }; // Start the RTP Sender and Receiver for a transceiver.
--
--
--  RTCPeerConnection.prototype._transceive = function (transceiver, send, recv) {
--    var params = getCommonCapabilities(transceiver.localCapabilities, transceiver.remoteCapabilities);
--
--    if (send && transceiver.rtpSender) {
--      params.encodings = transceiver.sendEncodingParameters;
--      params.rtcp = {
--        cname: SDPUtils.localCName,
--        compound: transceiver.rtcpParameters.compound
--      };
--
--      if (transceiver.recvEncodingParameters.length) {
--        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;
--      }
--
--      transceiver.rtpSender.send(params);
--    }
--
--    if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {
--      // remove RTX field in Edge 14942
--      if (transceiver.kind === 'video' && transceiver.recvEncodingParameters && edgeVersion < 15019) {
--        transceiver.recvEncodingParameters.forEach(function (p) {
--          delete p.rtx;
--        });
--      }
--
--      if (transceiver.recvEncodingParameters.length) {
--        params.encodings = transceiver.recvEncodingParameters;
--      } else {
--        params.encodings = [{}];
--      }
--
--      params.rtcp = {
--        compound: transceiver.rtcpParameters.compound
--      };
--
--      if (transceiver.rtcpParameters.cname) {
--        params.rtcp.cname = transceiver.rtcpParameters.cname;
--      }
--
--      if (transceiver.sendEncodingParameters.length) {
--        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;
--      }
--
--      transceiver.rtpReceiver.receive(params);
--    }
--  };
--
--  RTCPeerConnection.prototype.setLocalDescription = function (description) {
--    var pc = this; // Note: pranswer is not supported.
--
--    if (['offer', 'answer'].indexOf(description.type) === -1) {
--      return Promise.reject(makeError('TypeError', 'Unsupported type "' + description.type + '"'));
--    }
--
--    if (!isActionAllowedInSignalingState('setLocalDescription', description.type, pc.signalingState) || pc._isClosed) {
--      return Promise.reject(makeError('InvalidStateError', 'Can not set local ' + description.type + ' in state ' + pc.signalingState));
--    }
--
--    var sections;
--    var sessionpart;
--
--    if (description.type === 'offer') {
--      // VERY limited support for SDP munging. Limited to:
--      // * changing the order of codecs
--      sections = SDPUtils.splitSections(description.sdp);
--      sessionpart = sections.shift();
--      sections.forEach(function (mediaSection, sdpMLineIndex) {
--        var caps = SDPUtils.parseRtpParameters(mediaSection);
--        pc.transceivers[sdpMLineIndex].localCapabilities = caps;
--      });
--      pc.transceivers.forEach(function (transceiver, sdpMLineIndex) {
--        pc._gather(transceiver.mid, sdpMLineIndex);
--      });
--    } else if (description.type === 'answer') {
--      sections = SDPUtils.splitSections(pc._remoteDescription.sdp);
--      sessionpart = sections.shift();
--      var isIceLite = SDPUtils.matchPrefix(sessionpart, 'a=ice-lite').length > 0;
--      sections.forEach(function (mediaSection, sdpMLineIndex) {
--        var transceiver = pc.transceivers[sdpMLineIndex];
--        var iceGatherer = transceiver.iceGatherer;
--        var iceTransport = transceiver.iceTransport;
--        var dtlsTransport = transceiver.dtlsTransport;
--        var localCapabilities = transceiver.localCapabilities;
--        var remoteCapabilities = transceiver.remoteCapabilities; // treat bundle-only as not-rejected.
--
--        var rejected = SDPUtils.isRejected(mediaSection) && SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;
--
--        if (!rejected && !transceiver.rejected) {
--          var remoteIceParameters = SDPUtils.getIceParameters(mediaSection, sessionpart);
--          var remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection, sessionpart);
--
--          if (isIceLite) {
--            remoteDtlsParameters.role = 'server';
--          }
--
--          if (!pc.usingBundle || sdpMLineIndex === 0) {
--            pc._gather(transceiver.mid, sdpMLineIndex);
--
--            if (iceTransport.state === 'new') {
--              iceTransport.start(iceGatherer, remoteIceParameters, isIceLite ? 'controlling' : 'controlled');
--            }
--
--            if (dtlsTransport.state === 'new') {
--              dtlsTransport.start(remoteDtlsParameters);
--            }
--          } // Calculate intersection of capabilities.
--
--
--          var params = getCommonCapabilities(localCapabilities, remoteCapabilities); // Start the RTCRtpSender. The RTCRtpReceiver for this
--          // transceiver has already been started in setRemoteDescription.
--
--          pc._transceive(transceiver, params.codecs.length > 0, false);
--        }
--      });
--    }
--
--    pc._localDescription = {
--      type: description.type,
--      sdp: description.sdp
--    };
--
--    if (description.type === 'offer') {
--      pc._updateSignalingState('have-local-offer');
--    } else {
--      pc._updateSignalingState('stable');
--    }
--
--    return Promise.resolve();
--  };
--
--  RTCPeerConnection.prototype.setRemoteDescription = function (description) {
--    var pc = this; // Note: pranswer is not supported.
--
--    if (['offer', 'answer'].indexOf(description.type) === -1) {
--      return Promise.reject(makeError('TypeError', 'Unsupported type "' + description.type + '"'));
--    }
--
--    if (!isActionAllowedInSignalingState('setRemoteDescription', description.type, pc.signalingState) || pc._isClosed) {
--      return Promise.reject(makeError('InvalidStateError', 'Can not set remote ' + description.type + ' in state ' + pc.signalingState));
--    }
--
--    var streams = {};
--    pc.remoteStreams.forEach(function (stream) {
--      streams[stream.id] = stream;
--    });
--    var receiverList = [];
--    var sections = SDPUtils.splitSections(description.sdp);
--    var sessionpart = sections.shift();
--    var isIceLite = SDPUtils.matchPrefix(sessionpart, 'a=ice-lite').length > 0;
--    var usingBundle = SDPUtils.matchPrefix(sessionpart, 'a=group:BUNDLE ').length > 0;
--    pc.usingBundle = usingBundle;
--    var iceOptions = SDPUtils.matchPrefix(sessionpart, 'a=ice-options:')[0];
--
--    if (iceOptions) {
--      pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ').indexOf('trickle') >= 0;
--    } else {
--      pc.canTrickleIceCandidates = false;
--    }
--
--    sections.forEach(function (mediaSection, sdpMLineIndex) {
--      var lines = SDPUtils.splitLines(mediaSection);
--      var kind = SDPUtils.getKind(mediaSection); // treat bundle-only as not-rejected.
--
--      var rejected = SDPUtils.isRejected(mediaSection) && SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;
--      var protocol = lines[0].substr(2).split(' ')[2];
--      var direction = SDPUtils.getDirection(mediaSection, sessionpart);
--      var remoteMsid = SDPUtils.parseMsid(mediaSection);
--      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier(); // Reject datachannels which are not implemented yet.
--
--      if (rejected || kind === 'application' && (protocol === 'DTLS/SCTP' || protocol === 'UDP/DTLS/SCTP')) {
--        // TODO: this is dangerous in the case where a non-rejected m-line
--        //     becomes rejected.
--        pc.transceivers[sdpMLineIndex] = {
--          mid: mid,
--          kind: kind,
--          protocol: protocol,
--          rejected: true
--        };
--        return;
--      }
--
--      if (!rejected && pc.transceivers[sdpMLineIndex] && pc.transceivers[sdpMLineIndex].rejected) {
--        // recycle a rejected transceiver.
--        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);
--      }
--
--      var transceiver;
--      var iceGatherer;
--      var iceTransport;
--      var dtlsTransport;
--      var rtpReceiver;
--      var sendEncodingParameters;
--      var recvEncodingParameters;
--      var localCapabilities;
--      var track; // FIXME: ensure the mediaSection has rtcp-mux set.
--
--      var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);
--      var remoteIceParameters;
--      var remoteDtlsParameters;
--
--      if (!rejected) {
--        remoteIceParameters = SDPUtils.getIceParameters(mediaSection, sessionpart);
--        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection, sessionpart);
--        remoteDtlsParameters.role = 'client';
--      }
--
--      recvEncodingParameters = SDPUtils.parseRtpEncodingParameters(mediaSection);
--      var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);
--      var isComplete = SDPUtils.matchPrefix(mediaSection, 'a=end-of-candidates', sessionpart).length > 0;
--      var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:').map(function (cand) {
--        return SDPUtils.parseCandidate(cand);
--      }).filter(function (cand) {
--        return cand.component === 1;
--      }); // Check if we can use BUNDLE and dispose transports.
--
--      if ((description.type === 'offer' || description.type === 'answer') && !rejected && usingBundle && sdpMLineIndex > 0 && pc.transceivers[sdpMLineIndex]) {
--        pc._disposeIceAndDtlsTransports(sdpMLineIndex);
--
--        pc.transceivers[sdpMLineIndex].iceGatherer = pc.transceivers[0].iceGatherer;
--        pc.transceivers[sdpMLineIndex].iceTransport = pc.transceivers[0].iceTransport;
--        pc.transceivers[sdpMLineIndex].dtlsTransport = pc.transceivers[0].dtlsTransport;
--
--        if (pc.transceivers[sdpMLineIndex].rtpSender) {
--          pc.transceivers[sdpMLineIndex].rtpSender.setTransport(pc.transceivers[0].dtlsTransport);
--        }
--
--        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {
--          pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(pc.transceivers[0].dtlsTransport);
--        }
--      }
--
--      if (description.type === 'offer' && !rejected) {
--        transceiver = pc.transceivers[sdpMLineIndex] || pc._createTransceiver(kind);
--        transceiver.mid = mid;
--
--        if (!transceiver.iceGatherer) {
--          transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex, usingBundle);
--        }
--
--        if (cands.length && transceiver.iceTransport.state === 'new') {
--          if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {
--            transceiver.iceTransport.setRemoteCandidates(cands);
--          } else {
--            cands.forEach(function (candidate) {
--              maybeAddCandidate(transceiver.iceTransport, candidate);
--            });
--          }
--        }
--
--        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind); // filter RTX until additional stuff needed for RTX is implemented
--        // in adapter.js
--
--        if (edgeVersion < 15019) {
--          localCapabilities.codecs = localCapabilities.codecs.filter(function (codec) {
--            return codec.name !== 'rtx';
--          });
--        }
--
--        sendEncodingParameters = transceiver.sendEncodingParameters || [{
--          ssrc: (2 * sdpMLineIndex + 2) * 1001
--        }]; // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams
--
--        var isNewTrack = false;
--
--        if (direction === 'sendrecv' || direction === 'sendonly') {
--          isNewTrack = !transceiver.rtpReceiver;
--          rtpReceiver = transceiver.rtpReceiver || new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);
--
--          if (isNewTrack) {
--            var stream;
--            track = rtpReceiver.track; // FIXME: does not work with Plan B.
--
--            if (remoteMsid && remoteMsid.stream === '-') {// no-op. a stream id of '-' means: no associated stream.
--            } else if (remoteMsid) {
--              if (!streams[remoteMsid.stream]) {
--                streams[remoteMsid.stream] = new window.MediaStream();
--                Object.defineProperty(streams[remoteMsid.stream], 'id', {
--                  get: function () {
--                    return remoteMsid.stream;
--                  }
--                });
--              }
--
--              Object.defineProperty(track, 'id', {
--                get: function () {
--                  return remoteMsid.track;
--                }
--              });
--              stream = streams[remoteMsid.stream];
--            } else {
--              if (!streams.default) {
--                streams.default = new window.MediaStream();
--              }
--
--              stream = streams.default;
--            }
--
--            if (stream) {
--              addTrackToStreamAndFireEvent(track, stream);
--              transceiver.associatedRemoteMediaStreams.push(stream);
--            }
--
--            receiverList.push([track, rtpReceiver, stream]);
--          }
--        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {
--          transceiver.associatedRemoteMediaStreams.forEach(function (s) {
--            var nativeTrack = s.getTracks().find(function (t) {
--              return t.id === transceiver.rtpReceiver.track.id;
--            });
--
--            if (nativeTrack) {
--              removeTrackFromStreamAndFireEvent(nativeTrack, s);
--            }
--          });
--          transceiver.associatedRemoteMediaStreams = [];
--        }
--
--        transceiver.localCapabilities = localCapabilities;
--        transceiver.remoteCapabilities = remoteCapabilities;
--        transceiver.rtpReceiver = rtpReceiver;
--        transceiver.rtcpParameters = rtcpParameters;
--        transceiver.sendEncodingParameters = sendEncodingParameters;
--        transceiver.recvEncodingParameters = recvEncodingParameters; // Start the RTCRtpReceiver now. The RTPSender is started in
--        // setLocalDescription.
--
--        pc._transceive(pc.transceivers[sdpMLineIndex], false, isNewTrack);
--      } else if (description.type === 'answer' && !rejected) {
--        transceiver = pc.transceivers[sdpMLineIndex];
--        iceGatherer = transceiver.iceGatherer;
--        iceTransport = transceiver.iceTransport;
--        dtlsTransport = transceiver.dtlsTransport;
--        rtpReceiver = transceiver.rtpReceiver;
--        sendEncodingParameters = transceiver.sendEncodingParameters;
--        localCapabilities = transceiver.localCapabilities;
--        pc.transceivers[sdpMLineIndex].recvEncodingParameters = recvEncodingParameters;
--        pc.transceivers[sdpMLineIndex].remoteCapabilities = remoteCapabilities;
--        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;
--
--        if (cands.length && iceTransport.state === 'new') {
--          if ((isIceLite || isComplete) && (!usingBundle || sdpMLineIndex === 0)) {
--            iceTransport.setRemoteCandidates(cands);
--          } else {
--            cands.forEach(function (candidate) {
--              maybeAddCandidate(transceiver.iceTransport, candidate);
--            });
--          }
--        }
--
--        if (!usingBundle || sdpMLineIndex === 0) {
--          if (iceTransport.state === 'new') {
--            iceTransport.start(iceGatherer, remoteIceParameters, 'controlling');
--          }
--
--          if (dtlsTransport.state === 'new') {
--            dtlsTransport.start(remoteDtlsParameters);
--          }
--        } // If the offer contained RTX but the answer did not,
--        // remove RTX from sendEncodingParameters.
--
--
--        var commonCapabilities = getCommonCapabilities(transceiver.localCapabilities, transceiver.remoteCapabilities);
--        var hasRtx = commonCapabilities.codecs.filter(function (c) {
--          return c.name.toLowerCase() === 'rtx';
--        }).length;
--
--        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
--          delete transceiver.sendEncodingParameters[0].rtx;
--        }
--
--        pc._transceive(transceiver, direction === 'sendrecv' || direction === 'recvonly', direction === 'sendrecv' || direction === 'sendonly'); // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams
--
--
--        if (rtpReceiver && (direction === 'sendrecv' || direction === 'sendonly')) {
--          track = rtpReceiver.track;
--
--          if (remoteMsid) {
--            if (!streams[remoteMsid.stream]) {
--              streams[remoteMsid.stream] = new window.MediaStream();
--            }
--
--            addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);
--            receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);
--          } else {
--            if (!streams.default) {
--              streams.default = new window.MediaStream();
--            }
--
--            addTrackToStreamAndFireEvent(track, streams.default);
--            receiverList.push([track, rtpReceiver, streams.default]);
--          }
--        } else {
--          // FIXME: actually the receiver should be created later.
--          delete transceiver.rtpReceiver;
--        }
--      }
--    });
--
--    if (pc._dtlsRole === undefined) {
--      pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';
--    }
--
--    pc._remoteDescription = {
--      type: description.type,
--      sdp: description.sdp
--    };
--
--    if (description.type === 'offer') {
--      pc._updateSignalingState('have-remote-offer');
--    } else {
--      pc._updateSignalingState('stable');
--    }
--
--    Object.keys(streams).forEach(function (sid) {
--      var stream = streams[sid];
--
--      if (stream.getTracks().length) {
--        if (pc.remoteStreams.indexOf(stream) === -1) {
--          pc.remoteStreams.push(stream);
--          var event = new Event('addstream');
--          event.stream = stream;
--          window.setTimeout(function () {
--            pc._dispatchEvent('addstream', event);
--          });
--        }
--
--        receiverList.forEach(function (item) {
--          var track = item[0];
--          var receiver = item[1];
--
--          if (stream.id !== item[2].id) {
--            return;
--          }
--
--          fireAddTrack(pc, track, receiver, [stream]);
--        });
--      }
--    });
--    receiverList.forEach(function (item) {
--      if (item[2]) {
--        return;
--      }
--
--      fireAddTrack(pc, item[0], item[1], []);
--    }); // check whether addIceCandidate({}) was called within four seconds after
--    // setRemoteDescription.
--
--    window.setTimeout(function () {
--      if (!(pc && pc.transceivers)) {
--        return;
--      }
--
--      pc.transceivers.forEach(function (transceiver) {
--        if (transceiver.iceTransport && transceiver.iceTransport.state === 'new' && transceiver.iceTransport.getRemoteCandidates().length > 0) {
--          console.warn('Timeout for addRemoteCandidate. Consider sending ' + 'an end-of-candidates notification');
--          transceiver.iceTransport.addRemoteCandidate({});
--        }
--      });
--    }, 4000);
--    return Promise.resolve();
--  };
--
--  RTCPeerConnection.prototype.close = function () {
--    this.transceivers.forEach(function (transceiver) {
--      /* not yet
--      if (transceiver.iceGatherer) {
--        transceiver.iceGatherer.close();
--      }
--      */
--      if (transceiver.iceTransport) {
--        transceiver.iceTransport.stop();
--      }
--
--      if (transceiver.dtlsTransport) {
--        transceiver.dtlsTransport.stop();
--      }
--
--      if (transceiver.rtpSender) {
--        transceiver.rtpSender.stop();
--      }
--
--      if (transceiver.rtpReceiver) {
--        transceiver.rtpReceiver.stop();
--      }
--    }); // FIXME: clean up tracks, local streams, remote streams, etc
--
--    this._isClosed = true;
--
--    this._updateSignalingState('closed');
--  }; // Update the signaling state.
--
--
--  RTCPeerConnection.prototype._updateSignalingState = function (newState) {
--    this.signalingState = newState;
--    var event = new Event('signalingstatechange');
--
--    this._dispatchEvent('signalingstatechange', event);
--  }; // Determine whether to fire the negotiationneeded event.
--
--
--  RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function () {
--    var pc = this;
--
--    if (this.signalingState !== 'stable' || this.needNegotiation === true) {
--      return;
--    }
--
--    this.needNegotiation = true;
--    window.setTimeout(function () {
--      if (pc.needNegotiation) {
--        pc.needNegotiation = false;
--        var event = new Event('negotiationneeded');
--
--        pc._dispatchEvent('negotiationneeded', event);
--      }
--    }, 0);
--  }; // Update the ice connection state.
--
--
--  RTCPeerConnection.prototype._updateIceConnectionState = function () {
--    var newState;
--    var states = {
--      'new': 0,
--      closed: 0,
--      checking: 0,
--      connected: 0,
--      completed: 0,
--      disconnected: 0,
--      failed: 0
--    };
--    this.transceivers.forEach(function (transceiver) {
--      if (transceiver.iceTransport && !transceiver.rejected) {
--        states[transceiver.iceTransport.state]++;
--      }
--    });
--    newState = 'new';
--
--    if (states.failed > 0) {
--      newState = 'failed';
--    } else if (states.checking > 0) {
--      newState = 'checking';
--    } else if (states.disconnected > 0) {
--      newState = 'disconnected';
--    } else if (states.new > 0) {
--      newState = 'new';
--    } else if (states.connected > 0) {
--      newState = 'connected';
--    } else if (states.completed > 0) {
--      newState = 'completed';
--    }
--
--    if (newState !== this.iceConnectionState) {
--      this.iceConnectionState = newState;
--      var event = new Event('iceconnectionstatechange');
--
--      this._dispatchEvent('iceconnectionstatechange', event);
--    }
--  }; // Update the connection state.
--
--
--  RTCPeerConnection.prototype._updateConnectionState = function () {
--    var newState;
--    var states = {
--      'new': 0,
--      closed: 0,
--      connecting: 0,
--      connected: 0,
--      completed: 0,
--      disconnected: 0,
--      failed: 0
--    };
--    this.transceivers.forEach(function (transceiver) {
--      if (transceiver.iceTransport && transceiver.dtlsTransport && !transceiver.rejected) {
--        states[transceiver.iceTransport.state]++;
--        states[transceiver.dtlsTransport.state]++;
--      }
--    }); // ICETransport.completed and connected are the same for this purpose.
--
--    states.connected += states.completed;
--    newState = 'new';
--
--    if (states.failed > 0) {
--      newState = 'failed';
--    } else if (states.connecting > 0) {
--      newState = 'connecting';
--    } else if (states.disconnected > 0) {
--      newState = 'disconnected';
--    } else if (states.new > 0) {
--      newState = 'new';
--    } else if (states.connected > 0) {
--      newState = 'connected';
--    }
--
--    if (newState !== this.connectionState) {
--      this.connectionState = newState;
--      var event = new Event('connectionstatechange');
--
--      this._dispatchEvent('connectionstatechange', event);
--    }
--  };
--
--  RTCPeerConnection.prototype.createOffer = function () {
--    var pc = this;
--
--    if (pc._isClosed) {
--      return Promise.reject(makeError('InvalidStateError', 'Can not call createOffer after close'));
--    }
--
--    var numAudioTracks = pc.transceivers.filter(function (t) {
--      return t.kind === 'audio';
--    }).length;
--    var numVideoTracks = pc.transceivers.filter(function (t) {
--      return t.kind === 'video';
--    }).length; // Determine number of audio and video tracks we need to send/recv.
--
--    var offerOptions = arguments[0];
--
--    if (offerOptions) {
--      // Reject Chrome legacy constraints.
--      if (offerOptions.mandatory || offerOptions.optional) {
--        throw new TypeError('Legacy mandatory/optional constraints not supported.');
--      }
--
--      if (offerOptions.offerToReceiveAudio !== undefined) {
--        if (offerOptions.offerToReceiveAudio === true) {
--          numAudioTracks = 1;
--        } else if (offerOptions.offerToReceiveAudio === false) {
--          numAudioTracks = 0;
--        } else {
--          numAudioTracks = offerOptions.offerToReceiveAudio;
--        }
--      }
--
--      if (offerOptions.offerToReceiveVideo !== undefined) {
--        if (offerOptions.offerToReceiveVideo === true) {
--          numVideoTracks = 1;
--        } else if (offerOptions.offerToReceiveVideo === false) {
--          numVideoTracks = 0;
--        } else {
--          numVideoTracks = offerOptions.offerToReceiveVideo;
--        }
--      }
--    }
--
--    pc.transceivers.forEach(function (transceiver) {
--      if (transceiver.kind === 'audio') {
--        numAudioTracks--;
--
--        if (numAudioTracks < 0) {
--          transceiver.wantReceive = false;
--        }
--      } else if (transceiver.kind === 'video') {
--        numVideoTracks--;
--
--        if (numVideoTracks < 0) {
--          transceiver.wantReceive = false;
--        }
--      }
--    }); // Create M-lines for recvonly streams.
--
--    while (numAudioTracks > 0 || numVideoTracks > 0) {
--      if (numAudioTracks > 0) {
--        pc._createTransceiver('audio');
--
--        numAudioTracks--;
--      }
--
--      if (numVideoTracks > 0) {
--        pc._createTransceiver('video');
--
--        numVideoTracks--;
--      }
--    }
--
--    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId, pc._sdpSessionVersion++);
--    pc.transceivers.forEach(function (transceiver, sdpMLineIndex) {
--      // For each track, create an ice gatherer, ice transport,
--      // dtls transport, potentially rtpsender and rtpreceiver.
--      var track = transceiver.track;
--      var kind = transceiver.kind;
--      var mid = transceiver.mid || SDPUtils.generateIdentifier();
--      transceiver.mid = mid;
--
--      if (!transceiver.iceGatherer) {
--        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex, pc.usingBundle);
--      }
--
--      var localCapabilities = window.RTCRtpSender.getCapabilities(kind); // filter RTX until additional stuff needed for RTX is implemented
--      // in adapter.js
--
--      if (edgeVersion < 15019) {
--        localCapabilities.codecs = localCapabilities.codecs.filter(function (codec) {
--          return codec.name !== 'rtx';
--        });
--      }
--
--      localCapabilities.codecs.forEach(function (codec) {
--        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552
--        // by adding level-asymmetry-allowed=1
--        if (codec.name === 'H264' && codec.parameters['level-asymmetry-allowed'] === undefined) {
--          codec.parameters['level-asymmetry-allowed'] = '1';
--        } // for subsequent offers, we might have to re-use the payload
--        // type of the last offer.
--
--
--        if (transceiver.remoteCapabilities && transceiver.remoteCapabilities.codecs) {
--          transceiver.remoteCapabilities.codecs.forEach(function (remoteCodec) {
--            if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() && codec.clockRate === remoteCodec.clockRate) {
--              codec.preferredPayloadType = remoteCodec.payloadType;
--            }
--          });
--        }
--      });
--      localCapabilities.headerExtensions.forEach(function (hdrExt) {
--        var remoteExtensions = transceiver.remoteCapabilities && transceiver.remoteCapabilities.headerExtensions || [];
--        remoteExtensions.forEach(function (rHdrExt) {
--          if (hdrExt.uri === rHdrExt.uri) {
--            hdrExt.id = rHdrExt.id;
--          }
--        });
--      }); // generate an ssrc now, to be used later in rtpSender.send
--
--      var sendEncodingParameters = transceiver.sendEncodingParameters || [{
--        ssrc: (2 * sdpMLineIndex + 1) * 1001
--      }];
--
--      if (track) {
--        // add RTX
--        if (edgeVersion >= 15019 && kind === 'video' && !sendEncodingParameters[0].rtx) {
--          sendEncodingParameters[0].rtx = {
--            ssrc: sendEncodingParameters[0].ssrc + 1
--          };
--        }
--      }
--
--      if (transceiver.wantReceive) {
--        transceiver.rtpReceiver = new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);
--      }
--
--      transceiver.localCapabilities = localCapabilities;
--      transceiver.sendEncodingParameters = sendEncodingParameters;
--    }); // always offer BUNDLE and dispose on return if not supported.
--
--    if (pc._config.bundlePolicy !== 'max-compat') {
--      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function (t) {
--        return t.mid;
--      }).join(' ') + '\r\n';
--    }
--
--    sdp += 'a=ice-options:trickle\r\n';
--    pc.transceivers.forEach(function (transceiver, sdpMLineIndex) {
--      sdp += writeMediaSection(transceiver, transceiver.localCapabilities, 'offer', transceiver.stream, pc._dtlsRole);
--      sdp += 'a=rtcp-rsize\r\n';
--
--      if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' && (sdpMLineIndex === 0 || !pc.usingBundle)) {
--        transceiver.iceGatherer.getLocalCandidates().forEach(function (cand) {
--          cand.component = 1;
--          sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\r\n';
--        });
--
--        if (transceiver.iceGatherer.state === 'completed') {
--          sdp += 'a=end-of-candidates\r\n';
--        }
--      }
--    });
--    var desc = new window.RTCSessionDescription({
--      type: 'offer',
--      sdp: sdp
--    });
--    return Promise.resolve(desc);
--  };
--
--  RTCPeerConnection.prototype.createAnswer = function () {
--    var pc = this;
--
--    if (pc._isClosed) {
--      return Promise.reject(makeError('InvalidStateError', 'Can not call createAnswer after close'));
--    }
--
--    if (!(pc.signalingState === 'have-remote-offer' || pc.signalingState === 'have-local-pranswer')) {
--      return Promise.reject(makeError('InvalidStateError', 'Can not call createAnswer in signalingState ' + pc.signalingState));
--    }
--
--    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId, pc._sdpSessionVersion++);
--
--    if (pc.usingBundle) {
--      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function (t) {
--        return t.mid;
--      }).join(' ') + '\r\n';
--    }
--
--    sdp += 'a=ice-options:trickle\r\n';
--    var mediaSectionsInOffer = SDPUtils.getMediaSections(pc._remoteDescription.sdp).length;
--    pc.transceivers.forEach(function (transceiver, sdpMLineIndex) {
--      if (sdpMLineIndex + 1 > mediaSectionsInOffer) {
--        return;
--      }
--
--      if (transceiver.rejected) {
--        if (transceiver.kind === 'application') {
--          if (transceiver.protocol === 'DTLS/SCTP') {
--            // legacy fmt
--            sdp += 'm=application 0 DTLS/SCTP 5000\r\n';
--          } else {
--            sdp += 'm=application 0 ' + transceiver.protocol + ' webrtc-datachannel\r\n';
--          }
--        } else if (transceiver.kind === 'audio') {
--          sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\r\n' + 'a=rtpmap:0 PCMU/8000\r\n';
--        } else if (transceiver.kind === 'video') {
--          sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\r\n' + 'a=rtpmap:120 VP8/90000\r\n';
--        }
--
--        sdp += 'c=IN IP4 0.0.0.0\r\n' + 'a=inactive\r\n' + 'a=mid:' + transceiver.mid + '\r\n';
--        return;
--      } // FIXME: look at direction.
--
--
--      if (transceiver.stream) {
--        var localTrack;
--
--        if (transceiver.kind === 'audio') {
--          localTrack = transceiver.stream.getAudioTracks()[0];
--        } else if (transceiver.kind === 'video') {
--          localTrack = transceiver.stream.getVideoTracks()[0];
--        }
--
--        if (localTrack) {
--          // add RTX
--          if (edgeVersion >= 15019 && transceiver.kind === 'video' && !transceiver.sendEncodingParameters[0].rtx) {
--            transceiver.sendEncodingParameters[0].rtx = {
--              ssrc: transceiver.sendEncodingParameters[0].ssrc + 1
--            };
--          }
--        }
--      } // Calculate intersection of capabilities.
--
--
--      var commonCapabilities = getCommonCapabilities(transceiver.localCapabilities, transceiver.remoteCapabilities);
--      var hasRtx = commonCapabilities.codecs.filter(function (c) {
--        return c.name.toLowerCase() === 'rtx';
--      }).length;
--
--      if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
--        delete transceiver.sendEncodingParameters[0].rtx;
--      }
--
--      sdp += writeMediaSection(transceiver, commonCapabilities, 'answer', transceiver.stream, pc._dtlsRole);
--
--      if (transceiver.rtcpParameters && transceiver.rtcpParameters.reducedSize) {
--        sdp += 'a=rtcp-rsize\r\n';
--      }
--    });
--    var desc = new window.RTCSessionDescription({
--      type: 'answer',
--      sdp: sdp
--    });
--    return Promise.resolve(desc);
--  };
--
--  RTCPeerConnection.prototype.addIceCandidate = function (candidate) {
--    var pc = this;
--    var sections;
--
--    if (candidate && !(candidate.sdpMLineIndex !== undefined || candidate.sdpMid)) {
--      return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));
--    } // TODO: needs to go into ops queue.
--
--
--    return new Promise(function (resolve, reject) {
--      if (!pc._remoteDescription) {
--        return reject(makeError('InvalidStateError', 'Can not add ICE candidate without a remote description'));
--      } else if (!candidate || candidate.candidate === '') {
--        for (var j = 0; j < pc.transceivers.length; j++) {
--          if (pc.transceivers[j].rejected) {
--            continue;
--          }
--
--          pc.transceivers[j].iceTransport.addRemoteCandidate({});
--          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);
--          sections[j] += 'a=end-of-candidates\r\n';
--          pc._remoteDescription.sdp = SDPUtils.getDescription(pc._remoteDescription.sdp) + sections.join('');
--
--          if (pc.usingBundle) {
--            break;
--          }
--        }
--      } else {
--        var sdpMLineIndex = candidate.sdpMLineIndex;
--
--        if (candidate.sdpMid) {
--          for (var i = 0; i < pc.transceivers.length; i++) {
--            if (pc.transceivers[i].mid === candidate.sdpMid) {
--              sdpMLineIndex = i;
--              break;
--            }
--          }
--        }
--
--        var transceiver = pc.transceivers[sdpMLineIndex];
--
--        if (transceiver) {
--          if (transceiver.rejected) {
--            return resolve();
--          }
--
--          var cand = Object.keys(candidate.candidate).length > 0 ? SDPUtils.parseCandidate(candidate.candidate) : {}; // Ignore Chrome's invalid candidates since Edge does not like them.
--
--          if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {
--            return resolve();
--          } // Ignore RTCP candidates, we assume RTCP-MUX.
--
--
--          if (cand.component && cand.component !== 1) {
--            return resolve();
--          } // when using bundle, avoid adding candidates to the wrong
--          // ice transport. And avoid adding candidates added in the SDP.
--
--
--          if (sdpMLineIndex === 0 || sdpMLineIndex > 0 && transceiver.iceTransport !== pc.transceivers[0].iceTransport) {
--            if (!maybeAddCandidate(transceiver.iceTransport, cand)) {
--              return reject(makeError('OperationError', 'Can not add ICE candidate'));
--            }
--          } // update the remoteDescription.
--
--
--          var candidateString = candidate.candidate.trim();
--
--          if (candidateString.indexOf('a=') === 0) {
--            candidateString = candidateString.substr(2);
--          }
--
--          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);
--          sections[sdpMLineIndex] += 'a=' + (cand.type ? candidateString : 'end-of-candidates') + '\r\n';
--          pc._remoteDescription.sdp = SDPUtils.getDescription(pc._remoteDescription.sdp) + sections.join('');
--        } else {
--          return reject(makeError('OperationError', 'Can not add ICE candidate'));
--        }
--      }
--
--      resolve();
--    });
--  };
--
--  RTCPeerConnection.prototype.getStats = function (selector) {
--    if (selector && selector instanceof window.MediaStreamTrack) {
--      var senderOrReceiver = null;
--      this.transceivers.forEach(function (transceiver) {
--        if (transceiver.rtpSender && transceiver.rtpSender.track === selector) {
--          senderOrReceiver = transceiver.rtpSender;
--        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track === selector) {
--          senderOrReceiver = transceiver.rtpReceiver;
--        }
--      });
--
--      if (!senderOrReceiver) {
--        throw makeError('InvalidAccessError', 'Invalid selector.');
--      }
--
--      return senderOrReceiver.getStats();
--    }
--
--    var promises = [];
--    this.transceivers.forEach(function (transceiver) {
--      ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport', 'dtlsTransport'].forEach(function (method) {
--        if (transceiver[method]) {
--          promises.push(transceiver[method].getStats());
--        }
--      });
--    });
--    return Promise.all(promises).then(function (allStats) {
--      var results = new Map();
--      allStats.forEach(function (stats) {
--        stats.forEach(function (stat) {
--          results.set(stat.id, stat);
--        });
--      });
--      return results;
--    });
--  }; // fix low-level stat names and return Map instead of object.
--
--
--  var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer', 'RTCIceTransport', 'RTCDtlsTransport'];
--  ortcObjects.forEach(function (ortcObjectName) {
--    var obj = window[ortcObjectName];
--
--    if (obj && obj.prototype && obj.prototype.getStats) {
--      var nativeGetstats = obj.prototype.getStats;
--
--      obj.prototype.getStats = function () {
--        return nativeGetstats.apply(this).then(function (nativeStats) {
--          var mapStats = new Map();
--          Object.keys(nativeStats).forEach(function (id) {
--            nativeStats[id].type = fixStatsType(nativeStats[id]);
--            mapStats.set(id, nativeStats[id]);
--          });
--          return mapStats;
--        });
--      };
--    }
--  }); // legacy callback shims. Should be moved to adapter.js some days.
--
--  var methods = ['createOffer', 'createAnswer'];
--  methods.forEach(function (method) {
--    var nativeMethod = RTCPeerConnection.prototype[method];
--
--    RTCPeerConnection.prototype[method] = function () {
--      var args = arguments;
--
--      if (typeof args[0] === 'function' || typeof args[1] === 'function') {
--        // legacy
--        return nativeMethod.apply(this, [arguments[2]]).then(function (description) {
--          if (typeof args[0] === 'function') {
--            args[0].apply(null, [description]);
--          }
--        }, function (error) {
--          if (typeof args[1] === 'function') {
--            args[1].apply(null, [error]);
--          }
--        });
--      }
--
--      return nativeMethod.apply(this, arguments);
--    };
--  });
--  methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];
--  methods.forEach(function (method) {
--    var nativeMethod = RTCPeerConnection.prototype[method];
--
--    RTCPeerConnection.prototype[method] = function () {
--      var args = arguments;
--
--      if (typeof args[1] === 'function' || typeof args[2] === 'function') {
--        // legacy
--        return nativeMethod.apply(this, arguments).then(function () {
--          if (typeof args[1] === 'function') {
--            args[1].apply(null);
--          }
--        }, function (error) {
--          if (typeof args[2] === 'function') {
--            args[2].apply(null, [error]);
--          }
--        });
--      }
--
--      return nativeMethod.apply(this, arguments);
--    };
--  }); // getStats is special. It doesn't have a spec legacy method yet we support
--  // getStats(something, cb) without error callbacks.
--
--  ['getStats'].forEach(function (method) {
--    var nativeMethod = RTCPeerConnection.prototype[method];
--
--    RTCPeerConnection.prototype[method] = function () {
--      var args = arguments;
--
--      if (typeof args[1] === 'function') {
--        return nativeMethod.apply(this, arguments).then(function () {
--          if (typeof args[1] === 'function') {
--            args[1].apply(null);
--          }
--        });
--      }
--
--      return nativeMethod.apply(this, arguments);
--    };
--  });
--  return RTCPeerConnection;
--};
--},{"sdp":"YHvh"}],"YdKx":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimGetUserMedia = shimGetUserMedia;
--
--function shimGetUserMedia(window) {
--  var navigator = window && window.navigator;
--
--  var shimError_ = function (e) {
--    return {
--      name: {
--        PermissionDeniedError: 'NotAllowedError'
--      }[e.name] || e.name,
--      message: e.message,
--      constraint: e.constraint,
--      toString: function () {
--        return this.name;
--      }
--    };
--  }; // getUserMedia error shim.
--
--
--  var origGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
--
--  navigator.mediaDevices.getUserMedia = function (c) {
--    return origGetUserMedia(c).catch(function (e) {
--      return Promise.reject(shimError_(e));
--    });
--  };
--}
--},{}],"P3bV":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimGetDisplayMedia = shimGetDisplayMedia;
--
--function shimGetDisplayMedia(window) {
--  if (!('getDisplayMedia' in window.navigator)) {
--    return;
--  }
--
--  if (!window.navigator.mediaDevices) {
--    return;
--  }
--
--  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
--    return;
--  }
--
--  window.navigator.mediaDevices.getDisplayMedia = window.navigator.getDisplayMedia.bind(window.navigator);
--}
--},{}],"XRic":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimPeerConnection = shimPeerConnection;
--exports.shimReplaceTrack = shimReplaceTrack;
--Object.defineProperty(exports, "shimGetUserMedia", {
--  enumerable: true,
--  get: function () {
--    return _getusermedia.shimGetUserMedia;
--  }
--});
--Object.defineProperty(exports, "shimGetDisplayMedia", {
--  enumerable: true,
--  get: function () {
--    return _getdisplaymedia.shimGetDisplayMedia;
--  }
--});
--
--var utils = _interopRequireWildcard(require("../utils"));
--
--var _filtericeservers = require("./filtericeservers");
--
--var _rtcpeerconnectionShim = _interopRequireDefault(require("rtcpeerconnection-shim"));
--
--var _getusermedia = require("./getusermedia");
--
--var _getdisplaymedia = require("./getdisplaymedia");
--
--function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
--
--function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
--
--function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
--
--function shimPeerConnection(window, browserDetails) {
--  if (window.RTCIceGatherer) {
--    if (!window.RTCIceCandidate) {
--      window.RTCIceCandidate = function RTCIceCandidate(args) {
--        return args;
--      };
--    }
--
--    if (!window.RTCSessionDescription) {
--      window.RTCSessionDescription = function RTCSessionDescription(args) {
--        return args;
--      };
--    } // this adds an additional event listener to MediaStrackTrack that signals
--    // when a tracks enabled property was changed. Workaround for a bug in
--    // addStream, see below. No longer required in 15025+
--
--
--    if (browserDetails.version < 15025) {
--      var origMSTEnabled = Object.getOwnPropertyDescriptor(window.MediaStreamTrack.prototype, 'enabled');
--      Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {
--        set: function (value) {
--          origMSTEnabled.set.call(this, value);
--          var ev = new Event('enabled');
--          ev.enabled = value;
--          this.dispatchEvent(ev);
--        }
--      });
--    }
--  } // ORTC defines the DTMF sender a bit different.
--  // https://github.com/w3c/ortc/issues/714
--
--
--  if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {
--    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {
--      get: function () {
--        if (this._dtmf === undefined) {
--          if (this.track.kind === 'audio') {
--            this._dtmf = new window.RTCDtmfSender(this);
--          } else if (this.track.kind === 'video') {
--            this._dtmf = null;
--          }
--        }
--
--        return this._dtmf;
--      }
--    });
--  } // Edge currently only implements the RTCDtmfSender, not the
--  // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*
--
--
--  if (window.RTCDtmfSender && !window.RTCDTMFSender) {
--    window.RTCDTMFSender = window.RTCDtmfSender;
--  }
--
--  var RTCPeerConnectionShim = (0, _rtcpeerconnectionShim.default)(window, browserDetails.version);
--
--  window.RTCPeerConnection = function RTCPeerConnection(config) {
--    if (config && config.iceServers) {
--      config.iceServers = (0, _filtericeservers.filterIceServers)(config.iceServers, browserDetails.version);
--      utils.log('ICE servers after filtering:', config.iceServers);
--    }
--
--    return new RTCPeerConnectionShim(config);
--  };
--
--  window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;
--}
--
--function shimReplaceTrack(window) {
--  // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614
--  if (window.RTCRtpSender && !('replaceTrack' in window.RTCRtpSender.prototype)) {
--    window.RTCRtpSender.prototype.replaceTrack = window.RTCRtpSender.prototype.setTrack;
--  }
--}
--},{"../utils":"iSxC","./filtericeservers":"NZ1C","rtcpeerconnection-shim":"NJ2u","./getusermedia":"YdKx","./getdisplaymedia":"P3bV"}],"GzSv":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimGetUserMedia = shimGetUserMedia;
--
--var utils = _interopRequireWildcard(require("../utils"));
--
--function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
--
--function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
--
--function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
--
--function shimGetUserMedia(window, browserDetails) {
--  var navigator = window && window.navigator;
--  var MediaStreamTrack = window && window.MediaStreamTrack;
--
--  navigator.getUserMedia = function (constraints, onSuccess, onError) {
--    // Replace Firefox 44+'s deprecation warning with unprefixed version.
--    utils.deprecated('navigator.getUserMedia', 'navigator.mediaDevices.getUserMedia');
--    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);
--  };
--
--  if (!(browserDetails.version > 55 && 'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {
--    var remap = function (obj, a, b) {
--      if (a in obj && !(b in obj)) {
--        obj[b] = obj[a];
--        delete obj[a];
--      }
--    };
--
--    var nativeGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
--
--    navigator.mediaDevices.getUserMedia = function (c) {
--      if (_typeof(c) === 'object' && _typeof(c.audio) === 'object') {
--        c = JSON.parse(JSON.stringify(c));
--        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');
--        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');
--      }
--
--      return nativeGetUserMedia(c);
--    };
--
--    if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {
--      var nativeGetSettings = MediaStreamTrack.prototype.getSettings;
--
--      MediaStreamTrack.prototype.getSettings = function () {
--        var obj = nativeGetSettings.apply(this, arguments);
--        remap(obj, 'mozAutoGainControl', 'autoGainControl');
--        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');
--        return obj;
--      };
--    }
--
--    if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {
--      var nativeApplyConstraints = MediaStreamTrack.prototype.applyConstraints;
--
--      MediaStreamTrack.prototype.applyConstraints = function (c) {
--        if (this.kind === 'audio' && _typeof(c) === 'object') {
--          c = JSON.parse(JSON.stringify(c));
--          remap(c, 'autoGainControl', 'mozAutoGainControl');
--          remap(c, 'noiseSuppression', 'mozNoiseSuppression');
--        }
--
--        return nativeApplyConstraints.apply(this, [c]);
--      };
--    }
--  }
--}
--},{"../utils":"iSxC"}],"UuGU":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimGetDisplayMedia = shimGetDisplayMedia;
--
--function shimGetDisplayMedia(window, preferredMediaSource) {
--  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
--    return;
--  }
--
--  if (!window.navigator.mediaDevices) {
--    return;
--  }
--
--  window.navigator.mediaDevices.getDisplayMedia = function getDisplayMedia(constraints) {
--    if (!(constraints && constraints.video)) {
--      var err = new DOMException('getDisplayMedia without video ' + 'constraints is undefined');
--      err.name = 'NotFoundError'; // from https://heycam.github.io/webidl/#idl-DOMException-error-names
--
--      err.code = 8;
--      return Promise.reject(err);
--    }
--
--    if (constraints.video === true) {
--      constraints.video = {
--        mediaSource: preferredMediaSource
--      };
--    } else {
--      constraints.video.mediaSource = preferredMediaSource;
--    }
--
--    return window.navigator.mediaDevices.getUserMedia(constraints);
--  };
--}
--},{}],"Fzdr":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimOnTrack = shimOnTrack;
--exports.shimPeerConnection = shimPeerConnection;
--exports.shimSenderGetStats = shimSenderGetStats;
--exports.shimReceiverGetStats = shimReceiverGetStats;
--exports.shimRemoveStream = shimRemoveStream;
--exports.shimRTCDataChannel = shimRTCDataChannel;
--exports.shimAddTransceiver = shimAddTransceiver;
--exports.shimGetParameters = shimGetParameters;
--exports.shimCreateOffer = shimCreateOffer;
--exports.shimCreateAnswer = shimCreateAnswer;
--Object.defineProperty(exports, "shimGetUserMedia", {
--  enumerable: true,
--  get: function () {
--    return _getusermedia.shimGetUserMedia;
--  }
--});
--Object.defineProperty(exports, "shimGetDisplayMedia", {
--  enumerable: true,
--  get: function () {
--    return _getdisplaymedia.shimGetDisplayMedia;
--  }
--});
--
--var utils = _interopRequireWildcard(require("../utils"));
--
--var _getusermedia = require("./getusermedia");
--
--var _getdisplaymedia = require("./getdisplaymedia");
--
--function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
--
--function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
--
--function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
--
--function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
--
--function shimOnTrack(window) {
--  if (_typeof(window) === 'object' && window.RTCTrackEvent && 'receiver' in window.RTCTrackEvent.prototype && !('transceiver' in window.RTCTrackEvent.prototype)) {
--    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
--      get: function () {
--        return {
--          receiver: this.receiver
--        };
--      }
--    });
--  }
--}
--
--function shimPeerConnection(window, browserDetails) {
--  if (_typeof(window) !== 'object' || !(window.RTCPeerConnection || window.mozRTCPeerConnection)) {
--    return; // probably media.peerconnection.enabled=false in about:config
--  }
--
--  if (!window.RTCPeerConnection && window.mozRTCPeerConnection) {
--    // very basic support for old versions.
--    window.RTCPeerConnection = window.mozRTCPeerConnection;
--  }
--
--  if (browserDetails.version < 53) {
--    // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.
--    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {
--      var nativeMethod = window.RTCPeerConnection.prototype[method];
--
--      var methodObj = _defineProperty({}, method, function () {
--        arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);
--        return nativeMethod.apply(this, arguments);
--      });
--
--      window.RTCPeerConnection.prototype[method] = methodObj[method];
--    });
--  }
--
--  var modernStatsTypes = {
--    inboundrtp: 'inbound-rtp',
--    outboundrtp: 'outbound-rtp',
--    candidatepair: 'candidate-pair',
--    localcandidate: 'local-candidate',
--    remotecandidate: 'remote-candidate'
--  };
--  var nativeGetStats = window.RTCPeerConnection.prototype.getStats;
--
--  window.RTCPeerConnection.prototype.getStats = function getStats() {
--    var [selector, onSucc, onErr] = arguments;
--    return nativeGetStats.apply(this, [selector || null]).then(function (stats) {
--      if (browserDetails.version < 53 && !onSucc) {
--        // Shim only promise getStats with spec-hyphens in type names
--        // Leave callback version alone; misc old uses of forEach before Map
--        try {
--          stats.forEach(function (stat) {
--            stat.type = modernStatsTypes[stat.type] || stat.type;
--          });
--        } catch (e) {
--          if (e.name !== 'TypeError') {
--            throw e;
--          } // Avoid TypeError: "type" is read-only, in old versions. 34-43ish
--
--
--          stats.forEach(function (stat, i) {
--            stats.set(i, Object.assign({}, stat, {
--              type: modernStatsTypes[stat.type] || stat.type
--            }));
--          });
--        }
--      }
--
--      return stats;
--    }).then(onSucc, onErr);
--  };
--}
--
--function shimSenderGetStats(window) {
--  if (!(_typeof(window) === 'object' && window.RTCPeerConnection && window.RTCRtpSender)) {
--    return;
--  }
--
--  if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {
--    return;
--  }
--
--  var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
--
--  if (origGetSenders) {
--    window.RTCPeerConnection.prototype.getSenders = function getSenders() {
--      var _this = this;
--
--      var senders = origGetSenders.apply(this, []);
--      senders.forEach(function (sender) {
--        return sender._pc = _this;
--      });
--      return senders;
--    };
--  }
--
--  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
--
--  if (origAddTrack) {
--    window.RTCPeerConnection.prototype.addTrack = function addTrack() {
--      var sender = origAddTrack.apply(this, arguments);
--      sender._pc = this;
--      return sender;
--    };
--  }
--
--  window.RTCRtpSender.prototype.getStats = function getStats() {
--    return this.track ? this._pc.getStats(this.track) : Promise.resolve(new Map());
--  };
--}
--
--function shimReceiverGetStats(window) {
--  if (!(_typeof(window) === 'object' && window.RTCPeerConnection && window.RTCRtpSender)) {
--    return;
--  }
--
--  if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {
--    return;
--  }
--
--  var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;
--
--  if (origGetReceivers) {
--    window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {
--      var _this2 = this;
--
--      var receivers = origGetReceivers.apply(this, []);
--      receivers.forEach(function (receiver) {
--        return receiver._pc = _this2;
--      });
--      return receivers;
--    };
--  }
--
--  utils.wrapPeerConnectionEvent(window, 'track', function (e) {
--    e.receiver._pc = e.srcElement;
--    return e;
--  });
--
--  window.RTCRtpReceiver.prototype.getStats = function getStats() {
--    return this._pc.getStats(this.track);
--  };
--}
--
--function shimRemoveStream(window) {
--  if (!window.RTCPeerConnection || 'removeStream' in window.RTCPeerConnection.prototype) {
--    return;
--  }
--
--  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
--    var _this3 = this;
--
--    utils.deprecated('removeStream', 'removeTrack');
--    this.getSenders().forEach(function (sender) {
--      if (sender.track && stream.getTracks().includes(sender.track)) {
--        _this3.removeTrack(sender);
--      }
--    });
--  };
--}
--
--function shimRTCDataChannel(window) {
--  // rename DataChannel to RTCDataChannel (native fix in FF60):
--  // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851
--  if (window.DataChannel && !window.RTCDataChannel) {
--    window.RTCDataChannel = window.DataChannel;
--  }
--}
--
--function shimAddTransceiver(window) {
--  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
--  // Firefox ignores the init sendEncodings options passed to addTransceiver
--  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
--  if (!(_typeof(window) === 'object' && window.RTCPeerConnection)) {
--    return;
--  }
--
--  var origAddTransceiver = window.RTCPeerConnection.prototype.addTransceiver;
--
--  if (origAddTransceiver) {
--    window.RTCPeerConnection.prototype.addTransceiver = function addTransceiver() {
--      this.setParametersPromises = [];
--      var initParameters = arguments[1];
--      var shouldPerformCheck = initParameters && 'sendEncodings' in initParameters;
--
--      if (shouldPerformCheck) {
--        // If sendEncodings params are provided, validate grammar
--        initParameters.sendEncodings.forEach(function (encodingParam) {
--          if ('rid' in encodingParam) {
--            var ridRegex = /^[a-z0-9]{0,16}$/i;
--
--            if (!ridRegex.test(encodingParam.rid)) {
--              throw new TypeError('Invalid RID value provided.');
--            }
--          }
--
--          if ('scaleResolutionDownBy' in encodingParam) {
--            if (!(parseFloat(encodingParam.scaleResolutionDownBy) >= 1.0)) {
--              throw new RangeError('scale_resolution_down_by must be >= 1.0');
--            }
--          }
--
--          if ('maxFramerate' in encodingParam) {
--            if (!(parseFloat(encodingParam.maxFramerate) >= 0)) {
--              throw new RangeError('max_framerate must be >= 0.0');
--            }
--          }
--        });
--      }
--
--      var transceiver = origAddTransceiver.apply(this, arguments);
--
--      if (shouldPerformCheck) {
--        // Check if the init options were applied. If not we do this in an
--        // asynchronous way and save the promise reference in a global object.
--        // This is an ugly hack, but at the same time is way more robust than
--        // checking the sender parameters before and after the createOffer
--        // Also note that after the createoffer we are not 100% sure that
--        // the params were asynchronously applied so we might miss the
--        // opportunity to recreate offer.
--        var {
--          sender: sender
--        } = transceiver;
--        var params = sender.getParameters();
--
--        if (!('encodings' in params) || // Avoid being fooled by patched getParameters() below.
--        params.encodings.length === 1 && Object.keys(params.encodings[0]).length === 0) {
--          params.encodings = initParameters.sendEncodings;
--          sender.sendEncodings = initParameters.sendEncodings;
--          this.setParametersPromises.push(sender.setParameters(params).then(function () {
--            delete sender.sendEncodings;
--          }).catch(function () {
--            delete sender.sendEncodings;
--          }));
--        }
--      }
--
--      return transceiver;
--    };
--  }
--}
--
--function shimGetParameters(window) {
--  if (!(_typeof(window) === 'object' && window.RTCRtpSender)) {
--    return;
--  }
--
--  var origGetParameters = window.RTCRtpSender.prototype.getParameters;
--
--  if (origGetParameters) {
--    window.RTCRtpSender.prototype.getParameters = function getParameters() {
--      var params = origGetParameters.apply(this, arguments);
--
--      if (!('encodings' in params)) {
--        params.encodings = [].concat(this.sendEncodings || [{}]);
--      }
--
--      return params;
--    };
--  }
--}
--
--function shimCreateOffer(window) {
--  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
--  // Firefox ignores the init sendEncodings options passed to addTransceiver
--  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
--  if (!(_typeof(window) === 'object' && window.RTCPeerConnection)) {
--    return;
--  }
--
--  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;
--
--  window.RTCPeerConnection.prototype.createOffer = function createOffer() {
--    var _arguments = arguments,
--        _this4 = this;
--
--    if (this.setParametersPromises && this.setParametersPromises.length) {
--      return Promise.all(this.setParametersPromises).then(function () {
--        return origCreateOffer.apply(_this4, _arguments);
--      }).finally(function () {
--        _this4.setParametersPromises = [];
--      });
--    }
--
--    return origCreateOffer.apply(this, arguments);
--  };
--}
--
--function shimCreateAnswer(window) {
--  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
--  // Firefox ignores the init sendEncodings options passed to addTransceiver
--  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
--  if (!(_typeof(window) === 'object' && window.RTCPeerConnection)) {
--    return;
--  }
--
--  var origCreateAnswer = window.RTCPeerConnection.prototype.createAnswer;
--
--  window.RTCPeerConnection.prototype.createAnswer = function createAnswer() {
--    var _arguments2 = arguments,
--        _this5 = this;
--
--    if (this.setParametersPromises && this.setParametersPromises.length) {
--      return Promise.all(this.setParametersPromises).then(function () {
--        return origCreateAnswer.apply(_this5, _arguments2);
--      }).finally(function () {
--        _this5.setParametersPromises = [];
--      });
--    }
--
--    return origCreateAnswer.apply(this, arguments);
--  };
--}
--},{"../utils":"iSxC","./getusermedia":"GzSv","./getdisplaymedia":"UuGU"}],"t1lL":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimLocalStreamsAPI = shimLocalStreamsAPI;
--exports.shimRemoteStreamsAPI = shimRemoteStreamsAPI;
--exports.shimCallbacksAPI = shimCallbacksAPI;
--exports.shimGetUserMedia = shimGetUserMedia;
--exports.shimConstraints = shimConstraints;
--exports.shimRTCIceServerUrls = shimRTCIceServerUrls;
--exports.shimTrackEventTransceiver = shimTrackEventTransceiver;
--exports.shimCreateOfferLegacy = shimCreateOfferLegacy;
--exports.shimAudioContext = shimAudioContext;
--
--var utils = _interopRequireWildcard(require("../utils"));
--
--function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
--
--function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
--
--function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
--
--function shimLocalStreamsAPI(window) {
--  if (_typeof(window) !== 'object' || !window.RTCPeerConnection) {
--    return;
--  }
--
--  if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {
--    window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
--      if (!this._localStreams) {
--        this._localStreams = [];
--      }
--
--      return this._localStreams;
--    };
--  }
--
--  if (!('addStream' in window.RTCPeerConnection.prototype)) {
--    var _addTrack = window.RTCPeerConnection.prototype.addTrack;
--
--    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
--      var _this = this;
--
--      if (!this._localStreams) {
--        this._localStreams = [];
--      }
--
--      if (!this._localStreams.includes(stream)) {
--        this._localStreams.push(stream);
--      } // Try to emulate Chrome's behaviour of adding in audio-video order.
--      // Safari orders by track id.
--
--
--      stream.getAudioTracks().forEach(function (track) {
--        return _addTrack.call(_this, track, stream);
--      });
--      stream.getVideoTracks().forEach(function (track) {
--        return _addTrack.call(_this, track, stream);
--      });
--    };
--
--    window.RTCPeerConnection.prototype.addTrack = function addTrack(track) {
--      var _this2 = this;
--
--      for (var _len = arguments.length, streams = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
--        streams[_key - 1] = arguments[_key];
--      }
--
--      if (streams) {
--        streams.forEach(function (stream) {
--          if (!_this2._localStreams) {
--            _this2._localStreams = [stream];
--          } else if (!_this2._localStreams.includes(stream)) {
--            _this2._localStreams.push(stream);
--          }
--        });
--      }
--
--      return _addTrack.apply(this, arguments);
--    };
--  }
--
--  if (!('removeStream' in window.RTCPeerConnection.prototype)) {
--    window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
--      var _this3 = this;
--
--      if (!this._localStreams) {
--        this._localStreams = [];
--      }
--
--      var index = this._localStreams.indexOf(stream);
--
--      if (index === -1) {
--        return;
--      }
--
--      this._localStreams.splice(index, 1);
--
--      var tracks = stream.getTracks();
--      this.getSenders().forEach(function (sender) {
--        if (tracks.includes(sender.track)) {
--          _this3.removeTrack(sender);
--        }
--      });
--    };
--  }
--}
--
--function shimRemoteStreamsAPI(window) {
--  if (_typeof(window) !== 'object' || !window.RTCPeerConnection) {
--    return;
--  }
--
--  if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {
--    window.RTCPeerConnection.prototype.getRemoteStreams = function getRemoteStreams() {
--      return this._remoteStreams ? this._remoteStreams : [];
--    };
--  }
--
--  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {
--    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {
--      get: function () {
--        return this._onaddstream;
--      },
--      set: function (f) {
--        var _this4 = this;
--
--        if (this._onaddstream) {
--          this.removeEventListener('addstream', this._onaddstream);
--          this.removeEventListener('track', this._onaddstreampoly);
--        }
--
--        this.addEventListener('addstream', this._onaddstream = f);
--        this.addEventListener('track', this._onaddstreampoly = function (e) {
--          e.streams.forEach(function (stream) {
--            if (!_this4._remoteStreams) {
--              _this4._remoteStreams = [];
--            }
--
--            if (_this4._remoteStreams.includes(stream)) {
--              return;
--            }
--
--            _this4._remoteStreams.push(stream);
--
--            var event = new Event('addstream');
--            event.stream = stream;
--
--            _this4.dispatchEvent(event);
--          });
--        });
--      }
--    });
--    var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
--
--    window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
--      var pc = this;
--
--      if (!this._onaddstreampoly) {
--        this.addEventListener('track', this._onaddstreampoly = function (e) {
--          e.streams.forEach(function (stream) {
--            if (!pc._remoteStreams) {
--              pc._remoteStreams = [];
--            }
--
--            if (pc._remoteStreams.indexOf(stream) >= 0) {
--              return;
--            }
--
--            pc._remoteStreams.push(stream);
--
--            var event = new Event('addstream');
--            event.stream = stream;
--            pc.dispatchEvent(event);
--          });
--        });
--      }
--
--      return origSetRemoteDescription.apply(pc, arguments);
--    };
--  }
--}
--
--function shimCallbacksAPI(window) {
--  if (_typeof(window) !== 'object' || !window.RTCPeerConnection) {
--    return;
--  }
--
--  var prototype = window.RTCPeerConnection.prototype;
--  var origCreateOffer = prototype.createOffer;
--  var origCreateAnswer = prototype.createAnswer;
--  var setLocalDescription = prototype.setLocalDescription;
--  var setRemoteDescription = prototype.setRemoteDescription;
--  var addIceCandidate = prototype.addIceCandidate;
--
--  prototype.createOffer = function createOffer(successCallback, failureCallback) {
--    var options = arguments.length >= 2 ? arguments[2] : arguments[0];
--    var promise = origCreateOffer.apply(this, [options]);
--
--    if (!failureCallback) {
--      return promise;
--    }
--
--    promise.then(successCallback, failureCallback);
--    return Promise.resolve();
--  };
--
--  prototype.createAnswer = function createAnswer(successCallback, failureCallback) {
--    var options = arguments.length >= 2 ? arguments[2] : arguments[0];
--    var promise = origCreateAnswer.apply(this, [options]);
--
--    if (!failureCallback) {
--      return promise;
--    }
--
--    promise.then(successCallback, failureCallback);
--    return Promise.resolve();
--  };
--
--  var withCallback = function (description, successCallback, failureCallback) {
--    var promise = setLocalDescription.apply(this, [description]);
--
--    if (!failureCallback) {
--      return promise;
--    }
--
--    promise.then(successCallback, failureCallback);
--    return Promise.resolve();
--  };
--
--  prototype.setLocalDescription = withCallback;
--
--  withCallback = function (description, successCallback, failureCallback) {
--    var promise = setRemoteDescription.apply(this, [description]);
--
--    if (!failureCallback) {
--      return promise;
--    }
--
--    promise.then(successCallback, failureCallback);
--    return Promise.resolve();
--  };
--
--  prototype.setRemoteDescription = withCallback;
--
--  withCallback = function (candidate, successCallback, failureCallback) {
--    var promise = addIceCandidate.apply(this, [candidate]);
--
--    if (!failureCallback) {
--      return promise;
--    }
--
--    promise.then(successCallback, failureCallback);
--    return Promise.resolve();
--  };
--
--  prototype.addIceCandidate = withCallback;
--}
--
--function shimGetUserMedia(window) {
--  var navigator = window && window.navigator;
--
--  if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
--    // shim not needed in Safari 12.1
--    var mediaDevices = navigator.mediaDevices;
--
--    var _getUserMedia = mediaDevices.getUserMedia.bind(mediaDevices);
--
--    navigator.mediaDevices.getUserMedia = function (constraints) {
--      return _getUserMedia(shimConstraints(constraints));
--    };
--  }
--
--  if (!navigator.getUserMedia && navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
--    navigator.getUserMedia = function getUserMedia(constraints, cb, errcb) {
--      navigator.mediaDevices.getUserMedia(constraints).then(cb, errcb);
--    }.bind(navigator);
--  }
--}
--
--function shimConstraints(constraints) {
--  if (constraints && constraints.video !== undefined) {
--    return Object.assign({}, constraints, {
--      video: utils.compactObject(constraints.video)
--    });
--  }
--
--  return constraints;
--}
--
--function shimRTCIceServerUrls(window) {
--  if (!window.RTCPeerConnection) {
--    return;
--  } // migrate from non-spec RTCIceServer.url to RTCIceServer.urls
--
--
--  var OrigPeerConnection = window.RTCPeerConnection;
--
--  window.RTCPeerConnection = function RTCPeerConnection(pcConfig, pcConstraints) {
--    if (pcConfig && pcConfig.iceServers) {
--      var newIceServers = [];
--
--      for (var i = 0; i < pcConfig.iceServers.length; i++) {
--        var server = pcConfig.iceServers[i];
--
--        if (!server.hasOwnProperty('urls') && server.hasOwnProperty('url')) {
--          utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');
--          server = JSON.parse(JSON.stringify(server));
--          server.urls = server.url;
--          delete server.url;
--          newIceServers.push(server);
--        } else {
--          newIceServers.push(pcConfig.iceServers[i]);
--        }
--      }
--
--      pcConfig.iceServers = newIceServers;
--    }
--
--    return new OrigPeerConnection(pcConfig, pcConstraints);
--  };
--
--  window.RTCPeerConnection.prototype = OrigPeerConnection.prototype; // wrap static methods. Currently just generateCertificate.
--
--  if ('generateCertificate' in OrigPeerConnection) {
--    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
--      get: function () {
--        return OrigPeerConnection.generateCertificate;
--      }
--    });
--  }
--}
--
--function shimTrackEventTransceiver(window) {
--  // Add event.transceiver member over deprecated event.receiver
--  if (_typeof(window) === 'object' && window.RTCTrackEvent && 'receiver' in window.RTCTrackEvent.prototype && !('transceiver' in window.RTCTrackEvent.prototype)) {
--    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
--      get: function () {
--        return {
--          receiver: this.receiver
--        };
--      }
--    });
--  }
--}
--
--function shimCreateOfferLegacy(window) {
--  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;
--
--  window.RTCPeerConnection.prototype.createOffer = function createOffer(offerOptions) {
--    if (offerOptions) {
--      if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {
--        // support bit values
--        offerOptions.offerToReceiveAudio = !!offerOptions.offerToReceiveAudio;
--      }
--
--      var audioTransceiver = this.getTransceivers().find(function (transceiver) {
--        return transceiver.receiver.track.kind === 'audio';
--      });
--
--      if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {
--        if (audioTransceiver.direction === 'sendrecv') {
--          if (audioTransceiver.setDirection) {
--            audioTransceiver.setDirection('sendonly');
--          } else {
--            audioTransceiver.direction = 'sendonly';
--          }
--        } else if (audioTransceiver.direction === 'recvonly') {
--          if (audioTransceiver.setDirection) {
--            audioTransceiver.setDirection('inactive');
--          } else {
--            audioTransceiver.direction = 'inactive';
--          }
--        }
--      } else if (offerOptions.offerToReceiveAudio === true && !audioTransceiver) {
--        this.addTransceiver('audio');
--      }
--
--      if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {
--        // support bit values
--        offerOptions.offerToReceiveVideo = !!offerOptions.offerToReceiveVideo;
--      }
--
--      var videoTransceiver = this.getTransceivers().find(function (transceiver) {
--        return transceiver.receiver.track.kind === 'video';
--      });
--
--      if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {
--        if (videoTransceiver.direction === 'sendrecv') {
--          if (videoTransceiver.setDirection) {
--            videoTransceiver.setDirection('sendonly');
--          } else {
--            videoTransceiver.direction = 'sendonly';
--          }
--        } else if (videoTransceiver.direction === 'recvonly') {
--          if (videoTransceiver.setDirection) {
--            videoTransceiver.setDirection('inactive');
--          } else {
--            videoTransceiver.direction = 'inactive';
--          }
--        }
--      } else if (offerOptions.offerToReceiveVideo === true && !videoTransceiver) {
--        this.addTransceiver('video');
--      }
--    }
--
--    return origCreateOffer.apply(this, arguments);
--  };
--}
--
--function shimAudioContext(window) {
--  if (_typeof(window) !== 'object' || window.AudioContext) {
--    return;
--  }
--
--  window.AudioContext = window.webkitAudioContext;
--}
--},{"../utils":"iSxC"}],"GOQK":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.shimRTCIceCandidate = shimRTCIceCandidate;
--exports.shimMaxMessageSize = shimMaxMessageSize;
--exports.shimSendThrowTypeError = shimSendThrowTypeError;
--exports.shimConnectionState = shimConnectionState;
--exports.removeExtmapAllowMixed = removeExtmapAllowMixed;
--exports.shimAddIceCandidateNullOrEmpty = shimAddIceCandidateNullOrEmpty;
--
--var _sdp = _interopRequireDefault(require("sdp"));
--
--var utils = _interopRequireWildcard(require("./utils"));
--
--function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
--
--function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
--
--function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
--
--function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
--
--function shimRTCIceCandidate(window) {
--  // foundation is arbitrarily chosen as an indicator for full support for
--  // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface
--  if (!window.RTCIceCandidate || window.RTCIceCandidate && 'foundation' in window.RTCIceCandidate.prototype) {
--    return;
--  }
--
--  var NativeRTCIceCandidate = window.RTCIceCandidate;
--
--  window.RTCIceCandidate = function RTCIceCandidate(args) {
--    // Remove the a= which shouldn't be part of the candidate string.
--    if (_typeof(args) === 'object' && args.candidate && args.candidate.indexOf('a=') === 0) {
--      args = JSON.parse(JSON.stringify(args));
--      args.candidate = args.candidate.substr(2);
--    }
--
--    if (args.candidate && args.candidate.length) {
--      // Augment the native candidate with the parsed fields.
--      var nativeCandidate = new NativeRTCIceCandidate(args);
--
--      var parsedCandidate = _sdp.default.parseCandidate(args.candidate);
--
--      var augmentedCandidate = Object.assign(nativeCandidate, parsedCandidate); // Add a serializer that does not serialize the extra attributes.
--
--      augmentedCandidate.toJSON = function toJSON() {
--        return {
--          candidate: augmentedCandidate.candidate,
--          sdpMid: augmentedCandidate.sdpMid,
--          sdpMLineIndex: augmentedCandidate.sdpMLineIndex,
--          usernameFragment: augmentedCandidate.usernameFragment
--        };
--      };
--
--      return augmentedCandidate;
--    }
--
--    return new NativeRTCIceCandidate(args);
--  };
--
--  window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype; // Hook up the augmented candidate in onicecandidate and
--  // addEventListener('icecandidate', ...)
--
--  utils.wrapPeerConnectionEvent(window, 'icecandidate', function (e) {
--    if (e.candidate) {
--      Object.defineProperty(e, 'candidate', {
--        value: new window.RTCIceCandidate(e.candidate),
--        writable: 'false'
--      });
--    }
--
--    return e;
--  });
--}
--
--function shimMaxMessageSize(window, browserDetails) {
--  if (!window.RTCPeerConnection) {
--    return;
--  }
--
--  if (!('sctp' in window.RTCPeerConnection.prototype)) {
--    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {
--      get: function () {
--        return typeof this._sctp === 'undefined' ? null : this._sctp;
--      }
--    });
--  }
--
--  var sctpInDescription = function (description) {
--    if (!description || !description.sdp) {
--      return false;
--    }
--
--    var sections = _sdp.default.splitSections(description.sdp);
--
--    sections.shift();
--    return sections.some(function (mediaSection) {
--      var mLine = _sdp.default.parseMLine(mediaSection);
--
--      return mLine && mLine.kind === 'application' && mLine.protocol.indexOf('SCTP') !== -1;
--    });
--  };
--
--  var getRemoteFirefoxVersion = function (description) {
--    // TODO: Is there a better solution for detecting Firefox?
--    var match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\d+)/);
--
--    if (match === null || match.length < 2) {
--      return -1;
--    }
--
--    var version = parseInt(match[1], 10); // Test for NaN (yes, this is ugly)
--
--    return version !== version ? -1 : version;
--  };
--
--  var getCanSendMaxMessageSize = function (remoteIsFirefox) {
--    // Every implementation we know can send at least 64 KiB.
--    // Note: Although Chrome is technically able to send up to 256 KiB, the
--    //       data does not reach the other peer reliably.
--    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419
--    var canSendMaxMessageSize = 65536;
--
--    if (browserDetails.browser === 'firefox') {
--      if (browserDetails.version < 57) {
--        if (remoteIsFirefox === -1) {
--          // FF < 57 will send in 16 KiB chunks using the deprecated PPID
--          // fragmentation.
--          canSendMaxMessageSize = 16384;
--        } else {
--          // However, other FF (and RAWRTC) can reassemble PPID-fragmented
--          // messages. Thus, supporting ~2 GiB when sending.
--          canSendMaxMessageSize = 2147483637;
--        }
--      } else if (browserDetails.version < 60) {
--        // Currently, all FF >= 57 will reset the remote maximum message size
--        // to the default value when a data channel is created at a later
--        // stage. :(
--        // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831
--        canSendMaxMessageSize = browserDetails.version === 57 ? 65535 : 65536;
--      } else {
--        // FF >= 60 supports sending ~2 GiB
--        canSendMaxMessageSize = 2147483637;
--      }
--    }
--
--    return canSendMaxMessageSize;
--  };
--
--  var getMaxMessageSize = function (description, remoteIsFirefox) {
--    // Note: 65536 bytes is the default value from the SDP spec. Also,
--    //       every implementation we know supports receiving 65536 bytes.
--    var maxMessageSize = 65536; // FF 57 has a slightly incorrect default remote max message size, so
--    // we need to adjust it here to avoid a failure when sending.
--    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697
--
--    if (browserDetails.browser === 'firefox' && browserDetails.version === 57) {
--      maxMessageSize = 65535;
--    }
--
--    var match = _sdp.default.matchPrefix(description.sdp, 'a=max-message-size:');
--
--    if (match.length > 0) {
--      maxMessageSize = parseInt(match[0].substr(19), 10);
--    } else if (browserDetails.browser === 'firefox' && remoteIsFirefox !== -1) {
--      // If the maximum message size is not present in the remote SDP and
--      // both local and remote are Firefox, the remote peer can receive
--      // ~2 GiB.
--      maxMessageSize = 2147483637;
--    }
--
--    return maxMessageSize;
--  };
--
--  var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
--
--  window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
--    this._sctp = null; // Chrome decided to not expose .sctp in plan-b mode.
--    // As usual, adapter.js has to do an 'ugly worakaround'
--    // to cover up the mess.
--
--    if (browserDetails.browser === 'chrome' && browserDetails.version >= 76) {
--      var {
--        sdpSemantics: sdpSemantics
--      } = this.getConfiguration();
--
--      if (sdpSemantics === 'plan-b') {
--        Object.defineProperty(this, 'sctp', {
--          get: function () {
--            return typeof this._sctp === 'undefined' ? null : this._sctp;
--          },
--          enumerable: true,
--          configurable: true
--        });
--      }
--    }
--
--    if (sctpInDescription(arguments[0])) {
--      // Check if the remote is FF.
--      var isFirefox = getRemoteFirefoxVersion(arguments[0]); // Get the maximum message size the local peer is capable of sending
--
--      var canSendMMS = getCanSendMaxMessageSize(isFirefox); // Get the maximum message size of the remote peer.
--
--      var remoteMMS = getMaxMessageSize(arguments[0], isFirefox); // Determine final maximum message size
--
--      var maxMessageSize;
--
--      if (canSendMMS === 0 && remoteMMS === 0) {
--        maxMessageSize = Number.POSITIVE_INFINITY;
--      } else if (canSendMMS === 0 || remoteMMS === 0) {
--        maxMessageSize = Math.max(canSendMMS, remoteMMS);
--      } else {
--        maxMessageSize = Math.min(canSendMMS, remoteMMS);
--      } // Create a dummy RTCSctpTransport object and the 'maxMessageSize'
--      // attribute.
--
--
--      var sctp = {};
--      Object.defineProperty(sctp, 'maxMessageSize', {
--        get: function () {
--          return maxMessageSize;
--        }
--      });
--      this._sctp = sctp;
--    }
--
--    return origSetRemoteDescription.apply(this, arguments);
--  };
--}
--
--function shimSendThrowTypeError(window) {
--  if (!(window.RTCPeerConnection && 'createDataChannel' in window.RTCPeerConnection.prototype)) {
--    return;
--  } // Note: Although Firefox >= 57 has a native implementation, the maximum
--  //       message size can be reset for all data channels at a later stage.
--  //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831
--
--
--  function wrapDcSend(dc, pc) {
--    var origDataChannelSend = dc.send;
--
--    dc.send = function send() {
--      var data = arguments[0];
--      var length = data.length || data.size || data.byteLength;
--
--      if (dc.readyState === 'open' && pc.sctp && length > pc.sctp.maxMessageSize) {
--        throw new TypeError('Message too large (can send a maximum of ' + pc.sctp.maxMessageSize + ' bytes)');
--      }
--
--      return origDataChannelSend.apply(dc, arguments);
--    };
--  }
--
--  var origCreateDataChannel = window.RTCPeerConnection.prototype.createDataChannel;
--
--  window.RTCPeerConnection.prototype.createDataChannel = function createDataChannel() {
--    var dataChannel = origCreateDataChannel.apply(this, arguments);
--    wrapDcSend(dataChannel, this);
--    return dataChannel;
--  };
--
--  utils.wrapPeerConnectionEvent(window, 'datachannel', function (e) {
--    wrapDcSend(e.channel, e.target);
--    return e;
--  });
--}
--/* shims RTCConnectionState by pretending it is the same as iceConnectionState.
-- * See https://bugs.chromium.org/p/webrtc/issues/detail?id=6145#c12
-- * for why this is a valid hack in Chrome. In Firefox it is slightly incorrect
-- * since DTLS failures would be hidden. See
-- * https://bugzilla.mozilla.org/show_bug.cgi?id=1265827
-- * for the Firefox tracking bug.
-- */
--
--
--function shimConnectionState(window) {
--  if (!window.RTCPeerConnection || 'connectionState' in window.RTCPeerConnection.prototype) {
--    return;
--  }
--
--  var proto = window.RTCPeerConnection.prototype;
--  Object.defineProperty(proto, 'connectionState', {
--    get: function () {
--      return {
--        completed: 'connected',
--        checking: 'connecting'
--      }[this.iceConnectionState] || this.iceConnectionState;
--    },
--    enumerable: true,
--    configurable: true
--  });
--  Object.defineProperty(proto, 'onconnectionstatechange', {
--    get: function () {
--      return this._onconnectionstatechange || null;
--    },
--    set: function (cb) {
--      if (this._onconnectionstatechange) {
--        this.removeEventListener('connectionstatechange', this._onconnectionstatechange);
--        delete this._onconnectionstatechange;
--      }
--
--      if (cb) {
--        this.addEventListener('connectionstatechange', this._onconnectionstatechange = cb);
--      }
--    },
--    enumerable: true,
--    configurable: true
--  });
--  ['setLocalDescription', 'setRemoteDescription'].forEach(function (method) {
--    var origMethod = proto[method];
--
--    proto[method] = function () {
--      if (!this._connectionstatechangepoly) {
--        this._connectionstatechangepoly = function (e) {
--          var pc = e.target;
--
--          if (pc._lastConnectionState !== pc.connectionState) {
--            pc._lastConnectionState = pc.connectionState;
--            var newEvent = new Event('connectionstatechange', e);
--            pc.dispatchEvent(newEvent);
--          }
--
--          return e;
--        };
--
--        this.addEventListener('iceconnectionstatechange', this._connectionstatechangepoly);
--      }
--
--      return origMethod.apply(this, arguments);
--    };
--  });
--}
--
--function removeExtmapAllowMixed(window, browserDetails) {
--  /* remove a=extmap-allow-mixed for webrtc.org < M71 */
--  if (!window.RTCPeerConnection) {
--    return;
--  }
--
--  if (browserDetails.browser === 'chrome' && browserDetails.version >= 71) {
--    return;
--  }
--
--  if (browserDetails.browser === 'safari' && browserDetails.version >= 605) {
--    return;
--  }
--
--  var nativeSRD = window.RTCPeerConnection.prototype.setRemoteDescription;
--
--  window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription(desc) {
--    if (desc && desc.sdp && desc.sdp.indexOf('\na=extmap-allow-mixed') !== -1) {
--      var sdp = desc.sdp.split('\n').filter(function (line) {
--        return line.trim() !== 'a=extmap-allow-mixed';
--      }).join('\n'); // Safari enforces read-only-ness of RTCSessionDescription fields.
--
--      if (window.RTCSessionDescription && desc instanceof window.RTCSessionDescription) {
--        arguments[0] = new window.RTCSessionDescription({
--          type: desc.type,
--          sdp: sdp
--        });
--      } else {
--        desc.sdp = sdp;
--      }
--    }
--
--    return nativeSRD.apply(this, arguments);
--  };
--}
--
--function shimAddIceCandidateNullOrEmpty(window, browserDetails) {
--  // Support for addIceCandidate(null or undefined)
--  // as well as addIceCandidate({candidate: "", ...})
--  // https://bugs.chromium.org/p/chromium/issues/detail?id=978582
--  // Note: must be called before other polyfills which change the signature.
--  if (!(window.RTCPeerConnection && window.RTCPeerConnection.prototype)) {
--    return;
--  }
--
--  var nativeAddIceCandidate = window.RTCPeerConnection.prototype.addIceCandidate;
--
--  if (!nativeAddIceCandidate || nativeAddIceCandidate.length === 0) {
--    return;
--  }
--
--  window.RTCPeerConnection.prototype.addIceCandidate = function addIceCandidate() {
--    if (!arguments[0]) {
--      if (arguments[1]) {
--        arguments[1].apply(null);
--      }
--
--      return Promise.resolve();
--    } // Firefox 68+ emits and processes {candidate: "", ...}, ignore
--    // in older versions.
--    // Native support for ignoring exists for Chrome M77+.
--    // Safari ignores as well, exact version unknown but works in the same
--    // version that also ignores addIceCandidate(null).
--
--
--    if ((browserDetails.browser === 'chrome' && browserDetails.version < 78 || browserDetails.browser === 'firefox' && browserDetails.version < 68 || browserDetails.browser === 'safari') && arguments[0] && arguments[0].candidate === '') {
--      return Promise.resolve();
--    }
--
--    return nativeAddIceCandidate.apply(this, arguments);
--  };
--}
--},{"sdp":"YHvh","./utils":"iSxC"}],"KtlG":[function(require,module,exports) {
--"use strict";
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.adapterFactory = adapterFactory;
--
--var utils = _interopRequireWildcard(require("./utils"));
--
--var chromeShim = _interopRequireWildcard(require("./chrome/chrome_shim"));
--
--var edgeShim = _interopRequireWildcard(require("./edge/edge_shim"));
--
--var firefoxShim = _interopRequireWildcard(require("./firefox/firefox_shim"));
--
--var safariShim = _interopRequireWildcard(require("./safari/safari_shim"));
--
--var commonShim = _interopRequireWildcard(require("./common_shim"));
--
--function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
--
--function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
--
--/*
-- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--// Browser shims.
--// Shimming starts here.
--function adapterFactory() {
--  var {
--    window: window
--  } = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
--  var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
--    shimChrome: true,
--    shimFirefox: true,
--    shimEdge: true,
--    shimSafari: true
--  };
--  // Utils.
--  var logging = utils.log;
--  var browserDetails = utils.detectBrowser(window);
--  var adapter = {
--    browserDetails: browserDetails,
--    commonShim: commonShim,
--    extractVersion: utils.extractVersion,
--    disableLog: utils.disableLog,
--    disableWarnings: utils.disableWarnings
--  }; // Shim browser if found.
--
--  switch (browserDetails.browser) {
--    case 'chrome':
--      if (!chromeShim || !chromeShim.shimPeerConnection || !options.shimChrome) {
--        logging('Chrome shim is not included in this adapter release.');
--        return adapter;
--      }
--
--      if (browserDetails.version === null) {
--        logging('Chrome shim can not determine version, not shimming.');
--        return adapter;
--      }
--
--      logging('adapter.js shimming chrome.'); // Export to the adapter global object visible in the browser.
--
--      adapter.browserShim = chromeShim; // Must be called before shimPeerConnection.
--
--      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);
--      chromeShim.shimGetUserMedia(window, browserDetails);
--      chromeShim.shimMediaStream(window, browserDetails);
--      chromeShim.shimPeerConnection(window, browserDetails);
--      chromeShim.shimOnTrack(window, browserDetails);
--      chromeShim.shimAddTrackRemoveTrack(window, browserDetails);
--      chromeShim.shimGetSendersWithDtmf(window, browserDetails);
--      chromeShim.shimGetStats(window, browserDetails);
--      chromeShim.shimSenderReceiverGetStats(window, browserDetails);
--      chromeShim.fixNegotiationNeeded(window, browserDetails);
--      commonShim.shimRTCIceCandidate(window, browserDetails);
--      commonShim.shimConnectionState(window, browserDetails);
--      commonShim.shimMaxMessageSize(window, browserDetails);
--      commonShim.shimSendThrowTypeError(window, browserDetails);
--      commonShim.removeExtmapAllowMixed(window, browserDetails);
--      break;
--
--    case 'firefox':
--      if (!firefoxShim || !firefoxShim.shimPeerConnection || !options.shimFirefox) {
--        logging('Firefox shim is not included in this adapter release.');
--        return adapter;
--      }
--
--      logging('adapter.js shimming firefox.'); // Export to the adapter global object visible in the browser.
--
--      adapter.browserShim = firefoxShim; // Must be called before shimPeerConnection.
--
--      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);
--      firefoxShim.shimGetUserMedia(window, browserDetails);
--      firefoxShim.shimPeerConnection(window, browserDetails);
--      firefoxShim.shimOnTrack(window, browserDetails);
--      firefoxShim.shimRemoveStream(window, browserDetails);
--      firefoxShim.shimSenderGetStats(window, browserDetails);
--      firefoxShim.shimReceiverGetStats(window, browserDetails);
--      firefoxShim.shimRTCDataChannel(window, browserDetails);
--      firefoxShim.shimAddTransceiver(window, browserDetails);
--      firefoxShim.shimGetParameters(window, browserDetails);
--      firefoxShim.shimCreateOffer(window, browserDetails);
--      firefoxShim.shimCreateAnswer(window, browserDetails);
--      commonShim.shimRTCIceCandidate(window, browserDetails);
--      commonShim.shimConnectionState(window, browserDetails);
--      commonShim.shimMaxMessageSize(window, browserDetails);
--      commonShim.shimSendThrowTypeError(window, browserDetails);
--      break;
--
--    case 'edge':
--      if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {
--        logging('MS edge shim is not included in this adapter release.');
--        return adapter;
--      }
--
--      logging('adapter.js shimming edge.'); // Export to the adapter global object visible in the browser.
--
--      adapter.browserShim = edgeShim;
--      edgeShim.shimGetUserMedia(window, browserDetails);
--      edgeShim.shimGetDisplayMedia(window, browserDetails);
--      edgeShim.shimPeerConnection(window, browserDetails);
--      edgeShim.shimReplaceTrack(window, browserDetails); // the edge shim implements the full RTCIceCandidate object.
--
--      commonShim.shimMaxMessageSize(window, browserDetails);
--      commonShim.shimSendThrowTypeError(window, browserDetails);
--      break;
--
--    case 'safari':
--      if (!safariShim || !options.shimSafari) {
--        logging('Safari shim is not included in this adapter release.');
--        return adapter;
--      }
--
--      logging('adapter.js shimming safari.'); // Export to the adapter global object visible in the browser.
--
--      adapter.browserShim = safariShim; // Must be called before shimCallbackAPI.
--
--      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);
--      safariShim.shimRTCIceServerUrls(window, browserDetails);
--      safariShim.shimCreateOfferLegacy(window, browserDetails);
--      safariShim.shimCallbacksAPI(window, browserDetails);
--      safariShim.shimLocalStreamsAPI(window, browserDetails);
--      safariShim.shimRemoteStreamsAPI(window, browserDetails);
--      safariShim.shimTrackEventTransceiver(window, browserDetails);
--      safariShim.shimGetUserMedia(window, browserDetails);
--      safariShim.shimAudioContext(window, browserDetails);
--      commonShim.shimRTCIceCandidate(window, browserDetails);
--      commonShim.shimMaxMessageSize(window, browserDetails);
--      commonShim.shimSendThrowTypeError(window, browserDetails);
--      commonShim.removeExtmapAllowMixed(window, browserDetails);
--      break;
--
--    default:
--      logging('Unsupported browser!');
--      break;
--  }
--
--  return adapter;
--}
--},{"./utils":"iSxC","./chrome/chrome_shim":"uI5X","./edge/edge_shim":"XRic","./firefox/firefox_shim":"Fzdr","./safari/safari_shim":"t1lL","./common_shim":"GOQK"}],"tI1X":[function(require,module,exports) {
--/*
-- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-- *
-- *  Use of this source code is governed by a BSD-style license
-- *  that can be found in the LICENSE file in the root of the source
-- *  tree.
-- */
--
--/* eslint-env node */
--'use strict';
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.default = void 0;
--
--var _adapter_factory = require("./adapter_factory.js");
--
--var adapter = (0, _adapter_factory.adapterFactory)({
--  window: typeof window === 'undefined' ? undefined : window
--});
--var _default = adapter;
--exports.default = _default;
--},{"./adapter_factory.js":"KtlG"}],"sXtV":[function(require,module,exports) {
--"use strict";
--
--var __importDefault = this && this.__importDefault || function (mod) {
--  return mod && mod.__esModule ? mod : {
--    "default": mod
--  };
--};
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.webRTCAdapter = void 0;
--
--var webrtc_adapter_1 = __importDefault(require("webrtc-adapter"));
--
--exports.webRTCAdapter = webrtc_adapter_1.default;
--},{"webrtc-adapter":"tI1X"}],"I31f":[function(require,module,exports) {
--"use strict";
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.Supports = void 0;
--
--var adapter_1 = require("./adapter");
--
--exports.Supports = new (
--/** @class */
--function () {
--  function class_1() {
--    this.isIOS = ['iPad', 'iPhone', 'iPod'].includes(navigator.platform);
--    this.supportedBrowsers = ['firefox', 'chrome', 'safari'];
--    this.minFirefoxVersion = 59;
--    this.minChromeVersion = 72;
--    this.minSafariVersion = 605;
--  }
--
--  class_1.prototype.isWebRTCSupported = function () {
--    return typeof RTCPeerConnection !== 'undefined';
--  };
--
--  class_1.prototype.isBrowserSupported = function () {
--    var browser = this.getBrowser();
--    var version = this.getVersion();
--    var validBrowser = this.supportedBrowsers.includes(browser);
--    if (!validBrowser) return false;
--    if (browser === 'chrome') return version >= this.minChromeVersion;
--    if (browser === 'firefox') return version >= this.minFirefoxVersion;
--    if (browser === 'safari') return !this.isIOS && version >= this.minSafariVersion;
--    return false;
--  };
--
--  class_1.prototype.getBrowser = function () {
--    return adapter_1.webRTCAdapter.browserDetails.browser;
--  };
--
--  class_1.prototype.getVersion = function () {
--    return adapter_1.webRTCAdapter.browserDetails.version || 0;
--  };
--
--  class_1.prototype.isUnifiedPlanSupported = function () {
--    var browser = this.getBrowser();
--    var version = adapter_1.webRTCAdapter.browserDetails.version || 0;
--    if (browser === 'chrome' && version < 72) return false;
--    if (browser === 'firefox' && version >= 59) return true;
--    if (!window.RTCRtpTransceiver || !('currentDirection' in RTCRtpTransceiver.prototype)) return false;
--    var tempPc;
--    var supported = false;
--
--    try {
--      tempPc = new RTCPeerConnection();
--      tempPc.addTransceiver('audio');
--      supported = true;
--    } catch (e) {} finally {
--      if (tempPc) {
--        tempPc.close();
--      }
--    }
--
--    return supported;
--  };
--
--  class_1.prototype.toString = function () {
--    return "Supports: \n    browser:" + this.getBrowser() + " \n    version:" + this.getVersion() + " \n    isIOS:" + this.isIOS + " \n    isWebRTCSupported:" + this.isWebRTCSupported() + " \n    isBrowserSupported:" + this.isBrowserSupported() + " \n    isUnifiedPlanSupported:" + this.isUnifiedPlanSupported();
--  };
--
--  return class_1;
--}())();
--},{"./adapter":"sXtV"}],"BHXf":[function(require,module,exports) {
--"use strict";
--
--var __createBinding = this && this.__createBinding || (Object.create ? function (o, m, k, k2) {
--  if (k2 === undefined) k2 = k;
--  Object.defineProperty(o, k2, {
--    enumerable: true,
--    get: function get() {
--      return m[k];
--    }
--  });
--} : function (o, m, k, k2) {
--  if (k2 === undefined) k2 = k;
--  o[k2] = m[k];
--});
--
--var __setModuleDefault = this && this.__setModuleDefault || (Object.create ? function (o, v) {
--  Object.defineProperty(o, "default", {
--    enumerable: true,
--    value: v
--  });
--} : function (o, v) {
--  o["default"] = v;
--});
--
--var __importStar = this && this.__importStar || function (mod) {
--  if (mod && mod.__esModule) return mod;
--  var result = {};
--  if (mod != null) for (var k in mod) {
--    if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
--  }
--
--  __setModuleDefault(result, mod);
--
--  return result;
--};
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.util = void 0;
--
--var BinaryPack = __importStar(require("peerjs-js-binarypack"));
--
--var supports_1 = require("./supports");
--
--var DEFAULT_CONFIG = {
--  iceServers: [{
--    urls: "stun:stun.l.google.com:19302"
--  }, {
--    urls: "turn:0.peerjs.com:3478",
--    username: "peerjs",
--    credential: "peerjsp"
--  }],
--  sdpSemantics: "unified-plan"
--};
--exports.util = new (
--/** @class */
--function () {
--  function class_1() {
--    this.CLOUD_HOST = "0.peerjs.com";
--    this.CLOUD_PORT = 443; // Browsers that need chunking:
--
--    this.chunkedBrowsers = {
--      Chrome: 1,
--      chrome: 1
--    };
--    this.chunkedMTU = 16300; // The original 60000 bytes setting does not work when sending data from Firefox to Chrome, which is "cut off" after 16384 bytes and delivered individually.
--    // Returns browser-agnostic default config
--
--    this.defaultConfig = DEFAULT_CONFIG;
--    this.browser = supports_1.Supports.getBrowser();
--    this.browserVersion = supports_1.Supports.getVersion(); // Lists which features are supported
--
--    this.supports = function () {
--      var supported = {
--        browser: supports_1.Supports.isBrowserSupported(),
--        webRTC: supports_1.Supports.isWebRTCSupported(),
--        audioVideo: false,
--        data: false,
--        binaryBlob: false,
--        reliable: false
--      };
--      if (!supported.webRTC) return supported;
--      var pc;
--
--      try {
--        pc = new RTCPeerConnection(DEFAULT_CONFIG);
--        supported.audioVideo = true;
--        var dc = void 0;
--
--        try {
--          dc = pc.createDataChannel("_PEERJSTEST", {
--            ordered: true
--          });
--          supported.data = true;
--          supported.reliable = !!dc.ordered; // Binary test
--
--          try {
--            dc.binaryType = "blob";
--            supported.binaryBlob = !supports_1.Supports.isIOS;
--          } catch (e) {}
--        } catch (e) {} finally {
--          if (dc) {
--            dc.close();
--          }
--        }
--      } catch (e) {} finally {
--        if (pc) {
--          pc.close();
--        }
--      }
--
--      return supported;
--    }();
--
--    this.pack = BinaryPack.pack;
--    this.unpack = BinaryPack.unpack; // Binary stuff
--
--    this._dataCount = 1;
--  }
--
--  class_1.prototype.noop = function () {}; // Ensure alphanumeric ids
--
--
--  class_1.prototype.validateId = function (id) {
--    // Allow empty ids
--    return !id || /^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/.test(id);
--  };
--
--  class_1.prototype.chunk = function (blob) {
--    var chunks = [];
--    var size = blob.size;
--    var total = Math.ceil(size / exports.util.chunkedMTU);
--    var index = 0;
--    var start = 0;
--
--    while (start < size) {
--      var end = Math.min(size, start + exports.util.chunkedMTU);
--      var b = blob.slice(start, end);
--      var chunk = {
--        __peerData: this._dataCount,
--        n: index,
--        data: b,
--        total: total
--      };
--      chunks.push(chunk);
--      start = end;
--      index++;
--    }
--
--    this._dataCount++;
--    return chunks;
--  };
--
--  class_1.prototype.blobToArrayBuffer = function (blob, cb) {
--    var fr = new FileReader();
--
--    fr.onload = function (evt) {
--      if (evt.target) {
--        cb(evt.target.result);
--      }
--    };
--
--    fr.readAsArrayBuffer(blob);
--    return fr;
--  };
--
--  class_1.prototype.binaryStringToArrayBuffer = function (binary) {
--    var byteArray = new Uint8Array(binary.length);
--
--    for (var i = 0; i < binary.length; i++) {
--      byteArray[i] = binary.charCodeAt(i) & 0xff;
--    }
--
--    return byteArray.buffer;
--  };
--
--  class_1.prototype.randomToken = function () {
--    return Math.random().toString(36).substr(2);
--  };
--
--  class_1.prototype.isSecure = function () {
--    return location.protocol === "https:";
--  };
--
--  return class_1;
--}())();
--},{"peerjs-js-binarypack":"kdPp","./supports":"I31f"}],"JJlS":[function(require,module,exports) {
--'use strict';
--
--var has = Object.prototype.hasOwnProperty
--  , prefix = '~';
--
--/**
-- * Constructor to create a storage for our `EE` objects.
-- * An `Events` instance is a plain object whose properties are event names.
-- *
-- * @constructor
-- * @private
-- */
--function Events() {}
--
--//
--// We try to not inherit from `Object.prototype`. In some engines creating an
--// instance in this way is faster than calling `Object.create(null)` directly.
--// If `Object.create(null)` is not supported we prefix the event names with a
--// character to make sure that the built-in object properties are not
--// overridden or used as an attack vector.
--//
--if (Object.create) {
--  Events.prototype = Object.create(null);
--
--  //
--  // This hack is needed because the `__proto__` property is still inherited in
--  // some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.
--  //
--  if (!new Events().__proto__) prefix = false;
--}
--
--/**
-- * Representation of a single event listener.
-- *
-- * @param {Function} fn The listener function.
-- * @param {*} context The context to invoke the listener with.
-- * @param {Boolean} [once=false] Specify if the listener is a one-time listener.
-- * @constructor
-- * @private
-- */
--function EE(fn, context, once) {
--  this.fn = fn;
--  this.context = context;
--  this.once = once || false;
--}
--
--/**
-- * Add a listener for a given event.
-- *
-- * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
-- * @param {(String|Symbol)} event The event name.
-- * @param {Function} fn The listener function.
-- * @param {*} context The context to invoke the listener with.
-- * @param {Boolean} once Specify if the listener is a one-time listener.
-- * @returns {EventEmitter}
-- * @private
-- */
--function addListener(emitter, event, fn, context, once) {
--  if (typeof fn !== 'function') {
--    throw new TypeError('The listener must be a function');
--  }
--
--  var listener = new EE(fn, context || emitter, once)
--    , evt = prefix ? prefix + event : event;
--
--  if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;
--  else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);
--  else emitter._events[evt] = [emitter._events[evt], listener];
--
--  return emitter;
--}
--
--/**
-- * Clear event by name.
-- *
-- * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
-- * @param {(String|Symbol)} evt The Event name.
-- * @private
-- */
--function clearEvent(emitter, evt) {
--  if (--emitter._eventsCount === 0) emitter._events = new Events();
--  else delete emitter._events[evt];
--}
--
--/**
-- * Minimal `EventEmitter` interface that is molded against the Node.js
-- * `EventEmitter` interface.
-- *
-- * @constructor
-- * @public
-- */
--function EventEmitter() {
--  this._events = new Events();
--  this._eventsCount = 0;
--}
--
--/**
-- * Return an array listing the events for which the emitter has registered
-- * listeners.
-- *
-- * @returns {Array}
-- * @public
-- */
--EventEmitter.prototype.eventNames = function eventNames() {
--  var names = []
--    , events
--    , name;
--
--  if (this._eventsCount === 0) return names;
--
--  for (name in (events = this._events)) {
--    if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);
--  }
--
--  if (Object.getOwnPropertySymbols) {
--    return names.concat(Object.getOwnPropertySymbols(events));
--  }
--
--  return names;
--};
--
--/**
-- * Return the listeners registered for a given event.
-- *
-- * @param {(String|Symbol)} event The event name.
-- * @returns {Array} The registered listeners.
-- * @public
-- */
--EventEmitter.prototype.listeners = function listeners(event) {
--  var evt = prefix ? prefix + event : event
--    , handlers = this._events[evt];
--
--  if (!handlers) return [];
--  if (handlers.fn) return [handlers.fn];
--
--  for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {
--    ee[i] = handlers[i].fn;
--  }
--
--  return ee;
--};
--
--/**
-- * Return the number of listeners listening to a given event.
-- *
-- * @param {(String|Symbol)} event The event name.
-- * @returns {Number} The number of listeners.
-- * @public
-- */
--EventEmitter.prototype.listenerCount = function listenerCount(event) {
--  var evt = prefix ? prefix + event : event
--    , listeners = this._events[evt];
--
--  if (!listeners) return 0;
--  if (listeners.fn) return 1;
--  return listeners.length;
--};
--
--/**
-- * Calls each of the listeners registered for a given event.
-- *
-- * @param {(String|Symbol)} event The event name.
-- * @returns {Boolean} `true` if the event had listeners, else `false`.
-- * @public
-- */
--EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
--  var evt = prefix ? prefix + event : event;
--
--  if (!this._events[evt]) return false;
--
--  var listeners = this._events[evt]
--    , len = arguments.length
--    , args
--    , i;
--
--  if (listeners.fn) {
--    if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);
--
--    switch (len) {
--      case 1: return listeners.fn.call(listeners.context), true;
--      case 2: return listeners.fn.call(listeners.context, a1), true;
--      case 3: return listeners.fn.call(listeners.context, a1, a2), true;
--      case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;
--      case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
--      case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
--    }
--
--    for (i = 1, args = new Array(len -1); i < len; i++) {
--      args[i - 1] = arguments[i];
--    }
--
--    listeners.fn.apply(listeners.context, args);
--  } else {
--    var length = listeners.length
--      , j;
--
--    for (i = 0; i < length; i++) {
--      if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);
--
--      switch (len) {
--        case 1: listeners[i].fn.call(listeners[i].context); break;
--        case 2: listeners[i].fn.call(listeners[i].context, a1); break;
--        case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;
--        case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;
--        default:
--          if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {
--            args[j - 1] = arguments[j];
--          }
--
--          listeners[i].fn.apply(listeners[i].context, args);
--      }
--    }
--  }
--
--  return true;
--};
--
--/**
-- * Add a listener for a given event.
-- *
-- * @param {(String|Symbol)} event The event name.
-- * @param {Function} fn The listener function.
-- * @param {*} [context=this] The context to invoke the listener with.
-- * @returns {EventEmitter} `this`.
-- * @public
-- */
--EventEmitter.prototype.on = function on(event, fn, context) {
--  return addListener(this, event, fn, context, false);
--};
--
--/**
-- * Add a one-time listener for a given event.
-- *
-- * @param {(String|Symbol)} event The event name.
-- * @param {Function} fn The listener function.
-- * @param {*} [context=this] The context to invoke the listener with.
-- * @returns {EventEmitter} `this`.
-- * @public
-- */
--EventEmitter.prototype.once = function once(event, fn, context) {
--  return addListener(this, event, fn, context, true);
--};
--
--/**
-- * Remove the listeners of a given event.
-- *
-- * @param {(String|Symbol)} event The event name.
-- * @param {Function} fn Only remove the listeners that match this function.
-- * @param {*} context Only remove the listeners that have this context.
-- * @param {Boolean} once Only remove one-time listeners.
-- * @returns {EventEmitter} `this`.
-- * @public
-- */
--EventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {
--  var evt = prefix ? prefix + event : event;
--
--  if (!this._events[evt]) return this;
--  if (!fn) {
--    clearEvent(this, evt);
--    return this;
--  }
--
--  var listeners = this._events[evt];
--
--  if (listeners.fn) {
--    if (
--      listeners.fn === fn &&
--      (!once || listeners.once) &&
--      (!context || listeners.context === context)
--    ) {
--      clearEvent(this, evt);
--    }
--  } else {
--    for (var i = 0, events = [], length = listeners.length; i < length; i++) {
--      if (
--        listeners[i].fn !== fn ||
--        (once && !listeners[i].once) ||
--        (context && listeners[i].context !== context)
--      ) {
--        events.push(listeners[i]);
--      }
--    }
--
--    //
--    // Reset the array, or remove it completely if we have no more listeners.
--    //
--    if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;
--    else clearEvent(this, evt);
--  }
--
--  return this;
--};
--
--/**
-- * Remove all listeners, or those of the specified event.
-- *
-- * @param {(String|Symbol)} [event] The event name.
-- * @returns {EventEmitter} `this`.
-- * @public
-- */
--EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
--  var evt;
--
--  if (event) {
--    evt = prefix ? prefix + event : event;
--    if (this._events[evt]) clearEvent(this, evt);
--  } else {
--    this._events = new Events();
--    this._eventsCount = 0;
--  }
--
--  return this;
--};
--
--//
--// Alias methods names because people roll like that.
--//
--EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
--EventEmitter.prototype.addListener = EventEmitter.prototype.on;
--
--//
--// Expose the prefix.
--//
--EventEmitter.prefixed = prefix;
--
--//
--// Allow `EventEmitter` to be imported as module namespace.
--//
--EventEmitter.EventEmitter = EventEmitter;
--
--//
--// Expose the module.
--//
--if ('undefined' !== typeof module) {
--  module.exports = EventEmitter;
--}
--
--},{}],"WOs9":[function(require,module,exports) {
--"use strict";
--
--var __read = this && this.__read || function (o, n) {
--  var m = typeof Symbol === "function" && o[Symbol.iterator];
--  if (!m) return o;
--  var i = m.call(o),
--      r,
--      ar = [],
--      e;
--
--  try {
--    while ((n === void 0 || n-- > 0) && !(r = i.next()).done) {
--      ar.push(r.value);
--    }
--  } catch (error) {
--    e = {
--      error: error
--    };
--  } finally {
--    try {
--      if (r && !r.done && (m = i["return"])) m.call(i);
--    } finally {
--      if (e) throw e.error;
--    }
--  }
--
--  return ar;
--};
--
--var __spreadArray = this && this.__spreadArray || function (to, from) {
--  for (var i = 0, il = from.length, j = to.length; i < il; i++, j++) {
--    to[j] = from[i];
--  }
--
--  return to;
--};
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.LogLevel = void 0;
--var LOG_PREFIX = 'PeerJS: ';
--/*
--Prints log messages depending on the debug level passed in. Defaults to 0.
--0  Prints no logs.
--1  Prints only errors.
--2  Prints errors and warnings.
--3  Prints all logs.
--*/
--
--var LogLevel;
--
--(function (LogLevel) {
--  LogLevel[LogLevel["Disabled"] = 0] = "Disabled";
--  LogLevel[LogLevel["Errors"] = 1] = "Errors";
--  LogLevel[LogLevel["Warnings"] = 2] = "Warnings";
--  LogLevel[LogLevel["All"] = 3] = "All";
--})(LogLevel = exports.LogLevel || (exports.LogLevel = {}));
--
--var Logger =
--/** @class */
--function () {
--  function Logger() {
--    this._logLevel = LogLevel.Disabled;
--  }
--
--  Object.defineProperty(Logger.prototype, "logLevel", {
--    get: function get() {
--      return this._logLevel;
--    },
--    set: function set(logLevel) {
--      this._logLevel = logLevel;
--    },
--    enumerable: false,
--    configurable: true
--  });
--
--  Logger.prototype.log = function () {
--    var args = [];
--
--    for (var _i = 0; _i < arguments.length; _i++) {
--      args[_i] = arguments[_i];
--    }
--
--    if (this._logLevel >= LogLevel.All) {
--      this._print.apply(this, __spreadArray([LogLevel.All], __read(args)));
--    }
--  };
--
--  Logger.prototype.warn = function () {
--    var args = [];
--
--    for (var _i = 0; _i < arguments.length; _i++) {
--      args[_i] = arguments[_i];
--    }
--
--    if (this._logLevel >= LogLevel.Warnings) {
--      this._print.apply(this, __spreadArray([LogLevel.Warnings], __read(args)));
--    }
--  };
--
--  Logger.prototype.error = function () {
--    var args = [];
--
--    for (var _i = 0; _i < arguments.length; _i++) {
--      args[_i] = arguments[_i];
--    }
--
--    if (this._logLevel >= LogLevel.Errors) {
--      this._print.apply(this, __spreadArray([LogLevel.Errors], __read(args)));
--    }
--  };
--
--  Logger.prototype.setLogFunction = function (fn) {
--    this._print = fn;
--  };
--
--  Logger.prototype._print = function (logLevel) {
--    var rest = [];
--
--    for (var _i = 1; _i < arguments.length; _i++) {
--      rest[_i - 1] = arguments[_i];
--    }
--
--    var copy = __spreadArray([LOG_PREFIX], __read(rest));
--
--    for (var i in copy) {
--      if (copy[i] instanceof Error) {
--        copy[i] = "(" + copy[i].name + ") " + copy[i].message;
--      }
--    }
--
--    if (logLevel >= LogLevel.All) {
--      console.log.apply(console, __spreadArray([], __read(copy)));
--    } else if (logLevel >= LogLevel.Warnings) {
--      console.warn.apply(console, __spreadArray(["WARNING"], __read(copy)));
--    } else if (logLevel >= LogLevel.Errors) {
--      console.error.apply(console, __spreadArray(["ERROR"], __read(copy)));
--    }
--  };
--
--  return Logger;
--}();
--
--exports.default = new Logger();
--},{}],"ZRYf":[function(require,module,exports) {
--"use strict";
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.ServerMessageType = exports.SocketEventType = exports.SerializationType = exports.PeerErrorType = exports.PeerEventType = exports.ConnectionType = exports.ConnectionEventType = void 0;
--var ConnectionEventType;
--
--(function (ConnectionEventType) {
--  ConnectionEventType["Open"] = "open";
--  ConnectionEventType["Stream"] = "stream";
--  ConnectionEventType["Data"] = "data";
--  ConnectionEventType["Close"] = "close";
--  ConnectionEventType["Error"] = "error";
--  ConnectionEventType["IceStateChanged"] = "iceStateChanged";
--})(ConnectionEventType = exports.ConnectionEventType || (exports.ConnectionEventType = {}));
--
--var ConnectionType;
--
--(function (ConnectionType) {
--  ConnectionType["Data"] = "data";
--  ConnectionType["Media"] = "media";
--})(ConnectionType = exports.ConnectionType || (exports.ConnectionType = {}));
--
--var PeerEventType;
--
--(function (PeerEventType) {
--  PeerEventType["Open"] = "open";
--  PeerEventType["Close"] = "close";
--  PeerEventType["Connection"] = "connection";
--  PeerEventType["Call"] = "call";
--  PeerEventType["Disconnected"] = "disconnected";
--  PeerEventType["Error"] = "error";
--})(PeerEventType = exports.PeerEventType || (exports.PeerEventType = {}));
--
--var PeerErrorType;
--
--(function (PeerErrorType) {
--  PeerErrorType["BrowserIncompatible"] = "browser-incompatible";
--  PeerErrorType["Disconnected"] = "disconnected";
--  PeerErrorType["InvalidID"] = "invalid-id";
--  PeerErrorType["InvalidKey"] = "invalid-key";
--  PeerErrorType["Network"] = "network";
--  PeerErrorType["PeerUnavailable"] = "peer-unavailable";
--  PeerErrorType["SslUnavailable"] = "ssl-unavailable";
--  PeerErrorType["ServerError"] = "server-error";
--  PeerErrorType["SocketError"] = "socket-error";
--  PeerErrorType["SocketClosed"] = "socket-closed";
--  PeerErrorType["UnavailableID"] = "unavailable-id";
--  PeerErrorType["WebRTC"] = "webrtc";
--})(PeerErrorType = exports.PeerErrorType || (exports.PeerErrorType = {}));
--
--var SerializationType;
--
--(function (SerializationType) {
--  SerializationType["Binary"] = "binary";
--  SerializationType["BinaryUTF8"] = "binary-utf8";
--  SerializationType["JSON"] = "json";
--})(SerializationType = exports.SerializationType || (exports.SerializationType = {}));
--
--var SocketEventType;
--
--(function (SocketEventType) {
--  SocketEventType["Message"] = "message";
--  SocketEventType["Disconnected"] = "disconnected";
--  SocketEventType["Error"] = "error";
--  SocketEventType["Close"] = "close";
--})(SocketEventType = exports.SocketEventType || (exports.SocketEventType = {}));
--
--var ServerMessageType;
--
--(function (ServerMessageType) {
--  ServerMessageType["Heartbeat"] = "HEARTBEAT";
--  ServerMessageType["Candidate"] = "CANDIDATE";
--  ServerMessageType["Offer"] = "OFFER";
--  ServerMessageType["Answer"] = "ANSWER";
--  ServerMessageType["Open"] = "OPEN";
--  ServerMessageType["Error"] = "ERROR";
--  ServerMessageType["IdTaken"] = "ID-TAKEN";
--  ServerMessageType["InvalidKey"] = "INVALID-KEY";
--  ServerMessageType["Leave"] = "LEAVE";
--  ServerMessageType["Expire"] = "EXPIRE"; // The offer sent to a peer has expired without response.
--})(ServerMessageType = exports.ServerMessageType || (exports.ServerMessageType = {}));
--},{}],"wJlv":[function(require,module,exports) {
--"use strict";
--
--var __extends = this && this.__extends || function () {
--  var _extendStatics = function extendStatics(d, b) {
--    _extendStatics = Object.setPrototypeOf || {
--      __proto__: []
--    } instanceof Array && function (d, b) {
--      d.__proto__ = b;
--    } || function (d, b) {
--      for (var p in b) {
--        if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p];
--      }
--    };
--
--    return _extendStatics(d, b);
--  };
--
--  return function (d, b) {
--    if (typeof b !== "function" && b !== null) throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
--
--    _extendStatics(d, b);
--
--    function __() {
--      this.constructor = d;
--    }
--
--    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
--  };
--}();
--
--var __read = this && this.__read || function (o, n) {
--  var m = typeof Symbol === "function" && o[Symbol.iterator];
--  if (!m) return o;
--  var i = m.call(o),
--      r,
--      ar = [],
--      e;
--
--  try {
--    while ((n === void 0 || n-- > 0) && !(r = i.next()).done) {
--      ar.push(r.value);
--    }
--  } catch (error) {
--    e = {
--      error: error
--    };
--  } finally {
--    try {
--      if (r && !r.done && (m = i["return"])) m.call(i);
--    } finally {
--      if (e) throw e.error;
--    }
--  }
--
--  return ar;
--};
--
--var __spreadArray = this && this.__spreadArray || function (to, from) {
--  for (var i = 0, il = from.length, j = to.length; i < il; i++, j++) {
--    to[j] = from[i];
--  }
--
--  return to;
--};
--
--var __values = this && this.__values || function (o) {
--  var s = typeof Symbol === "function" && Symbol.iterator,
--      m = s && o[s],
--      i = 0;
--  if (m) return m.call(o);
--  if (o && typeof o.length === "number") return {
--    next: function next() {
--      if (o && i >= o.length) o = void 0;
--      return {
--        value: o && o[i++],
--        done: !o
--      };
--    }
--  };
--  throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
--};
--
--var __importDefault = this && this.__importDefault || function (mod) {
--  return mod && mod.__esModule ? mod : {
--    "default": mod
--  };
--};
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.Socket = void 0;
--
--var eventemitter3_1 = require("eventemitter3");
--
--var logger_1 = __importDefault(require("./logger"));
--
--var enums_1 = require("./enums");
--/**
-- * An abstraction on top of WebSockets to provide fastest
-- * possible connection for peers.
-- */
--
--
--var Socket =
--/** @class */
--function (_super) {
--  __extends(Socket, _super);
--
--  function Socket(secure, host, port, path, key, pingInterval) {
--    if (pingInterval === void 0) {
--      pingInterval = 5000;
--    }
--
--    var _this = _super.call(this) || this;
--
--    _this.pingInterval = pingInterval;
--    _this._disconnected = true;
--    _this._messagesQueue = [];
--    var wsProtocol = secure ? "wss://" : "ws://";
--    _this._baseUrl = wsProtocol + host + ":" + port + path + "peerjs?key=" + key;
--    return _this;
--  }
--
--  Socket.prototype.start = function (id, token) {
--    var _this = this;
--
--    this._id = id;
--    var wsUrl = this._baseUrl + "&id=" + id + "&token=" + token;
--
--    if (!!this._socket || !this._disconnected) {
--      return;
--    }
--
--    this._socket = new WebSocket(wsUrl);
--    this._disconnected = false;
--
--    this._socket.onmessage = function (event) {
--      var data;
--
--      try {
--        data = JSON.parse(event.data);
--        logger_1.default.log("Server message received:", data);
--      } catch (e) {
--        logger_1.default.log("Invalid server message", event.data);
--        return;
--      }
--
--      _this.emit(enums_1.SocketEventType.Message, data);
--    };
--
--    this._socket.onclose = function (event) {
--      if (_this._disconnected) {
--        return;
--      }
--
--      logger_1.default.log("Socket closed.", event);
--
--      _this._cleanup();
--
--      _this._disconnected = true;
--
--      _this.emit(enums_1.SocketEventType.Disconnected);
--    }; // Take care of the queue of connections if necessary and make sure Peer knows
--    // socket is open.
--
--
--    this._socket.onopen = function () {
--      if (_this._disconnected) {
--        return;
--      }
--
--      _this._sendQueuedMessages();
--
--      logger_1.default.log("Socket open");
--
--      _this._scheduleHeartbeat();
--    };
--  };
--
--  Socket.prototype._scheduleHeartbeat = function () {
--    var _this = this;
--
--    this._wsPingTimer = setTimeout(function () {
--      _this._sendHeartbeat();
--    }, this.pingInterval);
--  };
--
--  Socket.prototype._sendHeartbeat = function () {
--    if (!this._wsOpen()) {
--      logger_1.default.log("Cannot send heartbeat, because socket closed");
--      return;
--    }
--
--    var message = JSON.stringify({
--      type: enums_1.ServerMessageType.Heartbeat
--    });
--
--    this._socket.send(message);
--
--    this._scheduleHeartbeat();
--  };
--  /** Is the websocket currently open? */
--
--
--  Socket.prototype._wsOpen = function () {
--    return !!this._socket && this._socket.readyState === 1;
--  };
--  /** Send queued messages. */
--
--
--  Socket.prototype._sendQueuedMessages = function () {
--    var e_1, _a; //Create copy of queue and clear it,
--    //because send method push the message back to queue if smth will go wrong
--
--
--    var copiedQueue = __spreadArray([], __read(this._messagesQueue));
--
--    this._messagesQueue = [];
--
--    try {
--      for (var copiedQueue_1 = __values(copiedQueue), copiedQueue_1_1 = copiedQueue_1.next(); !copiedQueue_1_1.done; copiedQueue_1_1 = copiedQueue_1.next()) {
--        var message = copiedQueue_1_1.value;
--        this.send(message);
--      }
--    } catch (e_1_1) {
--      e_1 = {
--        error: e_1_1
--      };
--    } finally {
--      try {
--        if (copiedQueue_1_1 && !copiedQueue_1_1.done && (_a = copiedQueue_1.return)) _a.call(copiedQueue_1);
--      } finally {
--        if (e_1) throw e_1.error;
--      }
--    }
--  };
--  /** Exposed send for DC & Peer. */
--
--
--  Socket.prototype.send = function (data) {
--    if (this._disconnected) {
--      return;
--    } // If we didn't get an ID yet, we can't yet send anything so we should queue
--    // up these messages.
--
--
--    if (!this._id) {
--      this._messagesQueue.push(data);
--
--      return;
--    }
--
--    if (!data.type) {
--      this.emit(enums_1.SocketEventType.Error, "Invalid message");
--      return;
--    }
--
--    if (!this._wsOpen()) {
--      return;
--    }
--
--    var message = JSON.stringify(data);
--
--    this._socket.send(message);
--  };
--
--  Socket.prototype.close = function () {
--    if (this._disconnected) {
--      return;
--    }
--
--    this._cleanup();
--
--    this._disconnected = true;
--  };
--
--  Socket.prototype._cleanup = function () {
--    if (this._socket) {
--      this._socket.onopen = this._socket.onmessage = this._socket.onclose = null;
--
--      this._socket.close();
--
--      this._socket = undefined;
--    }
--
--    clearTimeout(this._wsPingTimer);
--  };
--
--  return Socket;
--}(eventemitter3_1.EventEmitter);
--
--exports.Socket = Socket;
--},{"eventemitter3":"JJlS","./logger":"WOs9","./enums":"ZRYf"}],"HCdX":[function(require,module,exports) {
--"use strict";
--
--var __assign = this && this.__assign || function () {
--  __assign = Object.assign || function (t) {
--    for (var s, i = 1, n = arguments.length; i < n; i++) {
--      s = arguments[i];
--
--      for (var p in s) {
--        if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
--      }
--    }
--
--    return t;
--  };
--
--  return __assign.apply(this, arguments);
--};
--
--var __awaiter = this && this.__awaiter || function (thisArg, _arguments, P, generator) {
--  function adopt(value) {
--    return value instanceof P ? value : new P(function (resolve) {
--      resolve(value);
--    });
--  }
--
--  return new (P || (P = Promise))(function (resolve, reject) {
--    function fulfilled(value) {
--      try {
--        step(generator.next(value));
--      } catch (e) {
--        reject(e);
--      }
--    }
--
--    function rejected(value) {
--      try {
--        step(generator["throw"](value));
--      } catch (e) {
--        reject(e);
--      }
--    }
--
--    function step(result) {
--      result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected);
--    }
--
--    step((generator = generator.apply(thisArg, _arguments || [])).next());
--  });
--};
--
--var __generator = this && this.__generator || function (thisArg, body) {
--  var _ = {
--    label: 0,
--    sent: function sent() {
--      if (t[0] & 1) throw t[1];
--      return t[1];
--    },
--    trys: [],
--    ops: []
--  },
--      f,
--      y,
--      t,
--      g;
--  return g = {
--    next: verb(0),
--    "throw": verb(1),
--    "return": verb(2)
--  }, typeof Symbol === "function" && (g[Symbol.iterator] = function () {
--    return this;
--  }), g;
--
--  function verb(n) {
--    return function (v) {
--      return step([n, v]);
--    };
--  }
--
--  function step(op) {
--    if (f) throw new TypeError("Generator is already executing.");
--
--    while (_) {
--      try {
--        if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
--        if (y = 0, t) op = [op[0] & 2, t.value];
--
--        switch (op[0]) {
--          case 0:
--          case 1:
--            t = op;
--            break;
--
--          case 4:
--            _.label++;
--            return {
--              value: op[1],
--              done: false
--            };
--
--          case 5:
--            _.label++;
--            y = op[1];
--            op = [0];
--            continue;
--
--          case 7:
--            op = _.ops.pop();
--
--            _.trys.pop();
--
--            continue;
--
--          default:
--            if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) {
--              _ = 0;
--              continue;
--            }
--
--            if (op[0] === 3 && (!t || op[1] > t[0] && op[1] < t[3])) {
--              _.label = op[1];
--              break;
--            }
--
--            if (op[0] === 6 && _.label < t[1]) {
--              _.label = t[1];
--              t = op;
--              break;
--            }
--
--            if (t && _.label < t[2]) {
--              _.label = t[2];
--
--              _.ops.push(op);
--
--              break;
--            }
--
--            if (t[2]) _.ops.pop();
--
--            _.trys.pop();
--
--            continue;
--        }
--
--        op = body.call(thisArg, _);
--      } catch (e) {
--        op = [6, e];
--        y = 0;
--      } finally {
--        f = t = 0;
--      }
--    }
--
--    if (op[0] & 5) throw op[1];
--    return {
--      value: op[0] ? op[1] : void 0,
--      done: true
--    };
--  }
--};
--
--var __importDefault = this && this.__importDefault || function (mod) {
--  return mod && mod.__esModule ? mod : {
--    "default": mod
--  };
--};
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.Negotiator = void 0;
--
--var util_1 = require("./util");
--
--var logger_1 = __importDefault(require("./logger"));
--
--var enums_1 = require("./enums");
--/**
-- * Manages all negotiations between Peers.
-- */
--
--
--var Negotiator =
--/** @class */
--function () {
--  function Negotiator(connection) {
--    this.connection = connection;
--  }
--  /** Returns a PeerConnection object set up correctly (for data, media). */
--
--
--  Negotiator.prototype.startConnection = function (options) {
--    var peerConnection = this._startPeerConnection(); // Set the connection's PC.
--
--
--    this.connection.peerConnection = peerConnection;
--
--    if (this.connection.type === enums_1.ConnectionType.Media && options._stream) {
--      this._addTracksToConnection(options._stream, peerConnection);
--    } // What do we need to do now?
--
--
--    if (options.originator) {
--      if (this.connection.type === enums_1.ConnectionType.Data) {
--        var dataConnection = this.connection;
--        var config = {
--          ordered: !!options.reliable
--        };
--        var dataChannel = peerConnection.createDataChannel(dataConnection.label, config);
--        dataConnection.initialize(dataChannel);
--      }
--
--      this._makeOffer();
--    } else {
--      this.handleSDP("OFFER", options.sdp);
--    }
--  };
--  /** Start a PC. */
--
--
--  Negotiator.prototype._startPeerConnection = function () {
--    logger_1.default.log("Creating RTCPeerConnection.");
--    var peerConnection = new RTCPeerConnection(this.connection.provider.options.config);
--
--    this._setupListeners(peerConnection);
--
--    return peerConnection;
--  };
--  /** Set up various WebRTC listeners. */
--
--
--  Negotiator.prototype._setupListeners = function (peerConnection) {
--    var _this = this;
--
--    var peerId = this.connection.peer;
--    var connectionId = this.connection.connectionId;
--    var connectionType = this.connection.type;
--    var provider = this.connection.provider; // ICE CANDIDATES.
--
--    logger_1.default.log("Listening for ICE candidates.");
--
--    peerConnection.onicecandidate = function (evt) {
--      if (!evt.candidate || !evt.candidate.candidate) return;
--      logger_1.default.log("Received ICE candidates for " + peerId + ":", evt.candidate);
--      provider.socket.send({
--        type: enums_1.ServerMessageType.Candidate,
--        payload: {
--          candidate: evt.candidate,
--          type: connectionType,
--          connectionId: connectionId
--        },
--        dst: peerId
--      });
--    };
--
--    peerConnection.oniceconnectionstatechange = function () {
--      switch (peerConnection.iceConnectionState) {
--        case "failed":
--          logger_1.default.log("iceConnectionState is failed, closing connections to " + peerId);
--
--          _this.connection.emit(enums_1.ConnectionEventType.Error, new Error("Negotiation of connection to " + peerId + " failed."));
--
--          _this.connection.close();
--
--          break;
--
--        case "closed":
--          logger_1.default.log("iceConnectionState is closed, closing connections to " + peerId);
--
--          _this.connection.emit(enums_1.ConnectionEventType.Error, new Error("Connection to " + peerId + " closed."));
--
--          _this.connection.close();
--
--          break;
--
--        case "disconnected":
--          logger_1.default.log("iceConnectionState changed to disconnected on the connection with " + peerId);
--          break;
--
--        case "completed":
--          peerConnection.onicecandidate = util_1.util.noop;
--          break;
--      }
--
--      _this.connection.emit(enums_1.ConnectionEventType.IceStateChanged, peerConnection.iceConnectionState);
--    }; // DATACONNECTION.
--
--
--    logger_1.default.log("Listening for data channel"); // Fired between offer and answer, so options should already be saved
--    // in the options hash.
--
--    peerConnection.ondatachannel = function (evt) {
--      logger_1.default.log("Received data channel");
--      var dataChannel = evt.channel;
--      var connection = provider.getConnection(peerId, connectionId);
--      connection.initialize(dataChannel);
--    }; // MEDIACONNECTION.
--
--
--    logger_1.default.log("Listening for remote stream");
--
--    peerConnection.ontrack = function (evt) {
--      logger_1.default.log("Received remote stream");
--      var stream = evt.streams[0];
--      var connection = provider.getConnection(peerId, connectionId);
--
--      if (connection.type === enums_1.ConnectionType.Media) {
--        var mediaConnection = connection;
--
--        _this._addStreamToMediaConnection(stream, mediaConnection);
--      }
--    };
--  };
--
--  Negotiator.prototype.cleanup = function () {
--    logger_1.default.log("Cleaning up PeerConnection to " + this.connection.peer);
--    var peerConnection = this.connection.peerConnection;
--
--    if (!peerConnection) {
--      return;
--    }
--
--    this.connection.peerConnection = null; //unsubscribe from all PeerConnection's events
--
--    peerConnection.onicecandidate = peerConnection.oniceconnectionstatechange = peerConnection.ondatachannel = peerConnection.ontrack = function () {};
--
--    var peerConnectionNotClosed = peerConnection.signalingState !== "closed";
--    var dataChannelNotClosed = false;
--
--    if (this.connection.type === enums_1.ConnectionType.Data) {
--      var dataConnection = this.connection;
--      var dataChannel = dataConnection.dataChannel;
--
--      if (dataChannel) {
--        dataChannelNotClosed = !!dataChannel.readyState && dataChannel.readyState !== "closed";
--      }
--    }
--
--    if (peerConnectionNotClosed || dataChannelNotClosed) {
--      peerConnection.close();
--    }
--  };
--
--  Negotiator.prototype._makeOffer = function () {
--    return __awaiter(this, void 0, Promise, function () {
--      var peerConnection, provider, offer, payload, dataConnection, err_2, err_1_1;
--      return __generator(this, function (_a) {
--        switch (_a.label) {
--          case 0:
--            peerConnection = this.connection.peerConnection;
--            provider = this.connection.provider;
--            _a.label = 1;
--
--          case 1:
--            _a.trys.push([1, 7,, 8]);
--
--            return [4
--            /*yield*/
--            , peerConnection.createOffer(this.connection.options.constraints)];
--
--          case 2:
--            offer = _a.sent();
--            logger_1.default.log("Created offer.");
--
--            if (this.connection.options.sdpTransform && typeof this.connection.options.sdpTransform === 'function') {
--              offer.sdp = this.connection.options.sdpTransform(offer.sdp) || offer.sdp;
--            }
--
--            _a.label = 3;
--
--          case 3:
--            _a.trys.push([3, 5,, 6]);
--
--            return [4
--            /*yield*/
--            , peerConnection.setLocalDescription(offer)];
--
--          case 4:
--            _a.sent();
--
--            logger_1.default.log("Set localDescription:", offer, "for:" + this.connection.peer);
--            payload = {
--              sdp: offer,
--              type: this.connection.type,
--              connectionId: this.connection.connectionId,
--              metadata: this.connection.metadata,
--              browser: util_1.util.browser
--            };
--
--            if (this.connection.type === enums_1.ConnectionType.Data) {
--              dataConnection = this.connection;
--              payload = __assign(__assign({}, payload), {
--                label: dataConnection.label,
--                reliable: dataConnection.reliable,
--                serialization: dataConnection.serialization
--              });
--            }
--
--            provider.socket.send({
--              type: enums_1.ServerMessageType.Offer,
--              payload: payload,
--              dst: this.connection.peer
--            });
--            return [3
--            /*break*/
--            , 6];
--
--          case 5:
--            err_2 = _a.sent(); // TODO: investigate why _makeOffer is being called from the answer
--
--            if (err_2 != "OperationError: Failed to set local offer sdp: Called in wrong state: kHaveRemoteOffer") {
--              provider.emitError(enums_1.PeerErrorType.WebRTC, err_2);
--              logger_1.default.log("Failed to setLocalDescription, ", err_2);
--            }
--
--            return [3
--            /*break*/
--            , 6];
--
--          case 6:
--            return [3
--            /*break*/
--            , 8];
--
--          case 7:
--            err_1_1 = _a.sent();
--            provider.emitError(enums_1.PeerErrorType.WebRTC, err_1_1);
--            logger_1.default.log("Failed to createOffer, ", err_1_1);
--            return [3
--            /*break*/
--            , 8];
--
--          case 8:
--            return [2
--            /*return*/
--            ];
--        }
--      });
--    });
--  };
--
--  Negotiator.prototype._makeAnswer = function () {
--    return __awaiter(this, void 0, Promise, function () {
--      var peerConnection, provider, answer, err_3, err_1_2;
--      return __generator(this, function (_a) {
--        switch (_a.label) {
--          case 0:
--            peerConnection = this.connection.peerConnection;
--            provider = this.connection.provider;
--            _a.label = 1;
--
--          case 1:
--            _a.trys.push([1, 7,, 8]);
--
--            return [4
--            /*yield*/
--            , peerConnection.createAnswer()];
--
--          case 2:
--            answer = _a.sent();
--            logger_1.default.log("Created answer.");
--
--            if (this.connection.options.sdpTransform && typeof this.connection.options.sdpTransform === 'function') {
--              answer.sdp = this.connection.options.sdpTransform(answer.sdp) || answer.sdp;
--            }
--
--            _a.label = 3;
--
--          case 3:
--            _a.trys.push([3, 5,, 6]);
--
--            return [4
--            /*yield*/
--            , peerConnection.setLocalDescription(answer)];
--
--          case 4:
--            _a.sent();
--
--            logger_1.default.log("Set localDescription:", answer, "for:" + this.connection.peer);
--            provider.socket.send({
--              type: enums_1.ServerMessageType.Answer,
--              payload: {
--                sdp: answer,
--                type: this.connection.type,
--                connectionId: this.connection.connectionId,
--                browser: util_1.util.browser
--              },
--              dst: this.connection.peer
--            });
--            return [3
--            /*break*/
--            , 6];
--
--          case 5:
--            err_3 = _a.sent();
--            provider.emitError(enums_1.PeerErrorType.WebRTC, err_3);
--            logger_1.default.log("Failed to setLocalDescription, ", err_3);
--            return [3
--            /*break*/
--            , 6];
--
--          case 6:
--            return [3
--            /*break*/
--            , 8];
--
--          case 7:
--            err_1_2 = _a.sent();
--            provider.emitError(enums_1.PeerErrorType.WebRTC, err_1_2);
--            logger_1.default.log("Failed to create answer, ", err_1_2);
--            return [3
--            /*break*/
--            , 8];
--
--          case 8:
--            return [2
--            /*return*/
--            ];
--        }
--      });
--    });
--  };
--  /** Handle an SDP. */
--
--
--  Negotiator.prototype.handleSDP = function (type, sdp) {
--    return __awaiter(this, void 0, Promise, function () {
--      var peerConnection, provider, self, err_4;
--      return __generator(this, function (_a) {
--        switch (_a.label) {
--          case 0:
--            sdp = new RTCSessionDescription(sdp);
--            peerConnection = this.connection.peerConnection;
--            provider = this.connection.provider;
--            logger_1.default.log("Setting remote description", sdp);
--            self = this;
--            _a.label = 1;
--
--          case 1:
--            _a.trys.push([1, 5,, 6]);
--
--            return [4
--            /*yield*/
--            , peerConnection.setRemoteDescription(sdp)];
--
--          case 2:
--            _a.sent();
--
--            logger_1.default.log("Set remoteDescription:" + type + " for:" + this.connection.peer);
--            if (!(type === "OFFER")) return [3
--            /*break*/
--            , 4];
--            return [4
--            /*yield*/
--            , self._makeAnswer()];
--
--          case 3:
--            _a.sent();
--
--            _a.label = 4;
--
--          case 4:
--            return [3
--            /*break*/
--            , 6];
--
--          case 5:
--            err_4 = _a.sent();
--            provider.emitError(enums_1.PeerErrorType.WebRTC, err_4);
--            logger_1.default.log("Failed to setRemoteDescription, ", err_4);
--            return [3
--            /*break*/
--            , 6];
--
--          case 6:
--            return [2
--            /*return*/
--            ];
--        }
--      });
--    });
--  };
--  /** Handle a candidate. */
--
--
--  Negotiator.prototype.handleCandidate = function (ice) {
--    return __awaiter(this, void 0, Promise, function () {
--      var candidate, sdpMLineIndex, sdpMid, peerConnection, provider, err_5;
--      return __generator(this, function (_a) {
--        switch (_a.label) {
--          case 0:
--            logger_1.default.log("handleCandidate:", ice);
--            candidate = ice.candidate;
--            sdpMLineIndex = ice.sdpMLineIndex;
--            sdpMid = ice.sdpMid;
--            peerConnection = this.connection.peerConnection;
--            provider = this.connection.provider;
--            _a.label = 1;
--
--          case 1:
--            _a.trys.push([1, 3,, 4]);
--
--            return [4
--            /*yield*/
--            , peerConnection.addIceCandidate(new RTCIceCandidate({
--              sdpMid: sdpMid,
--              sdpMLineIndex: sdpMLineIndex,
--              candidate: candidate
--            }))];
--
--          case 2:
--            _a.sent();
--
--            logger_1.default.log("Added ICE candidate for:" + this.connection.peer);
--            return [3
--            /*break*/
--            , 4];
--
--          case 3:
--            err_5 = _a.sent();
--            provider.emitError(enums_1.PeerErrorType.WebRTC, err_5);
--            logger_1.default.log("Failed to handleCandidate, ", err_5);
--            return [3
--            /*break*/
--            , 4];
--
--          case 4:
--            return [2
--            /*return*/
--            ];
--        }
--      });
--    });
--  };
--
--  Negotiator.prototype._addTracksToConnection = function (stream, peerConnection) {
--    logger_1.default.log("add tracks from stream " + stream.id + " to peer connection");
--
--    if (!peerConnection.addTrack) {
--      return logger_1.default.error("Your browser does't support RTCPeerConnection#addTrack. Ignored.");
--    }
--
--    stream.getTracks().forEach(function (track) {
--      peerConnection.addTrack(track, stream);
--    });
--  };
--
--  Negotiator.prototype._addStreamToMediaConnection = function (stream, mediaConnection) {
--    logger_1.default.log("add stream " + stream.id + " to media connection " + mediaConnection.connectionId);
--    mediaConnection.addStream(stream);
--  };
--
--  return Negotiator;
--}();
--
--exports.Negotiator = Negotiator;
--},{"./util":"BHXf","./logger":"WOs9","./enums":"ZRYf"}],"tQFK":[function(require,module,exports) {
--"use strict";
--
--var __extends = this && this.__extends || function () {
--  var _extendStatics = function extendStatics(d, b) {
--    _extendStatics = Object.setPrototypeOf || {
--      __proto__: []
--    } instanceof Array && function (d, b) {
--      d.__proto__ = b;
--    } || function (d, b) {
--      for (var p in b) {
--        if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p];
--      }
--    };
--
--    return _extendStatics(d, b);
--  };
--
--  return function (d, b) {
--    if (typeof b !== "function" && b !== null) throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
--
--    _extendStatics(d, b);
--
--    function __() {
--      this.constructor = d;
--    }
--
--    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
--  };
--}();
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.BaseConnection = void 0;
--
--var eventemitter3_1 = require("eventemitter3");
--
--var BaseConnection =
--/** @class */
--function (_super) {
--  __extends(BaseConnection, _super);
--
--  function BaseConnection(peer, provider, options) {
--    var _this = _super.call(this) || this;
--
--    _this.peer = peer;
--    _this.provider = provider;
--    _this.options = options;
--    _this._open = false;
--    _this.metadata = options.metadata;
--    return _this;
--  }
--
--  Object.defineProperty(BaseConnection.prototype, "open", {
--    get: function get() {
--      return this._open;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  return BaseConnection;
--}(eventemitter3_1.EventEmitter);
--
--exports.BaseConnection = BaseConnection;
--},{"eventemitter3":"JJlS"}],"dbHP":[function(require,module,exports) {
--"use strict";
--
--var __extends = this && this.__extends || function () {
--  var _extendStatics = function extendStatics(d, b) {
--    _extendStatics = Object.setPrototypeOf || {
--      __proto__: []
--    } instanceof Array && function (d, b) {
--      d.__proto__ = b;
--    } || function (d, b) {
--      for (var p in b) {
--        if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p];
--      }
--    };
--
--    return _extendStatics(d, b);
--  };
--
--  return function (d, b) {
--    if (typeof b !== "function" && b !== null) throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
--
--    _extendStatics(d, b);
--
--    function __() {
--      this.constructor = d;
--    }
--
--    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
--  };
--}();
--
--var __assign = this && this.__assign || function () {
--  __assign = Object.assign || function (t) {
--    for (var s, i = 1, n = arguments.length; i < n; i++) {
--      s = arguments[i];
--
--      for (var p in s) {
--        if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
--      }
--    }
--
--    return t;
--  };
--
--  return __assign.apply(this, arguments);
--};
--
--var __values = this && this.__values || function (o) {
--  var s = typeof Symbol === "function" && Symbol.iterator,
--      m = s && o[s],
--      i = 0;
--  if (m) return m.call(o);
--  if (o && typeof o.length === "number") return {
--    next: function next() {
--      if (o && i >= o.length) o = void 0;
--      return {
--        value: o && o[i++],
--        done: !o
--      };
--    }
--  };
--  throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
--};
--
--var __importDefault = this && this.__importDefault || function (mod) {
--  return mod && mod.__esModule ? mod : {
--    "default": mod
--  };
--};
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.MediaConnection = void 0;
--
--var util_1 = require("./util");
--
--var logger_1 = __importDefault(require("./logger"));
--
--var negotiator_1 = require("./negotiator");
--
--var enums_1 = require("./enums");
--
--var baseconnection_1 = require("./baseconnection");
--/**
-- * Wraps the streaming interface between two Peers.
-- */
--
--
--var MediaConnection =
--/** @class */
--function (_super) {
--  __extends(MediaConnection, _super);
--
--  function MediaConnection(peerId, provider, options) {
--    var _this = _super.call(this, peerId, provider, options) || this;
--
--    _this._localStream = _this.options._stream;
--    _this.connectionId = _this.options.connectionId || MediaConnection.ID_PREFIX + util_1.util.randomToken();
--    _this._negotiator = new negotiator_1.Negotiator(_this);
--
--    if (_this._localStream) {
--      _this._negotiator.startConnection({
--        _stream: _this._localStream,
--        originator: true
--      });
--    }
--
--    return _this;
--  }
--
--  Object.defineProperty(MediaConnection.prototype, "type", {
--    get: function get() {
--      return enums_1.ConnectionType.Media;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(MediaConnection.prototype, "localStream", {
--    get: function get() {
--      return this._localStream;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(MediaConnection.prototype, "remoteStream", {
--    get: function get() {
--      return this._remoteStream;
--    },
--    enumerable: false,
--    configurable: true
--  });
--
--  MediaConnection.prototype.addStream = function (remoteStream) {
--    logger_1.default.log("Receiving stream", remoteStream);
--    this._remoteStream = remoteStream;
--
--    _super.prototype.emit.call(this, enums_1.ConnectionEventType.Stream, remoteStream); // Should we call this `open`?
--
--  };
--
--  MediaConnection.prototype.handleMessage = function (message) {
--    var type = message.type;
--    var payload = message.payload;
--
--    switch (message.type) {
--      case enums_1.ServerMessageType.Answer:
--        // Forward to negotiator
--        this._negotiator.handleSDP(type, payload.sdp);
--
--        this._open = true;
--        break;
--
--      case enums_1.ServerMessageType.Candidate:
--        this._negotiator.handleCandidate(payload.candidate);
--
--        break;
--
--      default:
--        logger_1.default.warn("Unrecognized message type:" + type + " from peer:" + this.peer);
--        break;
--    }
--  };
--
--  MediaConnection.prototype.answer = function (stream, options) {
--    var e_1, _a;
--
--    if (options === void 0) {
--      options = {};
--    }
--
--    if (this._localStream) {
--      logger_1.default.warn("Local stream already exists on this MediaConnection. Are you answering a call twice?");
--      return;
--    }
--
--    this._localStream = stream;
--
--    if (options && options.sdpTransform) {
--      this.options.sdpTransform = options.sdpTransform;
--    }
--
--    this._negotiator.startConnection(__assign(__assign({}, this.options._payload), {
--      _stream: stream
--    })); // Retrieve lost messages stored because PeerConnection not set up.
--
--
--    var messages = this.provider._getMessages(this.connectionId);
--
--    try {
--      for (var messages_1 = __values(messages), messages_1_1 = messages_1.next(); !messages_1_1.done; messages_1_1 = messages_1.next()) {
--        var message = messages_1_1.value;
--        this.handleMessage(message);
--      }
--    } catch (e_1_1) {
--      e_1 = {
--        error: e_1_1
--      };
--    } finally {
--      try {
--        if (messages_1_1 && !messages_1_1.done && (_a = messages_1.return)) _a.call(messages_1);
--      } finally {
--        if (e_1) throw e_1.error;
--      }
--    }
--
--    this._open = true;
--  };
--  /**
--   * Exposed functionality for users.
--   */
--
--  /** Allows user to close connection. */
--
--
--  MediaConnection.prototype.close = function () {
--    if (this._negotiator) {
--      this._negotiator.cleanup();
--
--      this._negotiator = null;
--    }
--
--    this._localStream = null;
--    this._remoteStream = null;
--
--    if (this.provider) {
--      this.provider._removeConnection(this);
--
--      this.provider = null;
--    }
--
--    if (this.options && this.options._stream) {
--      this.options._stream = null;
--    }
--
--    if (!this.open) {
--      return;
--    }
--
--    this._open = false;
--
--    _super.prototype.emit.call(this, enums_1.ConnectionEventType.Close);
--  };
--
--  MediaConnection.ID_PREFIX = "mc_";
--  return MediaConnection;
--}(baseconnection_1.BaseConnection);
--
--exports.MediaConnection = MediaConnection;
--},{"./util":"BHXf","./logger":"WOs9","./negotiator":"HCdX","./enums":"ZRYf","./baseconnection":"tQFK"}],"GGp6":[function(require,module,exports) {
--"use strict";
--
--var __extends = this && this.__extends || function () {
--  var _extendStatics = function extendStatics(d, b) {
--    _extendStatics = Object.setPrototypeOf || {
--      __proto__: []
--    } instanceof Array && function (d, b) {
--      d.__proto__ = b;
--    } || function (d, b) {
--      for (var p in b) {
--        if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p];
--      }
--    };
--
--    return _extendStatics(d, b);
--  };
--
--  return function (d, b) {
--    if (typeof b !== "function" && b !== null) throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
--
--    _extendStatics(d, b);
--
--    function __() {
--      this.constructor = d;
--    }
--
--    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
--  };
--}();
--
--var __importDefault = this && this.__importDefault || function (mod) {
--  return mod && mod.__esModule ? mod : {
--    "default": mod
--  };
--};
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.EncodingQueue = void 0;
--
--var eventemitter3_1 = require("eventemitter3");
--
--var logger_1 = __importDefault(require("./logger"));
--
--var EncodingQueue =
--/** @class */
--function (_super) {
--  __extends(EncodingQueue, _super);
--
--  function EncodingQueue() {
--    var _this = _super.call(this) || this;
--
--    _this.fileReader = new FileReader();
--    _this._queue = [];
--    _this._processing = false;
--
--    _this.fileReader.onload = function (evt) {
--      _this._processing = false;
--
--      if (evt.target) {
--        _this.emit('done', evt.target.result);
--      }
--
--      _this.doNextTask();
--    };
--
--    _this.fileReader.onerror = function (evt) {
--      logger_1.default.error("EncodingQueue error:", evt);
--      _this._processing = false;
--
--      _this.destroy();
--
--      _this.emit('error', evt);
--    };
--
--    return _this;
--  }
--
--  Object.defineProperty(EncodingQueue.prototype, "queue", {
--    get: function get() {
--      return this._queue;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(EncodingQueue.prototype, "size", {
--    get: function get() {
--      return this.queue.length;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(EncodingQueue.prototype, "processing", {
--    get: function get() {
--      return this._processing;
--    },
--    enumerable: false,
--    configurable: true
--  });
--
--  EncodingQueue.prototype.enque = function (blob) {
--    this.queue.push(blob);
--    if (this.processing) return;
--    this.doNextTask();
--  };
--
--  EncodingQueue.prototype.destroy = function () {
--    this.fileReader.abort();
--    this._queue = [];
--  };
--
--  EncodingQueue.prototype.doNextTask = function () {
--    if (this.size === 0) return;
--    if (this.processing) return;
--    this._processing = true;
--    this.fileReader.readAsArrayBuffer(this.queue.shift());
--  };
--
--  return EncodingQueue;
--}(eventemitter3_1.EventEmitter);
--
--exports.EncodingQueue = EncodingQueue;
--},{"eventemitter3":"JJlS","./logger":"WOs9"}],"GBTQ":[function(require,module,exports) {
--"use strict";
--
--var __extends = this && this.__extends || function () {
--  var _extendStatics = function extendStatics(d, b) {
--    _extendStatics = Object.setPrototypeOf || {
--      __proto__: []
--    } instanceof Array && function (d, b) {
--      d.__proto__ = b;
--    } || function (d, b) {
--      for (var p in b) {
--        if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p];
--      }
--    };
--
--    return _extendStatics(d, b);
--  };
--
--  return function (d, b) {
--    if (typeof b !== "function" && b !== null) throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
--
--    _extendStatics(d, b);
--
--    function __() {
--      this.constructor = d;
--    }
--
--    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
--  };
--}();
--
--var __values = this && this.__values || function (o) {
--  var s = typeof Symbol === "function" && Symbol.iterator,
--      m = s && o[s],
--      i = 0;
--  if (m) return m.call(o);
--  if (o && typeof o.length === "number") return {
--    next: function next() {
--      if (o && i >= o.length) o = void 0;
--      return {
--        value: o && o[i++],
--        done: !o
--      };
--    }
--  };
--  throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
--};
--
--var __importDefault = this && this.__importDefault || function (mod) {
--  return mod && mod.__esModule ? mod : {
--    "default": mod
--  };
--};
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.DataConnection = void 0;
--
--var util_1 = require("./util");
--
--var logger_1 = __importDefault(require("./logger"));
--
--var negotiator_1 = require("./negotiator");
--
--var enums_1 = require("./enums");
--
--var baseconnection_1 = require("./baseconnection");
--
--var encodingQueue_1 = require("./encodingQueue");
--/**
-- * Wraps a DataChannel between two Peers.
-- */
--
--
--var DataConnection =
--/** @class */
--function (_super) {
--  __extends(DataConnection, _super);
--
--  function DataConnection(peerId, provider, options) {
--    var _this = _super.call(this, peerId, provider, options) || this;
--
--    _this.stringify = JSON.stringify;
--    _this.parse = JSON.parse;
--    _this._buffer = [];
--    _this._bufferSize = 0;
--    _this._buffering = false;
--    _this._chunkedData = {};
--    _this._encodingQueue = new encodingQueue_1.EncodingQueue();
--    _this.connectionId = _this.options.connectionId || DataConnection.ID_PREFIX + util_1.util.randomToken();
--    _this.label = _this.options.label || _this.connectionId;
--    _this.serialization = _this.options.serialization || enums_1.SerializationType.Binary;
--    _this.reliable = !!_this.options.reliable;
--
--    _this._encodingQueue.on('done', function (ab) {
--      _this._bufferedSend(ab);
--    });
--
--    _this._encodingQueue.on('error', function () {
--      logger_1.default.error("DC#" + _this.connectionId + ": Error occured in encoding from blob to arraybuffer, close DC");
--
--      _this.close();
--    });
--
--    _this._negotiator = new negotiator_1.Negotiator(_this);
--
--    _this._negotiator.startConnection(_this.options._payload || {
--      originator: true
--    });
--
--    return _this;
--  }
--
--  Object.defineProperty(DataConnection.prototype, "type", {
--    get: function get() {
--      return enums_1.ConnectionType.Data;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(DataConnection.prototype, "dataChannel", {
--    get: function get() {
--      return this._dc;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(DataConnection.prototype, "bufferSize", {
--    get: function get() {
--      return this._bufferSize;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  /** Called by the Negotiator when the DataChannel is ready. */
--
--  DataConnection.prototype.initialize = function (dc) {
--    this._dc = dc;
--
--    this._configureDataChannel();
--  };
--
--  DataConnection.prototype._configureDataChannel = function () {
--    var _this = this;
--
--    if (!util_1.util.supports.binaryBlob || util_1.util.supports.reliable) {
--      this.dataChannel.binaryType = "arraybuffer";
--    }
--
--    this.dataChannel.onopen = function () {
--      logger_1.default.log("DC#" + _this.connectionId + " dc connection success");
--      _this._open = true;
--
--      _this.emit(enums_1.ConnectionEventType.Open);
--    };
--
--    this.dataChannel.onmessage = function (e) {
--      logger_1.default.log("DC#" + _this.connectionId + " dc onmessage:", e.data);
--
--      _this._handleDataMessage(e);
--    };
--
--    this.dataChannel.onclose = function () {
--      logger_1.default.log("DC#" + _this.connectionId + " dc closed for:", _this.peer);
--
--      _this.close();
--    };
--  }; // Handles a DataChannel message.
--
--
--  DataConnection.prototype._handleDataMessage = function (_a) {
--    var _this = this;
--
--    var data = _a.data;
--    var datatype = data.constructor;
--    var isBinarySerialization = this.serialization === enums_1.SerializationType.Binary || this.serialization === enums_1.SerializationType.BinaryUTF8;
--    var deserializedData = data;
--
--    if (isBinarySerialization) {
--      if (datatype === Blob) {
--        // Datatype should never be blob
--        util_1.util.blobToArrayBuffer(data, function (ab) {
--          var unpackedData = util_1.util.unpack(ab);
--
--          _this.emit(enums_1.ConnectionEventType.Data, unpackedData);
--        });
--        return;
--      } else if (datatype === ArrayBuffer) {
--        deserializedData = util_1.util.unpack(data);
--      } else if (datatype === String) {
--        // String fallback for binary data for browsers that don't support binary yet
--        var ab = util_1.util.binaryStringToArrayBuffer(data);
--        deserializedData = util_1.util.unpack(ab);
--      }
--    } else if (this.serialization === enums_1.SerializationType.JSON) {
--      deserializedData = this.parse(data);
--    } // Check if we've chunked--if so, piece things back together.
--    // We're guaranteed that this isn't 0.
--
--
--    if (deserializedData.__peerData) {
--      this._handleChunk(deserializedData);
--
--      return;
--    }
--
--    _super.prototype.emit.call(this, enums_1.ConnectionEventType.Data, deserializedData);
--  };
--
--  DataConnection.prototype._handleChunk = function (data) {
--    var id = data.__peerData;
--    var chunkInfo = this._chunkedData[id] || {
--      data: [],
--      count: 0,
--      total: data.total
--    };
--    chunkInfo.data[data.n] = data.data;
--    chunkInfo.count++;
--    this._chunkedData[id] = chunkInfo;
--
--    if (chunkInfo.total === chunkInfo.count) {
--      // Clean up before making the recursive call to `_handleDataMessage`.
--      delete this._chunkedData[id]; // We've received all the chunks--time to construct the complete data.
--
--      var data_1 = new Blob(chunkInfo.data);
--
--      this._handleDataMessage({
--        data: data_1
--      });
--    }
--  };
--  /**
--   * Exposed functionality for users.
--   */
--
--  /** Allows user to close connection. */
--
--
--  DataConnection.prototype.close = function () {
--    this._buffer = [];
--    this._bufferSize = 0;
--    this._chunkedData = {};
--
--    if (this._negotiator) {
--      this._negotiator.cleanup();
--
--      this._negotiator = null;
--    }
--
--    if (this.provider) {
--      this.provider._removeConnection(this);
--
--      this.provider = null;
--    }
--
--    if (this.dataChannel) {
--      this.dataChannel.onopen = null;
--      this.dataChannel.onmessage = null;
--      this.dataChannel.onclose = null;
--      this._dc = null;
--    }
--
--    if (this._encodingQueue) {
--      this._encodingQueue.destroy();
--
--      this._encodingQueue.removeAllListeners();
--
--      this._encodingQueue = null;
--    }
--
--    if (!this.open) {
--      return;
--    }
--
--    this._open = false;
--
--    _super.prototype.emit.call(this, enums_1.ConnectionEventType.Close);
--  };
--  /** Allows user to send data. */
--
--
--  DataConnection.prototype.send = function (data, chunked) {
--    if (!this.open) {
--      _super.prototype.emit.call(this, enums_1.ConnectionEventType.Error, new Error("Connection is not open. You should listen for the `open` event before sending messages."));
--
--      return;
--    }
--
--    if (this.serialization === enums_1.SerializationType.JSON) {
--      this._bufferedSend(this.stringify(data));
--    } else if (this.serialization === enums_1.SerializationType.Binary || this.serialization === enums_1.SerializationType.BinaryUTF8) {
--      var blob = util_1.util.pack(data);
--
--      if (!chunked && blob.size > util_1.util.chunkedMTU) {
--        this._sendChunks(blob);
--
--        return;
--      }
--
--      if (!util_1.util.supports.binaryBlob) {
--        // We only do this if we really need to (e.g. blobs are not supported),
--        // because this conversion is costly.
--        this._encodingQueue.enque(blob);
--      } else {
--        this._bufferedSend(blob);
--      }
--    } else {
--      this._bufferedSend(data);
--    }
--  };
--
--  DataConnection.prototype._bufferedSend = function (msg) {
--    if (this._buffering || !this._trySend(msg)) {
--      this._buffer.push(msg);
--
--      this._bufferSize = this._buffer.length;
--    }
--  }; // Returns true if the send succeeds.
--
--
--  DataConnection.prototype._trySend = function (msg) {
--    var _this = this;
--
--    if (!this.open) {
--      return false;
--    }
--
--    if (this.dataChannel.bufferedAmount > DataConnection.MAX_BUFFERED_AMOUNT) {
--      this._buffering = true;
--      setTimeout(function () {
--        _this._buffering = false;
--
--        _this._tryBuffer();
--      }, 50);
--      return false;
--    }
--
--    try {
--      this.dataChannel.send(msg);
--    } catch (e) {
--      logger_1.default.error("DC#:" + this.connectionId + " Error when sending:", e);
--      this._buffering = true;
--      this.close();
--      return false;
--    }
--
--    return true;
--  }; // Try to send the first message in the buffer.
--
--
--  DataConnection.prototype._tryBuffer = function () {
--    if (!this.open) {
--      return;
--    }
--
--    if (this._buffer.length === 0) {
--      return;
--    }
--
--    var msg = this._buffer[0];
--
--    if (this._trySend(msg)) {
--      this._buffer.shift();
--
--      this._bufferSize = this._buffer.length;
--
--      this._tryBuffer();
--    }
--  };
--
--  DataConnection.prototype._sendChunks = function (blob) {
--    var e_1, _a;
--
--    var blobs = util_1.util.chunk(blob);
--    logger_1.default.log("DC#" + this.connectionId + " Try to send " + blobs.length + " chunks...");
--
--    try {
--      for (var blobs_1 = __values(blobs), blobs_1_1 = blobs_1.next(); !blobs_1_1.done; blobs_1_1 = blobs_1.next()) {
--        var blob_1 = blobs_1_1.value;
--        this.send(blob_1, true);
--      }
--    } catch (e_1_1) {
--      e_1 = {
--        error: e_1_1
--      };
--    } finally {
--      try {
--        if (blobs_1_1 && !blobs_1_1.done && (_a = blobs_1.return)) _a.call(blobs_1);
--      } finally {
--        if (e_1) throw e_1.error;
--      }
--    }
--  };
--
--  DataConnection.prototype.handleMessage = function (message) {
--    var payload = message.payload;
--
--    switch (message.type) {
--      case enums_1.ServerMessageType.Answer:
--        this._negotiator.handleSDP(message.type, payload.sdp);
--
--        break;
--
--      case enums_1.ServerMessageType.Candidate:
--        this._negotiator.handleCandidate(payload.candidate);
--
--        break;
--
--      default:
--        logger_1.default.warn("Unrecognized message type:", message.type, "from peer:", this.peer);
--        break;
--    }
--  };
--
--  DataConnection.ID_PREFIX = "dc_";
--  DataConnection.MAX_BUFFERED_AMOUNT = 8 * 1024 * 1024;
--  return DataConnection;
--}(baseconnection_1.BaseConnection);
--
--exports.DataConnection = DataConnection;
--},{"./util":"BHXf","./logger":"WOs9","./negotiator":"HCdX","./enums":"ZRYf","./baseconnection":"tQFK","./encodingQueue":"GGp6"}],"in7L":[function(require,module,exports) {
--"use strict";
--
--var __awaiter = this && this.__awaiter || function (thisArg, _arguments, P, generator) {
--  function adopt(value) {
--    return value instanceof P ? value : new P(function (resolve) {
--      resolve(value);
--    });
--  }
--
--  return new (P || (P = Promise))(function (resolve, reject) {
--    function fulfilled(value) {
--      try {
--        step(generator.next(value));
--      } catch (e) {
--        reject(e);
--      }
--    }
--
--    function rejected(value) {
--      try {
--        step(generator["throw"](value));
--      } catch (e) {
--        reject(e);
--      }
--    }
--
--    function step(result) {
--      result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected);
--    }
--
--    step((generator = generator.apply(thisArg, _arguments || [])).next());
--  });
--};
--
--var __generator = this && this.__generator || function (thisArg, body) {
--  var _ = {
--    label: 0,
--    sent: function sent() {
--      if (t[0] & 1) throw t[1];
--      return t[1];
--    },
--    trys: [],
--    ops: []
--  },
--      f,
--      y,
--      t,
--      g;
--  return g = {
--    next: verb(0),
--    "throw": verb(1),
--    "return": verb(2)
--  }, typeof Symbol === "function" && (g[Symbol.iterator] = function () {
--    return this;
--  }), g;
--
--  function verb(n) {
--    return function (v) {
--      return step([n, v]);
--    };
--  }
--
--  function step(op) {
--    if (f) throw new TypeError("Generator is already executing.");
--
--    while (_) {
--      try {
--        if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
--        if (y = 0, t) op = [op[0] & 2, t.value];
--
--        switch (op[0]) {
--          case 0:
--          case 1:
--            t = op;
--            break;
--
--          case 4:
--            _.label++;
--            return {
--              value: op[1],
--              done: false
--            };
--
--          case 5:
--            _.label++;
--            y = op[1];
--            op = [0];
--            continue;
--
--          case 7:
--            op = _.ops.pop();
--
--            _.trys.pop();
--
--            continue;
--
--          default:
--            if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) {
--              _ = 0;
--              continue;
--            }
--
--            if (op[0] === 3 && (!t || op[1] > t[0] && op[1] < t[3])) {
--              _.label = op[1];
--              break;
--            }
--
--            if (op[0] === 6 && _.label < t[1]) {
--              _.label = t[1];
--              t = op;
--              break;
--            }
--
--            if (t && _.label < t[2]) {
--              _.label = t[2];
--
--              _.ops.push(op);
--
--              break;
--            }
--
--            if (t[2]) _.ops.pop();
--
--            _.trys.pop();
--
--            continue;
--        }
--
--        op = body.call(thisArg, _);
--      } catch (e) {
--        op = [6, e];
--        y = 0;
--      } finally {
--        f = t = 0;
--      }
--    }
--
--    if (op[0] & 5) throw op[1];
--    return {
--      value: op[0] ? op[1] : void 0,
--      done: true
--    };
--  }
--};
--
--var __importDefault = this && this.__importDefault || function (mod) {
--  return mod && mod.__esModule ? mod : {
--    "default": mod
--  };
--};
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.API = void 0;
--
--var util_1 = require("./util");
--
--var logger_1 = __importDefault(require("./logger"));
--
--var API =
--/** @class */
--function () {
--  function API(_options) {
--    this._options = _options;
--  }
--
--  API.prototype._buildUrl = function (method) {
--    var protocol = this._options.secure ? "https://" : "http://";
--    var url = protocol + this._options.host + ":" + this._options.port + this._options.path + this._options.key + "/" + method;
--    var queryString = "?ts=" + new Date().getTime() + "" + Math.random();
--    url += queryString;
--    return url;
--  };
--  /** Get a unique ID from the server via XHR and initialize with it. */
--
--
--  API.prototype.retrieveId = function () {
--    return __awaiter(this, void 0, Promise, function () {
--      var url, response, error_1, pathError;
--      return __generator(this, function (_a) {
--        switch (_a.label) {
--          case 0:
--            url = this._buildUrl("id");
--            _a.label = 1;
--
--          case 1:
--            _a.trys.push([1, 3,, 4]);
--
--            return [4
--            /*yield*/
--            , fetch(url)];
--
--          case 2:
--            response = _a.sent();
--
--            if (response.status !== 200) {
--              throw new Error("Error. Status:" + response.status);
--            }
--
--            return [2
--            /*return*/
--            , response.text()];
--
--          case 3:
--            error_1 = _a.sent();
--            logger_1.default.error("Error retrieving ID", error_1);
--            pathError = "";
--
--            if (this._options.path === "/" && this._options.host !== util_1.util.CLOUD_HOST) {
--              pathError = " If you passed in a `path` to your self-hosted PeerServer, " + "you'll also need to pass in that same path when creating a new " + "Peer.";
--            }
--
--            throw new Error("Could not get an ID from the server." + pathError);
--
--          case 4:
--            return [2
--            /*return*/
--            ];
--        }
--      });
--    });
--  };
--  /** @deprecated */
--
--
--  API.prototype.listAllPeers = function () {
--    return __awaiter(this, void 0, Promise, function () {
--      var url, response, helpfulError, error_2;
--      return __generator(this, function (_a) {
--        switch (_a.label) {
--          case 0:
--            url = this._buildUrl("peers");
--            _a.label = 1;
--
--          case 1:
--            _a.trys.push([1, 3,, 4]);
--
--            return [4
--            /*yield*/
--            , fetch(url)];
--
--          case 2:
--            response = _a.sent();
--
--            if (response.status !== 200) {
--              if (response.status === 401) {
--                helpfulError = "";
--
--                if (this._options.host === util_1.util.CLOUD_HOST) {
--                  helpfulError = "It looks like you're using the cloud server. You can email " + "team@peerjs.com to enable peer listing for your API key.";
--                } else {
--                  helpfulError = "You need to enable `allow_discovery` on your self-hosted " + "PeerServer to use this feature.";
--                }
--
--                throw new Error("It doesn't look like you have permission to list peers IDs. " + helpfulError);
--              }
--
--              throw new Error("Error. Status:" + response.status);
--            }
--
--            return [2
--            /*return*/
--            , response.json()];
--
--          case 3:
--            error_2 = _a.sent();
--            logger_1.default.error("Error retrieving list peers", error_2);
--            throw new Error("Could not get list peers from the server." + error_2);
--
--          case 4:
--            return [2
--            /*return*/
--            ];
--        }
--      });
--    });
--  };
--
--  return API;
--}();
--
--exports.API = API;
--},{"./util":"BHXf","./logger":"WOs9"}],"Hxpd":[function(require,module,exports) {
--"use strict";
--
--var __extends = this && this.__extends || function () {
--  var _extendStatics = function extendStatics(d, b) {
--    _extendStatics = Object.setPrototypeOf || {
--      __proto__: []
--    } instanceof Array && function (d, b) {
--      d.__proto__ = b;
--    } || function (d, b) {
--      for (var p in b) {
--        if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p];
--      }
--    };
--
--    return _extendStatics(d, b);
--  };
--
--  return function (d, b) {
--    if (typeof b !== "function" && b !== null) throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
--
--    _extendStatics(d, b);
--
--    function __() {
--      this.constructor = d;
--    }
--
--    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
--  };
--}();
--
--var __assign = this && this.__assign || function () {
--  __assign = Object.assign || function (t) {
--    for (var s, i = 1, n = arguments.length; i < n; i++) {
--      s = arguments[i];
--
--      for (var p in s) {
--        if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
--      }
--    }
--
--    return t;
--  };
--
--  return __assign.apply(this, arguments);
--};
--
--var __values = this && this.__values || function (o) {
--  var s = typeof Symbol === "function" && Symbol.iterator,
--      m = s && o[s],
--      i = 0;
--  if (m) return m.call(o);
--  if (o && typeof o.length === "number") return {
--    next: function next() {
--      if (o && i >= o.length) o = void 0;
--      return {
--        value: o && o[i++],
--        done: !o
--      };
--    }
--  };
--  throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
--};
--
--var __read = this && this.__read || function (o, n) {
--  var m = typeof Symbol === "function" && o[Symbol.iterator];
--  if (!m) return o;
--  var i = m.call(o),
--      r,
--      ar = [],
--      e;
--
--  try {
--    while ((n === void 0 || n-- > 0) && !(r = i.next()).done) {
--      ar.push(r.value);
--    }
--  } catch (error) {
--    e = {
--      error: error
--    };
--  } finally {
--    try {
--      if (r && !r.done && (m = i["return"])) m.call(i);
--    } finally {
--      if (e) throw e.error;
--    }
--  }
--
--  return ar;
--};
--
--var __importDefault = this && this.__importDefault || function (mod) {
--  return mod && mod.__esModule ? mod : {
--    "default": mod
--  };
--};
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.Peer = void 0;
--
--var eventemitter3_1 = require("eventemitter3");
--
--var util_1 = require("./util");
--
--var logger_1 = __importDefault(require("./logger"));
--
--var socket_1 = require("./socket");
--
--var mediaconnection_1 = require("./mediaconnection");
--
--var dataconnection_1 = require("./dataconnection");
--
--var enums_1 = require("./enums");
--
--var api_1 = require("./api");
--
--var PeerOptions =
--/** @class */
--function () {
--  function PeerOptions() {}
--
--  return PeerOptions;
--}();
--/**
-- * A peer who can initiate connections with other peers.
-- */
--
--
--var Peer =
--/** @class */
--function (_super) {
--  __extends(Peer, _super);
--
--  function Peer(id, options) {
--    var _this = _super.call(this) || this;
--
--    _this._id = null;
--    _this._lastServerId = null; // States.
--
--    _this._destroyed = false; // Connections have been killed
--
--    _this._disconnected = false; // Connection to PeerServer killed but P2P connections still active
--
--    _this._open = false; // Sockets and such are not yet open.
--
--    _this._connections = new Map(); // All connections for this peer.
--
--    _this._lostMessages = new Map(); // src => [list of messages]
--
--    var userId; // Deal with overloading
--
--    if (id && id.constructor == Object) {
--      options = id;
--    } else if (id) {
--      userId = id.toString();
--    } // Configurize options
--
--
--    options = __assign({
--      debug: 0,
--      host: util_1.util.CLOUD_HOST,
--      port: util_1.util.CLOUD_PORT,
--      path: "/",
--      key: Peer.DEFAULT_KEY,
--      token: util_1.util.randomToken(),
--      config: util_1.util.defaultConfig
--    }, options);
--    _this._options = options; // Detect relative URL host.
--
--    if (_this._options.host === "/") {
--      _this._options.host = window.location.hostname;
--    } // Set path correctly.
--
--
--    if (_this._options.path) {
--      if (_this._options.path[0] !== "/") {
--        _this._options.path = "/" + _this._options.path;
--      }
--
--      if (_this._options.path[_this._options.path.length - 1] !== "/") {
--        _this._options.path += "/";
--      }
--    } // Set whether we use SSL to same as current host
--
--
--    if (_this._options.secure === undefined && _this._options.host !== util_1.util.CLOUD_HOST) {
--      _this._options.secure = util_1.util.isSecure();
--    } else if (_this._options.host == util_1.util.CLOUD_HOST) {
--      _this._options.secure = true;
--    } // Set a custom log function if present
--
--
--    if (_this._options.logFunction) {
--      logger_1.default.setLogFunction(_this._options.logFunction);
--    }
--
--    logger_1.default.logLevel = _this._options.debug || 0;
--    _this._api = new api_1.API(options);
--    _this._socket = _this._createServerConnection(); // Sanity checks
--    // Ensure WebRTC supported
--
--    if (!util_1.util.supports.audioVideo && !util_1.util.supports.data) {
--      _this._delayedAbort(enums_1.PeerErrorType.BrowserIncompatible, "The current browser does not support WebRTC");
--
--      return _this;
--    } // Ensure alphanumeric id
--
--
--    if (!!userId && !util_1.util.validateId(userId)) {
--      _this._delayedAbort(enums_1.PeerErrorType.InvalidID, "ID \"" + userId + "\" is invalid");
--
--      return _this;
--    }
--
--    if (userId) {
--      _this._initialize(userId);
--    } else {
--      _this._api.retrieveId().then(function (id) {
--        return _this._initialize(id);
--      }).catch(function (error) {
--        return _this._abort(enums_1.PeerErrorType.ServerError, error);
--      });
--    }
--
--    return _this;
--  }
--
--  Object.defineProperty(Peer.prototype, "id", {
--    get: function get() {
--      return this._id;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(Peer.prototype, "options", {
--    get: function get() {
--      return this._options;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(Peer.prototype, "open", {
--    get: function get() {
--      return this._open;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(Peer.prototype, "socket", {
--    get: function get() {
--      return this._socket;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(Peer.prototype, "connections", {
--    /**
--     * @deprecated
--     * Return type will change from Object to Map<string,[]>
--     */
--    get: function get() {
--      var e_1, _a;
--
--      var plainConnections = Object.create(null);
--
--      try {
--        for (var _b = __values(this._connections), _c = _b.next(); !_c.done; _c = _b.next()) {
--          var _d = __read(_c.value, 2),
--              k = _d[0],
--              v = _d[1];
--
--          plainConnections[k] = v;
--        }
--      } catch (e_1_1) {
--        e_1 = {
--          error: e_1_1
--        };
--      } finally {
--        try {
--          if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
--        } finally {
--          if (e_1) throw e_1.error;
--        }
--      }
--
--      return plainConnections;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(Peer.prototype, "destroyed", {
--    get: function get() {
--      return this._destroyed;
--    },
--    enumerable: false,
--    configurable: true
--  });
--  Object.defineProperty(Peer.prototype, "disconnected", {
--    get: function get() {
--      return this._disconnected;
--    },
--    enumerable: false,
--    configurable: true
--  });
--
--  Peer.prototype._createServerConnection = function () {
--    var _this = this;
--
--    var socket = new socket_1.Socket(this._options.secure, this._options.host, this._options.port, this._options.path, this._options.key, this._options.pingInterval);
--    socket.on(enums_1.SocketEventType.Message, function (data) {
--      _this._handleMessage(data);
--    });
--    socket.on(enums_1.SocketEventType.Error, function (error) {
--      _this._abort(enums_1.PeerErrorType.SocketError, error);
--    });
--    socket.on(enums_1.SocketEventType.Disconnected, function () {
--      if (_this.disconnected) {
--        return;
--      }
--
--      _this.emitError(enums_1.PeerErrorType.Network, "Lost connection to server.");
--
--      _this.disconnect();
--    });
--    socket.on(enums_1.SocketEventType.Close, function () {
--      if (_this.disconnected) {
--        return;
--      }
--
--      _this._abort(enums_1.PeerErrorType.SocketClosed, "Underlying socket is already closed.");
--    });
--    return socket;
--  };
--  /** Initialize a connection with the server. */
--
--
--  Peer.prototype._initialize = function (id) {
--    this._id = id;
--    this.socket.start(id, this._options.token);
--  };
--  /** Handles messages from the server. */
--
--
--  Peer.prototype._handleMessage = function (message) {
--    var e_2, _a;
--
--    var type = message.type;
--    var payload = message.payload;
--    var peerId = message.src;
--
--    switch (type) {
--      case enums_1.ServerMessageType.Open:
--        // The connection to the server is open.
--        this._lastServerId = this.id;
--        this._open = true;
--        this.emit(enums_1.PeerEventType.Open, this.id);
--        break;
--
--      case enums_1.ServerMessageType.Error:
--        // Server error.
--        this._abort(enums_1.PeerErrorType.ServerError, payload.msg);
--
--        break;
--
--      case enums_1.ServerMessageType.IdTaken:
--        // The selected ID is taken.
--        this._abort(enums_1.PeerErrorType.UnavailableID, "ID \"" + this.id + "\" is taken");
--
--        break;
--
--      case enums_1.ServerMessageType.InvalidKey:
--        // The given API key cannot be found.
--        this._abort(enums_1.PeerErrorType.InvalidKey, "API KEY \"" + this._options.key + "\" is invalid");
--
--        break;
--
--      case enums_1.ServerMessageType.Leave:
--        // Another peer has closed its connection to this peer.
--        logger_1.default.log("Received leave message from " + peerId);
--
--        this._cleanupPeer(peerId);
--
--        this._connections.delete(peerId);
--
--        break;
--
--      case enums_1.ServerMessageType.Expire:
--        // The offer sent to a peer has expired without response.
--        this.emitError(enums_1.PeerErrorType.PeerUnavailable, "Could not connect to peer " + peerId);
--        break;
--
--      case enums_1.ServerMessageType.Offer:
--        {
--          // we should consider switching this to CALL/CONNECT, but this is the least breaking option.
--          var connectionId = payload.connectionId;
--          var connection = this.getConnection(peerId, connectionId);
--
--          if (connection) {
--            connection.close();
--            logger_1.default.warn("Offer received for existing Connection ID:" + connectionId);
--          } // Create a new connection.
--
--
--          if (payload.type === enums_1.ConnectionType.Media) {
--            connection = new mediaconnection_1.MediaConnection(peerId, this, {
--              connectionId: connectionId,
--              _payload: payload,
--              metadata: payload.metadata
--            });
--
--            this._addConnection(peerId, connection);
--
--            this.emit(enums_1.PeerEventType.Call, connection);
--          } else if (payload.type === enums_1.ConnectionType.Data) {
--            connection = new dataconnection_1.DataConnection(peerId, this, {
--              connectionId: connectionId,
--              _payload: payload,
--              metadata: payload.metadata,
--              label: payload.label,
--              serialization: payload.serialization,
--              reliable: payload.reliable
--            });
--
--            this._addConnection(peerId, connection);
--
--            this.emit(enums_1.PeerEventType.Connection, connection);
--          } else {
--            logger_1.default.warn("Received malformed connection type:" + payload.type);
--            return;
--          } // Find messages.
--
--
--          var messages = this._getMessages(connectionId);
--
--          try {
--            for (var messages_1 = __values(messages), messages_1_1 = messages_1.next(); !messages_1_1.done; messages_1_1 = messages_1.next()) {
--              var message_1 = messages_1_1.value;
--              connection.handleMessage(message_1);
--            }
--          } catch (e_2_1) {
--            e_2 = {
--              error: e_2_1
--            };
--          } finally {
--            try {
--              if (messages_1_1 && !messages_1_1.done && (_a = messages_1.return)) _a.call(messages_1);
--            } finally {
--              if (e_2) throw e_2.error;
--            }
--          }
--
--          break;
--        }
--
--      default:
--        {
--          if (!payload) {
--            logger_1.default.warn("You received a malformed message from " + peerId + " of type " + type);
--            return;
--          }
--
--          var connectionId = payload.connectionId;
--          var connection = this.getConnection(peerId, connectionId);
--
--          if (connection && connection.peerConnection) {
--            // Pass it on.
--            connection.handleMessage(message);
--          } else if (connectionId) {
--            // Store for possible later use
--            this._storeMessage(connectionId, message);
--          } else {
--            logger_1.default.warn("You received an unrecognized message:", message);
--          }
--
--          break;
--        }
--    }
--  };
--  /** Stores messages without a set up connection, to be claimed later. */
--
--
--  Peer.prototype._storeMessage = function (connectionId, message) {
--    if (!this._lostMessages.has(connectionId)) {
--      this._lostMessages.set(connectionId, []);
--    }
--
--    this._lostMessages.get(connectionId).push(message);
--  };
--  /** Retrieve messages from lost message store */
--  //TODO Change it to private
--
--
--  Peer.prototype._getMessages = function (connectionId) {
--    var messages = this._lostMessages.get(connectionId);
--
--    if (messages) {
--      this._lostMessages.delete(connectionId);
--
--      return messages;
--    }
--
--    return [];
--  };
--  /**
--   * Returns a DataConnection to the specified peer. See documentation for a
--   * complete list of options.
--   */
--
--
--  Peer.prototype.connect = function (peer, options) {
--    if (options === void 0) {
--      options = {};
--    }
--
--    if (this.disconnected) {
--      logger_1.default.warn("You cannot connect to a new Peer because you called " + ".disconnect() on this Peer and ended your connection with the " + "server. You can create a new Peer to reconnect, or call reconnect " + "on this peer if you believe its ID to still be available.");
--      this.emitError(enums_1.PeerErrorType.Disconnected, "Cannot connect to new Peer after disconnecting from server.");
--      return;
--    }
--
--    var dataConnection = new dataconnection_1.DataConnection(peer, this, options);
--
--    this._addConnection(peer, dataConnection);
--
--    return dataConnection;
--  };
--  /**
--   * Returns a MediaConnection to the specified peer. See documentation for a
--   * complete list of options.
--   */
--
--
--  Peer.prototype.call = function (peer, stream, options) {
--    if (options === void 0) {
--      options = {};
--    }
--
--    if (this.disconnected) {
--      logger_1.default.warn("You cannot connect to a new Peer because you called " + ".disconnect() on this Peer and ended your connection with the " + "server. You can create a new Peer to reconnect.");
--      this.emitError(enums_1.PeerErrorType.Disconnected, "Cannot connect to new Peer after disconnecting from server.");
--      return;
--    }
--
--    if (!stream) {
--      logger_1.default.error("To call a peer, you must provide a stream from your browser's `getUserMedia`.");
--      return;
--    }
--
--    options._stream = stream;
--    var mediaConnection = new mediaconnection_1.MediaConnection(peer, this, options);
--
--    this._addConnection(peer, mediaConnection);
--
--    return mediaConnection;
--  };
--  /** Add a data/media connection to this peer. */
--
--
--  Peer.prototype._addConnection = function (peerId, connection) {
--    logger_1.default.log("add connection " + connection.type + ":" + connection.connectionId + " to peerId:" + peerId);
--
--    if (!this._connections.has(peerId)) {
--      this._connections.set(peerId, []);
--    }
--
--    this._connections.get(peerId).push(connection);
--  }; //TODO should be private
--
--
--  Peer.prototype._removeConnection = function (connection) {
--    var connections = this._connections.get(connection.peer);
--
--    if (connections) {
--      var index = connections.indexOf(connection);
--
--      if (index !== -1) {
--        connections.splice(index, 1);
--      }
--    } //remove from lost messages
--
--
--    this._lostMessages.delete(connection.connectionId);
--  };
--  /** Retrieve a data/media connection for this peer. */
--
--
--  Peer.prototype.getConnection = function (peerId, connectionId) {
--    var e_3, _a;
--
--    var connections = this._connections.get(peerId);
--
--    if (!connections) {
--      return null;
--    }
--
--    try {
--      for (var connections_1 = __values(connections), connections_1_1 = connections_1.next(); !connections_1_1.done; connections_1_1 = connections_1.next()) {
--        var connection = connections_1_1.value;
--
--        if (connection.connectionId === connectionId) {
--          return connection;
--        }
--      }
--    } catch (e_3_1) {
--      e_3 = {
--        error: e_3_1
--      };
--    } finally {
--      try {
--        if (connections_1_1 && !connections_1_1.done && (_a = connections_1.return)) _a.call(connections_1);
--      } finally {
--        if (e_3) throw e_3.error;
--      }
--    }
--
--    return null;
--  };
--
--  Peer.prototype._delayedAbort = function (type, message) {
--    var _this = this;
--
--    setTimeout(function () {
--      _this._abort(type, message);
--    }, 0);
--  };
--  /**
--   * Emits an error message and destroys the Peer.
--   * The Peer is not destroyed if it's in a disconnected state, in which case
--   * it retains its disconnected state and its existing connections.
--   */
--
--
--  Peer.prototype._abort = function (type, message) {
--    logger_1.default.error("Aborting!");
--    this.emitError(type, message);
--
--    if (!this._lastServerId) {
--      this.destroy();
--    } else {
--      this.disconnect();
--    }
--  };
--  /** Emits a typed error message. */
--
--
--  Peer.prototype.emitError = function (type, err) {
--    logger_1.default.error("Error:", err);
--    var error;
--
--    if (typeof err === "string") {
--      error = new Error(err);
--    } else {
--      error = err;
--    }
--
--    error.type = type;
--    this.emit(enums_1.PeerEventType.Error, error);
--  };
--  /**
--   * Destroys the Peer: closes all active connections as well as the connection
--   *  to the server.
--   * Warning: The peer can no longer create or accept connections after being
--   *  destroyed.
--   */
--
--
--  Peer.prototype.destroy = function () {
--    if (this.destroyed) {
--      return;
--    }
--
--    logger_1.default.log("Destroy peer with ID:" + this.id);
--    this.disconnect();
--
--    this._cleanup();
--
--    this._destroyed = true;
--    this.emit(enums_1.PeerEventType.Close);
--  };
--  /** Disconnects every connection on this peer. */
--
--
--  Peer.prototype._cleanup = function () {
--    var e_4, _a;
--
--    try {
--      for (var _b = __values(this._connections.keys()), _c = _b.next(); !_c.done; _c = _b.next()) {
--        var peerId = _c.value;
--
--        this._cleanupPeer(peerId);
--
--        this._connections.delete(peerId);
--      }
--    } catch (e_4_1) {
--      e_4 = {
--        error: e_4_1
--      };
--    } finally {
--      try {
--        if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
--      } finally {
--        if (e_4) throw e_4.error;
--      }
--    }
--
--    this.socket.removeAllListeners();
--  };
--  /** Closes all connections to this peer. */
--
--
--  Peer.prototype._cleanupPeer = function (peerId) {
--    var e_5, _a;
--
--    var connections = this._connections.get(peerId);
--
--    if (!connections) return;
--
--    try {
--      for (var connections_2 = __values(connections), connections_2_1 = connections_2.next(); !connections_2_1.done; connections_2_1 = connections_2.next()) {
--        var connection = connections_2_1.value;
--        connection.close();
--      }
--    } catch (e_5_1) {
--      e_5 = {
--        error: e_5_1
--      };
--    } finally {
--      try {
--        if (connections_2_1 && !connections_2_1.done && (_a = connections_2.return)) _a.call(connections_2);
--      } finally {
--        if (e_5) throw e_5.error;
--      }
--    }
--  };
--  /**
--   * Disconnects the Peer's connection to the PeerServer. Does not close any
--   *  active connections.
--   * Warning: The peer can no longer create or accept connections after being
--   *  disconnected. It also cannot reconnect to the server.
--   */
--
--
--  Peer.prototype.disconnect = function () {
--    if (this.disconnected) {
--      return;
--    }
--
--    var currentId = this.id;
--    logger_1.default.log("Disconnect peer with ID:" + currentId);
--    this._disconnected = true;
--    this._open = false;
--    this.socket.close();
--    this._lastServerId = currentId;
--    this._id = null;
--    this.emit(enums_1.PeerEventType.Disconnected, currentId);
--  };
--  /** Attempts to reconnect with the same ID. */
--
--
--  Peer.prototype.reconnect = function () {
--    if (this.disconnected && !this.destroyed) {
--      logger_1.default.log("Attempting reconnection to server with ID " + this._lastServerId);
--      this._disconnected = false;
--
--      this._initialize(this._lastServerId);
--    } else if (this.destroyed) {
--      throw new Error("This peer cannot reconnect to the server. It has already been destroyed.");
--    } else if (!this.disconnected && !this.open) {
--      // Do nothing. We're still connecting the first time.
--      logger_1.default.error("In a hurry? We're still trying to make the initial connection!");
--    } else {
--      throw new Error("Peer " + this.id + " cannot reconnect because it is not disconnected from the server!");
--    }
--  };
--  /**
--   * Get a list of available peer IDs. If you're running your own server, you'll
--   * want to set allow_discovery: true in the PeerServer options. If you're using
--   * the cloud server, email team@peerjs.com to get the functionality enabled for
--   * your key.
--   */
--
--
--  Peer.prototype.listAllPeers = function (cb) {
--    var _this = this;
--
--    if (cb === void 0) {
--      cb = function cb(_) {};
--    }
--
--    this._api.listAllPeers().then(function (peers) {
--      return cb(peers);
--    }).catch(function (error) {
--      return _this._abort(enums_1.PeerErrorType.ServerError, error);
--    });
--  };
--
--  Peer.DEFAULT_KEY = "peerjs";
--  return Peer;
--}(eventemitter3_1.EventEmitter);
--
--exports.Peer = Peer;
--},{"eventemitter3":"JJlS","./util":"BHXf","./logger":"WOs9","./socket":"wJlv","./mediaconnection":"dbHP","./dataconnection":"GBTQ","./enums":"ZRYf","./api":"in7L"}],"iTK6":[function(require,module,exports) {
--"use strict";
--
--Object.defineProperty(exports, "__esModule", {
--  value: true
--});
--exports.peerjs = void 0;
--
--var util_1 = require("./util");
--
--var peer_1 = require("./peer");
--
--exports.peerjs = {
--  Peer: peer_1.Peer,
--  util: util_1.util
--};
--exports.default = peer_1.Peer;
--window.peerjs = exports.peerjs;
--/** @deprecated Should use peerjs namespace */
--
--window.Peer = peer_1.Peer;
--},{"./util":"BHXf","./peer":"Hxpd"}]},{},["iTK6"], null)
--//# sourceMappingURL=/peerjs.js.map
-\ No newline at end of file
-diff --git a/node_modules/peerjs/dist/peerjs.js.map b/node_modules/peerjs/dist/peerjs.js.map
-deleted file mode 100644
-index fd1786e..0000000
---- a/node_modules/peerjs/dist/peerjs.js.map
-+++ /dev/null
-@@ -1 +0,0 @@
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binaryFeatures = {};\r\nbinaryFeatures.useBlobBuilder = (function () {\r\n  try {\r\n    new Blob([]);\r\n    return false;\r\n  } catch (e) {\r\n    return true;\r\n  }\r\n})();\r\n\r\nbinaryFeatures.useArrayBufferView = !binaryFeatures.useBlobBuilder && (function () {\r\n  try {\r\n    return (new Blob([new Uint8Array([])])).size === 0;\r\n  } catch (e) {\r\n    return true;\r\n  }\r\n})();\r\n\r\nmodule.exports.binaryFeatures = binaryFeatures;\r\nvar BlobBuilder = module.exports.BlobBuilder;\r\nif (typeof window !== 'undefined') {\r\n  BlobBuilder = module.exports.BlobBuilder = window.WebKitBlobBuilder ||\r\n    window.MozBlobBuilder || window.MSBlobBuilder || window.BlobBuilder;\r\n}\r\n\r\nfunction BufferBuilder () {\r\n  this._pieces = [];\r\n  this._parts = [];\r\n}\r\n\r\nBufferBuilder.prototype.append = function (data) {\r\n  if (typeof data === 'number') {\r\n    this._pieces.push(data);\r\n  } else {\r\n    this.flush();\r\n    this._parts.push(data);\r\n  }\r\n};\r\n\r\nBufferBuilder.prototype.flush = function () {\r\n  if (this._pieces.length > 0) {\r\n    var buf = new Uint8Array(this._pieces);\r\n    if (!binaryFeatures.useArrayBufferView) {\r\n      buf = buf.buffer;\r\n    }\r\n    this._parts.push(buf);\r\n    this._pieces = [];\r\n  }\r\n};\r\n\r\nBufferBuilder.prototype.getBuffer = function () {\r\n  this.flush();\r\n  if (binaryFeatures.useBlobBuilder) {\r\n    var builder = new BlobBuilder();\r\n    for (var i = 0, ii = this._parts.length; i < ii; i++) {\r\n      builder.append(this._parts[i]);\r\n    }\r\n    return builder.getBlob();\r\n  } else {\r\n    return new Blob(this._parts);\r\n  }\r\n};\r\n\r\nmodule.exports.BufferBuilder = BufferBuilder;\r\n","var BufferBuilder = require('./bufferbuilder').BufferBuilder;\r\nvar binaryFeatures = require('./bufferbuilder').binaryFeatures;\r\n\r\nvar BinaryPack = {\r\n  unpack: function (data) {\r\n    var unpacker = new Unpacker(data);\r\n    return unpacker.unpack();\r\n  },\r\n  pack: function (data) {\r\n    var packer = new Packer();\r\n    packer.pack(data);\r\n    var buffer = packer.getBuffer();\r\n    return buffer;\r\n  }\r\n};\r\n\r\nmodule.exports = BinaryPack;\r\n\r\nfunction Unpacker (data) {\r\n  // Data is ArrayBuffer\r\n  this.index = 0;\r\n  this.dataBuffer = data;\r\n  this.dataView = new Uint8Array(this.dataBuffer);\r\n  this.length = this.dataBuffer.byteLength;\r\n}\r\n\r\nUnpacker.prototype.unpack = function () {\r\n  var type = this.unpack_uint8();\r\n  if (type < 0x80) {\r\n    return type;\r\n  } else if ((type ^ 0xe0) < 0x20) {\r\n    return (type ^ 0xe0) - 0x20;\r\n  }\r\n\r\n  var size;\r\n  if ((size = type ^ 0xa0) <= 0x0f) {\r\n    return this.unpack_raw(size);\r\n  } else if ((size = type ^ 0xb0) <= 0x0f) {\r\n    return this.unpack_string(size);\r\n  } else if ((size = type ^ 0x90) <= 0x0f) {\r\n    return this.unpack_array(size);\r\n  } else if ((size = type ^ 0x80) <= 0x0f) {\r\n    return this.unpack_map(size);\r\n  }\r\n\r\n  switch (type) {\r\n    case 0xc0:\r\n      return null;\r\n    case 0xc1:\r\n      return undefined;\r\n    case 0xc2:\r\n      return false;\r\n    case 0xc3:\r\n      return true;\r\n    case 0xca:\r\n      return this.unpack_float();\r\n    case 0xcb:\r\n      return this.unpack_double();\r\n    case 0xcc:\r\n      return this.unpack_uint8();\r\n    case 0xcd:\r\n      return this.unpack_uint16();\r\n    case 0xce:\r\n      return this.unpack_uint32();\r\n    case 0xcf:\r\n      return this.unpack_uint64();\r\n    case 0xd0:\r\n      return this.unpack_int8();\r\n    case 0xd1:\r\n      return this.unpack_int16();\r\n    case 0xd2:\r\n      return this.unpack_int32();\r\n    case 0xd3:\r\n      return this.unpack_int64();\r\n    case 0xd4:\r\n      return undefined;\r\n    case 0xd5:\r\n      return undefined;\r\n    case 0xd6:\r\n      return undefined;\r\n    case 0xd7:\r\n      return undefined;\r\n    case 0xd8:\r\n      size = this.unpack_uint16();\r\n      return this.unpack_string(size);\r\n    case 0xd9:\r\n      size = this.unpack_uint32();\r\n      return this.unpack_string(size);\r\n    case 0xda:\r\n      size = this.unpack_uint16();\r\n      return this.unpack_raw(size);\r\n    case 0xdb:\r\n      size = this.unpack_uint32();\r\n      return this.unpack_raw(size);\r\n    case 0xdc:\r\n      size = this.unpack_uint16();\r\n      return this.unpack_array(size);\r\n    case 0xdd:\r\n      size = this.unpack_uint32();\r\n      return this.unpack_array(size);\r\n    case 0xde:\r\n      size = this.unpack_uint16();\r\n      return this.unpack_map(size);\r\n    case 0xdf:\r\n      size = this.unpack_uint32();\r\n      return this.unpack_map(size);\r\n  }\r\n};\r\n\r\nUnpacker.prototype.unpack_uint8 = function () {\r\n  var byte = this.dataView[this.index] & 0xff;\r\n  this.index++;\r\n  return byte;\r\n};\r\n\r\nUnpacker.prototype.unpack_uint16 = function () {\r\n  var bytes = this.read(2);\r\n  var uint16 =\r\n    ((bytes[0] & 0xff) * 256) + (bytes[1] & 0xff);\r\n  this.index += 2;\r\n  return uint16;\r\n};\r\n\r\nUnpacker.prototype.unpack_uint32 = function () {\r\n  var bytes = this.read(4);\r\n  var uint32 =\r\n    ((bytes[0] * 256 +\r\n      bytes[1]) * 256 +\r\n      bytes[2]) * 256 +\r\n    bytes[3];\r\n  this.index += 4;\r\n  return uint32;\r\n};\r\n\r\nUnpacker.prototype.unpack_uint64 = function () {\r\n  var bytes = this.read(8);\r\n  var uint64 =\r\n    ((((((bytes[0] * 256 +\r\n      bytes[1]) * 256 +\r\n      bytes[2]) * 256 +\r\n      bytes[3]) * 256 +\r\n      bytes[4]) * 256 +\r\n      bytes[5]) * 256 +\r\n      bytes[6]) * 256 +\r\n    bytes[7];\r\n  this.index += 8;\r\n  return uint64;\r\n};\r\n\r\nUnpacker.prototype.unpack_int8 = function () {\r\n  var uint8 = this.unpack_uint8();\r\n  return (uint8 < 0x80) ? uint8 : uint8 - (1 << 8);\r\n};\r\n\r\nUnpacker.prototype.unpack_int16 = function () {\r\n  var uint16 = this.unpack_uint16();\r\n  return (uint16 < 0x8000) ? uint16 : uint16 - (1 << 16);\r\n};\r\n\r\nUnpacker.prototype.unpack_int32 = function () {\r\n  var uint32 = this.unpack_uint32();\r\n  return (uint32 < Math.pow(2, 31)) ? uint32\r\n    : uint32 - Math.pow(2, 32);\r\n};\r\n\r\nUnpacker.prototype.unpack_int64 = function () {\r\n  var uint64 = this.unpack_uint64();\r\n  return (uint64 < Math.pow(2, 63)) ? uint64\r\n    : uint64 - Math.pow(2, 64);\r\n};\r\n\r\nUnpacker.prototype.unpack_raw = function (size) {\r\n  if (this.length < this.index + size) {\r\n    throw new Error('BinaryPackFailure: index is out of range' +\r\n      ' ' + this.index + ' ' + size + ' ' + this.length);\r\n  }\r\n  var buf = this.dataBuffer.slice(this.index, this.index + size);\r\n  this.index += size;\r\n\r\n  // buf = util.bufferToString(buf);\r\n\r\n  return buf;\r\n};\r\n\r\nUnpacker.prototype.unpack_string = function (size) {\r\n  var bytes = this.read(size);\r\n  var i = 0;\r\n  var str = '';\r\n  var c;\r\n  var code;\r\n\r\n  while (i < size) {\r\n    c = bytes[i];\r\n    if (c < 128) {\r\n      str += String.fromCharCode(c);\r\n      i++;\r\n    } else if ((c ^ 0xc0) < 32) {\r\n      code = ((c ^ 0xc0) << 6) | (bytes[i + 1] & 63);\r\n      str += String.fromCharCode(code);\r\n      i += 2;\r\n    } else {\r\n      code = ((c & 15) << 12) | ((bytes[i + 1] & 63) << 6) |\r\n        (bytes[i + 2] & 63);\r\n      str += String.fromCharCode(code);\r\n      i += 3;\r\n    }\r\n  }\r\n\r\n  this.index += size;\r\n  return str;\r\n};\r\n\r\nUnpacker.prototype.unpack_array = function (size) {\r\n  var objects = new Array(size);\r\n  for (var i = 0; i < size; i++) {\r\n    objects[i] = this.unpack();\r\n  }\r\n  return objects;\r\n};\r\n\r\nUnpacker.prototype.unpack_map = function (size) {\r\n  var map = {};\r\n  for (var i = 0; i < size; i++) {\r\n    var key = this.unpack();\r\n    var value = this.unpack();\r\n    map[key] = value;\r\n  }\r\n  return map;\r\n};\r\n\r\nUnpacker.prototype.unpack_float = function () {\r\n  var uint32 = this.unpack_uint32();\r\n  var sign = uint32 >> 31;\r\n  var exp = ((uint32 >> 23) & 0xff) - 127;\r\n  var fraction = (uint32 & 0x7fffff) | 0x800000;\r\n  return (sign === 0 ? 1 : -1) *\r\n    fraction * Math.pow(2, exp - 23);\r\n};\r\n\r\nUnpacker.prototype.unpack_double = function () {\r\n  var h32 = this.unpack_uint32();\r\n  var l32 = this.unpack_uint32();\r\n  var sign = h32 >> 31;\r\n  var exp = ((h32 >> 20) & 0x7ff) - 1023;\r\n  var hfrac = (h32 & 0xfffff) | 0x100000;\r\n  var frac = hfrac * Math.pow(2, exp - 20) +\r\n    l32 * Math.pow(2, exp - 52);\r\n  return (sign === 0 ? 1 : -1) * frac;\r\n};\r\n\r\nUnpacker.prototype.read = function (length) {\r\n  var j = this.index;\r\n  if (j + length <= this.length) {\r\n    return this.dataView.subarray(j, j + length);\r\n  } else {\r\n    throw new Error('BinaryPackFailure: read index out of range');\r\n  }\r\n};\r\n\r\nfunction Packer () {\r\n  this.bufferBuilder = new BufferBuilder();\r\n}\r\n\r\nPacker.prototype.getBuffer = function () {\r\n  return this.bufferBuilder.getBuffer();\r\n};\r\n\r\nPacker.prototype.pack = function (value) {\r\n  var type = typeof (value);\r\n  if (type === 'string') {\r\n    this.pack_string(value);\r\n  } else if (type === 'number') {\r\n    if (Math.floor(value) === value) {\r\n      this.pack_integer(value);\r\n    } else {\r\n      this.pack_double(value);\r\n    }\r\n  } else if (type === 'boolean') {\r\n    if (value === true) {\r\n      this.bufferBuilder.append(0xc3);\r\n    } else if (value === false) {\r\n      this.bufferBuilder.append(0xc2);\r\n    }\r\n  } else if (type === 'undefined') {\r\n    this.bufferBuilder.append(0xc0);\r\n  } else if (type === 'object') {\r\n    if (value === null) {\r\n      this.bufferBuilder.append(0xc0);\r\n    } else {\r\n      var constructor = value.constructor;\r\n      if (constructor == Array) {\r\n        this.pack_array(value);\r\n      } else if (constructor == Blob || constructor == File || value instanceof Blob || value instanceof File) {\r\n        this.pack_bin(value);\r\n      } else if (constructor == ArrayBuffer) {\r\n        if (binaryFeatures.useArrayBufferView) {\r\n          this.pack_bin(new Uint8Array(value));\r\n        } else {\r\n          this.pack_bin(value);\r\n        }\r\n      } else if ('BYTES_PER_ELEMENT' in value) {\r\n        if (binaryFeatures.useArrayBufferView) {\r\n          this.pack_bin(new Uint8Array(value.buffer));\r\n        } else {\r\n          this.pack_bin(value.buffer);\r\n        }\r\n      } else if ((constructor == Object) || (constructor.toString().startsWith('class'))) {\r\n        this.pack_object(value);\r\n      } else if (constructor == Date) {\r\n        this.pack_string(value.toString());\r\n      } else if (typeof value.toBinaryPack === 'function') {\r\n        this.bufferBuilder.append(value.toBinaryPack());\r\n      } else {\r\n        throw new Error('Type \"' + constructor.toString() + '\" not yet supported');\r\n      }\r\n    }\r\n  } else {\r\n    throw new Error('Type \"' + type + '\" not yet supported');\r\n  }\r\n  this.bufferBuilder.flush();\r\n};\r\n\r\nPacker.prototype.pack_bin = function (blob) {\r\n  var length = blob.length || blob.byteLength || blob.size;\r\n  if (length <= 0x0f) {\r\n    this.pack_uint8(0xa0 + length);\r\n  } else if (length <= 0xffff) {\r\n    this.bufferBuilder.append(0xda);\r\n    this.pack_uint16(length);\r\n  } else if (length <= 0xffffffff) {\r\n    this.bufferBuilder.append(0xdb);\r\n    this.pack_uint32(length);\r\n  } else {\r\n    throw new Error('Invalid length');\r\n  }\r\n  this.bufferBuilder.append(blob);\r\n};\r\n\r\nPacker.prototype.pack_string = function (str) {\r\n  var length = utf8Length(str);\r\n\r\n  if (length <= 0x0f) {\r\n    this.pack_uint8(0xb0 + length);\r\n  } else if (length <= 0xffff) {\r\n    this.bufferBuilder.append(0xd8);\r\n    this.pack_uint16(length);\r\n  } else if (length <= 0xffffffff) {\r\n    this.bufferBuilder.append(0xd9);\r\n    this.pack_uint32(length);\r\n  } else {\r\n    throw new Error('Invalid length');\r\n  }\r\n  this.bufferBuilder.append(str);\r\n};\r\n\r\nPacker.prototype.pack_array = function (ary) {\r\n  var length = ary.length;\r\n  if (length <= 0x0f) {\r\n    this.pack_uint8(0x90 + length);\r\n  } else if (length <= 0xffff) {\r\n    this.bufferBuilder.append(0xdc);\r\n    this.pack_uint16(length);\r\n  } else if (length <= 0xffffffff) {\r\n    this.bufferBuilder.append(0xdd);\r\n    this.pack_uint32(length);\r\n  } else {\r\n    throw new Error('Invalid length');\r\n  }\r\n  for (var i = 0; i < length; i++) {\r\n    this.pack(ary[i]);\r\n  }\r\n};\r\n\r\nPacker.prototype.pack_integer = function (num) {\r\n  if (num >= -0x20 && num <= 0x7f) {\r\n    this.bufferBuilder.append(num & 0xff);\r\n  } else if (num >= 0x00 && num <= 0xff) {\r\n    this.bufferBuilder.append(0xcc);\r\n    this.pack_uint8(num);\r\n  } else if (num >= -0x80 && num <= 0x7f) {\r\n    this.bufferBuilder.append(0xd0);\r\n    this.pack_int8(num);\r\n  } else if (num >= 0x0000 && num <= 0xffff) {\r\n    this.bufferBuilder.append(0xcd);\r\n    this.pack_uint16(num);\r\n  } else if (num >= -0x8000 && num <= 0x7fff) {\r\n    this.bufferBuilder.append(0xd1);\r\n    this.pack_int16(num);\r\n  } else if (num >= 0x00000000 && num <= 0xffffffff) {\r\n    this.bufferBuilder.append(0xce);\r\n    this.pack_uint32(num);\r\n  } else if (num >= -0x80000000 && num <= 0x7fffffff) {\r\n    this.bufferBuilder.append(0xd2);\r\n    this.pack_int32(num);\r\n  } else if (num >= -0x8000000000000000 && num <= 0x7FFFFFFFFFFFFFFF) {\r\n    this.bufferBuilder.append(0xd3);\r\n    this.pack_int64(num);\r\n  } else if (num >= 0x0000000000000000 && num <= 0xFFFFFFFFFFFFFFFF) {\r\n    this.bufferBuilder.append(0xcf);\r\n    this.pack_uint64(num);\r\n  } else {\r\n    throw new Error('Invalid integer');\r\n  }\r\n};\r\n\r\nPacker.prototype.pack_double = function (num) {\r\n  var sign = 0;\r\n  if (num < 0) {\r\n    sign = 1;\r\n    num = -num;\r\n  }\r\n  var exp = Math.floor(Math.log(num) / Math.LN2);\r\n  var frac0 = num / Math.pow(2, exp) - 1;\r\n  var frac1 = Math.floor(frac0 * Math.pow(2, 52));\r\n  var b32 = Math.pow(2, 32);\r\n  var h32 = (sign << 31) | ((exp + 1023) << 20) |\r\n    (frac1 / b32) & 0x0fffff;\r\n  var l32 = frac1 % b32;\r\n  this.bufferBuilder.append(0xcb);\r\n  this.pack_int32(h32);\r\n  this.pack_int32(l32);\r\n};\r\n\r\nPacker.prototype.pack_object = function (obj) {\r\n  var keys = Object.keys(obj);\r\n  var length = keys.length;\r\n  if (length <= 0x0f) {\r\n    this.pack_uint8(0x80 + length);\r\n  } else if (length <= 0xffff) {\r\n    this.bufferBuilder.append(0xde);\r\n    this.pack_uint16(length);\r\n  } else if (length <= 0xffffffff) {\r\n    this.bufferBuilder.append(0xdf);\r\n    this.pack_uint32(length);\r\n  } else {\r\n    throw new Error('Invalid length');\r\n  }\r\n  for (var prop in obj) {\r\n    if (obj.hasOwnProperty(prop)) {\r\n      this.pack(prop);\r\n      this.pack(obj[prop]);\r\n    }\r\n  }\r\n};\r\n\r\nPacker.prototype.pack_uint8 = function (num) {\r\n  this.bufferBuilder.append(num);\r\n};\r\n\r\nPacker.prototype.pack_uint16 = function (num) {\r\n  this.bufferBuilder.append(num >> 8);\r\n  this.bufferBuilder.append(num & 0xff);\r\n};\r\n\r\nPacker.prototype.pack_uint32 = function (num) {\r\n  var n = num & 0xffffffff;\r\n  this.bufferBuilder.append((n & 0xff000000) >>> 24);\r\n  this.bufferBuilder.append((n & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((n & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((n & 0x000000ff));\r\n};\r\n\r\nPacker.prototype.pack_uint64 = function (num) {\r\n  var high = num / Math.pow(2, 32);\r\n  var low = num % Math.pow(2, 32);\r\n  this.bufferBuilder.append((high & 0xff000000) >>> 24);\r\n  this.bufferBuilder.append((high & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((high & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((high & 0x000000ff));\r\n  this.bufferBuilder.append((low & 0xff000000) >>> 24);\r\n  this.bufferBuilder.append((low & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((low & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((low & 0x000000ff));\r\n};\r\n\r\nPacker.prototype.pack_int8 = function (num) {\r\n  this.bufferBuilder.append(num & 0xff);\r\n};\r\n\r\nPacker.prototype.pack_int16 = function (num) {\r\n  this.bufferBuilder.append((num & 0xff00) >> 8);\r\n  this.bufferBuilder.append(num & 0xff);\r\n};\r\n\r\nPacker.prototype.pack_int32 = function (num) {\r\n  this.bufferBuilder.append((num >>> 24) & 0xff);\r\n  this.bufferBuilder.append((num & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((num & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((num & 0x000000ff));\r\n};\r\n\r\nPacker.prototype.pack_int64 = function (num) {\r\n  var high = Math.floor(num / Math.pow(2, 32));\r\n  var low = num % Math.pow(2, 32);\r\n  this.bufferBuilder.append((high & 0xff000000) >>> 24);\r\n  this.bufferBuilder.append((high & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((high & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((high & 0x000000ff));\r\n  this.bufferBuilder.append((low & 0xff000000) >>> 24);\r\n  this.bufferBuilder.append((low & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((low & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((low & 0x000000ff));\r\n};\r\n\r\nfunction _utf8Replace (m) {\r\n  var code = m.charCodeAt(0);\r\n\r\n  if (code <= 0x7ff) return '00';\r\n  if (code <= 0xffff) return '000';\r\n  if (code <= 0x1fffff) return '0000';\r\n  if (code <= 0x3ffffff) return '00000';\r\n  return '000000';\r\n}\r\n\r\nfunction utf8Length (str) {\r\n  if (str.length > 600) {\r\n    // Blob method faster for large strings\r\n    return (new Blob([str])).size;\r\n  } else {\r\n    return str.replace(/[^\\u0000-\\u007F]/g, _utf8Replace).length;\r\n  }\r\n}\r\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nlet logDisabled_ = true;\nlet deprecationWarnings_ = true;\n\n/**\n * Extract browser version out of the provided user agent string.\n *\n * @param {!string} uastring userAgent string.\n * @param {!string} expr Regular expression used as match criteria.\n * @param {!number} pos position in the version string to be returned.\n * @return {!number} browser version.\n */\nexport function extractVersion(uastring, expr, pos) {\n  const match = uastring.match(expr);\n  return match && match.length >= pos && parseInt(match[pos], 10);\n}\n\n// Wraps the peerconnection event eventNameToWrap in a function\n// which returns the modified event object (or false to prevent\n// the event).\nexport function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  const proto = window.RTCPeerConnection.prototype;\n  const nativeAddEventListener = proto.addEventListener;\n  proto.addEventListener = function(nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap) {\n      return nativeAddEventListener.apply(this, arguments);\n    }\n    const wrappedCallback = (e) => {\n      const modifiedEvent = wrapper(e);\n      if (modifiedEvent) {\n        if (cb.handleEvent) {\n          cb.handleEvent(modifiedEvent);\n        } else {\n          cb(modifiedEvent);\n        }\n      }\n    };\n    this._eventMap = this._eventMap || {};\n    if (!this._eventMap[eventNameToWrap]) {\n      this._eventMap[eventNameToWrap] = new Map();\n    }\n    this._eventMap[eventNameToWrap].set(cb, wrappedCallback);\n    return nativeAddEventListener.apply(this, [nativeEventName,\n      wrappedCallback]);\n  };\n\n  const nativeRemoveEventListener = proto.removeEventListener;\n  proto.removeEventListener = function(nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap || !this._eventMap\n        || !this._eventMap[eventNameToWrap]) {\n      return nativeRemoveEventListener.apply(this, arguments);\n    }\n    if (!this._eventMap[eventNameToWrap].has(cb)) {\n      return nativeRemoveEventListener.apply(this, arguments);\n    }\n    const unwrappedCb = this._eventMap[eventNameToWrap].get(cb);\n    this._eventMap[eventNameToWrap].delete(cb);\n    if (this._eventMap[eventNameToWrap].size === 0) {\n      delete this._eventMap[eventNameToWrap];\n    }\n    if (Object.keys(this._eventMap).length === 0) {\n      delete this._eventMap;\n    }\n    return nativeRemoveEventListener.apply(this, [nativeEventName,\n      unwrappedCb]);\n  };\n\n  Object.defineProperty(proto, 'on' + eventNameToWrap, {\n    get() {\n      return this['_on' + eventNameToWrap];\n    },\n    set(cb) {\n      if (this['_on' + eventNameToWrap]) {\n        this.removeEventListener(eventNameToWrap,\n            this['_on' + eventNameToWrap]);\n        delete this['_on' + eventNameToWrap];\n      }\n      if (cb) {\n        this.addEventListener(eventNameToWrap,\n            this['_on' + eventNameToWrap] = cb);\n      }\n    },\n    enumerable: true,\n    configurable: true\n  });\n}\n\nexport function disableLog(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + typeof bool +\n        '. Please use a boolean.');\n  }\n  logDisabled_ = bool;\n  return (bool) ? 'adapter.js logging disabled' :\n      'adapter.js logging enabled';\n}\n\n/**\n * Disable or enable deprecation warnings\n * @param {!boolean} bool set to true to disable warnings.\n */\nexport function disableWarnings(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + typeof bool +\n        '. Please use a boolean.');\n  }\n  deprecationWarnings_ = !bool;\n  return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');\n}\n\nexport function log() {\n  if (typeof window === 'object') {\n    if (logDisabled_) {\n      return;\n    }\n    if (typeof console !== 'undefined' && typeof console.log === 'function') {\n      console.log.apply(console, arguments);\n    }\n  }\n}\n\n/**\n * Shows a deprecation warning suggesting the modern and spec-compatible API.\n */\nexport function deprecated(oldMethod, newMethod) {\n  if (!deprecationWarnings_) {\n    return;\n  }\n  console.warn(oldMethod + ' is deprecated, please use ' + newMethod +\n      ' instead.');\n}\n\n/**\n * Browser detector.\n *\n * @return {object} result containing browser and version\n *     properties.\n */\nexport function detectBrowser(window) {\n  // Returned result object.\n  const result = {browser: null, version: null};\n\n  // Fail early if it's not a browser\n  if (typeof window === 'undefined' || !window.navigator) {\n    result.browser = 'Not a browser.';\n    return result;\n  }\n\n  const {navigator} = window;\n\n  if (navigator.mozGetUserMedia) { // Firefox.\n    result.browser = 'firefox';\n    result.version = extractVersion(navigator.userAgent,\n        /Firefox\\/(\\d+)\\./, 1);\n  } else if (navigator.webkitGetUserMedia ||\n      (window.isSecureContext === false && window.webkitRTCPeerConnection &&\n       !window.RTCIceGatherer)) {\n    // Chrome, Chromium, Webview, Opera.\n    // Version matches Chrome/WebRTC version.\n    // Chrome 74 removed webkitGetUserMedia on http as well so we need the\n    // more complicated fallback to webkitRTCPeerConnection.\n    result.browser = 'chrome';\n    result.version = extractVersion(navigator.userAgent,\n        /Chrom(e|ium)\\/(\\d+)\\./, 2);\n  } else if (navigator.mediaDevices &&\n      navigator.userAgent.match(/Edge\\/(\\d+).(\\d+)$/)) { // Edge.\n    result.browser = 'edge';\n    result.version = extractVersion(navigator.userAgent,\n        /Edge\\/(\\d+).(\\d+)$/, 2);\n  } else if (window.RTCPeerConnection &&\n      navigator.userAgent.match(/AppleWebKit\\/(\\d+)\\./)) { // Safari.\n    result.browser = 'safari';\n    result.version = extractVersion(navigator.userAgent,\n        /AppleWebKit\\/(\\d+)\\./, 1);\n    result.supportsUnifiedPlan = window.RTCRtpTransceiver &&\n        'currentDirection' in window.RTCRtpTransceiver.prototype;\n  } else { // Default fallthrough: not supported.\n    result.browser = 'Not a supported browser.';\n    return result;\n  }\n\n  return result;\n}\n\n/**\n * Checks if something is an object.\n *\n * @param {*} val The something you want to check.\n * @return true if val is an object, false otherwise.\n */\nfunction isObject(val) {\n  return Object.prototype.toString.call(val) === '[object Object]';\n}\n\n/**\n * Remove all empty objects and undefined values\n * from a nested object -- an enhanced and vanilla version\n * of Lodash's `compact`.\n */\nexport function compactObject(data) {\n  if (!isObject(data)) {\n    return data;\n  }\n\n  return Object.keys(data).reduce(function(accumulator, key) {\n    const isObj = isObject(data[key]);\n    const value = isObj ? compactObject(data[key]) : data[key];\n    const isEmptyObject = isObj && !Object.keys(value).length;\n    if (value === undefined || isEmptyObject) {\n      return accumulator;\n    }\n    return Object.assign(accumulator, {[key]: value});\n  }, {});\n}\n\n/* iterates the stats graph recursively. */\nexport function walkStats(stats, base, resultSet) {\n  if (!base || resultSet.has(base.id)) {\n    return;\n  }\n  resultSet.set(base.id, base);\n  Object.keys(base).forEach(name => {\n    if (name.endsWith('Id')) {\n      walkStats(stats, stats.get(base[name]), resultSet);\n    } else if (name.endsWith('Ids')) {\n      base[name].forEach(id => {\n        walkStats(stats, stats.get(id), resultSet);\n      });\n    }\n  });\n}\n\n/* filter getStats for a sender/receiver track. */\nexport function filterStats(result, track, outbound) {\n  const streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';\n  const filteredResult = new Map();\n  if (track === null) {\n    return filteredResult;\n  }\n  const trackStats = [];\n  result.forEach(value => {\n    if (value.type === 'track' &&\n        value.trackIdentifier === track.id) {\n      trackStats.push(value);\n    }\n  });\n  trackStats.forEach(trackStat => {\n    result.forEach(stats => {\n      if (stats.type === streamStatsType && stats.trackId === trackStat.id) {\n        walkStats(result, stats, filteredResult);\n      }\n    });\n  });\n  return filteredResult;\n}\n\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\nimport * as utils from '../utils.js';\nconst logging = utils.log;\n\nexport function shimGetUserMedia(window, browserDetails) {\n  const navigator = window && window.navigator;\n\n  if (!navigator.mediaDevices) {\n    return;\n  }\n\n  const constraintsToChrome_ = function(c) {\n    if (typeof c !== 'object' || c.mandatory || c.optional) {\n      return c;\n    }\n    const cc = {};\n    Object.keys(c).forEach(key => {\n      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {\n        return;\n      }\n      const r = (typeof c[key] === 'object') ? c[key] : {ideal: c[key]};\n      if (r.exact !== undefined && typeof r.exact === 'number') {\n        r.min = r.max = r.exact;\n      }\n      const oldname_ = function(prefix, name) {\n        if (prefix) {\n          return prefix + name.charAt(0).toUpperCase() + name.slice(1);\n        }\n        return (name === 'deviceId') ? 'sourceId' : name;\n      };\n      if (r.ideal !== undefined) {\n        cc.optional = cc.optional || [];\n        let oc = {};\n        if (typeof r.ideal === 'number') {\n          oc[oldname_('min', key)] = r.ideal;\n          cc.optional.push(oc);\n          oc = {};\n          oc[oldname_('max', key)] = r.ideal;\n          cc.optional.push(oc);\n        } else {\n          oc[oldname_('', key)] = r.ideal;\n          cc.optional.push(oc);\n        }\n      }\n      if (r.exact !== undefined && typeof r.exact !== 'number') {\n        cc.mandatory = cc.mandatory || {};\n        cc.mandatory[oldname_('', key)] = r.exact;\n      } else {\n        ['min', 'max'].forEach(mix => {\n          if (r[mix] !== undefined) {\n            cc.mandatory = cc.mandatory || {};\n            cc.mandatory[oldname_(mix, key)] = r[mix];\n          }\n        });\n      }\n    });\n    if (c.advanced) {\n      cc.optional = (cc.optional || []).concat(c.advanced);\n    }\n    return cc;\n  };\n\n  const shimConstraints_ = function(constraints, func) {\n    if (browserDetails.version >= 61) {\n      return func(constraints);\n    }\n    constraints = JSON.parse(JSON.stringify(constraints));\n    if (constraints && typeof constraints.audio === 'object') {\n      const remap = function(obj, a, b) {\n        if (a in obj && !(b in obj)) {\n          obj[b] = obj[a];\n          delete obj[a];\n        }\n      };\n      constraints = JSON.parse(JSON.stringify(constraints));\n      remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');\n      remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');\n      constraints.audio = constraintsToChrome_(constraints.audio);\n    }\n    if (constraints && typeof constraints.video === 'object') {\n      // Shim facingMode for mobile & surface pro.\n      let face = constraints.video.facingMode;\n      face = face && ((typeof face === 'object') ? face : {ideal: face});\n      const getSupportedFacingModeLies = browserDetails.version < 66;\n\n      if ((face && (face.exact === 'user' || face.exact === 'environment' ||\n                    face.ideal === 'user' || face.ideal === 'environment')) &&\n          !(navigator.mediaDevices.getSupportedConstraints &&\n            navigator.mediaDevices.getSupportedConstraints().facingMode &&\n            !getSupportedFacingModeLies)) {\n        delete constraints.video.facingMode;\n        let matches;\n        if (face.exact === 'environment' || face.ideal === 'environment') {\n          matches = ['back', 'rear'];\n        } else if (face.exact === 'user' || face.ideal === 'user') {\n          matches = ['front'];\n        }\n        if (matches) {\n          // Look for matches in label, or use last cam for back (typical).\n          return navigator.mediaDevices.enumerateDevices()\n          .then(devices => {\n            devices = devices.filter(d => d.kind === 'videoinput');\n            let dev = devices.find(d => matches.some(match =>\n              d.label.toLowerCase().includes(match)));\n            if (!dev && devices.length && matches.includes('back')) {\n              dev = devices[devices.length - 1]; // more likely the back cam\n            }\n            if (dev) {\n              constraints.video.deviceId = face.exact ? {exact: dev.deviceId} :\n                                                        {ideal: dev.deviceId};\n            }\n            constraints.video = constraintsToChrome_(constraints.video);\n            logging('chrome: ' + JSON.stringify(constraints));\n            return func(constraints);\n          });\n        }\n      }\n      constraints.video = constraintsToChrome_(constraints.video);\n    }\n    logging('chrome: ' + JSON.stringify(constraints));\n    return func(constraints);\n  };\n\n  const shimError_ = function(e) {\n    if (browserDetails.version >= 64) {\n      return e;\n    }\n    return {\n      name: {\n        PermissionDeniedError: 'NotAllowedError',\n        PermissionDismissedError: 'NotAllowedError',\n        InvalidStateError: 'NotAllowedError',\n        DevicesNotFoundError: 'NotFoundError',\n        ConstraintNotSatisfiedError: 'OverconstrainedError',\n        TrackStartError: 'NotReadableError',\n        MediaDeviceFailedDueToShutdown: 'NotAllowedError',\n        MediaDeviceKillSwitchOn: 'NotAllowedError',\n        TabCaptureError: 'AbortError',\n        ScreenCaptureError: 'AbortError',\n        DeviceCaptureError: 'AbortError'\n      }[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint || e.constraintName,\n      toString() {\n        return this.name + (this.message && ': ') + this.message;\n      }\n    };\n  };\n\n  const getUserMedia_ = function(constraints, onSuccess, onError) {\n    shimConstraints_(constraints, c => {\n      navigator.webkitGetUserMedia(c, onSuccess, e => {\n        if (onError) {\n          onError(shimError_(e));\n        }\n      });\n    });\n  };\n  navigator.getUserMedia = getUserMedia_.bind(navigator);\n\n  // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia\n  // function which returns a Promise, it does not accept spec-style\n  // constraints.\n  if (navigator.mediaDevices.getUserMedia) {\n    const origGetUserMedia = navigator.mediaDevices.getUserMedia.\n        bind(navigator.mediaDevices);\n    navigator.mediaDevices.getUserMedia = function(cs) {\n      return shimConstraints_(cs, c => origGetUserMedia(c).then(stream => {\n        if (c.audio && !stream.getAudioTracks().length ||\n            c.video && !stream.getVideoTracks().length) {\n          stream.getTracks().forEach(track => {\n            track.stop();\n          });\n          throw new DOMException('', 'NotFoundError');\n        }\n        return stream;\n      }, e => Promise.reject(shimError_(e))));\n    };\n  }\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\nexport function shimGetDisplayMedia(window, getSourceId) {\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  // getSourceId is a function that returns a promise resolving with\n  // the sourceId of the screen/window/tab to be shared.\n  if (typeof getSourceId !== 'function') {\n    console.error('shimGetDisplayMedia: getSourceId argument is not ' +\n        'a function');\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    function getDisplayMedia(constraints) {\n      return getSourceId(constraints)\n        .then(sourceId => {\n          const widthSpecified = constraints.video && constraints.video.width;\n          const heightSpecified = constraints.video &&\n            constraints.video.height;\n          const frameRateSpecified = constraints.video &&\n            constraints.video.frameRate;\n          constraints.video = {\n            mandatory: {\n              chromeMediaSource: 'desktop',\n              chromeMediaSourceId: sourceId,\n              maxFrameRate: frameRateSpecified || 3\n            }\n          };\n          if (widthSpecified) {\n            constraints.video.mandatory.maxWidth = widthSpecified;\n          }\n          if (heightSpecified) {\n            constraints.video.mandatory.maxHeight = heightSpecified;\n          }\n          return window.navigator.mediaDevices.getUserMedia(constraints);\n        });\n    };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\nimport * as utils from '../utils.js';\n\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimMediaStream(window) {\n  window.MediaStream = window.MediaStream || window.webkitMediaStream;\n}\n\nexport function shimOnTrack(window) {\n  if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in\n      window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {\n      get() {\n        return this._ontrack;\n      },\n      set(f) {\n        if (this._ontrack) {\n          this.removeEventListener('track', this._ontrack);\n        }\n        this.addEventListener('track', this._ontrack = f);\n      },\n      enumerable: true,\n      configurable: true\n    });\n    const origSetRemoteDescription =\n        window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription =\n      function setRemoteDescription() {\n        if (!this._ontrackpoly) {\n          this._ontrackpoly = (e) => {\n            // onaddstream does not fire when a track is added to an existing\n            // stream. But stream.onaddtrack is implemented so we use that.\n            e.stream.addEventListener('addtrack', te => {\n              let receiver;\n              if (window.RTCPeerConnection.prototype.getReceivers) {\n                receiver = this.getReceivers()\n                  .find(r => r.track && r.track.id === te.track.id);\n              } else {\n                receiver = {track: te.track};\n              }\n\n              const event = new Event('track');\n              event.track = te.track;\n              event.receiver = receiver;\n              event.transceiver = {receiver};\n              event.streams = [e.stream];\n              this.dispatchEvent(event);\n            });\n            e.stream.getTracks().forEach(track => {\n              let receiver;\n              if (window.RTCPeerConnection.prototype.getReceivers) {\n                receiver = this.getReceivers()\n                  .find(r => r.track && r.track.id === track.id);\n              } else {\n                receiver = {track};\n              }\n              const event = new Event('track');\n              event.track = track;\n              event.receiver = receiver;\n              event.transceiver = {receiver};\n              event.streams = [e.stream];\n              this.dispatchEvent(event);\n            });\n          };\n          this.addEventListener('addstream', this._ontrackpoly);\n        }\n        return origSetRemoteDescription.apply(this, arguments);\n      };\n  } else {\n    // even if RTCRtpTransceiver is in window, it is only used and\n    // emitted in unified-plan. Unfortunately this means we need\n    // to unconditionally wrap the event.\n    utils.wrapPeerConnectionEvent(window, 'track', e => {\n      if (!e.transceiver) {\n        Object.defineProperty(e, 'transceiver',\n          {value: {receiver: e.receiver}});\n      }\n      return e;\n    });\n  }\n}\n\nexport function shimGetSendersWithDtmf(window) {\n  // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.\n  if (typeof window === 'object' && window.RTCPeerConnection &&\n      !('getSenders' in window.RTCPeerConnection.prototype) &&\n      'createDTMFSender' in window.RTCPeerConnection.prototype) {\n    const shimSenderWithDtmf = function(pc, track) {\n      return {\n        track,\n        get dtmf() {\n          if (this._dtmf === undefined) {\n            if (track.kind === 'audio') {\n              this._dtmf = pc.createDTMFSender(track);\n            } else {\n              this._dtmf = null;\n            }\n          }\n          return this._dtmf;\n        },\n        _pc: pc\n      };\n    };\n\n    // augment addTrack when getSenders is not available.\n    if (!window.RTCPeerConnection.prototype.getSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n        this._senders = this._senders || [];\n        return this._senders.slice(); // return a copy of the internal state.\n      };\n      const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n      window.RTCPeerConnection.prototype.addTrack =\n        function addTrack(track, stream) {\n          let sender = origAddTrack.apply(this, arguments);\n          if (!sender) {\n            sender = shimSenderWithDtmf(this, track);\n            this._senders.push(sender);\n          }\n          return sender;\n        };\n\n      const origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n      window.RTCPeerConnection.prototype.removeTrack =\n        function removeTrack(sender) {\n          origRemoveTrack.apply(this, arguments);\n          const idx = this._senders.indexOf(sender);\n          if (idx !== -1) {\n            this._senders.splice(idx, 1);\n          }\n        };\n    }\n    const origAddStream = window.RTCPeerConnection.prototype.addStream;\n    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n      this._senders = this._senders || [];\n      origAddStream.apply(this, [stream]);\n      stream.getTracks().forEach(track => {\n        this._senders.push(shimSenderWithDtmf(this, track));\n      });\n    };\n\n    const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n    window.RTCPeerConnection.prototype.removeStream =\n      function removeStream(stream) {\n        this._senders = this._senders || [];\n        origRemoveStream.apply(this, [stream]);\n\n        stream.getTracks().forEach(track => {\n          const sender = this._senders.find(s => s.track === track);\n          if (sender) { // remove sender\n            this._senders.splice(this._senders.indexOf(sender), 1);\n          }\n        });\n      };\n  } else if (typeof window === 'object' && window.RTCPeerConnection &&\n             'getSenders' in window.RTCPeerConnection.prototype &&\n             'createDTMFSender' in window.RTCPeerConnection.prototype &&\n             window.RTCRtpSender &&\n             !('dtmf' in window.RTCRtpSender.prototype)) {\n    const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n      const senders = origGetSenders.apply(this, []);\n      senders.forEach(sender => sender._pc = this);\n      return senders;\n    };\n\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = this._pc.createDTMFSender(this.track);\n          } else {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n}\n\nexport function shimGetStats(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  const origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    const [selector, onSucc, onErr] = arguments;\n\n    // If selector is a function then we are in the old style stats so just\n    // pass back the original getStats format to avoid breaking old users.\n    if (arguments.length > 0 && typeof selector === 'function') {\n      return origGetStats.apply(this, arguments);\n    }\n\n    // When spec-style getStats is supported, return those when called with\n    // either no arguments or the selector argument is null.\n    if (origGetStats.length === 0 && (arguments.length === 0 ||\n        typeof selector !== 'function')) {\n      return origGetStats.apply(this, []);\n    }\n\n    const fixChromeStats_ = function(response) {\n      const standardReport = {};\n      const reports = response.result();\n      reports.forEach(report => {\n        const standardStats = {\n          id: report.id,\n          timestamp: report.timestamp,\n          type: {\n            localcandidate: 'local-candidate',\n            remotecandidate: 'remote-candidate'\n          }[report.type] || report.type\n        };\n        report.names().forEach(name => {\n          standardStats[name] = report.stat(name);\n        });\n        standardReport[standardStats.id] = standardStats;\n      });\n\n      return standardReport;\n    };\n\n    // shim getStats with maplike support\n    const makeMapStats = function(stats) {\n      return new Map(Object.keys(stats).map(key => [key, stats[key]]));\n    };\n\n    if (arguments.length >= 2) {\n      const successCallbackWrapper_ = function(response) {\n        onSucc(makeMapStats(fixChromeStats_(response)));\n      };\n\n      return origGetStats.apply(this, [successCallbackWrapper_,\n        selector]);\n    }\n\n    // promise-support\n    return new Promise((resolve, reject) => {\n      origGetStats.apply(this, [\n        function(response) {\n          resolve(makeMapStats(fixChromeStats_(response)));\n        }, reject]);\n    }).then(onSucc, onErr);\n  };\n}\n\nexport function shimSenderReceiverGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender && window.RTCRtpReceiver)) {\n    return;\n  }\n\n  // shim sender stats.\n  if (!('getStats' in window.RTCRtpSender.prototype)) {\n    const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    if (origGetSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n        const senders = origGetSenders.apply(this, []);\n        senders.forEach(sender => sender._pc = this);\n        return senders;\n      };\n    }\n\n    const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n    if (origAddTrack) {\n      window.RTCPeerConnection.prototype.addTrack = function addTrack() {\n        const sender = origAddTrack.apply(this, arguments);\n        sender._pc = this;\n        return sender;\n      };\n    }\n    window.RTCRtpSender.prototype.getStats = function getStats() {\n      const sender = this;\n      return this._pc.getStats().then(result =>\n        /* Note: this will include stats of all senders that\n         *   send a track with the same id as sender.track as\n         *   it is not possible to identify the RTCRtpSender.\n         */\n        utils.filterStats(result, sender.track, true));\n    };\n  }\n\n  // shim receiver stats.\n  if (!('getStats' in window.RTCRtpReceiver.prototype)) {\n    const origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n    if (origGetReceivers) {\n      window.RTCPeerConnection.prototype.getReceivers =\n        function getReceivers() {\n          const receivers = origGetReceivers.apply(this, []);\n          receivers.forEach(receiver => receiver._pc = this);\n          return receivers;\n        };\n    }\n    utils.wrapPeerConnectionEvent(window, 'track', e => {\n      e.receiver._pc = e.srcElement;\n      return e;\n    });\n    window.RTCRtpReceiver.prototype.getStats = function getStats() {\n      const receiver = this;\n      return this._pc.getStats().then(result =>\n        utils.filterStats(result, receiver.track, false));\n    };\n  }\n\n  if (!('getStats' in window.RTCRtpSender.prototype &&\n      'getStats' in window.RTCRtpReceiver.prototype)) {\n    return;\n  }\n\n  // shim RTCPeerConnection.getStats(track).\n  const origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    if (arguments.length > 0 &&\n        arguments[0] instanceof window.MediaStreamTrack) {\n      const track = arguments[0];\n      let sender;\n      let receiver;\n      let err;\n      this.getSenders().forEach(s => {\n        if (s.track === track) {\n          if (sender) {\n            err = true;\n          } else {\n            sender = s;\n          }\n        }\n      });\n      this.getReceivers().forEach(r => {\n        if (r.track === track) {\n          if (receiver) {\n            err = true;\n          } else {\n            receiver = r;\n          }\n        }\n        return r.track === track;\n      });\n      if (err || (sender && receiver)) {\n        return Promise.reject(new DOMException(\n          'There are more than one sender or receiver for the track.',\n          'InvalidAccessError'));\n      } else if (sender) {\n        return sender.getStats();\n      } else if (receiver) {\n        return receiver.getStats();\n      }\n      return Promise.reject(new DOMException(\n        'There is no sender or receiver for the track.',\n        'InvalidAccessError'));\n    }\n    return origGetStats.apply(this, arguments);\n  };\n}\n\nexport function shimAddTrackRemoveTrackWithNative(window) {\n  // shim addTrack/removeTrack with native variants in order to make\n  // the interactions with legacy getLocalStreams behave as in other browsers.\n  // Keeps a mapping stream.id => [stream, rtpsenders...]\n  window.RTCPeerConnection.prototype.getLocalStreams =\n    function getLocalStreams() {\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n      return Object.keys(this._shimmedLocalStreams)\n        .map(streamId => this._shimmedLocalStreams[streamId][0]);\n    };\n\n  const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  window.RTCPeerConnection.prototype.addTrack =\n    function addTrack(track, stream) {\n      if (!stream) {\n        return origAddTrack.apply(this, arguments);\n      }\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n      const sender = origAddTrack.apply(this, arguments);\n      if (!this._shimmedLocalStreams[stream.id]) {\n        this._shimmedLocalStreams[stream.id] = [stream, sender];\n      } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {\n        this._shimmedLocalStreams[stream.id].push(sender);\n      }\n      return sender;\n    };\n\n  const origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n    stream.getTracks().forEach(track => {\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n    });\n    const existingSenders = this.getSenders();\n    origAddStream.apply(this, arguments);\n    const newSenders = this.getSenders()\n      .filter(newSender => existingSenders.indexOf(newSender) === -1);\n    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);\n  };\n\n  const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream =\n    function removeStream(stream) {\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n      delete this._shimmedLocalStreams[stream.id];\n      return origRemoveStream.apply(this, arguments);\n    };\n\n  const origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n  window.RTCPeerConnection.prototype.removeTrack =\n    function removeTrack(sender) {\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n      if (sender) {\n        Object.keys(this._shimmedLocalStreams).forEach(streamId => {\n          const idx = this._shimmedLocalStreams[streamId].indexOf(sender);\n          if (idx !== -1) {\n            this._shimmedLocalStreams[streamId].splice(idx, 1);\n          }\n          if (this._shimmedLocalStreams[streamId].length === 1) {\n            delete this._shimmedLocalStreams[streamId];\n          }\n        });\n      }\n      return origRemoveTrack.apply(this, arguments);\n    };\n}\n\nexport function shimAddTrackRemoveTrack(window, browserDetails) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  // shim addTrack and removeTrack.\n  if (window.RTCPeerConnection.prototype.addTrack &&\n      browserDetails.version >= 65) {\n    return shimAddTrackRemoveTrackWithNative(window);\n  }\n\n  // also shim pc.getLocalStreams when addTrack is shimmed\n  // to return the original streams.\n  const origGetLocalStreams = window.RTCPeerConnection.prototype\n      .getLocalStreams;\n  window.RTCPeerConnection.prototype.getLocalStreams =\n    function getLocalStreams() {\n      const nativeStreams = origGetLocalStreams.apply(this);\n      this._reverseStreams = this._reverseStreams || {};\n      return nativeStreams.map(stream => this._reverseStreams[stream.id]);\n    };\n\n  const origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n\n    stream.getTracks().forEach(track => {\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n    });\n    // Add identity mapping for consistency with addTrack.\n    // Unless this is being used with a stream from addTrack.\n    if (!this._reverseStreams[stream.id]) {\n      const newStream = new window.MediaStream(stream.getTracks());\n      this._streams[stream.id] = newStream;\n      this._reverseStreams[newStream.id] = stream;\n      stream = newStream;\n    }\n    origAddStream.apply(this, [stream]);\n  };\n\n  const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream =\n    function removeStream(stream) {\n      this._streams = this._streams || {};\n      this._reverseStreams = this._reverseStreams || {};\n\n      origRemoveStream.apply(this, [(this._streams[stream.id] || stream)]);\n      delete this._reverseStreams[(this._streams[stream.id] ?\n          this._streams[stream.id].id : stream.id)];\n      delete this._streams[stream.id];\n    };\n\n  window.RTCPeerConnection.prototype.addTrack =\n    function addTrack(track, stream) {\n      if (this.signalingState === 'closed') {\n        throw new DOMException(\n          'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n          'InvalidStateError');\n      }\n      const streams = [].slice.call(arguments, 1);\n      if (streams.length !== 1 ||\n          !streams[0].getTracks().find(t => t === track)) {\n        // this is not fully correct but all we can manage without\n        // [[associated MediaStreams]] internal slot.\n        throw new DOMException(\n          'The adapter.js addTrack polyfill only supports a single ' +\n          ' stream which is associated with the specified track.',\n          'NotSupportedError');\n      }\n\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n\n      this._streams = this._streams || {};\n      this._reverseStreams = this._reverseStreams || {};\n      const oldStream = this._streams[stream.id];\n      if (oldStream) {\n        // this is using odd Chrome behaviour, use with caution:\n        // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815\n        // Note: we rely on the high-level addTrack/dtmf shim to\n        // create the sender with a dtmf sender.\n        oldStream.addTrack(track);\n\n        // Trigger ONN async.\n        Promise.resolve().then(() => {\n          this.dispatchEvent(new Event('negotiationneeded'));\n        });\n      } else {\n        const newStream = new window.MediaStream([track]);\n        this._streams[stream.id] = newStream;\n        this._reverseStreams[newStream.id] = stream;\n        this.addStream(newStream);\n      }\n      return this.getSenders().find(s => s.track === track);\n    };\n\n  // replace the internal stream id with the external one and\n  // vice versa.\n  function replaceInternalStreamId(pc, description) {\n    let sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(internalId => {\n      const externalStream = pc._reverseStreams[internalId];\n      const internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(internalStream.id, 'g'),\n          externalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp\n    });\n  }\n  function replaceExternalStreamId(pc, description) {\n    let sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(internalId => {\n      const externalStream = pc._reverseStreams[internalId];\n      const internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(externalStream.id, 'g'),\n          internalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp\n    });\n  }\n  ['createOffer', 'createAnswer'].forEach(function(method) {\n    const nativeMethod = window.RTCPeerConnection.prototype[method];\n    const methodObj = {[method]() {\n      const args = arguments;\n      const isLegacyCall = arguments.length &&\n          typeof arguments[0] === 'function';\n      if (isLegacyCall) {\n        return nativeMethod.apply(this, [\n          (description) => {\n            const desc = replaceInternalStreamId(this, description);\n            args[0].apply(null, [desc]);\n          },\n          (err) => {\n            if (args[1]) {\n              args[1].apply(null, err);\n            }\n          }, arguments[2]\n        ]);\n      }\n      return nativeMethod.apply(this, arguments)\n      .then(description => replaceInternalStreamId(this, description));\n    }};\n    window.RTCPeerConnection.prototype[method] = methodObj[method];\n  });\n\n  const origSetLocalDescription =\n      window.RTCPeerConnection.prototype.setLocalDescription;\n  window.RTCPeerConnection.prototype.setLocalDescription =\n    function setLocalDescription() {\n      if (!arguments.length || !arguments[0].type) {\n        return origSetLocalDescription.apply(this, arguments);\n      }\n      arguments[0] = replaceExternalStreamId(this, arguments[0]);\n      return origSetLocalDescription.apply(this, arguments);\n    };\n\n  // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier\n\n  const origLocalDescription = Object.getOwnPropertyDescriptor(\n      window.RTCPeerConnection.prototype, 'localDescription');\n  Object.defineProperty(window.RTCPeerConnection.prototype,\n      'localDescription', {\n        get() {\n          const description = origLocalDescription.get.apply(this);\n          if (description.type === '') {\n            return description;\n          }\n          return replaceInternalStreamId(this, description);\n        }\n      });\n\n  window.RTCPeerConnection.prototype.removeTrack =\n    function removeTrack(sender) {\n      if (this.signalingState === 'closed') {\n        throw new DOMException(\n          'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n          'InvalidStateError');\n      }\n      // We can not yet check for sender instanceof RTCRtpSender\n      // since we shim RTPSender. So we check if sender._pc is set.\n      if (!sender._pc) {\n        throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' +\n            'does not implement interface RTCRtpSender.', 'TypeError');\n      }\n      const isLocal = sender._pc === this;\n      if (!isLocal) {\n        throw new DOMException('Sender was not created by this connection.',\n            'InvalidAccessError');\n      }\n\n      // Search for the native stream the senders track belongs to.\n      this._streams = this._streams || {};\n      let stream;\n      Object.keys(this._streams).forEach(streamid => {\n        const hasTrack = this._streams[streamid].getTracks()\n          .find(track => sender.track === track);\n        if (hasTrack) {\n          stream = this._streams[streamid];\n        }\n      });\n\n      if (stream) {\n        if (stream.getTracks().length === 1) {\n          // if this is the last track of the stream, remove the stream. This\n          // takes care of any shimmed _senders.\n          this.removeStream(this._reverseStreams[stream.id]);\n        } else {\n          // relying on the same odd chrome behaviour as above.\n          stream.removeTrack(sender.track);\n        }\n        this.dispatchEvent(new Event('negotiationneeded'));\n      }\n    };\n}\n\nexport function shimPeerConnection(window, browserDetails) {\n  if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.webkitRTCPeerConnection;\n  }\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  // shim implicit creation of RTCSessionDescription/RTCIceCandidate\n  if (browserDetails.version < 53) {\n    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n        .forEach(function(method) {\n          const nativeMethod = window.RTCPeerConnection.prototype[method];\n          const methodObj = {[method]() {\n            arguments[0] = new ((method === 'addIceCandidate') ?\n                window.RTCIceCandidate :\n                window.RTCSessionDescription)(arguments[0]);\n            return nativeMethod.apply(this, arguments);\n          }};\n          window.RTCPeerConnection.prototype[method] = methodObj[method];\n        });\n  }\n}\n\n// Attempt to fix ONN in plan-b mode.\nexport function fixNegotiationNeeded(window, browserDetails) {\n  utils.wrapPeerConnectionEvent(window, 'negotiationneeded', e => {\n    const pc = e.target;\n    if (browserDetails.version < 72 || (pc.getConfiguration &&\n        pc.getConfiguration().sdpSemantics === 'plan-b')) {\n      if (pc.signalingState !== 'stable') {\n        return;\n      }\n    }\n    return e;\n  });\n}\n","/*\n *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nexport function filterIceServers(iceServers, edgeVersion) {\n  let hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(server => {\n    if (server && (server.urls || server.url)) {\n      let urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n      }\n      const isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(url => {\n        // filter STUN unconditionally.\n        if (url.indexOf('stun:') === 0) {\n          return false;\n        }\n\n        const validTurn = url.startsWith('turn') &&\n            !url.startsWith('turn:[') &&\n            url.includes('transport=udp');\n        if (validTurn && !hasTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return validTurn && !hasTurn;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n","/* eslint-env node */\n'use strict';\n\n// SDP helpers.\nvar SDPUtils = {};\n\n// Generate an alphanumeric identifier for cname or mids.\n// TODO: use UUIDs instead? https://gist.github.com/jed/982883\nSDPUtils.generateIdentifier = function() {\n  return Math.random().toString(36).substr(2, 10);\n};\n\n// The RTCP CNAME used by all peerconnections from the same JS.\nSDPUtils.localCName = SDPUtils.generateIdentifier();\n\n// Splits SDP into lines, dealing with both CRLF and LF.\nSDPUtils.splitLines = function(blob) {\n  return blob.trim().split('\\n').map(function(line) {\n    return line.trim();\n  });\n};\n// Splits SDP into sessionpart and mediasections. Ensures CRLF.\nSDPUtils.splitSections = function(blob) {\n  var parts = blob.split('\\nm=');\n  return parts.map(function(part, index) {\n    return (index > 0 ? 'm=' + part : part).trim() + '\\r\\n';\n  });\n};\n\n// returns the session description.\nSDPUtils.getDescription = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  return sections && sections[0];\n};\n\n// returns the individual media sections.\nSDPUtils.getMediaSections = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  sections.shift();\n  return sections;\n};\n\n// Returns lines that start with a certain prefix.\nSDPUtils.matchPrefix = function(blob, prefix) {\n  return SDPUtils.splitLines(blob).filter(function(line) {\n    return line.indexOf(prefix) === 0;\n  });\n};\n\n// Parses an ICE candidate line. Sample input:\n// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8\n// rport 55996\"\nSDPUtils.parseCandidate = function(line) {\n  var parts;\n  // Parse both variants.\n  if (line.indexOf('a=candidate:') === 0) {\n    parts = line.substring(12).split(' ');\n  } else {\n    parts = line.substring(10).split(' ');\n  }\n\n  var candidate = {\n    foundation: parts[0],\n    component: parseInt(parts[1], 10),\n    protocol: parts[2].toLowerCase(),\n    priority: parseInt(parts[3], 10),\n    ip: parts[4],\n    address: parts[4], // address is an alias for ip.\n    port: parseInt(parts[5], 10),\n    // skip parts[6] == 'typ'\n    type: parts[7]\n  };\n\n  for (var i = 8; i < parts.length; i += 2) {\n    switch (parts[i]) {\n      case 'raddr':\n        candidate.relatedAddress = parts[i + 1];\n        break;\n      case 'rport':\n        candidate.relatedPort = parseInt(parts[i + 1], 10);\n        break;\n      case 'tcptype':\n        candidate.tcpType = parts[i + 1];\n        break;\n      case 'ufrag':\n        candidate.ufrag = parts[i + 1]; // for backward compability.\n        candidate.usernameFragment = parts[i + 1];\n        break;\n      default: // extension handling, in particular ufrag\n        candidate[parts[i]] = parts[i + 1];\n        break;\n    }\n  }\n  return candidate;\n};\n\n// Translates a candidate object into SDP candidate attribute.\nSDPUtils.writeCandidate = function(candidate) {\n  var sdp = [];\n  sdp.push(candidate.foundation);\n  sdp.push(candidate.component);\n  sdp.push(candidate.protocol.toUpperCase());\n  sdp.push(candidate.priority);\n  sdp.push(candidate.address || candidate.ip);\n  sdp.push(candidate.port);\n\n  var type = candidate.type;\n  sdp.push('typ');\n  sdp.push(type);\n  if (type !== 'host' && candidate.relatedAddress &&\n      candidate.relatedPort) {\n    sdp.push('raddr');\n    sdp.push(candidate.relatedAddress);\n    sdp.push('rport');\n    sdp.push(candidate.relatedPort);\n  }\n  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {\n    sdp.push('tcptype');\n    sdp.push(candidate.tcpType);\n  }\n  if (candidate.usernameFragment || candidate.ufrag) {\n    sdp.push('ufrag');\n    sdp.push(candidate.usernameFragment || candidate.ufrag);\n  }\n  return 'candidate:' + sdp.join(' ');\n};\n\n// Parses an ice-options line, returns an array of option tags.\n// a=ice-options:foo bar\nSDPUtils.parseIceOptions = function(line) {\n  return line.substr(14).split(' ');\n};\n\n// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:\n// a=rtpmap:111 opus/48000/2\nSDPUtils.parseRtpMap = function(line) {\n  var parts = line.substr(9).split(' ');\n  var parsed = {\n    payloadType: parseInt(parts.shift(), 10) // was: id\n  };\n\n  parts = parts[0].split('/');\n\n  parsed.name = parts[0];\n  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate\n  parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;\n  // legacy alias, got renamed back to channels in ORTC.\n  parsed.numChannels = parsed.channels;\n  return parsed;\n};\n\n// Generate an a=rtpmap line from RTCRtpCodecCapability or\n// RTCRtpCodecParameters.\nSDPUtils.writeRtpMap = function(codec) {\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  var channels = codec.channels || codec.numChannels || 1;\n  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +\n      (channels !== 1 ? '/' + channels : '') + '\\r\\n';\n};\n\n// Parses an a=extmap line (headerextension from RFC 5285). Sample input:\n// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset\n// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset\nSDPUtils.parseExtmap = function(line) {\n  var parts = line.substr(9).split(' ');\n  return {\n    id: parseInt(parts[0], 10),\n    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',\n    uri: parts[1]\n  };\n};\n\n// Generates a=extmap line from RTCRtpHeaderExtensionParameters or\n// RTCRtpHeaderExtension.\nSDPUtils.writeExtmap = function(headerExtension) {\n  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +\n      (headerExtension.direction && headerExtension.direction !== 'sendrecv'\n        ? '/' + headerExtension.direction\n        : '') +\n      ' ' + headerExtension.uri + '\\r\\n';\n};\n\n// Parses an ftmp line, returns dictionary. Sample input:\n// a=fmtp:96 vbr=on;cng=on\n// Also deals with vbr=on; cng=on\nSDPUtils.parseFmtp = function(line) {\n  var parsed = {};\n  var kv;\n  var parts = line.substr(line.indexOf(' ') + 1).split(';');\n  for (var j = 0; j < parts.length; j++) {\n    kv = parts[j].trim().split('=');\n    parsed[kv[0].trim()] = kv[1];\n  }\n  return parsed;\n};\n\n// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeFmtp = function(codec) {\n  var line = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.parameters && Object.keys(codec.parameters).length) {\n    var params = [];\n    Object.keys(codec.parameters).forEach(function(param) {\n      if (codec.parameters[param]) {\n        params.push(param + '=' + codec.parameters[param]);\n      } else {\n        params.push(param);\n      }\n    });\n    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\\r\\n';\n  }\n  return line;\n};\n\n// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:\n// a=rtcp-fb:98 nack rpsi\nSDPUtils.parseRtcpFb = function(line) {\n  var parts = line.substr(line.indexOf(' ') + 1).split(' ');\n  return {\n    type: parts.shift(),\n    parameter: parts.join(' ')\n  };\n};\n// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeRtcpFb = function(codec) {\n  var lines = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {\n    // FIXME: special handling for trr-int?\n    codec.rtcpFeedback.forEach(function(fb) {\n      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +\n      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +\n          '\\r\\n';\n    });\n  }\n  return lines;\n};\n\n// Parses an RFC 5576 ssrc media attribute. Sample input:\n// a=ssrc:3735928559 cname:something\nSDPUtils.parseSsrcMedia = function(line) {\n  var sp = line.indexOf(' ');\n  var parts = {\n    ssrc: parseInt(line.substr(7, sp - 7), 10)\n  };\n  var colon = line.indexOf(':', sp);\n  if (colon > -1) {\n    parts.attribute = line.substr(sp + 1, colon - sp - 1);\n    parts.value = line.substr(colon + 1);\n  } else {\n    parts.attribute = line.substr(sp + 1);\n  }\n  return parts;\n};\n\nSDPUtils.parseSsrcGroup = function(line) {\n  var parts = line.substr(13).split(' ');\n  return {\n    semantics: parts.shift(),\n    ssrcs: parts.map(function(ssrc) {\n      return parseInt(ssrc, 10);\n    })\n  };\n};\n\n// Extracts the MID (RFC 5888) from a media section.\n// returns the MID or undefined if no mid line was found.\nSDPUtils.getMid = function(mediaSection) {\n  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];\n  if (mid) {\n    return mid.substr(6);\n  }\n};\n\nSDPUtils.parseFingerprint = function(line) {\n  var parts = line.substr(14).split(' ');\n  return {\n    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.\n    value: parts[1]\n  };\n};\n\n// Extracts DTLS parameters from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the fingerprint line as input. See also getIceParameters.\nSDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=fingerprint:');\n  // Note: a=setup line is ignored since we use the 'auto' role.\n  // Note2: 'algorithm' is not case sensitive except in Edge.\n  return {\n    role: 'auto',\n    fingerprints: lines.map(SDPUtils.parseFingerprint)\n  };\n};\n\n// Serializes DTLS parameters to SDP.\nSDPUtils.writeDtlsParameters = function(params, setupType) {\n  var sdp = 'a=setup:' + setupType + '\\r\\n';\n  params.fingerprints.forEach(function(fp) {\n    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\\r\\n';\n  });\n  return sdp;\n};\n\n// Parses a=crypto lines into\n//   https://rawgit.com/aboba/edgertc/master/msortc-rs4.html#dictionary-rtcsrtpsdesparameters-members\nSDPUtils.parseCryptoLine = function(line) {\n  var parts = line.substr(9).split(' ');\n  return {\n    tag: parseInt(parts[0], 10),\n    cryptoSuite: parts[1],\n    keyParams: parts[2],\n    sessionParams: parts.slice(3),\n  };\n};\n\nSDPUtils.writeCryptoLine = function(parameters) {\n  return 'a=crypto:' + parameters.tag + ' ' +\n    parameters.cryptoSuite + ' ' +\n    (typeof parameters.keyParams === 'object'\n      ? SDPUtils.writeCryptoKeyParams(parameters.keyParams)\n      : parameters.keyParams) +\n    (parameters.sessionParams ? ' ' + parameters.sessionParams.join(' ') : '') +\n    '\\r\\n';\n};\n\n// Parses the crypto key parameters into\n//   https://rawgit.com/aboba/edgertc/master/msortc-rs4.html#rtcsrtpkeyparam*\nSDPUtils.parseCryptoKeyParams = function(keyParams) {\n  if (keyParams.indexOf('inline:') !== 0) {\n    return null;\n  }\n  var parts = keyParams.substr(7).split('|');\n  return {\n    keyMethod: 'inline',\n    keySalt: parts[0],\n    lifeTime: parts[1],\n    mkiValue: parts[2] ? parts[2].split(':')[0] : undefined,\n    mkiLength: parts[2] ? parts[2].split(':')[1] : undefined,\n  };\n};\n\nSDPUtils.writeCryptoKeyParams = function(keyParams) {\n  return keyParams.keyMethod + ':'\n    + keyParams.keySalt +\n    (keyParams.lifeTime ? '|' + keyParams.lifeTime : '') +\n    (keyParams.mkiValue && keyParams.mkiLength\n      ? '|' + keyParams.mkiValue + ':' + keyParams.mkiLength\n      : '');\n};\n\n// Extracts all SDES paramters.\nSDPUtils.getCryptoParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=crypto:');\n  return lines.map(SDPUtils.parseCryptoLine);\n};\n\n// Parses ICE information from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the ice-ufrag and ice-pwd lines as input.\nSDPUtils.getIceParameters = function(mediaSection, sessionpart) {\n  var ufrag = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=ice-ufrag:')[0];\n  var pwd = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=ice-pwd:')[0];\n  if (!(ufrag && pwd)) {\n    return null;\n  }\n  return {\n    usernameFragment: ufrag.substr(12),\n    password: pwd.substr(10),\n  };\n};\n\n// Serializes ICE parameters to SDP.\nSDPUtils.writeIceParameters = function(params) {\n  return 'a=ice-ufrag:' + params.usernameFragment + '\\r\\n' +\n      'a=ice-pwd:' + params.password + '\\r\\n';\n};\n\n// Parses the SDP media section and returns RTCRtpParameters.\nSDPUtils.parseRtpParameters = function(mediaSection) {\n  var description = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: [],\n    rtcp: []\n  };\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]\n    var pt = mline[i];\n    var rtpmapline = SDPUtils.matchPrefix(\n      mediaSection, 'a=rtpmap:' + pt + ' ')[0];\n    if (rtpmapline) {\n      var codec = SDPUtils.parseRtpMap(rtpmapline);\n      var fmtps = SDPUtils.matchPrefix(\n        mediaSection, 'a=fmtp:' + pt + ' ');\n      // Only the first a=fmtp:<pt> is considered.\n      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};\n      codec.rtcpFeedback = SDPUtils.matchPrefix(\n        mediaSection, 'a=rtcp-fb:' + pt + ' ')\n        .map(SDPUtils.parseRtcpFb);\n      description.codecs.push(codec);\n      // parse FEC mechanisms from rtpmap lines.\n      switch (codec.name.toUpperCase()) {\n        case 'RED':\n        case 'ULPFEC':\n          description.fecMechanisms.push(codec.name.toUpperCase());\n          break;\n        default: // only RED and ULPFEC are recognized as FEC mechanisms.\n          break;\n      }\n    }\n  }\n  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {\n    description.headerExtensions.push(SDPUtils.parseExtmap(line));\n  });\n  // FIXME: parse rtcp.\n  return description;\n};\n\n// Generates parts of the SDP media section describing the capabilities /\n// parameters.\nSDPUtils.writeRtpDescription = function(kind, caps) {\n  var sdp = '';\n\n  // Build the mline.\n  sdp += 'm=' + kind + ' ';\n  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.\n  sdp += ' UDP/TLS/RTP/SAVPF ';\n  sdp += caps.codecs.map(function(codec) {\n    if (codec.preferredPayloadType !== undefined) {\n      return codec.preferredPayloadType;\n    }\n    return codec.payloadType;\n  }).join(' ') + '\\r\\n';\n\n  sdp += 'c=IN IP4 0.0.0.0\\r\\n';\n  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\\r\\n';\n\n  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.\n  caps.codecs.forEach(function(codec) {\n    sdp += SDPUtils.writeRtpMap(codec);\n    sdp += SDPUtils.writeFmtp(codec);\n    sdp += SDPUtils.writeRtcpFb(codec);\n  });\n  var maxptime = 0;\n  caps.codecs.forEach(function(codec) {\n    if (codec.maxptime > maxptime) {\n      maxptime = codec.maxptime;\n    }\n  });\n  if (maxptime > 0) {\n    sdp += 'a=maxptime:' + maxptime + '\\r\\n';\n  }\n  sdp += 'a=rtcp-mux\\r\\n';\n\n  if (caps.headerExtensions) {\n    caps.headerExtensions.forEach(function(extension) {\n      sdp += SDPUtils.writeExtmap(extension);\n    });\n  }\n  // FIXME: write fecMechanisms.\n  return sdp;\n};\n\n// Parses the SDP media section and returns an array of\n// RTCRtpEncodingParameters.\nSDPUtils.parseRtpEncodingParameters = function(mediaSection) {\n  var encodingParameters = [];\n  var description = SDPUtils.parseRtpParameters(mediaSection);\n  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;\n  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;\n\n  // filter a=ssrc:... cname:, ignore PlanB-msid\n  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(parts) {\n      return parts.attribute === 'cname';\n    });\n  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;\n  var secondarySsrc;\n\n  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')\n    .map(function(line) {\n      var parts = line.substr(17).split(' ');\n      return parts.map(function(part) {\n        return parseInt(part, 10);\n      });\n    });\n  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {\n    secondarySsrc = flows[0][1];\n  }\n\n  description.codecs.forEach(function(codec) {\n    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {\n      var encParam = {\n        ssrc: primarySsrc,\n        codecPayloadType: parseInt(codec.parameters.apt, 10)\n      };\n      if (primarySsrc && secondarySsrc) {\n        encParam.rtx = {ssrc: secondarySsrc};\n      }\n      encodingParameters.push(encParam);\n      if (hasRed) {\n        encParam = JSON.parse(JSON.stringify(encParam));\n        encParam.fec = {\n          ssrc: primarySsrc,\n          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'\n        };\n        encodingParameters.push(encParam);\n      }\n    }\n  });\n  if (encodingParameters.length === 0 && primarySsrc) {\n    encodingParameters.push({\n      ssrc: primarySsrc\n    });\n  }\n\n  // we support both b=AS and b=TIAS but interpret AS as TIAS.\n  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');\n  if (bandwidth.length) {\n    if (bandwidth[0].indexOf('b=TIAS:') === 0) {\n      bandwidth = parseInt(bandwidth[0].substr(7), 10);\n    } else if (bandwidth[0].indexOf('b=AS:') === 0) {\n      // use formula from JSEP to convert b=AS to TIAS value.\n      bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95\n          - (50 * 40 * 8);\n    } else {\n      bandwidth = undefined;\n    }\n    encodingParameters.forEach(function(params) {\n      params.maxBitrate = bandwidth;\n    });\n  }\n  return encodingParameters;\n};\n\n// parses http://draft.ortc.org/#rtcrtcpparameters*\nSDPUtils.parseRtcpParameters = function(mediaSection) {\n  var rtcpParameters = {};\n\n  // Gets the first SSRC. Note tha with RTX there might be multiple\n  // SSRCs.\n  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(obj) {\n      return obj.attribute === 'cname';\n    })[0];\n  if (remoteSsrc) {\n    rtcpParameters.cname = remoteSsrc.value;\n    rtcpParameters.ssrc = remoteSsrc.ssrc;\n  }\n\n  // Edge uses the compound attribute instead of reducedSize\n  // compound is !reducedSize\n  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');\n  rtcpParameters.reducedSize = rsize.length > 0;\n  rtcpParameters.compound = rsize.length === 0;\n\n  // parses the rtcp-mux attrіbute.\n  // Note that Edge does not support unmuxed RTCP.\n  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');\n  rtcpParameters.mux = mux.length > 0;\n\n  return rtcpParameters;\n};\n\n// parses either a=msid: or a=ssrc:... msid lines and returns\n// the id of the MediaStream and MediaStreamTrack.\nSDPUtils.parseMsid = function(mediaSection) {\n  var parts;\n  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');\n  if (spec.length === 1) {\n    parts = spec[0].substr(7).split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(msidParts) {\n      return msidParts.attribute === 'msid';\n    });\n  if (planB.length > 0) {\n    parts = planB[0].value.split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n};\n\n// SCTP\n// parses draft-ietf-mmusic-sctp-sdp-26 first and falls back\n// to draft-ietf-mmusic-sctp-sdp-05\nSDPUtils.parseSctpDescription = function(mediaSection) {\n  var mline = SDPUtils.parseMLine(mediaSection);\n  var maxSizeLine = SDPUtils.matchPrefix(mediaSection, 'a=max-message-size:');\n  var maxMessageSize;\n  if (maxSizeLine.length > 0) {\n    maxMessageSize = parseInt(maxSizeLine[0].substr(19), 10);\n  }\n  if (isNaN(maxMessageSize)) {\n    maxMessageSize = 65536;\n  }\n  var sctpPort = SDPUtils.matchPrefix(mediaSection, 'a=sctp-port:');\n  if (sctpPort.length > 0) {\n    return {\n      port: parseInt(sctpPort[0].substr(12), 10),\n      protocol: mline.fmt,\n      maxMessageSize: maxMessageSize\n    };\n  }\n  var sctpMapLines = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:');\n  if (sctpMapLines.length > 0) {\n    var parts = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:')[0]\n      .substr(10)\n      .split(' ');\n    return {\n      port: parseInt(parts[0], 10),\n      protocol: parts[1],\n      maxMessageSize: maxMessageSize\n    };\n  }\n};\n\n// SCTP\n// outputs the draft-ietf-mmusic-sctp-sdp-26 version that all browsers\n// support by now receiving in this format, unless we originally parsed\n// as the draft-ietf-mmusic-sctp-sdp-05 format (indicated by the m-line\n// protocol of DTLS/SCTP -- without UDP/ or TCP/)\nSDPUtils.writeSctpDescription = function(media, sctp) {\n  var output = [];\n  if (media.protocol !== 'DTLS/SCTP') {\n    output = [\n      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.protocol + '\\r\\n',\n      'c=IN IP4 0.0.0.0\\r\\n',\n      'a=sctp-port:' + sctp.port + '\\r\\n'\n    ];\n  } else {\n    output = [\n      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.port + '\\r\\n',\n      'c=IN IP4 0.0.0.0\\r\\n',\n      'a=sctpmap:' + sctp.port + ' ' + sctp.protocol + ' 65535\\r\\n'\n    ];\n  }\n  if (sctp.maxMessageSize !== undefined) {\n    output.push('a=max-message-size:' + sctp.maxMessageSize + '\\r\\n');\n  }\n  return output.join('');\n};\n\n// Generate a session ID for SDP.\n// https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1\n// recommends using a cryptographically random +ve 64-bit value\n// but right now this should be acceptable and within the right range\nSDPUtils.generateSessionId = function() {\n  return Math.random().toString().substr(2, 21);\n};\n\n// Write boilder plate for start of SDP\n// sessId argument is optional - if not supplied it will\n// be generated randomly\n// sessVersion is optional and defaults to 2\n// sessUser is optional and defaults to 'thisisadapterortc'\nSDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {\n  var sessionId;\n  var version = sessVer !== undefined ? sessVer : 2;\n  if (sessId) {\n    sessionId = sessId;\n  } else {\n    sessionId = SDPUtils.generateSessionId();\n  }\n  var user = sessUser || 'thisisadapterortc';\n  // FIXME: sess-id should be an NTP timestamp.\n  return 'v=0\\r\\n' +\n      'o=' + user + ' ' + sessionId + ' ' + version +\n        ' IN IP4 127.0.0.1\\r\\n' +\n      's=-\\r\\n' +\n      't=0 0\\r\\n';\n};\n\nSDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n    transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n    transceiver.dtlsTransport.getLocalParameters(),\n    type === 'offer' ? 'actpass' : 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.direction) {\n    sdp += 'a=' + transceiver.direction + '\\r\\n';\n  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    // spec.\n    var msid = 'msid:' + stream.id + ' ' +\n        transceiver.rtpSender.track.id + '\\r\\n';\n    sdp += 'a=' + msid;\n\n    // for Chrome.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n};\n\n// Gets the direction from the mediaSection or the sessionpart.\nSDPUtils.getDirection = function(mediaSection, sessionpart) {\n  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.\n  var lines = SDPUtils.splitLines(mediaSection);\n  for (var i = 0; i < lines.length; i++) {\n    switch (lines[i]) {\n      case 'a=sendrecv':\n      case 'a=sendonly':\n      case 'a=recvonly':\n      case 'a=inactive':\n        return lines[i].substr(2);\n      default:\n        // FIXME: What should happen here?\n    }\n  }\n  if (sessionpart) {\n    return SDPUtils.getDirection(sessionpart);\n  }\n  return 'sendrecv';\n};\n\nSDPUtils.getKind = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  return mline[0].substr(2);\n};\n\nSDPUtils.isRejected = function(mediaSection) {\n  return mediaSection.split(' ', 2)[1] === '0';\n};\n\nSDPUtils.parseMLine = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var parts = lines[0].substr(2).split(' ');\n  return {\n    kind: parts[0],\n    port: parseInt(parts[1], 10),\n    protocol: parts[2],\n    fmt: parts.slice(3).join(' ')\n  };\n};\n\nSDPUtils.parseOLine = function(mediaSection) {\n  var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];\n  var parts = line.substr(2).split(' ');\n  return {\n    username: parts[0],\n    sessionId: parts[1],\n    sessionVersion: parseInt(parts[2], 10),\n    netType: parts[3],\n    addressType: parts[4],\n    address: parts[5]\n  };\n};\n\n// a very naive interpretation of a valid SDP.\nSDPUtils.isValidSDP = function(blob) {\n  if (typeof blob !== 'string' || blob.length === 0) {\n    return false;\n  }\n  var lines = SDPUtils.splitLines(blob);\n  for (var i = 0; i < lines.length; i++) {\n    if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {\n      return false;\n    }\n    // TODO: check the modifier a bit more.\n  }\n  return true;\n};\n\n// Expose public methods.\nif (typeof module === 'object') {\n  module.exports = SDPUtils;\n}\n","/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nvar SDPUtils = require('sdp');\n\nfunction fixStatsType(stat) {\n  return {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  }[stat.type] || stat.type;\n}\n\nfunction writeMediaSection(transceiver, caps, type, stream, dtlsRole) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n      transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n      transceiver.dtlsTransport.getLocalParameters(),\n      type === 'offer' ? 'actpass' : dtlsRole || 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    var trackId = transceiver.rtpSender._initialTrackId ||\n        transceiver.rtpSender.track.id;\n    transceiver.rtpSender._initialTrackId = trackId;\n    // spec.\n    var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +\n        trackId + '\\r\\n';\n    sdp += 'a=' + msid;\n    // for Chrome. Legacy should no longer be required.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n\n    // RTX\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n}\n\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nfunction filterIceServers(iceServers, edgeVersion) {\n  var hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(function(server) {\n    if (server && (server.urls || server.url)) {\n      var urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        console.warn('RTCIceServer.url is deprecated! Use urls instead.');\n      }\n      var isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(function(url) {\n        var validTurn = url.indexOf('turn:') === 0 &&\n            url.indexOf('transport=udp') !== -1 &&\n            url.indexOf('turn:[') === -1 &&\n            !hasTurn;\n\n        if (validTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&\n            url.indexOf('?transport=udp') === -1;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n\n// Determines the intersection of local and remote capabilities.\nfunction getCommonCapabilities(localCapabilities, remoteCapabilities) {\n  var commonCapabilities = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: []\n  };\n\n  var findCodecByPayloadType = function(pt, codecs) {\n    pt = parseInt(pt, 10);\n    for (var i = 0; i < codecs.length; i++) {\n      if (codecs[i].payloadType === pt ||\n          codecs[i].preferredPayloadType === pt) {\n        return codecs[i];\n      }\n    }\n  };\n\n  var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {\n    var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);\n    var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);\n    return lCodec && rCodec &&\n        lCodec.name.toLowerCase() === rCodec.name.toLowerCase();\n  };\n\n  localCapabilities.codecs.forEach(function(lCodec) {\n    for (var i = 0; i < remoteCapabilities.codecs.length; i++) {\n      var rCodec = remoteCapabilities.codecs[i];\n      if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&\n          lCodec.clockRate === rCodec.clockRate) {\n        if (lCodec.name.toLowerCase() === 'rtx' &&\n            lCodec.parameters && rCodec.parameters.apt) {\n          // for RTX we need to find the local rtx that has a apt\n          // which points to the same local codec as the remote one.\n          if (!rtxCapabilityMatches(lCodec, rCodec,\n              localCapabilities.codecs, remoteCapabilities.codecs)) {\n            continue;\n          }\n        }\n        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy\n        // number of channels is the highest common number of channels\n        rCodec.numChannels = Math.min(lCodec.numChannels,\n            rCodec.numChannels);\n        // push rCodec so we reply with offerer payload type\n        commonCapabilities.codecs.push(rCodec);\n\n        // determine common feedback mechanisms\n        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {\n          for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {\n            if (lCodec.rtcpFeedback[j].type === fb.type &&\n                lCodec.rtcpFeedback[j].parameter === fb.parameter) {\n              return true;\n            }\n          }\n          return false;\n        });\n        // FIXME: also need to determine .parameters\n        //  see https://github.com/openpeer/ortc/issues/569\n        break;\n      }\n    }\n  });\n\n  localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {\n    for (var i = 0; i < remoteCapabilities.headerExtensions.length;\n         i++) {\n      var rHeaderExtension = remoteCapabilities.headerExtensions[i];\n      if (lHeaderExtension.uri === rHeaderExtension.uri) {\n        commonCapabilities.headerExtensions.push(rHeaderExtension);\n        break;\n      }\n    }\n  });\n\n  // FIXME: fecMechanisms\n  return commonCapabilities;\n}\n\n// is action=setLocalDescription with type allowed in signalingState\nfunction isActionAllowedInSignalingState(action, type, signalingState) {\n  return {\n    offer: {\n      setLocalDescription: ['stable', 'have-local-offer'],\n      setRemoteDescription: ['stable', 'have-remote-offer']\n    },\n    answer: {\n      setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],\n      setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']\n    }\n  }[type][action].indexOf(signalingState) !== -1;\n}\n\nfunction maybeAddCandidate(iceTransport, candidate) {\n  // Edge's internal representation adds some fields therefore\n  // not all fieldѕ are taken into account.\n  var alreadyAdded = iceTransport.getRemoteCandidates()\n      .find(function(remoteCandidate) {\n        return candidate.foundation === remoteCandidate.foundation &&\n            candidate.ip === remoteCandidate.ip &&\n            candidate.port === remoteCandidate.port &&\n            candidate.priority === remoteCandidate.priority &&\n            candidate.protocol === remoteCandidate.protocol &&\n            candidate.type === remoteCandidate.type;\n      });\n  if (!alreadyAdded) {\n    iceTransport.addRemoteCandidate(candidate);\n  }\n  return !alreadyAdded;\n}\n\n\nfunction makeError(name, description) {\n  var e = new Error(description);\n  e.name = name;\n  // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names\n  e.code = {\n    NotSupportedError: 9,\n    InvalidStateError: 11,\n    InvalidAccessError: 15,\n    TypeError: undefined,\n    OperationError: undefined\n  }[name];\n  return e;\n}\n\nmodule.exports = function(window, edgeVersion) {\n  // https://w3c.github.io/mediacapture-main/#mediastream\n  // Helper function to add the track to the stream and\n  // dispatch the event ourselves.\n  function addTrackToStreamAndFireEvent(track, stream) {\n    stream.addTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack',\n        {track: track}));\n  }\n\n  function removeTrackFromStreamAndFireEvent(track, stream) {\n    stream.removeTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack',\n        {track: track}));\n  }\n\n  function fireAddTrack(pc, track, receiver, streams) {\n    var trackEvent = new Event('track');\n    trackEvent.track = track;\n    trackEvent.receiver = receiver;\n    trackEvent.transceiver = {receiver: receiver};\n    trackEvent.streams = streams;\n    window.setTimeout(function() {\n      pc._dispatchEvent('track', trackEvent);\n    });\n  }\n\n  var RTCPeerConnection = function(config) {\n    var pc = this;\n\n    var _eventTarget = document.createDocumentFragment();\n    ['addEventListener', 'removeEventListener', 'dispatchEvent']\n        .forEach(function(method) {\n          pc[method] = _eventTarget[method].bind(_eventTarget);\n        });\n\n    this.canTrickleIceCandidates = null;\n\n    this.needNegotiation = false;\n\n    this.localStreams = [];\n    this.remoteStreams = [];\n\n    this._localDescription = null;\n    this._remoteDescription = null;\n\n    this.signalingState = 'stable';\n    this.iceConnectionState = 'new';\n    this.connectionState = 'new';\n    this.iceGatheringState = 'new';\n\n    config = JSON.parse(JSON.stringify(config || {}));\n\n    this.usingBundle = config.bundlePolicy === 'max-bundle';\n    if (config.rtcpMuxPolicy === 'negotiate') {\n      throw(makeError('NotSupportedError',\n          'rtcpMuxPolicy \\'negotiate\\' is not supported'));\n    } else if (!config.rtcpMuxPolicy) {\n      config.rtcpMuxPolicy = 'require';\n    }\n\n    switch (config.iceTransportPolicy) {\n      case 'all':\n      case 'relay':\n        break;\n      default:\n        config.iceTransportPolicy = 'all';\n        break;\n    }\n\n    switch (config.bundlePolicy) {\n      case 'balanced':\n      case 'max-compat':\n      case 'max-bundle':\n        break;\n      default:\n        config.bundlePolicy = 'balanced';\n        break;\n    }\n\n    config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);\n\n    this._iceGatherers = [];\n    if (config.iceCandidatePoolSize) {\n      for (var i = config.iceCandidatePoolSize; i > 0; i--) {\n        this._iceGatherers.push(new window.RTCIceGatherer({\n          iceServers: config.iceServers,\n          gatherPolicy: config.iceTransportPolicy\n        }));\n      }\n    } else {\n      config.iceCandidatePoolSize = 0;\n    }\n\n    this._config = config;\n\n    // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...\n    // everything that is needed to describe a SDP m-line.\n    this.transceivers = [];\n\n    this._sdpSessionId = SDPUtils.generateSessionId();\n    this._sdpSessionVersion = 0;\n\n    this._dtlsRole = undefined; // role for a=setup to use in answers.\n\n    this._isClosed = false;\n  };\n\n  Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {\n    configurable: true,\n    get: function() {\n      return this._localDescription;\n    }\n  });\n  Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {\n    configurable: true,\n    get: function() {\n      return this._remoteDescription;\n    }\n  });\n\n  // set up event handlers on prototype\n  RTCPeerConnection.prototype.onicecandidate = null;\n  RTCPeerConnection.prototype.onaddstream = null;\n  RTCPeerConnection.prototype.ontrack = null;\n  RTCPeerConnection.prototype.onremovestream = null;\n  RTCPeerConnection.prototype.onsignalingstatechange = null;\n  RTCPeerConnection.prototype.oniceconnectionstatechange = null;\n  RTCPeerConnection.prototype.onconnectionstatechange = null;\n  RTCPeerConnection.prototype.onicegatheringstatechange = null;\n  RTCPeerConnection.prototype.onnegotiationneeded = null;\n  RTCPeerConnection.prototype.ondatachannel = null;\n\n  RTCPeerConnection.prototype._dispatchEvent = function(name, event) {\n    if (this._isClosed) {\n      return;\n    }\n    this.dispatchEvent(event);\n    if (typeof this['on' + name] === 'function') {\n      this['on' + name](event);\n    }\n  };\n\n  RTCPeerConnection.prototype._emitGatheringStateChange = function() {\n    var event = new Event('icegatheringstatechange');\n    this._dispatchEvent('icegatheringstatechange', event);\n  };\n\n  RTCPeerConnection.prototype.getConfiguration = function() {\n    return this._config;\n  };\n\n  RTCPeerConnection.prototype.getLocalStreams = function() {\n    return this.localStreams;\n  };\n\n  RTCPeerConnection.prototype.getRemoteStreams = function() {\n    return this.remoteStreams;\n  };\n\n  // internal helper to create a transceiver object.\n  // (which is not yet the same as the WebRTC 1.0 transceiver)\n  RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {\n    var hasBundleTransport = this.transceivers.length > 0;\n    var transceiver = {\n      track: null,\n      iceGatherer: null,\n      iceTransport: null,\n      dtlsTransport: null,\n      localCapabilities: null,\n      remoteCapabilities: null,\n      rtpSender: null,\n      rtpReceiver: null,\n      kind: kind,\n      mid: null,\n      sendEncodingParameters: null,\n      recvEncodingParameters: null,\n      stream: null,\n      associatedRemoteMediaStreams: [],\n      wantReceive: true\n    };\n    if (this.usingBundle && hasBundleTransport) {\n      transceiver.iceTransport = this.transceivers[0].iceTransport;\n      transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;\n    } else {\n      var transports = this._createIceAndDtlsTransports();\n      transceiver.iceTransport = transports.iceTransport;\n      transceiver.dtlsTransport = transports.dtlsTransport;\n    }\n    if (!doNotAdd) {\n      this.transceivers.push(transceiver);\n    }\n    return transceiver;\n  };\n\n  RTCPeerConnection.prototype.addTrack = function(track, stream) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call addTrack on a closed peerconnection.');\n    }\n\n    var alreadyExists = this.transceivers.find(function(s) {\n      return s.track === track;\n    });\n\n    if (alreadyExists) {\n      throw makeError('InvalidAccessError', 'Track already exists.');\n    }\n\n    var transceiver;\n    for (var i = 0; i < this.transceivers.length; i++) {\n      if (!this.transceivers[i].track &&\n          this.transceivers[i].kind === track.kind) {\n        transceiver = this.transceivers[i];\n      }\n    }\n    if (!transceiver) {\n      transceiver = this._createTransceiver(track.kind);\n    }\n\n    this._maybeFireNegotiationNeeded();\n\n    if (this.localStreams.indexOf(stream) === -1) {\n      this.localStreams.push(stream);\n    }\n\n    transceiver.track = track;\n    transceiver.stream = stream;\n    transceiver.rtpSender = new window.RTCRtpSender(track,\n        transceiver.dtlsTransport);\n    return transceiver.rtpSender;\n  };\n\n  RTCPeerConnection.prototype.addStream = function(stream) {\n    var pc = this;\n    if (edgeVersion >= 15025) {\n      stream.getTracks().forEach(function(track) {\n        pc.addTrack(track, stream);\n      });\n    } else {\n      // Clone is necessary for local demos mostly, attaching directly\n      // to two different senders does not work (build 10547).\n      // Fixed in 15025 (or earlier)\n      var clonedStream = stream.clone();\n      stream.getTracks().forEach(function(track, idx) {\n        var clonedTrack = clonedStream.getTracks()[idx];\n        track.addEventListener('enabled', function(event) {\n          clonedTrack.enabled = event.enabled;\n        });\n      });\n      clonedStream.getTracks().forEach(function(track) {\n        pc.addTrack(track, clonedStream);\n      });\n    }\n  };\n\n  RTCPeerConnection.prototype.removeTrack = function(sender) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call removeTrack on a closed peerconnection.');\n    }\n\n    if (!(sender instanceof window.RTCRtpSender)) {\n      throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' +\n          'does not implement interface RTCRtpSender.');\n    }\n\n    var transceiver = this.transceivers.find(function(t) {\n      return t.rtpSender === sender;\n    });\n\n    if (!transceiver) {\n      throw makeError('InvalidAccessError',\n          'Sender was not created by this connection.');\n    }\n    var stream = transceiver.stream;\n\n    transceiver.rtpSender.stop();\n    transceiver.rtpSender = null;\n    transceiver.track = null;\n    transceiver.stream = null;\n\n    // remove the stream from the set of local streams\n    var localStreams = this.transceivers.map(function(t) {\n      return t.stream;\n    });\n    if (localStreams.indexOf(stream) === -1 &&\n        this.localStreams.indexOf(stream) > -1) {\n      this.localStreams.splice(this.localStreams.indexOf(stream), 1);\n    }\n\n    this._maybeFireNegotiationNeeded();\n  };\n\n  RTCPeerConnection.prototype.removeStream = function(stream) {\n    var pc = this;\n    stream.getTracks().forEach(function(track) {\n      var sender = pc.getSenders().find(function(s) {\n        return s.track === track;\n      });\n      if (sender) {\n        pc.removeTrack(sender);\n      }\n    });\n  };\n\n  RTCPeerConnection.prototype.getSenders = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpSender;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpSender;\n    });\n  };\n\n  RTCPeerConnection.prototype.getReceivers = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpReceiver;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpReceiver;\n    });\n  };\n\n\n  RTCPeerConnection.prototype._createIceGatherer = function(sdpMLineIndex,\n      usingBundle) {\n    var pc = this;\n    if (usingBundle && sdpMLineIndex > 0) {\n      return this.transceivers[0].iceGatherer;\n    } else if (this._iceGatherers.length) {\n      return this._iceGatherers.shift();\n    }\n    var iceGatherer = new window.RTCIceGatherer({\n      iceServers: this._config.iceServers,\n      gatherPolicy: this._config.iceTransportPolicy\n    });\n    Object.defineProperty(iceGatherer, 'state',\n        {value: 'new', writable: true}\n    );\n\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];\n    this.transceivers[sdpMLineIndex].bufferCandidates = function(event) {\n      var end = !event.candidate || Object.keys(event.candidate).length === 0;\n      // polyfill since RTCIceGatherer.state is not implemented in\n      // Edge 10547 yet.\n      iceGatherer.state = end ? 'completed' : 'gathering';\n      if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {\n        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);\n      }\n    };\n    iceGatherer.addEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    return iceGatherer;\n  };\n\n  // start gathering from an RTCIceGatherer.\n  RTCPeerConnection.prototype._gather = function(mid, sdpMLineIndex) {\n    var pc = this;\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer.onlocalcandidate) {\n      return;\n    }\n    var bufferedCandidateEvents =\n      this.transceivers[sdpMLineIndex].bufferedCandidateEvents;\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;\n    iceGatherer.removeEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    iceGatherer.onlocalcandidate = function(evt) {\n      if (pc.usingBundle && sdpMLineIndex > 0) {\n        // if we know that we use bundle we can drop candidates with\n        // ѕdpMLineIndex > 0. If we don't do this then our state gets\n        // confused since we dispose the extra ice gatherer.\n        return;\n      }\n      var event = new Event('icecandidate');\n      event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};\n\n      var cand = evt.candidate;\n      // Edge emits an empty object for RTCIceCandidateComplete‥\n      var end = !cand || Object.keys(cand).length === 0;\n      if (end) {\n        // polyfill since RTCIceGatherer.state is not implemented in\n        // Edge 10547 yet.\n        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {\n          iceGatherer.state = 'completed';\n        }\n      } else {\n        if (iceGatherer.state === 'new') {\n          iceGatherer.state = 'gathering';\n        }\n        // RTCIceCandidate doesn't have a component, needs to be added\n        cand.component = 1;\n        // also the usernameFragment. TODO: update SDP to take both variants.\n        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;\n\n        var serializedCandidate = SDPUtils.writeCandidate(cand);\n        event.candidate = Object.assign(event.candidate,\n            SDPUtils.parseCandidate(serializedCandidate));\n\n        event.candidate.candidate = serializedCandidate;\n        event.candidate.toJSON = function() {\n          return {\n            candidate: event.candidate.candidate,\n            sdpMid: event.candidate.sdpMid,\n            sdpMLineIndex: event.candidate.sdpMLineIndex,\n            usernameFragment: event.candidate.usernameFragment\n          };\n        };\n      }\n\n      // update local description.\n      var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);\n      if (!end) {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=' + event.candidate.candidate + '\\r\\n';\n      } else {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=end-of-candidates\\r\\n';\n      }\n      pc._localDescription.sdp =\n          SDPUtils.getDescription(pc._localDescription.sdp) +\n          sections.join('');\n      var complete = pc.transceivers.every(function(transceiver) {\n        return transceiver.iceGatherer &&\n            transceiver.iceGatherer.state === 'completed';\n      });\n\n      if (pc.iceGatheringState !== 'gathering') {\n        pc.iceGatheringState = 'gathering';\n        pc._emitGatheringStateChange();\n      }\n\n      // Emit candidate. Also emit null candidate when all gatherers are\n      // complete.\n      if (!end) {\n        pc._dispatchEvent('icecandidate', event);\n      }\n      if (complete) {\n        pc._dispatchEvent('icecandidate', new Event('icecandidate'));\n        pc.iceGatheringState = 'complete';\n        pc._emitGatheringStateChange();\n      }\n    };\n\n    // emit already gathered candidates.\n    window.setTimeout(function() {\n      bufferedCandidateEvents.forEach(function(e) {\n        iceGatherer.onlocalcandidate(e);\n      });\n    }, 0);\n  };\n\n  // Create ICE transport and DTLS transport.\n  RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {\n    var pc = this;\n    var iceTransport = new window.RTCIceTransport(null);\n    iceTransport.onicestatechange = function() {\n      pc._updateIceConnectionState();\n      pc._updateConnectionState();\n    };\n\n    var dtlsTransport = new window.RTCDtlsTransport(iceTransport);\n    dtlsTransport.ondtlsstatechange = function() {\n      pc._updateConnectionState();\n    };\n    dtlsTransport.onerror = function() {\n      // onerror does not set state to failed by itself.\n      Object.defineProperty(dtlsTransport, 'state',\n          {value: 'failed', writable: true});\n      pc._updateConnectionState();\n    };\n\n    return {\n      iceTransport: iceTransport,\n      dtlsTransport: dtlsTransport\n    };\n  };\n\n  // Destroy ICE gatherer, ICE transport and DTLS transport.\n  // Without triggering the callbacks.\n  RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(\n      sdpMLineIndex) {\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer) {\n      delete iceGatherer.onlocalcandidate;\n      delete this.transceivers[sdpMLineIndex].iceGatherer;\n    }\n    var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;\n    if (iceTransport) {\n      delete iceTransport.onicestatechange;\n      delete this.transceivers[sdpMLineIndex].iceTransport;\n    }\n    var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;\n    if (dtlsTransport) {\n      delete dtlsTransport.ondtlsstatechange;\n      delete dtlsTransport.onerror;\n      delete this.transceivers[sdpMLineIndex].dtlsTransport;\n    }\n  };\n\n  // Start the RTP Sender and Receiver for a transceiver.\n  RTCPeerConnection.prototype._transceive = function(transceiver,\n      send, recv) {\n    var params = getCommonCapabilities(transceiver.localCapabilities,\n        transceiver.remoteCapabilities);\n    if (send && transceiver.rtpSender) {\n      params.encodings = transceiver.sendEncodingParameters;\n      params.rtcp = {\n        cname: SDPUtils.localCName,\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.recvEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpSender.send(params);\n    }\n    if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {\n      // remove RTX field in Edge 14942\n      if (transceiver.kind === 'video'\n          && transceiver.recvEncodingParameters\n          && edgeVersion < 15019) {\n        transceiver.recvEncodingParameters.forEach(function(p) {\n          delete p.rtx;\n        });\n      }\n      if (transceiver.recvEncodingParameters.length) {\n        params.encodings = transceiver.recvEncodingParameters;\n      } else {\n        params.encodings = [{}];\n      }\n      params.rtcp = {\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.rtcpParameters.cname) {\n        params.rtcp.cname = transceiver.rtcpParameters.cname;\n      }\n      if (transceiver.sendEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpReceiver.receive(params);\n    }\n  };\n\n  RTCPeerConnection.prototype.setLocalDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setLocalDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set local ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var sections;\n    var sessionpart;\n    if (description.type === 'offer') {\n      // VERY limited support for SDP munging. Limited to:\n      // * changing the order of codecs\n      sections = SDPUtils.splitSections(description.sdp);\n      sessionpart = sections.shift();\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var caps = SDPUtils.parseRtpParameters(mediaSection);\n        pc.transceivers[sdpMLineIndex].localCapabilities = caps;\n      });\n\n      pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n        pc._gather(transceiver.mid, sdpMLineIndex);\n      });\n    } else if (description.type === 'answer') {\n      sections = SDPUtils.splitSections(pc._remoteDescription.sdp);\n      sessionpart = sections.shift();\n      var isIceLite = SDPUtils.matchPrefix(sessionpart,\n          'a=ice-lite').length > 0;\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        var iceGatherer = transceiver.iceGatherer;\n        var iceTransport = transceiver.iceTransport;\n        var dtlsTransport = transceiver.dtlsTransport;\n        var localCapabilities = transceiver.localCapabilities;\n        var remoteCapabilities = transceiver.remoteCapabilities;\n\n        // treat bundle-only as not-rejected.\n        var rejected = SDPUtils.isRejected(mediaSection) &&\n            SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n\n        if (!rejected && !transceiver.rejected) {\n          var remoteIceParameters = SDPUtils.getIceParameters(\n              mediaSection, sessionpart);\n          var remoteDtlsParameters = SDPUtils.getDtlsParameters(\n              mediaSection, sessionpart);\n          if (isIceLite) {\n            remoteDtlsParameters.role = 'server';\n          }\n\n          if (!pc.usingBundle || sdpMLineIndex === 0) {\n            pc._gather(transceiver.mid, sdpMLineIndex);\n            if (iceTransport.state === 'new') {\n              iceTransport.start(iceGatherer, remoteIceParameters,\n                  isIceLite ? 'controlling' : 'controlled');\n            }\n            if (dtlsTransport.state === 'new') {\n              dtlsTransport.start(remoteDtlsParameters);\n            }\n          }\n\n          // Calculate intersection of capabilities.\n          var params = getCommonCapabilities(localCapabilities,\n              remoteCapabilities);\n\n          // Start the RTCRtpSender. The RTCRtpReceiver for this\n          // transceiver has already been started in setRemoteDescription.\n          pc._transceive(transceiver,\n              params.codecs.length > 0,\n              false);\n        }\n      });\n    }\n\n    pc._localDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-local-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.setRemoteDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setRemoteDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set remote ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var streams = {};\n    pc.remoteStreams.forEach(function(stream) {\n      streams[stream.id] = stream;\n    });\n    var receiverList = [];\n    var sections = SDPUtils.splitSections(description.sdp);\n    var sessionpart = sections.shift();\n    var isIceLite = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-lite').length > 0;\n    var usingBundle = SDPUtils.matchPrefix(sessionpart,\n        'a=group:BUNDLE ').length > 0;\n    pc.usingBundle = usingBundle;\n    var iceOptions = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-options:')[0];\n    if (iceOptions) {\n      pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ')\n          .indexOf('trickle') >= 0;\n    } else {\n      pc.canTrickleIceCandidates = false;\n    }\n\n    sections.forEach(function(mediaSection, sdpMLineIndex) {\n      var lines = SDPUtils.splitLines(mediaSection);\n      var kind = SDPUtils.getKind(mediaSection);\n      // treat bundle-only as not-rejected.\n      var rejected = SDPUtils.isRejected(mediaSection) &&\n          SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n      var protocol = lines[0].substr(2).split(' ')[2];\n\n      var direction = SDPUtils.getDirection(mediaSection, sessionpart);\n      var remoteMsid = SDPUtils.parseMsid(mediaSection);\n\n      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();\n\n      // Reject datachannels which are not implemented yet.\n      if (rejected || (kind === 'application' && (protocol === 'DTLS/SCTP' ||\n          protocol === 'UDP/DTLS/SCTP'))) {\n        // TODO: this is dangerous in the case where a non-rejected m-line\n        //     becomes rejected.\n        pc.transceivers[sdpMLineIndex] = {\n          mid: mid,\n          kind: kind,\n          protocol: protocol,\n          rejected: true\n        };\n        return;\n      }\n\n      if (!rejected && pc.transceivers[sdpMLineIndex] &&\n          pc.transceivers[sdpMLineIndex].rejected) {\n        // recycle a rejected transceiver.\n        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);\n      }\n\n      var transceiver;\n      var iceGatherer;\n      var iceTransport;\n      var dtlsTransport;\n      var rtpReceiver;\n      var sendEncodingParameters;\n      var recvEncodingParameters;\n      var localCapabilities;\n\n      var track;\n      // FIXME: ensure the mediaSection has rtcp-mux set.\n      var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);\n      var remoteIceParameters;\n      var remoteDtlsParameters;\n      if (!rejected) {\n        remoteIceParameters = SDPUtils.getIceParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters.role = 'client';\n      }\n      recvEncodingParameters =\n          SDPUtils.parseRtpEncodingParameters(mediaSection);\n\n      var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);\n\n      var isComplete = SDPUtils.matchPrefix(mediaSection,\n          'a=end-of-candidates', sessionpart).length > 0;\n      var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')\n          .map(function(cand) {\n            return SDPUtils.parseCandidate(cand);\n          })\n          .filter(function(cand) {\n            return cand.component === 1;\n          });\n\n      // Check if we can use BUNDLE and dispose transports.\n      if ((description.type === 'offer' || description.type === 'answer') &&\n          !rejected && usingBundle && sdpMLineIndex > 0 &&\n          pc.transceivers[sdpMLineIndex]) {\n        pc._disposeIceAndDtlsTransports(sdpMLineIndex);\n        pc.transceivers[sdpMLineIndex].iceGatherer =\n            pc.transceivers[0].iceGatherer;\n        pc.transceivers[sdpMLineIndex].iceTransport =\n            pc.transceivers[0].iceTransport;\n        pc.transceivers[sdpMLineIndex].dtlsTransport =\n            pc.transceivers[0].dtlsTransport;\n        if (pc.transceivers[sdpMLineIndex].rtpSender) {\n          pc.transceivers[sdpMLineIndex].rtpSender.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {\n          pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n      }\n      if (description.type === 'offer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex] ||\n            pc._createTransceiver(kind);\n        transceiver.mid = mid;\n\n        if (!transceiver.iceGatherer) {\n          transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n              usingBundle);\n        }\n\n        if (cands.length && transceiver.iceTransport.state === 'new') {\n          if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {\n            transceiver.iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);\n\n        // filter RTX until additional stuff needed for RTX is implemented\n        // in adapter.js\n        if (edgeVersion < 15019) {\n          localCapabilities.codecs = localCapabilities.codecs.filter(\n              function(codec) {\n                return codec.name !== 'rtx';\n              });\n        }\n\n        sendEncodingParameters = transceiver.sendEncodingParameters || [{\n          ssrc: (2 * sdpMLineIndex + 2) * 1001\n        }];\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        var isNewTrack = false;\n        if (direction === 'sendrecv' || direction === 'sendonly') {\n          isNewTrack = !transceiver.rtpReceiver;\n          rtpReceiver = transceiver.rtpReceiver ||\n              new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);\n\n          if (isNewTrack) {\n            var stream;\n            track = rtpReceiver.track;\n            // FIXME: does not work with Plan B.\n            if (remoteMsid && remoteMsid.stream === '-') {\n              // no-op. a stream id of '-' means: no associated stream.\n            } else if (remoteMsid) {\n              if (!streams[remoteMsid.stream]) {\n                streams[remoteMsid.stream] = new window.MediaStream();\n                Object.defineProperty(streams[remoteMsid.stream], 'id', {\n                  get: function() {\n                    return remoteMsid.stream;\n                  }\n                });\n              }\n              Object.defineProperty(track, 'id', {\n                get: function() {\n                  return remoteMsid.track;\n                }\n              });\n              stream = streams[remoteMsid.stream];\n            } else {\n              if (!streams.default) {\n                streams.default = new window.MediaStream();\n              }\n              stream = streams.default;\n            }\n            if (stream) {\n              addTrackToStreamAndFireEvent(track, stream);\n              transceiver.associatedRemoteMediaStreams.push(stream);\n            }\n            receiverList.push([track, rtpReceiver, stream]);\n          }\n        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {\n          transceiver.associatedRemoteMediaStreams.forEach(function(s) {\n            var nativeTrack = s.getTracks().find(function(t) {\n              return t.id === transceiver.rtpReceiver.track.id;\n            });\n            if (nativeTrack) {\n              removeTrackFromStreamAndFireEvent(nativeTrack, s);\n            }\n          });\n          transceiver.associatedRemoteMediaStreams = [];\n        }\n\n        transceiver.localCapabilities = localCapabilities;\n        transceiver.remoteCapabilities = remoteCapabilities;\n        transceiver.rtpReceiver = rtpReceiver;\n        transceiver.rtcpParameters = rtcpParameters;\n        transceiver.sendEncodingParameters = sendEncodingParameters;\n        transceiver.recvEncodingParameters = recvEncodingParameters;\n\n        // Start the RTCRtpReceiver now. The RTPSender is started in\n        // setLocalDescription.\n        pc._transceive(pc.transceivers[sdpMLineIndex],\n            false,\n            isNewTrack);\n      } else if (description.type === 'answer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex];\n        iceGatherer = transceiver.iceGatherer;\n        iceTransport = transceiver.iceTransport;\n        dtlsTransport = transceiver.dtlsTransport;\n        rtpReceiver = transceiver.rtpReceiver;\n        sendEncodingParameters = transceiver.sendEncodingParameters;\n        localCapabilities = transceiver.localCapabilities;\n\n        pc.transceivers[sdpMLineIndex].recvEncodingParameters =\n            recvEncodingParameters;\n        pc.transceivers[sdpMLineIndex].remoteCapabilities =\n            remoteCapabilities;\n        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;\n\n        if (cands.length && iceTransport.state === 'new') {\n          if ((isIceLite || isComplete) &&\n              (!usingBundle || sdpMLineIndex === 0)) {\n            iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        if (!usingBundle || sdpMLineIndex === 0) {\n          if (iceTransport.state === 'new') {\n            iceTransport.start(iceGatherer, remoteIceParameters,\n                'controlling');\n          }\n          if (dtlsTransport.state === 'new') {\n            dtlsTransport.start(remoteDtlsParameters);\n          }\n        }\n\n        // If the offer contained RTX but the answer did not,\n        // remove RTX from sendEncodingParameters.\n        var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n        var hasRtx = commonCapabilities.codecs.filter(function(c) {\n          return c.name.toLowerCase() === 'rtx';\n        }).length;\n        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n          delete transceiver.sendEncodingParameters[0].rtx;\n        }\n\n        pc._transceive(transceiver,\n            direction === 'sendrecv' || direction === 'recvonly',\n            direction === 'sendrecv' || direction === 'sendonly');\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        if (rtpReceiver &&\n            (direction === 'sendrecv' || direction === 'sendonly')) {\n          track = rtpReceiver.track;\n          if (remoteMsid) {\n            if (!streams[remoteMsid.stream]) {\n              streams[remoteMsid.stream] = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);\n            receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);\n          } else {\n            if (!streams.default) {\n              streams.default = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams.default);\n            receiverList.push([track, rtpReceiver, streams.default]);\n          }\n        } else {\n          // FIXME: actually the receiver should be created later.\n          delete transceiver.rtpReceiver;\n        }\n      }\n    });\n\n    if (pc._dtlsRole === undefined) {\n      pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';\n    }\n\n    pc._remoteDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-remote-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n    Object.keys(streams).forEach(function(sid) {\n      var stream = streams[sid];\n      if (stream.getTracks().length) {\n        if (pc.remoteStreams.indexOf(stream) === -1) {\n          pc.remoteStreams.push(stream);\n          var event = new Event('addstream');\n          event.stream = stream;\n          window.setTimeout(function() {\n            pc._dispatchEvent('addstream', event);\n          });\n        }\n\n        receiverList.forEach(function(item) {\n          var track = item[0];\n          var receiver = item[1];\n          if (stream.id !== item[2].id) {\n            return;\n          }\n          fireAddTrack(pc, track, receiver, [stream]);\n        });\n      }\n    });\n    receiverList.forEach(function(item) {\n      if (item[2]) {\n        return;\n      }\n      fireAddTrack(pc, item[0], item[1], []);\n    });\n\n    // check whether addIceCandidate({}) was called within four seconds after\n    // setRemoteDescription.\n    window.setTimeout(function() {\n      if (!(pc && pc.transceivers)) {\n        return;\n      }\n      pc.transceivers.forEach(function(transceiver) {\n        if (transceiver.iceTransport &&\n            transceiver.iceTransport.state === 'new' &&\n            transceiver.iceTransport.getRemoteCandidates().length > 0) {\n          console.warn('Timeout for addRemoteCandidate. Consider sending ' +\n              'an end-of-candidates notification');\n          transceiver.iceTransport.addRemoteCandidate({});\n        }\n      });\n    }, 4000);\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.close = function() {\n    this.transceivers.forEach(function(transceiver) {\n      /* not yet\n      if (transceiver.iceGatherer) {\n        transceiver.iceGatherer.close();\n      }\n      */\n      if (transceiver.iceTransport) {\n        transceiver.iceTransport.stop();\n      }\n      if (transceiver.dtlsTransport) {\n        transceiver.dtlsTransport.stop();\n      }\n      if (transceiver.rtpSender) {\n        transceiver.rtpSender.stop();\n      }\n      if (transceiver.rtpReceiver) {\n        transceiver.rtpReceiver.stop();\n      }\n    });\n    // FIXME: clean up tracks, local streams, remote streams, etc\n    this._isClosed = true;\n    this._updateSignalingState('closed');\n  };\n\n  // Update the signaling state.\n  RTCPeerConnection.prototype._updateSignalingState = function(newState) {\n    this.signalingState = newState;\n    var event = new Event('signalingstatechange');\n    this._dispatchEvent('signalingstatechange', event);\n  };\n\n  // Determine whether to fire the negotiationneeded event.\n  RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {\n    var pc = this;\n    if (this.signalingState !== 'stable' || this.needNegotiation === true) {\n      return;\n    }\n    this.needNegotiation = true;\n    window.setTimeout(function() {\n      if (pc.needNegotiation) {\n        pc.needNegotiation = false;\n        var event = new Event('negotiationneeded');\n        pc._dispatchEvent('negotiationneeded', event);\n      }\n    }, 0);\n  };\n\n  // Update the ice connection state.\n  RTCPeerConnection.prototype._updateIceConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      checking: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n      }\n    });\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.checking > 0) {\n      newState = 'checking';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    } else if (states.completed > 0) {\n      newState = 'completed';\n    }\n\n    if (newState !== this.iceConnectionState) {\n      this.iceConnectionState = newState;\n      var event = new Event('iceconnectionstatechange');\n      this._dispatchEvent('iceconnectionstatechange', event);\n    }\n  };\n\n  // Update the connection state.\n  RTCPeerConnection.prototype._updateConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      connecting: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && transceiver.dtlsTransport &&\n          !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n        states[transceiver.dtlsTransport.state]++;\n      }\n    });\n    // ICETransport.completed and connected are the same for this purpose.\n    states.connected += states.completed;\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.connecting > 0) {\n      newState = 'connecting';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    }\n\n    if (newState !== this.connectionState) {\n      this.connectionState = newState;\n      var event = new Event('connectionstatechange');\n      this._dispatchEvent('connectionstatechange', event);\n    }\n  };\n\n  RTCPeerConnection.prototype.createOffer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createOffer after close'));\n    }\n\n    var numAudioTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'audio';\n    }).length;\n    var numVideoTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'video';\n    }).length;\n\n    // Determine number of audio and video tracks we need to send/recv.\n    var offerOptions = arguments[0];\n    if (offerOptions) {\n      // Reject Chrome legacy constraints.\n      if (offerOptions.mandatory || offerOptions.optional) {\n        throw new TypeError(\n            'Legacy mandatory/optional constraints not supported.');\n      }\n      if (offerOptions.offerToReceiveAudio !== undefined) {\n        if (offerOptions.offerToReceiveAudio === true) {\n          numAudioTracks = 1;\n        } else if (offerOptions.offerToReceiveAudio === false) {\n          numAudioTracks = 0;\n        } else {\n          numAudioTracks = offerOptions.offerToReceiveAudio;\n        }\n      }\n      if (offerOptions.offerToReceiveVideo !== undefined) {\n        if (offerOptions.offerToReceiveVideo === true) {\n          numVideoTracks = 1;\n        } else if (offerOptions.offerToReceiveVideo === false) {\n          numVideoTracks = 0;\n        } else {\n          numVideoTracks = offerOptions.offerToReceiveVideo;\n        }\n      }\n    }\n\n    pc.transceivers.forEach(function(transceiver) {\n      if (transceiver.kind === 'audio') {\n        numAudioTracks--;\n        if (numAudioTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      } else if (transceiver.kind === 'video') {\n        numVideoTracks--;\n        if (numVideoTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      }\n    });\n\n    // Create M-lines for recvonly streams.\n    while (numAudioTracks > 0 || numVideoTracks > 0) {\n      if (numAudioTracks > 0) {\n        pc._createTransceiver('audio');\n        numAudioTracks--;\n      }\n      if (numVideoTracks > 0) {\n        pc._createTransceiver('video');\n        numVideoTracks--;\n      }\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      // For each track, create an ice gatherer, ice transport,\n      // dtls transport, potentially rtpsender and rtpreceiver.\n      var track = transceiver.track;\n      var kind = transceiver.kind;\n      var mid = transceiver.mid || SDPUtils.generateIdentifier();\n      transceiver.mid = mid;\n\n      if (!transceiver.iceGatherer) {\n        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n            pc.usingBundle);\n      }\n\n      var localCapabilities = window.RTCRtpSender.getCapabilities(kind);\n      // filter RTX until additional stuff needed for RTX is implemented\n      // in adapter.js\n      if (edgeVersion < 15019) {\n        localCapabilities.codecs = localCapabilities.codecs.filter(\n            function(codec) {\n              return codec.name !== 'rtx';\n            });\n      }\n      localCapabilities.codecs.forEach(function(codec) {\n        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552\n        // by adding level-asymmetry-allowed=1\n        if (codec.name === 'H264' &&\n            codec.parameters['level-asymmetry-allowed'] === undefined) {\n          codec.parameters['level-asymmetry-allowed'] = '1';\n        }\n\n        // for subsequent offers, we might have to re-use the payload\n        // type of the last offer.\n        if (transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.codecs) {\n          transceiver.remoteCapabilities.codecs.forEach(function(remoteCodec) {\n            if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() &&\n                codec.clockRate === remoteCodec.clockRate) {\n              codec.preferredPayloadType = remoteCodec.payloadType;\n            }\n          });\n        }\n      });\n      localCapabilities.headerExtensions.forEach(function(hdrExt) {\n        var remoteExtensions = transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.headerExtensions || [];\n        remoteExtensions.forEach(function(rHdrExt) {\n          if (hdrExt.uri === rHdrExt.uri) {\n            hdrExt.id = rHdrExt.id;\n          }\n        });\n      });\n\n      // generate an ssrc now, to be used later in rtpSender.send\n      var sendEncodingParameters = transceiver.sendEncodingParameters || [{\n        ssrc: (2 * sdpMLineIndex + 1) * 1001\n      }];\n      if (track) {\n        // add RTX\n        if (edgeVersion >= 15019 && kind === 'video' &&\n            !sendEncodingParameters[0].rtx) {\n          sendEncodingParameters[0].rtx = {\n            ssrc: sendEncodingParameters[0].ssrc + 1\n          };\n        }\n      }\n\n      if (transceiver.wantReceive) {\n        transceiver.rtpReceiver = new window.RTCRtpReceiver(\n            transceiver.dtlsTransport, kind);\n      }\n\n      transceiver.localCapabilities = localCapabilities;\n      transceiver.sendEncodingParameters = sendEncodingParameters;\n    });\n\n    // always offer BUNDLE and dispose on return if not supported.\n    if (pc._config.bundlePolicy !== 'max-compat') {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      sdp += writeMediaSection(transceiver, transceiver.localCapabilities,\n          'offer', transceiver.stream, pc._dtlsRole);\n      sdp += 'a=rtcp-rsize\\r\\n';\n\n      if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' &&\n          (sdpMLineIndex === 0 || !pc.usingBundle)) {\n        transceiver.iceGatherer.getLocalCandidates().forEach(function(cand) {\n          cand.component = 1;\n          sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\\r\\n';\n        });\n\n        if (transceiver.iceGatherer.state === 'completed') {\n          sdp += 'a=end-of-candidates\\r\\n';\n        }\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'offer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.createAnswer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer after close'));\n    }\n\n    if (!(pc.signalingState === 'have-remote-offer' ||\n        pc.signalingState === 'have-local-pranswer')) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer in signalingState ' + pc.signalingState));\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    if (pc.usingBundle) {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    var mediaSectionsInOffer = SDPUtils.getMediaSections(\n        pc._remoteDescription.sdp).length;\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      if (sdpMLineIndex + 1 > mediaSectionsInOffer) {\n        return;\n      }\n      if (transceiver.rejected) {\n        if (transceiver.kind === 'application') {\n          if (transceiver.protocol === 'DTLS/SCTP') { // legacy fmt\n            sdp += 'm=application 0 DTLS/SCTP 5000\\r\\n';\n          } else {\n            sdp += 'm=application 0 ' + transceiver.protocol +\n                ' webrtc-datachannel\\r\\n';\n          }\n        } else if (transceiver.kind === 'audio') {\n          sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\\r\\n' +\n              'a=rtpmap:0 PCMU/8000\\r\\n';\n        } else if (transceiver.kind === 'video') {\n          sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\\r\\n' +\n              'a=rtpmap:120 VP8/90000\\r\\n';\n        }\n        sdp += 'c=IN IP4 0.0.0.0\\r\\n' +\n            'a=inactive\\r\\n' +\n            'a=mid:' + transceiver.mid + '\\r\\n';\n        return;\n      }\n\n      // FIXME: look at direction.\n      if (transceiver.stream) {\n        var localTrack;\n        if (transceiver.kind === 'audio') {\n          localTrack = transceiver.stream.getAudioTracks()[0];\n        } else if (transceiver.kind === 'video') {\n          localTrack = transceiver.stream.getVideoTracks()[0];\n        }\n        if (localTrack) {\n          // add RTX\n          if (edgeVersion >= 15019 && transceiver.kind === 'video' &&\n              !transceiver.sendEncodingParameters[0].rtx) {\n            transceiver.sendEncodingParameters[0].rtx = {\n              ssrc: transceiver.sendEncodingParameters[0].ssrc + 1\n            };\n          }\n        }\n      }\n\n      // Calculate intersection of capabilities.\n      var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n      var hasRtx = commonCapabilities.codecs.filter(function(c) {\n        return c.name.toLowerCase() === 'rtx';\n      }).length;\n      if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n        delete transceiver.sendEncodingParameters[0].rtx;\n      }\n\n      sdp += writeMediaSection(transceiver, commonCapabilities,\n          'answer', transceiver.stream, pc._dtlsRole);\n      if (transceiver.rtcpParameters &&\n          transceiver.rtcpParameters.reducedSize) {\n        sdp += 'a=rtcp-rsize\\r\\n';\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'answer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.addIceCandidate = function(candidate) {\n    var pc = this;\n    var sections;\n    if (candidate && !(candidate.sdpMLineIndex !== undefined ||\n        candidate.sdpMid)) {\n      return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));\n    }\n\n    // TODO: needs to go into ops queue.\n    return new Promise(function(resolve, reject) {\n      if (!pc._remoteDescription) {\n        return reject(makeError('InvalidStateError',\n            'Can not add ICE candidate without a remote description'));\n      } else if (!candidate || candidate.candidate === '') {\n        for (var j = 0; j < pc.transceivers.length; j++) {\n          if (pc.transceivers[j].rejected) {\n            continue;\n          }\n          pc.transceivers[j].iceTransport.addRemoteCandidate({});\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[j] += 'a=end-of-candidates\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n          if (pc.usingBundle) {\n            break;\n          }\n        }\n      } else {\n        var sdpMLineIndex = candidate.sdpMLineIndex;\n        if (candidate.sdpMid) {\n          for (var i = 0; i < pc.transceivers.length; i++) {\n            if (pc.transceivers[i].mid === candidate.sdpMid) {\n              sdpMLineIndex = i;\n              break;\n            }\n          }\n        }\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        if (transceiver) {\n          if (transceiver.rejected) {\n            return resolve();\n          }\n          var cand = Object.keys(candidate.candidate).length > 0 ?\n              SDPUtils.parseCandidate(candidate.candidate) : {};\n          // Ignore Chrome's invalid candidates since Edge does not like them.\n          if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {\n            return resolve();\n          }\n          // Ignore RTCP candidates, we assume RTCP-MUX.\n          if (cand.component && cand.component !== 1) {\n            return resolve();\n          }\n          // when using bundle, avoid adding candidates to the wrong\n          // ice transport. And avoid adding candidates added in the SDP.\n          if (sdpMLineIndex === 0 || (sdpMLineIndex > 0 &&\n              transceiver.iceTransport !== pc.transceivers[0].iceTransport)) {\n            if (!maybeAddCandidate(transceiver.iceTransport, cand)) {\n              return reject(makeError('OperationError',\n                  'Can not add ICE candidate'));\n            }\n          }\n\n          // update the remoteDescription.\n          var candidateString = candidate.candidate.trim();\n          if (candidateString.indexOf('a=') === 0) {\n            candidateString = candidateString.substr(2);\n          }\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[sdpMLineIndex] += 'a=' +\n              (cand.type ? candidateString : 'end-of-candidates')\n              + '\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n        } else {\n          return reject(makeError('OperationError',\n              'Can not add ICE candidate'));\n        }\n      }\n      resolve();\n    });\n  };\n\n  RTCPeerConnection.prototype.getStats = function(selector) {\n    if (selector && selector instanceof window.MediaStreamTrack) {\n      var senderOrReceiver = null;\n      this.transceivers.forEach(function(transceiver) {\n        if (transceiver.rtpSender &&\n            transceiver.rtpSender.track === selector) {\n          senderOrReceiver = transceiver.rtpSender;\n        } else if (transceiver.rtpReceiver &&\n            transceiver.rtpReceiver.track === selector) {\n          senderOrReceiver = transceiver.rtpReceiver;\n        }\n      });\n      if (!senderOrReceiver) {\n        throw makeError('InvalidAccessError', 'Invalid selector.');\n      }\n      return senderOrReceiver.getStats();\n    }\n\n    var promises = [];\n    this.transceivers.forEach(function(transceiver) {\n      ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',\n          'dtlsTransport'].forEach(function(method) {\n            if (transceiver[method]) {\n              promises.push(transceiver[method].getStats());\n            }\n          });\n    });\n    return Promise.all(promises).then(function(allStats) {\n      var results = new Map();\n      allStats.forEach(function(stats) {\n        stats.forEach(function(stat) {\n          results.set(stat.id, stat);\n        });\n      });\n      return results;\n    });\n  };\n\n  // fix low-level stat names and return Map instead of object.\n  var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer',\n    'RTCIceTransport', 'RTCDtlsTransport'];\n  ortcObjects.forEach(function(ortcObjectName) {\n    var obj = window[ortcObjectName];\n    if (obj && obj.prototype && obj.prototype.getStats) {\n      var nativeGetstats = obj.prototype.getStats;\n      obj.prototype.getStats = function() {\n        return nativeGetstats.apply(this)\n        .then(function(nativeStats) {\n          var mapStats = new Map();\n          Object.keys(nativeStats).forEach(function(id) {\n            nativeStats[id].type = fixStatsType(nativeStats[id]);\n            mapStats.set(id, nativeStats[id]);\n          });\n          return mapStats;\n        });\n      };\n    }\n  });\n\n  // legacy callback shims. Should be moved to adapter.js some days.\n  var methods = ['createOffer', 'createAnswer'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[0] === 'function' ||\n          typeof args[1] === 'function') { // legacy\n        return nativeMethod.apply(this, [arguments[2]])\n        .then(function(description) {\n          if (typeof args[0] === 'function') {\n            args[0].apply(null, [description]);\n          }\n        }, function(error) {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function' ||\n          typeof args[2] === 'function') { // legacy\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        }, function(error) {\n          if (typeof args[2] === 'function') {\n            args[2].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  // getStats is special. It doesn't have a spec legacy method yet we support\n  // getStats(something, cb) without error callbacks.\n  ['getStats'].forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function') {\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  return RTCPeerConnection;\n};\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  const shimError_ = function(e) {\n    return {\n      name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint,\n      toString() {\n        return this.name;\n      }\n    };\n  };\n\n  // getUserMedia error shim.\n  const origGetUserMedia = navigator.mediaDevices.getUserMedia.\n      bind(navigator.mediaDevices);\n  navigator.mediaDevices.getUserMedia = function(c) {\n    return origGetUserMedia(c).catch(e => Promise.reject(shimError_(e)));\n  };\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nexport function shimGetDisplayMedia(window) {\n  if (!('getDisplayMedia' in window.navigator)) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    window.navigator.getDisplayMedia.bind(window.navigator);\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\nimport {filterIceServers} from './filtericeservers';\nimport shimRTCPeerConnection from 'rtcpeerconnection-shim';\n\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimPeerConnection(window, browserDetails) {\n  if (window.RTCIceGatherer) {\n    if (!window.RTCIceCandidate) {\n      window.RTCIceCandidate = function RTCIceCandidate(args) {\n        return args;\n      };\n    }\n    if (!window.RTCSessionDescription) {\n      window.RTCSessionDescription = function RTCSessionDescription(args) {\n        return args;\n      };\n    }\n    // this adds an additional event listener to MediaStrackTrack that signals\n    // when a tracks enabled property was changed. Workaround for a bug in\n    // addStream, see below. No longer required in 15025+\n    if (browserDetails.version < 15025) {\n      const origMSTEnabled = Object.getOwnPropertyDescriptor(\n          window.MediaStreamTrack.prototype, 'enabled');\n      Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {\n        set(value) {\n          origMSTEnabled.set.call(this, value);\n          const ev = new Event('enabled');\n          ev.enabled = value;\n          this.dispatchEvent(ev);\n        }\n      });\n    }\n  }\n\n  // ORTC defines the DTMF sender a bit different.\n  // https://github.com/w3c/ortc/issues/714\n  if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = new window.RTCDtmfSender(this);\n          } else if (this.track.kind === 'video') {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n  // Edge currently only implements the RTCDtmfSender, not the\n  // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*\n  if (window.RTCDtmfSender && !window.RTCDTMFSender) {\n    window.RTCDTMFSender = window.RTCDtmfSender;\n  }\n\n  const RTCPeerConnectionShim = shimRTCPeerConnection(window,\n      browserDetails.version);\n  window.RTCPeerConnection = function RTCPeerConnection(config) {\n    if (config && config.iceServers) {\n      config.iceServers = filterIceServers(config.iceServers,\n        browserDetails.version);\n      utils.log('ICE servers after filtering:', config.iceServers);\n    }\n    return new RTCPeerConnectionShim(config);\n  };\n  window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;\n}\n\nexport function shimReplaceTrack(window) {\n  // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614\n  if (window.RTCRtpSender &&\n      !('replaceTrack' in window.RTCRtpSender.prototype)) {\n    window.RTCRtpSender.prototype.replaceTrack =\n        window.RTCRtpSender.prototype.setTrack;\n  }\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\n\nexport function shimGetUserMedia(window, browserDetails) {\n  const navigator = window && window.navigator;\n  const MediaStreamTrack = window && window.MediaStreamTrack;\n\n  navigator.getUserMedia = function(constraints, onSuccess, onError) {\n    // Replace Firefox 44+'s deprecation warning with unprefixed version.\n    utils.deprecated('navigator.getUserMedia',\n        'navigator.mediaDevices.getUserMedia');\n    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);\n  };\n\n  if (!(browserDetails.version > 55 &&\n      'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {\n    const remap = function(obj, a, b) {\n      if (a in obj && !(b in obj)) {\n        obj[b] = obj[a];\n        delete obj[a];\n      }\n    };\n\n    const nativeGetUserMedia = navigator.mediaDevices.getUserMedia.\n        bind(navigator.mediaDevices);\n    navigator.mediaDevices.getUserMedia = function(c) {\n      if (typeof c === 'object' && typeof c.audio === 'object') {\n        c = JSON.parse(JSON.stringify(c));\n        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');\n        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');\n      }\n      return nativeGetUserMedia(c);\n    };\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {\n      const nativeGetSettings = MediaStreamTrack.prototype.getSettings;\n      MediaStreamTrack.prototype.getSettings = function() {\n        const obj = nativeGetSettings.apply(this, arguments);\n        remap(obj, 'mozAutoGainControl', 'autoGainControl');\n        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');\n        return obj;\n      };\n    }\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {\n      const nativeApplyConstraints =\n        MediaStreamTrack.prototype.applyConstraints;\n      MediaStreamTrack.prototype.applyConstraints = function(c) {\n        if (this.kind === 'audio' && typeof c === 'object') {\n          c = JSON.parse(JSON.stringify(c));\n          remap(c, 'autoGainControl', 'mozAutoGainControl');\n          remap(c, 'noiseSuppression', 'mozNoiseSuppression');\n        }\n        return nativeApplyConstraints.apply(this, [c]);\n      };\n    }\n  }\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nexport function shimGetDisplayMedia(window, preferredMediaSource) {\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    function getDisplayMedia(constraints) {\n      if (!(constraints && constraints.video)) {\n        const err = new DOMException('getDisplayMedia without video ' +\n            'constraints is undefined');\n        err.name = 'NotFoundError';\n        // from https://heycam.github.io/webidl/#idl-DOMException-error-names\n        err.code = 8;\n        return Promise.reject(err);\n      }\n      if (constraints.video === true) {\n        constraints.video = {mediaSource: preferredMediaSource};\n      } else {\n        constraints.video.mediaSource = preferredMediaSource;\n      }\n      return window.navigator.mediaDevices.getUserMedia(constraints);\n    };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimOnTrack(window) {\n  if (typeof window === 'object' && window.RTCTrackEvent &&\n      ('receiver' in window.RTCTrackEvent.prototype) &&\n      !('transceiver' in window.RTCTrackEvent.prototype)) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get() {\n        return {receiver: this.receiver};\n      }\n    });\n  }\n}\n\nexport function shimPeerConnection(window, browserDetails) {\n  if (typeof window !== 'object' ||\n      !(window.RTCPeerConnection || window.mozRTCPeerConnection)) {\n    return; // probably media.peerconnection.enabled=false in about:config\n  }\n  if (!window.RTCPeerConnection && window.mozRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.mozRTCPeerConnection;\n  }\n\n  if (browserDetails.version < 53) {\n    // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.\n    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n        .forEach(function(method) {\n          const nativeMethod = window.RTCPeerConnection.prototype[method];\n          const methodObj = {[method]() {\n            arguments[0] = new ((method === 'addIceCandidate') ?\n                window.RTCIceCandidate :\n                window.RTCSessionDescription)(arguments[0]);\n            return nativeMethod.apply(this, arguments);\n          }};\n          window.RTCPeerConnection.prototype[method] = methodObj[method];\n        });\n  }\n\n  const modernStatsTypes = {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  };\n\n  const nativeGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    const [selector, onSucc, onErr] = arguments;\n    return nativeGetStats.apply(this, [selector || null])\n      .then(stats => {\n        if (browserDetails.version < 53 && !onSucc) {\n          // Shim only promise getStats with spec-hyphens in type names\n          // Leave callback version alone; misc old uses of forEach before Map\n          try {\n            stats.forEach(stat => {\n              stat.type = modernStatsTypes[stat.type] || stat.type;\n            });\n          } catch (e) {\n            if (e.name !== 'TypeError') {\n              throw e;\n            }\n            // Avoid TypeError: \"type\" is read-only, in old versions. 34-43ish\n            stats.forEach((stat, i) => {\n              stats.set(i, Object.assign({}, stat, {\n                type: modernStatsTypes[stat.type] || stat.type\n              }));\n            });\n          }\n        }\n        return stats;\n      })\n      .then(onSucc, onErr);\n  };\n}\n\nexport function shimSenderGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {\n    return;\n  }\n  const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n  if (origGetSenders) {\n    window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n      const senders = origGetSenders.apply(this, []);\n      senders.forEach(sender => sender._pc = this);\n      return senders;\n    };\n  }\n\n  const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  if (origAddTrack) {\n    window.RTCPeerConnection.prototype.addTrack = function addTrack() {\n      const sender = origAddTrack.apply(this, arguments);\n      sender._pc = this;\n      return sender;\n    };\n  }\n  window.RTCRtpSender.prototype.getStats = function getStats() {\n    return this.track ? this._pc.getStats(this.track) :\n        Promise.resolve(new Map());\n  };\n}\n\nexport function shimReceiverGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {\n    return;\n  }\n  const origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n  if (origGetReceivers) {\n    window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {\n      const receivers = origGetReceivers.apply(this, []);\n      receivers.forEach(receiver => receiver._pc = this);\n      return receivers;\n    };\n  }\n  utils.wrapPeerConnectionEvent(window, 'track', e => {\n    e.receiver._pc = e.srcElement;\n    return e;\n  });\n  window.RTCRtpReceiver.prototype.getStats = function getStats() {\n    return this._pc.getStats(this.track);\n  };\n}\n\nexport function shimRemoveStream(window) {\n  if (!window.RTCPeerConnection ||\n      'removeStream' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  window.RTCPeerConnection.prototype.removeStream =\n    function removeStream(stream) {\n      utils.deprecated('removeStream', 'removeTrack');\n      this.getSenders().forEach(sender => {\n        if (sender.track && stream.getTracks().includes(sender.track)) {\n          this.removeTrack(sender);\n        }\n      });\n    };\n}\n\nexport function shimRTCDataChannel(window) {\n  // rename DataChannel to RTCDataChannel (native fix in FF60):\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851\n  if (window.DataChannel && !window.RTCDataChannel) {\n    window.RTCDataChannel = window.DataChannel;\n  }\n}\n\nexport function shimAddTransceiver(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!(typeof window === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  const origAddTransceiver = window.RTCPeerConnection.prototype.addTransceiver;\n  if (origAddTransceiver) {\n    window.RTCPeerConnection.prototype.addTransceiver =\n      function addTransceiver() {\n        this.setParametersPromises = [];\n        const initParameters = arguments[1];\n        const shouldPerformCheck = initParameters &&\n                                  'sendEncodings' in initParameters;\n        if (shouldPerformCheck) {\n          // If sendEncodings params are provided, validate grammar\n          initParameters.sendEncodings.forEach((encodingParam) => {\n            if ('rid' in encodingParam) {\n              const ridRegex = /^[a-z0-9]{0,16}$/i;\n              if (!ridRegex.test(encodingParam.rid)) {\n                throw new TypeError('Invalid RID value provided.');\n              }\n            }\n            if ('scaleResolutionDownBy' in encodingParam) {\n              if (!(parseFloat(encodingParam.scaleResolutionDownBy) >= 1.0)) {\n                throw new RangeError('scale_resolution_down_by must be >= 1.0');\n              }\n            }\n            if ('maxFramerate' in encodingParam) {\n              if (!(parseFloat(encodingParam.maxFramerate) >= 0)) {\n                throw new RangeError('max_framerate must be >= 0.0');\n              }\n            }\n          });\n        }\n        const transceiver = origAddTransceiver.apply(this, arguments);\n        if (shouldPerformCheck) {\n          // Check if the init options were applied. If not we do this in an\n          // asynchronous way and save the promise reference in a global object.\n          // This is an ugly hack, but at the same time is way more robust than\n          // checking the sender parameters before and after the createOffer\n          // Also note that after the createoffer we are not 100% sure that\n          // the params were asynchronously applied so we might miss the\n          // opportunity to recreate offer.\n          const {sender} = transceiver;\n          const params = sender.getParameters();\n          if (!('encodings' in params) ||\n              // Avoid being fooled by patched getParameters() below.\n              (params.encodings.length === 1 &&\n               Object.keys(params.encodings[0]).length === 0)) {\n            params.encodings = initParameters.sendEncodings;\n            sender.sendEncodings = initParameters.sendEncodings;\n            this.setParametersPromises.push(sender.setParameters(params)\n              .then(() => {\n                delete sender.sendEncodings;\n              }).catch(() => {\n                delete sender.sendEncodings;\n              })\n            );\n          }\n        }\n        return transceiver;\n      };\n  }\n}\n\nexport function shimGetParameters(window) {\n  if (!(typeof window === 'object' && window.RTCRtpSender)) {\n    return;\n  }\n  const origGetParameters = window.RTCRtpSender.prototype.getParameters;\n  if (origGetParameters) {\n    window.RTCRtpSender.prototype.getParameters =\n      function getParameters() {\n        const params = origGetParameters.apply(this, arguments);\n        if (!('encodings' in params)) {\n          params.encodings = [].concat(this.sendEncodings || [{}]);\n        }\n        return params;\n      };\n  }\n}\n\nexport function shimCreateOffer(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!(typeof window === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  const origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n  window.RTCPeerConnection.prototype.createOffer = function createOffer() {\n    if (this.setParametersPromises && this.setParametersPromises.length) {\n      return Promise.all(this.setParametersPromises)\n      .then(() => {\n        return origCreateOffer.apply(this, arguments);\n      })\n      .finally(() => {\n        this.setParametersPromises = [];\n      });\n    }\n    return origCreateOffer.apply(this, arguments);\n  };\n}\n\nexport function shimCreateAnswer(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!(typeof window === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  const origCreateAnswer = window.RTCPeerConnection.prototype.createAnswer;\n  window.RTCPeerConnection.prototype.createAnswer = function createAnswer() {\n    if (this.setParametersPromises && this.setParametersPromises.length) {\n      return Promise.all(this.setParametersPromises)\n      .then(() => {\n        return origCreateAnswer.apply(this, arguments);\n      })\n      .finally(() => {\n        this.setParametersPromises = [];\n      });\n    }\n    return origCreateAnswer.apply(this, arguments);\n  };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n'use strict';\nimport * as utils from '../utils';\n\nexport function shimLocalStreamsAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getLocalStreams =\n      function getLocalStreams() {\n        if (!this._localStreams) {\n          this._localStreams = [];\n        }\n        return this._localStreams;\n      };\n  }\n  if (!('addStream' in window.RTCPeerConnection.prototype)) {\n    const _addTrack = window.RTCPeerConnection.prototype.addTrack;\n    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      if (!this._localStreams.includes(stream)) {\n        this._localStreams.push(stream);\n      }\n      // Try to emulate Chrome's behaviour of adding in audio-video order.\n      // Safari orders by track id.\n      stream.getAudioTracks().forEach(track => _addTrack.call(this, track,\n        stream));\n      stream.getVideoTracks().forEach(track => _addTrack.call(this, track,\n        stream));\n    };\n\n    window.RTCPeerConnection.prototype.addTrack =\n      function addTrack(track, ...streams) {\n        if (streams) {\n          streams.forEach((stream) => {\n            if (!this._localStreams) {\n              this._localStreams = [stream];\n            } else if (!this._localStreams.includes(stream)) {\n              this._localStreams.push(stream);\n            }\n          });\n        }\n        return _addTrack.apply(this, arguments);\n      };\n  }\n  if (!('removeStream' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.removeStream =\n      function removeStream(stream) {\n        if (!this._localStreams) {\n          this._localStreams = [];\n        }\n        const index = this._localStreams.indexOf(stream);\n        if (index === -1) {\n          return;\n        }\n        this._localStreams.splice(index, 1);\n        const tracks = stream.getTracks();\n        this.getSenders().forEach(sender => {\n          if (tracks.includes(sender.track)) {\n            this.removeTrack(sender);\n          }\n        });\n      };\n  }\n}\n\nexport function shimRemoteStreamsAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getRemoteStreams =\n      function getRemoteStreams() {\n        return this._remoteStreams ? this._remoteStreams : [];\n      };\n  }\n  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {\n      get() {\n        return this._onaddstream;\n      },\n      set(f) {\n        if (this._onaddstream) {\n          this.removeEventListener('addstream', this._onaddstream);\n          this.removeEventListener('track', this._onaddstreampoly);\n        }\n        this.addEventListener('addstream', this._onaddstream = f);\n        this.addEventListener('track', this._onaddstreampoly = (e) => {\n          e.streams.forEach(stream => {\n            if (!this._remoteStreams) {\n              this._remoteStreams = [];\n            }\n            if (this._remoteStreams.includes(stream)) {\n              return;\n            }\n            this._remoteStreams.push(stream);\n            const event = new Event('addstream');\n            event.stream = stream;\n            this.dispatchEvent(event);\n          });\n        });\n      }\n    });\n    const origSetRemoteDescription =\n      window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription =\n      function setRemoteDescription() {\n        const pc = this;\n        if (!this._onaddstreampoly) {\n          this.addEventListener('track', this._onaddstreampoly = function(e) {\n            e.streams.forEach(stream => {\n              if (!pc._remoteStreams) {\n                pc._remoteStreams = [];\n              }\n              if (pc._remoteStreams.indexOf(stream) >= 0) {\n                return;\n              }\n              pc._remoteStreams.push(stream);\n              const event = new Event('addstream');\n              event.stream = stream;\n              pc.dispatchEvent(event);\n            });\n          });\n        }\n        return origSetRemoteDescription.apply(pc, arguments);\n      };\n  }\n}\n\nexport function shimCallbacksAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  const prototype = window.RTCPeerConnection.prototype;\n  const origCreateOffer = prototype.createOffer;\n  const origCreateAnswer = prototype.createAnswer;\n  const setLocalDescription = prototype.setLocalDescription;\n  const setRemoteDescription = prototype.setRemoteDescription;\n  const addIceCandidate = prototype.addIceCandidate;\n\n  prototype.createOffer =\n    function createOffer(successCallback, failureCallback) {\n      const options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n      const promise = origCreateOffer.apply(this, [options]);\n      if (!failureCallback) {\n        return promise;\n      }\n      promise.then(successCallback, failureCallback);\n      return Promise.resolve();\n    };\n\n  prototype.createAnswer =\n    function createAnswer(successCallback, failureCallback) {\n      const options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n      const promise = origCreateAnswer.apply(this, [options]);\n      if (!failureCallback) {\n        return promise;\n      }\n      promise.then(successCallback, failureCallback);\n      return Promise.resolve();\n    };\n\n  let withCallback = function(description, successCallback, failureCallback) {\n    const promise = setLocalDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setLocalDescription = withCallback;\n\n  withCallback = function(description, successCallback, failureCallback) {\n    const promise = setRemoteDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setRemoteDescription = withCallback;\n\n  withCallback = function(candidate, successCallback, failureCallback) {\n    const promise = addIceCandidate.apply(this, [candidate]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.addIceCandidate = withCallback;\n}\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {\n    // shim not needed in Safari 12.1\n    const mediaDevices = navigator.mediaDevices;\n    const _getUserMedia = mediaDevices.getUserMedia.bind(mediaDevices);\n    navigator.mediaDevices.getUserMedia = (constraints) => {\n      return _getUserMedia(shimConstraints(constraints));\n    };\n  }\n\n  if (!navigator.getUserMedia && navigator.mediaDevices &&\n    navigator.mediaDevices.getUserMedia) {\n    navigator.getUserMedia = function getUserMedia(constraints, cb, errcb) {\n      navigator.mediaDevices.getUserMedia(constraints)\n      .then(cb, errcb);\n    }.bind(navigator);\n  }\n}\n\nexport function shimConstraints(constraints) {\n  if (constraints && constraints.video !== undefined) {\n    return Object.assign({},\n      constraints,\n      {video: utils.compactObject(constraints.video)}\n    );\n  }\n\n  return constraints;\n}\n\nexport function shimRTCIceServerUrls(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  // migrate from non-spec RTCIceServer.url to RTCIceServer.urls\n  const OrigPeerConnection = window.RTCPeerConnection;\n  window.RTCPeerConnection =\n    function RTCPeerConnection(pcConfig, pcConstraints) {\n      if (pcConfig && pcConfig.iceServers) {\n        const newIceServers = [];\n        for (let i = 0; i < pcConfig.iceServers.length; i++) {\n          let server = pcConfig.iceServers[i];\n          if (!server.hasOwnProperty('urls') &&\n              server.hasOwnProperty('url')) {\n            utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n            server = JSON.parse(JSON.stringify(server));\n            server.urls = server.url;\n            delete server.url;\n            newIceServers.push(server);\n          } else {\n            newIceServers.push(pcConfig.iceServers[i]);\n          }\n        }\n        pcConfig.iceServers = newIceServers;\n      }\n      return new OrigPeerConnection(pcConfig, pcConstraints);\n    };\n  window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;\n  // wrap static methods. Currently just generateCertificate.\n  if ('generateCertificate' in OrigPeerConnection) {\n    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n      get() {\n        return OrigPeerConnection.generateCertificate;\n      }\n    });\n  }\n}\n\nexport function shimTrackEventTransceiver(window) {\n  // Add event.transceiver member over deprecated event.receiver\n  if (typeof window === 'object' && window.RTCTrackEvent &&\n      'receiver' in window.RTCTrackEvent.prototype &&\n      !('transceiver' in window.RTCTrackEvent.prototype)) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get() {\n        return {receiver: this.receiver};\n      }\n    });\n  }\n}\n\nexport function shimCreateOfferLegacy(window) {\n  const origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n  window.RTCPeerConnection.prototype.createOffer =\n    function createOffer(offerOptions) {\n      if (offerOptions) {\n        if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {\n          // support bit values\n          offerOptions.offerToReceiveAudio =\n            !!offerOptions.offerToReceiveAudio;\n        }\n        const audioTransceiver = this.getTransceivers().find(transceiver =>\n          transceiver.receiver.track.kind === 'audio');\n        if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {\n          if (audioTransceiver.direction === 'sendrecv') {\n            if (audioTransceiver.setDirection) {\n              audioTransceiver.setDirection('sendonly');\n            } else {\n              audioTransceiver.direction = 'sendonly';\n            }\n          } else if (audioTransceiver.direction === 'recvonly') {\n            if (audioTransceiver.setDirection) {\n              audioTransceiver.setDirection('inactive');\n            } else {\n              audioTransceiver.direction = 'inactive';\n            }\n          }\n        } else if (offerOptions.offerToReceiveAudio === true &&\n            !audioTransceiver) {\n          this.addTransceiver('audio');\n        }\n\n        if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {\n          // support bit values\n          offerOptions.offerToReceiveVideo =\n            !!offerOptions.offerToReceiveVideo;\n        }\n        const videoTransceiver = this.getTransceivers().find(transceiver =>\n          transceiver.receiver.track.kind === 'video');\n        if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {\n          if (videoTransceiver.direction === 'sendrecv') {\n            if (videoTransceiver.setDirection) {\n              videoTransceiver.setDirection('sendonly');\n            } else {\n              videoTransceiver.direction = 'sendonly';\n            }\n          } else if (videoTransceiver.direction === 'recvonly') {\n            if (videoTransceiver.setDirection) {\n              videoTransceiver.setDirection('inactive');\n            } else {\n              videoTransceiver.direction = 'inactive';\n            }\n          }\n        } else if (offerOptions.offerToReceiveVideo === true &&\n            !videoTransceiver) {\n          this.addTransceiver('video');\n        }\n      }\n      return origCreateOffer.apply(this, arguments);\n    };\n}\n\nexport function shimAudioContext(window) {\n  if (typeof window !== 'object' || window.AudioContext) {\n    return;\n  }\n  window.AudioContext = window.webkitAudioContext;\n}\n","/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport SDPUtils from 'sdp';\nimport * as utils from './utils';\n\nexport function shimRTCIceCandidate(window) {\n  // foundation is arbitrarily chosen as an indicator for full support for\n  // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface\n  if (!window.RTCIceCandidate || (window.RTCIceCandidate && 'foundation' in\n      window.RTCIceCandidate.prototype)) {\n    return;\n  }\n\n  const NativeRTCIceCandidate = window.RTCIceCandidate;\n  window.RTCIceCandidate = function RTCIceCandidate(args) {\n    // Remove the a= which shouldn't be part of the candidate string.\n    if (typeof args === 'object' && args.candidate &&\n        args.candidate.indexOf('a=') === 0) {\n      args = JSON.parse(JSON.stringify(args));\n      args.candidate = args.candidate.substr(2);\n    }\n\n    if (args.candidate && args.candidate.length) {\n      // Augment the native candidate with the parsed fields.\n      const nativeCandidate = new NativeRTCIceCandidate(args);\n      const parsedCandidate = SDPUtils.parseCandidate(args.candidate);\n      const augmentedCandidate = Object.assign(nativeCandidate,\n          parsedCandidate);\n\n      // Add a serializer that does not serialize the extra attributes.\n      augmentedCandidate.toJSON = function toJSON() {\n        return {\n          candidate: augmentedCandidate.candidate,\n          sdpMid: augmentedCandidate.sdpMid,\n          sdpMLineIndex: augmentedCandidate.sdpMLineIndex,\n          usernameFragment: augmentedCandidate.usernameFragment,\n        };\n      };\n      return augmentedCandidate;\n    }\n    return new NativeRTCIceCandidate(args);\n  };\n  window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype;\n\n  // Hook up the augmented candidate in onicecandidate and\n  // addEventListener('icecandidate', ...)\n  utils.wrapPeerConnectionEvent(window, 'icecandidate', e => {\n    if (e.candidate) {\n      Object.defineProperty(e, 'candidate', {\n        value: new window.RTCIceCandidate(e.candidate),\n        writable: 'false'\n      });\n    }\n    return e;\n  });\n}\n\nexport function shimMaxMessageSize(window, browserDetails) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  if (!('sctp' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {\n      get() {\n        return typeof this._sctp === 'undefined' ? null : this._sctp;\n      }\n    });\n  }\n\n  const sctpInDescription = function(description) {\n    if (!description || !description.sdp) {\n      return false;\n    }\n    const sections = SDPUtils.splitSections(description.sdp);\n    sections.shift();\n    return sections.some(mediaSection => {\n      const mLine = SDPUtils.parseMLine(mediaSection);\n      return mLine && mLine.kind === 'application'\n          && mLine.protocol.indexOf('SCTP') !== -1;\n    });\n  };\n\n  const getRemoteFirefoxVersion = function(description) {\n    // TODO: Is there a better solution for detecting Firefox?\n    const match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\\d+)/);\n    if (match === null || match.length < 2) {\n      return -1;\n    }\n    const version = parseInt(match[1], 10);\n    // Test for NaN (yes, this is ugly)\n    return version !== version ? -1 : version;\n  };\n\n  const getCanSendMaxMessageSize = function(remoteIsFirefox) {\n    // Every implementation we know can send at least 64 KiB.\n    // Note: Although Chrome is technically able to send up to 256 KiB, the\n    //       data does not reach the other peer reliably.\n    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419\n    let canSendMaxMessageSize = 65536;\n    if (browserDetails.browser === 'firefox') {\n      if (browserDetails.version < 57) {\n        if (remoteIsFirefox === -1) {\n          // FF < 57 will send in 16 KiB chunks using the deprecated PPID\n          // fragmentation.\n          canSendMaxMessageSize = 16384;\n        } else {\n          // However, other FF (and RAWRTC) can reassemble PPID-fragmented\n          // messages. Thus, supporting ~2 GiB when sending.\n          canSendMaxMessageSize = 2147483637;\n        }\n      } else if (browserDetails.version < 60) {\n        // Currently, all FF >= 57 will reset the remote maximum message size\n        // to the default value when a data channel is created at a later\n        // stage. :(\n        // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n        canSendMaxMessageSize =\n          browserDetails.version === 57 ? 65535 : 65536;\n      } else {\n        // FF >= 60 supports sending ~2 GiB\n        canSendMaxMessageSize = 2147483637;\n      }\n    }\n    return canSendMaxMessageSize;\n  };\n\n  const getMaxMessageSize = function(description, remoteIsFirefox) {\n    // Note: 65536 bytes is the default value from the SDP spec. Also,\n    //       every implementation we know supports receiving 65536 bytes.\n    let maxMessageSize = 65536;\n\n    // FF 57 has a slightly incorrect default remote max message size, so\n    // we need to adjust it here to avoid a failure when sending.\n    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697\n    if (browserDetails.browser === 'firefox'\n         && browserDetails.version === 57) {\n      maxMessageSize = 65535;\n    }\n\n    const match = SDPUtils.matchPrefix(description.sdp,\n      'a=max-message-size:');\n    if (match.length > 0) {\n      maxMessageSize = parseInt(match[0].substr(19), 10);\n    } else if (browserDetails.browser === 'firefox' &&\n                remoteIsFirefox !== -1) {\n      // If the maximum message size is not present in the remote SDP and\n      // both local and remote are Firefox, the remote peer can receive\n      // ~2 GiB.\n      maxMessageSize = 2147483637;\n    }\n    return maxMessageSize;\n  };\n\n  const origSetRemoteDescription =\n      window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription =\n    function setRemoteDescription() {\n      this._sctp = null;\n      // Chrome decided to not expose .sctp in plan-b mode.\n      // As usual, adapter.js has to do an 'ugly worakaround'\n      // to cover up the mess.\n      if (browserDetails.browser === 'chrome' && browserDetails.version >= 76) {\n        const {sdpSemantics} = this.getConfiguration();\n        if (sdpSemantics === 'plan-b') {\n          Object.defineProperty(this, 'sctp', {\n            get() {\n              return typeof this._sctp === 'undefined' ? null : this._sctp;\n            },\n            enumerable: true,\n            configurable: true,\n          });\n        }\n      }\n\n      if (sctpInDescription(arguments[0])) {\n        // Check if the remote is FF.\n        const isFirefox = getRemoteFirefoxVersion(arguments[0]);\n\n        // Get the maximum message size the local peer is capable of sending\n        const canSendMMS = getCanSendMaxMessageSize(isFirefox);\n\n        // Get the maximum message size of the remote peer.\n        const remoteMMS = getMaxMessageSize(arguments[0], isFirefox);\n\n        // Determine final maximum message size\n        let maxMessageSize;\n        if (canSendMMS === 0 && remoteMMS === 0) {\n          maxMessageSize = Number.POSITIVE_INFINITY;\n        } else if (canSendMMS === 0 || remoteMMS === 0) {\n          maxMessageSize = Math.max(canSendMMS, remoteMMS);\n        } else {\n          maxMessageSize = Math.min(canSendMMS, remoteMMS);\n        }\n\n        // Create a dummy RTCSctpTransport object and the 'maxMessageSize'\n        // attribute.\n        const sctp = {};\n        Object.defineProperty(sctp, 'maxMessageSize', {\n          get() {\n            return maxMessageSize;\n          }\n        });\n        this._sctp = sctp;\n      }\n\n      return origSetRemoteDescription.apply(this, arguments);\n    };\n}\n\nexport function shimSendThrowTypeError(window) {\n  if (!(window.RTCPeerConnection &&\n      'createDataChannel' in window.RTCPeerConnection.prototype)) {\n    return;\n  }\n\n  // Note: Although Firefox >= 57 has a native implementation, the maximum\n  //       message size can be reset for all data channels at a later stage.\n  //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n\n  function wrapDcSend(dc, pc) {\n    const origDataChannelSend = dc.send;\n    dc.send = function send() {\n      const data = arguments[0];\n      const length = data.length || data.size || data.byteLength;\n      if (dc.readyState === 'open' &&\n          pc.sctp && length > pc.sctp.maxMessageSize) {\n        throw new TypeError('Message too large (can send a maximum of ' +\n          pc.sctp.maxMessageSize + ' bytes)');\n      }\n      return origDataChannelSend.apply(dc, arguments);\n    };\n  }\n  const origCreateDataChannel =\n    window.RTCPeerConnection.prototype.createDataChannel;\n  window.RTCPeerConnection.prototype.createDataChannel =\n    function createDataChannel() {\n      const dataChannel = origCreateDataChannel.apply(this, arguments);\n      wrapDcSend(dataChannel, this);\n      return dataChannel;\n    };\n  utils.wrapPeerConnectionEvent(window, 'datachannel', e => {\n    wrapDcSend(e.channel, e.target);\n    return e;\n  });\n}\n\n\n/* shims RTCConnectionState by pretending it is the same as iceConnectionState.\n * See https://bugs.chromium.org/p/webrtc/issues/detail?id=6145#c12\n * for why this is a valid hack in Chrome. In Firefox it is slightly incorrect\n * since DTLS failures would be hidden. See\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1265827\n * for the Firefox tracking bug.\n */\nexport function shimConnectionState(window) {\n  if (!window.RTCPeerConnection ||\n      'connectionState' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  const proto = window.RTCPeerConnection.prototype;\n  Object.defineProperty(proto, 'connectionState', {\n    get() {\n      return {\n        completed: 'connected',\n        checking: 'connecting'\n      }[this.iceConnectionState] || this.iceConnectionState;\n    },\n    enumerable: true,\n    configurable: true\n  });\n  Object.defineProperty(proto, 'onconnectionstatechange', {\n    get() {\n      return this._onconnectionstatechange || null;\n    },\n    set(cb) {\n      if (this._onconnectionstatechange) {\n        this.removeEventListener('connectionstatechange',\n            this._onconnectionstatechange);\n        delete this._onconnectionstatechange;\n      }\n      if (cb) {\n        this.addEventListener('connectionstatechange',\n            this._onconnectionstatechange = cb);\n      }\n    },\n    enumerable: true,\n    configurable: true\n  });\n\n  ['setLocalDescription', 'setRemoteDescription'].forEach((method) => {\n    const origMethod = proto[method];\n    proto[method] = function() {\n      if (!this._connectionstatechangepoly) {\n        this._connectionstatechangepoly = e => {\n          const pc = e.target;\n          if (pc._lastConnectionState !== pc.connectionState) {\n            pc._lastConnectionState = pc.connectionState;\n            const newEvent = new Event('connectionstatechange', e);\n            pc.dispatchEvent(newEvent);\n          }\n          return e;\n        };\n        this.addEventListener('iceconnectionstatechange',\n          this._connectionstatechangepoly);\n      }\n      return origMethod.apply(this, arguments);\n    };\n  });\n}\n\nexport function removeExtmapAllowMixed(window, browserDetails) {\n  /* remove a=extmap-allow-mixed for webrtc.org < M71 */\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  if (browserDetails.browser === 'chrome' && browserDetails.version >= 71) {\n    return;\n  }\n  if (browserDetails.browser === 'safari' && browserDetails.version >= 605) {\n    return;\n  }\n  const nativeSRD = window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription =\n  function setRemoteDescription(desc) {\n    if (desc && desc.sdp && desc.sdp.indexOf('\\na=extmap-allow-mixed') !== -1) {\n      const sdp = desc.sdp.split('\\n').filter((line) => {\n        return line.trim() !== 'a=extmap-allow-mixed';\n      }).join('\\n');\n      // Safari enforces read-only-ness of RTCSessionDescription fields.\n      if (window.RTCSessionDescription &&\n          desc instanceof window.RTCSessionDescription) {\n        arguments[0] = new window.RTCSessionDescription({\n          type: desc.type,\n          sdp,\n        });\n      } else {\n        desc.sdp = sdp;\n      }\n    }\n    return nativeSRD.apply(this, arguments);\n  };\n}\n\nexport function shimAddIceCandidateNullOrEmpty(window, browserDetails) {\n  // Support for addIceCandidate(null or undefined)\n  // as well as addIceCandidate({candidate: \"\", ...})\n  // https://bugs.chromium.org/p/chromium/issues/detail?id=978582\n  // Note: must be called before other polyfills which change the signature.\n  if (!(window.RTCPeerConnection && window.RTCPeerConnection.prototype)) {\n    return;\n  }\n  const nativeAddIceCandidate =\n      window.RTCPeerConnection.prototype.addIceCandidate;\n  if (!nativeAddIceCandidate || nativeAddIceCandidate.length === 0) {\n    return;\n  }\n  window.RTCPeerConnection.prototype.addIceCandidate =\n    function addIceCandidate() {\n      if (!arguments[0]) {\n        if (arguments[1]) {\n          arguments[1].apply(null);\n        }\n        return Promise.resolve();\n      }\n      // Firefox 68+ emits and processes {candidate: \"\", ...}, ignore\n      // in older versions.\n      // Native support for ignoring exists for Chrome M77+.\n      // Safari ignores as well, exact version unknown but works in the same\n      // version that also ignores addIceCandidate(null).\n      if (((browserDetails.browser === 'chrome' && browserDetails.version < 78)\n           || (browserDetails.browser === 'firefox'\n               && browserDetails.version < 68)\n           || (browserDetails.browser === 'safari'))\n          && arguments[0] && arguments[0].candidate === '') {\n        return Promise.resolve();\n      }\n      return nativeAddIceCandidate.apply(this, arguments);\n    };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\nimport * as utils from './utils';\n\n  // Browser shims.\nimport * as chromeShim from './chrome/chrome_shim';\nimport * as edgeShim from './edge/edge_shim';\nimport * as firefoxShim from './firefox/firefox_shim';\nimport * as safariShim from './safari/safari_shim';\nimport * as commonShim from './common_shim';\n\n// Shimming starts here.\nexport function adapterFactory({window} = {}, options = {\n  shimChrome: true,\n  shimFirefox: true,\n  shimEdge: true,\n  shimSafari: true,\n}) {\n  // Utils.\n  const logging = utils.log;\n  const browserDetails = utils.detectBrowser(window);\n\n  const adapter = {\n    browserDetails,\n    commonShim,\n    extractVersion: utils.extractVersion,\n    disableLog: utils.disableLog,\n    disableWarnings: utils.disableWarnings\n  };\n\n  // Shim browser if found.\n  switch (browserDetails.browser) {\n    case 'chrome':\n      if (!chromeShim || !chromeShim.shimPeerConnection ||\n          !options.shimChrome) {\n        logging('Chrome shim is not included in this adapter release.');\n        return adapter;\n      }\n      if (browserDetails.version === null) {\n        logging('Chrome shim can not determine version, not shimming.');\n        return adapter;\n      }\n      logging('adapter.js shimming chrome.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = chromeShim;\n\n      // Must be called before shimPeerConnection.\n      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);\n\n      chromeShim.shimGetUserMedia(window, browserDetails);\n      chromeShim.shimMediaStream(window, browserDetails);\n      chromeShim.shimPeerConnection(window, browserDetails);\n      chromeShim.shimOnTrack(window, browserDetails);\n      chromeShim.shimAddTrackRemoveTrack(window, browserDetails);\n      chromeShim.shimGetSendersWithDtmf(window, browserDetails);\n      chromeShim.shimGetStats(window, browserDetails);\n      chromeShim.shimSenderReceiverGetStats(window, browserDetails);\n      chromeShim.fixNegotiationNeeded(window, browserDetails);\n\n      commonShim.shimRTCIceCandidate(window, browserDetails);\n      commonShim.shimConnectionState(window, browserDetails);\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      commonShim.removeExtmapAllowMixed(window, browserDetails);\n      break;\n    case 'firefox':\n      if (!firefoxShim || !firefoxShim.shimPeerConnection ||\n          !options.shimFirefox) {\n        logging('Firefox shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming firefox.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = firefoxShim;\n\n      // Must be called before shimPeerConnection.\n      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);\n\n      firefoxShim.shimGetUserMedia(window, browserDetails);\n      firefoxShim.shimPeerConnection(window, browserDetails);\n      firefoxShim.shimOnTrack(window, browserDetails);\n      firefoxShim.shimRemoveStream(window, browserDetails);\n      firefoxShim.shimSenderGetStats(window, browserDetails);\n      firefoxShim.shimReceiverGetStats(window, browserDetails);\n      firefoxShim.shimRTCDataChannel(window, browserDetails);\n      firefoxShim.shimAddTransceiver(window, browserDetails);\n      firefoxShim.shimGetParameters(window, browserDetails);\n      firefoxShim.shimCreateOffer(window, browserDetails);\n      firefoxShim.shimCreateAnswer(window, browserDetails);\n\n      commonShim.shimRTCIceCandidate(window, browserDetails);\n      commonShim.shimConnectionState(window, browserDetails);\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      break;\n    case 'edge':\n      if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {\n        logging('MS edge shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming edge.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = edgeShim;\n\n      edgeShim.shimGetUserMedia(window, browserDetails);\n      edgeShim.shimGetDisplayMedia(window, browserDetails);\n      edgeShim.shimPeerConnection(window, browserDetails);\n      edgeShim.shimReplaceTrack(window, browserDetails);\n\n      // the edge shim implements the full RTCIceCandidate object.\n\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      break;\n    case 'safari':\n      if (!safariShim || !options.shimSafari) {\n        logging('Safari shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming safari.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = safariShim;\n\n      // Must be called before shimCallbackAPI.\n      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);\n\n      safariShim.shimRTCIceServerUrls(window, browserDetails);\n      safariShim.shimCreateOfferLegacy(window, browserDetails);\n      safariShim.shimCallbacksAPI(window, browserDetails);\n      safariShim.shimLocalStreamsAPI(window, browserDetails);\n      safariShim.shimRemoteStreamsAPI(window, browserDetails);\n      safariShim.shimTrackEventTransceiver(window, browserDetails);\n      safariShim.shimGetUserMedia(window, browserDetails);\n      safariShim.shimAudioContext(window, browserDetails);\n\n      commonShim.shimRTCIceCandidate(window, browserDetails);\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      commonShim.removeExtmapAllowMixed(window, browserDetails);\n      break;\n    default:\n      logging('Unsupported browser!');\n      break;\n  }\n\n  return adapter;\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n\n'use strict';\n\nimport {adapterFactory} from './adapter_factory.js';\n\nconst adapter =\n  adapterFactory({window: typeof window === 'undefined' ? undefined : window});\nexport default adapter;\n","import webRTCAdapter from \"webrtc-adapter\";\n\nexport { webRTCAdapter };\n","import { webRTCAdapter } from './adapter';\n\nexport const Supports = new class {\n  readonly isIOS = ['iPad', 'iPhone', 'iPod'].includes(navigator.platform);\n  readonly supportedBrowsers = ['firefox', 'chrome', 'safari'];\n\n  readonly minFirefoxVersion = 59;\n  readonly minChromeVersion = 72;\n  readonly minSafariVersion = 605;\n\n  isWebRTCSupported(): boolean {\n    return typeof RTCPeerConnection !== 'undefined';\n  }\n\n  isBrowserSupported(): boolean {\n    const browser = this.getBrowser();\n    const version = this.getVersion();\n\n    const validBrowser = this.supportedBrowsers.includes(browser);\n\n    if (!validBrowser) return false;\n\n    if (browser === 'chrome') return version >= this.minChromeVersion;\n    if (browser === 'firefox') return version >= this.minFirefoxVersion;\n    if (browser === 'safari') return !this.isIOS && version >= this.minSafariVersion;\n\n    return false;\n  }\n\n  getBrowser(): string {\n    return webRTCAdapter.browserDetails.browser;\n  }\n\n  getVersion(): number {\n    return webRTCAdapter.browserDetails.version || 0;\n  }\n\n  isUnifiedPlanSupported(): boolean {\n    const browser = this.getBrowser();\n    const version = webRTCAdapter.browserDetails.version || 0;\n\n    if (browser === 'chrome' && version < 72) return false;\n    if (browser === 'firefox' && version >= 59) return true;\n    if (!window.RTCRtpTransceiver || !('currentDirection' in RTCRtpTransceiver.prototype)) return false;\n\n    let tempPc: RTCPeerConnection;\n    let supported = false;\n\n    try {\n      tempPc = new RTCPeerConnection();\n      tempPc.addTransceiver('audio');\n      supported = true;\n    } catch (e) { }\n    finally {\n      if (tempPc) {\n        tempPc.close();\n      }\n    }\n\n    return supported;\n  }\n\n  toString(): string {\n    return `Supports: \n    browser:${this.getBrowser()} \n    version:${this.getVersion()} \n    isIOS:${this.isIOS} \n    isWebRTCSupported:${this.isWebRTCSupported()} \n    isBrowserSupported:${this.isBrowserSupported()} \n    isUnifiedPlanSupported:${this.isUnifiedPlanSupported()}`;\n  }\n}","import * as BinaryPack from \"peerjs-js-binarypack\";\nimport { Supports } from './supports';\nimport { UtilSupportsObj } from '..';\n\nconst DEFAULT_CONFIG = {\n  iceServers: [\n    { urls: \"stun:stun.l.google.com:19302\" },\n    { urls: \"turn:0.peerjs.com:3478\", username: \"peerjs\", credential: \"peerjsp\" }\n  ],\n  sdpSemantics: \"unified-plan\"\n};\n\nexport const util = new class {\n  noop(): void { }\n\n  readonly CLOUD_HOST = \"0.peerjs.com\";\n  readonly CLOUD_PORT = 443;\n\n  // Browsers that need chunking:\n  readonly chunkedBrowsers = { Chrome: 1, chrome: 1 };\n  readonly chunkedMTU = 16300; // The original 60000 bytes setting does not work when sending data from Firefox to Chrome, which is \"cut off\" after 16384 bytes and delivered individually.\n\n  // Returns browser-agnostic default config\n  readonly defaultConfig = DEFAULT_CONFIG;\n\n  readonly browser = Supports.getBrowser();\n  readonly browserVersion = Supports.getVersion();\n\n  // Lists which features are supported\n  readonly supports = (function () {\n    const supported: UtilSupportsObj = {\n      browser: Supports.isBrowserSupported(),\n      webRTC: Supports.isWebRTCSupported(),\n      audioVideo: false,\n      data: false,\n      binaryBlob: false,\n      reliable: false,\n    };\n\n    if (!supported.webRTC) return supported;\n\n    let pc: RTCPeerConnection;\n\n    try {\n      pc = new RTCPeerConnection(DEFAULT_CONFIG);\n\n      supported.audioVideo = true;\n\n      let dc: RTCDataChannel;\n\n      try {\n        dc = pc.createDataChannel(\"_PEERJSTEST\", { ordered: true });\n        supported.data = true;\n        supported.reliable = !!dc.ordered;\n\n        // Binary test\n        try {\n          dc.binaryType = \"blob\";\n          supported.binaryBlob = !Supports.isIOS;\n        } catch (e) {\n        }\n      } catch (e) {\n      } finally {\n        if (dc) {\n          dc.close();\n        }\n      }\n    } catch (e) {\n    } finally {\n      if (pc) {\n        pc.close();\n      }\n    }\n\n    return supported;\n  })();\n\n  // Ensure alphanumeric ids\n  validateId(id: string): boolean {\n    // Allow empty ids\n    return !id || /^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/.test(id);\n  }\n\n  pack = BinaryPack.pack;\n  unpack = BinaryPack.unpack;\n\n  // Binary stuff\n\n  private _dataCount: number = 1;\n\n  chunk(blob: Blob): { __peerData: number, n: number, total: number, data: Blob }[] {\n    const chunks = [];\n    const size = blob.size;\n    const total = Math.ceil(size / util.chunkedMTU);\n\n    let index = 0;\n    let start = 0;\n\n    while (start < size) {\n      const end = Math.min(size, start + util.chunkedMTU);\n      const b = blob.slice(start, end);\n\n      const chunk = {\n        __peerData: this._dataCount,\n        n: index,\n        data: b,\n        total,\n      };\n\n      chunks.push(chunk);\n\n      start = end;\n      index++;\n    }\n\n    this._dataCount++;\n\n    return chunks;\n  }\n\n  blobToArrayBuffer(blob: Blob, cb: (arg: ArrayBuffer | null) => void): FileReader {\n    const fr = new FileReader();\n\n    fr.onload = function (evt) {\n      if (evt.target) {\n        cb(evt.target.result as ArrayBuffer);\n      }\n    };\n\n    fr.readAsArrayBuffer(blob);\n\n    return fr;\n  }\n\n  binaryStringToArrayBuffer(binary: string): ArrayBuffer | SharedArrayBuffer {\n    const byteArray = new Uint8Array(binary.length);\n\n    for (let i = 0; i < binary.length; i++) {\n      byteArray[i] = binary.charCodeAt(i) & 0xff;\n    }\n\n    return byteArray.buffer;\n  }\n\n  randomToken(): string {\n    return Math.random()\n      .toString(36)\n      .substr(2);\n  }\n\n  isSecure(): boolean {\n    return location.protocol === \"https:\";\n  }\n}\n","'use strict';\n\nvar has = Object.prototype.hasOwnProperty\n  , prefix = '~';\n\n/**\n * Constructor to create a storage for our `EE` objects.\n * An `Events` instance is a plain object whose properties are event names.\n *\n * @constructor\n * @private\n */\nfunction Events() {}\n\n//\n// We try to not inherit from `Object.prototype`. In some engines creating an\n// instance in this way is faster than calling `Object.create(null)` directly.\n// If `Object.create(null)` is not supported we prefix the event names with a\n// character to make sure that the built-in object properties are not\n// overridden or used as an attack vector.\n//\nif (Object.create) {\n  Events.prototype = Object.create(null);\n\n  //\n  // This hack is needed because the `__proto__` property is still inherited in\n  // some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.\n  //\n  if (!new Events().__proto__) prefix = false;\n}\n\n/**\n * Representation of a single event listener.\n *\n * @param {Function} fn The listener function.\n * @param {*} context The context to invoke the listener with.\n * @param {Boolean} [once=false] Specify if the listener is a one-time listener.\n * @constructor\n * @private\n */\nfunction EE(fn, context, once) {\n  this.fn = fn;\n  this.context = context;\n  this.once = once || false;\n}\n\n/**\n * Add a listener for a given event.\n *\n * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn The listener function.\n * @param {*} context The context to invoke the listener with.\n * @param {Boolean} once Specify if the listener is a one-time listener.\n * @returns {EventEmitter}\n * @private\n */\nfunction addListener(emitter, event, fn, context, once) {\n  if (typeof fn !== 'function') {\n    throw new TypeError('The listener must be a function');\n  }\n\n  var listener = new EE(fn, context || emitter, once)\n    , evt = prefix ? prefix + event : event;\n\n  if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;\n  else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);\n  else emitter._events[evt] = [emitter._events[evt], listener];\n\n  return emitter;\n}\n\n/**\n * Clear event by name.\n *\n * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.\n * @param {(String|Symbol)} evt The Event name.\n * @private\n */\nfunction clearEvent(emitter, evt) {\n  if (--emitter._eventsCount === 0) emitter._events = new Events();\n  else delete emitter._events[evt];\n}\n\n/**\n * Minimal `EventEmitter` interface that is molded against the Node.js\n * `EventEmitter` interface.\n *\n * @constructor\n * @public\n */\nfunction EventEmitter() {\n  this._events = new Events();\n  this._eventsCount = 0;\n}\n\n/**\n * Return an array listing the events for which the emitter has registered\n * listeners.\n *\n * @returns {Array}\n * @public\n */\nEventEmitter.prototype.eventNames = function eventNames() {\n  var names = []\n    , events\n    , name;\n\n  if (this._eventsCount === 0) return names;\n\n  for (name in (events = this._events)) {\n    if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);\n  }\n\n  if (Object.getOwnPropertySymbols) {\n    return names.concat(Object.getOwnPropertySymbols(events));\n  }\n\n  return names;\n};\n\n/**\n * Return the listeners registered for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @returns {Array} The registered listeners.\n * @public\n */\nEventEmitter.prototype.listeners = function listeners(event) {\n  var evt = prefix ? prefix + event : event\n    , handlers = this._events[evt];\n\n  if (!handlers) return [];\n  if (handlers.fn) return [handlers.fn];\n\n  for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {\n    ee[i] = handlers[i].fn;\n  }\n\n  return ee;\n};\n\n/**\n * Return the number of listeners listening to a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @returns {Number} The number of listeners.\n * @public\n */\nEventEmitter.prototype.listenerCount = function listenerCount(event) {\n  var evt = prefix ? prefix + event : event\n    , listeners = this._events[evt];\n\n  if (!listeners) return 0;\n  if (listeners.fn) return 1;\n  return listeners.length;\n};\n\n/**\n * Calls each of the listeners registered for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @returns {Boolean} `true` if the event had listeners, else `false`.\n * @public\n */\nEventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {\n  var evt = prefix ? prefix + event : event;\n\n  if (!this._events[evt]) return false;\n\n  var listeners = this._events[evt]\n    , len = arguments.length\n    , args\n    , i;\n\n  if (listeners.fn) {\n    if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);\n\n    switch (len) {\n      case 1: return listeners.fn.call(listeners.context), true;\n      case 2: return listeners.fn.call(listeners.context, a1), true;\n      case 3: return listeners.fn.call(listeners.context, a1, a2), true;\n      case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;\n      case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;\n      case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;\n    }\n\n    for (i = 1, args = new Array(len -1); i < len; i++) {\n      args[i - 1] = arguments[i];\n    }\n\n    listeners.fn.apply(listeners.context, args);\n  } else {\n    var length = listeners.length\n      , j;\n\n    for (i = 0; i < length; i++) {\n      if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);\n\n      switch (len) {\n        case 1: listeners[i].fn.call(listeners[i].context); break;\n        case 2: listeners[i].fn.call(listeners[i].context, a1); break;\n        case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;\n        case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;\n        default:\n          if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {\n            args[j - 1] = arguments[j];\n          }\n\n          listeners[i].fn.apply(listeners[i].context, args);\n      }\n    }\n  }\n\n  return true;\n};\n\n/**\n * Add a listener for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn The listener function.\n * @param {*} [context=this] The context to invoke the listener with.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.on = function on(event, fn, context) {\n  return addListener(this, event, fn, context, false);\n};\n\n/**\n * Add a one-time listener for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn The listener function.\n * @param {*} [context=this] The context to invoke the listener with.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.once = function once(event, fn, context) {\n  return addListener(this, event, fn, context, true);\n};\n\n/**\n * Remove the listeners of a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn Only remove the listeners that match this function.\n * @param {*} context Only remove the listeners that have this context.\n * @param {Boolean} once Only remove one-time listeners.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {\n  var evt = prefix ? prefix + event : event;\n\n  if (!this._events[evt]) return this;\n  if (!fn) {\n    clearEvent(this, evt);\n    return this;\n  }\n\n  var listeners = this._events[evt];\n\n  if (listeners.fn) {\n    if (\n      listeners.fn === fn &&\n      (!once || listeners.once) &&\n      (!context || listeners.context === context)\n    ) {\n      clearEvent(this, evt);\n    }\n  } else {\n    for (var i = 0, events = [], length = listeners.length; i < length; i++) {\n      if (\n        listeners[i].fn !== fn ||\n        (once && !listeners[i].once) ||\n        (context && listeners[i].context !== context)\n      ) {\n        events.push(listeners[i]);\n      }\n    }\n\n    //\n    // Reset the array, or remove it completely if we have no more listeners.\n    //\n    if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;\n    else clearEvent(this, evt);\n  }\n\n  return this;\n};\n\n/**\n * Remove all listeners, or those of the specified event.\n *\n * @param {(String|Symbol)} [event] The event name.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {\n  var evt;\n\n  if (event) {\n    evt = prefix ? prefix + event : event;\n    if (this._events[evt]) clearEvent(this, evt);\n  } else {\n    this._events = new Events();\n    this._eventsCount = 0;\n  }\n\n  return this;\n};\n\n//\n// Alias methods names because people roll like that.\n//\nEventEmitter.prototype.off = EventEmitter.prototype.removeListener;\nEventEmitter.prototype.addListener = EventEmitter.prototype.on;\n\n//\n// Expose the prefix.\n//\nEventEmitter.prefixed = prefix;\n\n//\n// Allow `EventEmitter` to be imported as module namespace.\n//\nEventEmitter.EventEmitter = EventEmitter;\n\n//\n// Expose the module.\n//\nif ('undefined' !== typeof module) {\n  module.exports = EventEmitter;\n}\n","const LOG_PREFIX = 'PeerJS: ';\n\n/*\nPrints log messages depending on the debug level passed in. Defaults to 0.\n0  Prints no logs.\n1  Prints only errors.\n2  Prints errors and warnings.\n3  Prints all logs.\n*/\nexport enum LogLevel {\n    Disabled,\n    Errors,\n    Warnings,\n    All\n}\n\nclass Logger {\n    private _logLevel = LogLevel.Disabled;\n\n    get logLevel(): LogLevel { return this._logLevel; }\n\n    set logLevel(logLevel: LogLevel) { this._logLevel = logLevel; }\n\n    log(...args: any[]) {\n        if (this._logLevel >= LogLevel.All) {\n            this._print(LogLevel.All, ...args);\n        }\n    }\n\n    warn(...args: any[]) {\n        if (this._logLevel >= LogLevel.Warnings) {\n            this._print(LogLevel.Warnings, ...args);\n        }\n    }\n\n    error(...args: any[]) {\n        if (this._logLevel >= LogLevel.Errors) {\n            this._print(LogLevel.Errors, ...args);\n        }\n    }\n\n    setLogFunction(fn: (logLevel: LogLevel, ..._: any[]) => void): void {\n        this._print = fn;\n    }\n\n    private _print(logLevel: LogLevel, ...rest: any[]): void {\n        const copy = [LOG_PREFIX, ...rest];\n\n        for (let i in copy) {\n            if (copy[i] instanceof Error) {\n                copy[i] = \"(\" + copy[i].name + \") \" + copy[i].message;\n\n            }\n        }\n\n        if (logLevel >= LogLevel.All) {\n            console.log(...copy);\n        } else if (logLevel >= LogLevel.Warnings) {\n            console.warn(\"WARNING\", ...copy);\n        } else if (logLevel >= LogLevel.Errors) {\n            console.error(\"ERROR\", ...copy);\n        }\n    }\n}\n\nexport default new Logger();","export enum ConnectionEventType {\n  Open = \"open\",\n  Stream = \"stream\",\n  Data = \"data\",\n  Close = \"close\",\n  Error = \"error\",\n  IceStateChanged = \"iceStateChanged\"\n}\n\nexport enum ConnectionType {\n  Data = \"data\",\n  Media = \"media\"\n}\n\nexport enum PeerEventType {\n  Open = \"open\",\n  Close = \"close\",\n  Connection = \"connection\",\n  Call = \"call\",\n  Disconnected = \"disconnected\",\n  Error = \"error\"\n}\n\nexport enum PeerErrorType {\n  BrowserIncompatible = \"browser-incompatible\",\n  Disconnected = \"disconnected\",\n  InvalidID = \"invalid-id\",\n  InvalidKey = \"invalid-key\",\n  Network = \"network\",\n  PeerUnavailable = \"peer-unavailable\",\n  SslUnavailable = \"ssl-unavailable\",\n  ServerError = \"server-error\",\n  SocketError = \"socket-error\",\n  SocketClosed = \"socket-closed\",\n  UnavailableID = \"unavailable-id\",\n  WebRTC = \"webrtc\"\n}\n\nexport enum SerializationType {\n  Binary = \"binary\",\n  BinaryUTF8 = \"binary-utf8\",\n  JSON = \"json\"\n}\n\nexport enum SocketEventType {\n  Message = \"message\",\n  Disconnected = \"disconnected\",\n  Error = \"error\",\n  Close = \"close\"\n}\n\nexport enum ServerMessageType {\n  Heartbeat = \"HEARTBEAT\",\n  Candidate = \"CANDIDATE\",\n  Offer = \"OFFER\",\n  Answer = \"ANSWER\",\n  Open = \"OPEN\", // The connection to the server is open.\n  Error = \"ERROR\", // Server error.\n  IdTaken = \"ID-TAKEN\", // The selected ID is taken.\n  InvalidKey = \"INVALID-KEY\", // The given API key cannot be found.\n  Leave = \"LEAVE\", // Another peer has closed its connection to this peer.\n  Expire = \"EXPIRE\" // The offer sent to a peer has expired without response.\n\n}","import { EventEmitter } from \"eventemitter3\";\nimport logger from \"./logger\";\nimport { SocketEventType, ServerMessageType } from \"./enums\";\n\n/**\n * An abstraction on top of WebSockets to provide fastest\n * possible connection for peers.\n */\nexport class Socket extends EventEmitter {\n  private _disconnected: boolean = true;\n  private _id?: string;\n  private _messagesQueue: Array<object> = [];\n  private _socket?: WebSocket;\n  private _wsPingTimer?: any;\n  private readonly _baseUrl: string;\n\n  constructor(\n    secure: any,\n    host: string,\n    port: number,\n    path: string,\n    key: string,\n    private readonly pingInterval: number = 5000,\n  ) {\n    super();\n\n    const wsProtocol = secure ? \"wss://\" : \"ws://\";\n\n    this._baseUrl = wsProtocol + host + \":\" + port + path + \"peerjs?key=\" + key;\n  }\n\n  start(id: string, token: string): void {\n    this._id = id;\n\n    const wsUrl = `${this._baseUrl}&id=${id}&token=${token}`;\n\n    if (!!this._socket || !this._disconnected) {\n      return;\n    }\n\n    this._socket = new WebSocket(wsUrl);\n    this._disconnected = false;\n\n    this._socket.onmessage = (event) => {\n      let data;\n\n      try {\n        data = JSON.parse(event.data);\n        logger.log(\"Server message received:\", data);\n      } catch (e) {\n        logger.log(\"Invalid server message\", event.data);\n        return;\n      }\n\n      this.emit(SocketEventType.Message, data);\n    };\n\n    this._socket.onclose = (event) => {\n      if (this._disconnected) {\n        return;\n      }\n\n      logger.log(\"Socket closed.\", event);\n\n      this._cleanup();\n      this._disconnected = true;\n\n      this.emit(SocketEventType.Disconnected);\n    };\n\n    // Take care of the queue of connections if necessary and make sure Peer knows\n    // socket is open.\n    this._socket.onopen = () => {\n      if (this._disconnected) {\n        return;\n      }\n\n      this._sendQueuedMessages();\n\n      logger.log(\"Socket open\");\n\n      this._scheduleHeartbeat();\n    };\n  }\n\n  private _scheduleHeartbeat(): void {\n    this._wsPingTimer = setTimeout(() => {\n      this._sendHeartbeat();\n    }, this.pingInterval);\n  }\n\n  private _sendHeartbeat(): void {\n    if (!this._wsOpen()) {\n      logger.log(`Cannot send heartbeat, because socket closed`);\n      return;\n    }\n\n    const message = JSON.stringify({ type: ServerMessageType.Heartbeat });\n\n    this._socket!.send(message);\n\n    this._scheduleHeartbeat();\n  }\n\n  /** Is the websocket currently open? */\n  private _wsOpen(): boolean {\n    return !!this._socket && this._socket.readyState === 1;\n  }\n\n  /** Send queued messages. */\n  private _sendQueuedMessages(): void {\n    //Create copy of queue and clear it,\n    //because send method push the message back to queue if smth will go wrong\n    const copiedQueue = [...this._messagesQueue];\n    this._messagesQueue = [];\n\n    for (const message of copiedQueue) {\n      this.send(message);\n    }\n  }\n\n  /** Exposed send for DC & Peer. */\n  send(data: any): void {\n    if (this._disconnected) {\n      return;\n    }\n\n    // If we didn't get an ID yet, we can't yet send anything so we should queue\n    // up these messages.\n    if (!this._id) {\n      this._messagesQueue.push(data);\n      return;\n    }\n\n    if (!data.type) {\n      this.emit(SocketEventType.Error, \"Invalid message\");\n      return;\n    }\n\n    if (!this._wsOpen()) {\n      return;\n    }\n\n    const message = JSON.stringify(data);\n\n    this._socket!.send(message);\n  }\n\n  close(): void {\n    if (this._disconnected) {\n      return;\n    }\n\n    this._cleanup();\n\n    this._disconnected = true;\n  }\n\n  private _cleanup(): void {\n    if (this._socket) {\n      this._socket.onopen = this._socket.onmessage = this._socket.onclose = null;\n      this._socket.close();\n      this._socket = undefined;\n    }\n\n    clearTimeout(this._wsPingTimer!);\n  }\n}\n","import { util } from \"./util\";\nimport logger from \"./logger\";\nimport { MediaConnection } from \"./mediaconnection\";\nimport { DataConnection } from \"./dataconnection\";\nimport { ConnectionType, PeerErrorType, ConnectionEventType, ServerMessageType } from \"./enums\";\nimport { BaseConnection } from \"./baseconnection\";\n\n/**\n * Manages all negotiations between Peers.\n */\nexport class Negotiator {\n  constructor(readonly connection: BaseConnection) { }\n\n  /** Returns a PeerConnection object set up correctly (for data, media). */\n  startConnection(options: any) {\n    const peerConnection = this._startPeerConnection();\n\n    // Set the connection's PC.\n    this.connection.peerConnection = peerConnection;\n\n    if (this.connection.type === ConnectionType.Media && options._stream) {\n      this._addTracksToConnection(options._stream, peerConnection);\n    }\n\n    // What do we need to do now?\n    if (options.originator) {\n      if (this.connection.type === ConnectionType.Data) {\n        const dataConnection = <DataConnection>this.connection;\n\n        const config: RTCDataChannelInit = { ordered: !!options.reliable };\n\n        const dataChannel = peerConnection.createDataChannel(\n          dataConnection.label,\n          config\n        );\n        dataConnection.initialize(dataChannel);\n      }\n\n      this._makeOffer();\n    } else {\n      this.handleSDP(\"OFFER\", options.sdp);\n    }\n  }\n\n  /** Start a PC. */\n  private _startPeerConnection(): RTCPeerConnection {\n    logger.log(\"Creating RTCPeerConnection.\");\n\n    const peerConnection = new RTCPeerConnection(this.connection.provider.options.config);\n\n    this._setupListeners(peerConnection);\n\n    return peerConnection;\n  }\n\n  /** Set up various WebRTC listeners. */\n  private _setupListeners(\n    peerConnection: RTCPeerConnection\n  ) {\n    const peerId = this.connection.peer;\n    const connectionId = this.connection.connectionId;\n    const connectionType = this.connection.type;\n    const provider = this.connection.provider;\n\n    // ICE CANDIDATES.\n    logger.log(\"Listening for ICE candidates.\");\n\n    peerConnection.onicecandidate = (evt) => {\n      if (!evt.candidate || !evt.candidate.candidate) return;\n\n      logger.log(`Received ICE candidates for ${peerId}:`, evt.candidate);\n\n      provider.socket.send({\n        type: ServerMessageType.Candidate,\n        payload: {\n          candidate: evt.candidate,\n          type: connectionType,\n          connectionId: connectionId\n        },\n        dst: peerId\n      });\n    };\n\n    peerConnection.oniceconnectionstatechange = () => {\n      switch (peerConnection.iceConnectionState) {\n        case \"failed\":\n          logger.log(\n            \"iceConnectionState is failed, closing connections to \" +\n            peerId\n          );\n          this.connection.emit(\n            ConnectionEventType.Error,\n            new Error(\"Negotiation of connection to \" + peerId + \" failed.\")\n          );\n          this.connection.close();\n          break;\n        case \"closed\":\n          logger.log(\n            \"iceConnectionState is closed, closing connections to \" +\n            peerId\n          );\n          this.connection.emit(\n            ConnectionEventType.Error,\n            new Error(\"Connection to \" + peerId + \" closed.\")\n          );\n          this.connection.close();\n          break;\n        case \"disconnected\":\n          logger.log(\n            \"iceConnectionState changed to disconnected on the connection with \" +\n            peerId\n          );\n          break;\n        case \"completed\":\n          peerConnection.onicecandidate = util.noop;\n          break;\n      }\n\n      this.connection.emit(ConnectionEventType.IceStateChanged, peerConnection.iceConnectionState);\n    };\n\n    // DATACONNECTION.\n    logger.log(\"Listening for data channel\");\n    // Fired between offer and answer, so options should already be saved\n    // in the options hash.\n    peerConnection.ondatachannel = (evt) => {\n      logger.log(\"Received data channel\");\n\n      const dataChannel = evt.channel;\n      const connection = <DataConnection>(\n        provider.getConnection(peerId, connectionId)\n      );\n\n      connection.initialize(dataChannel);\n    };\n\n    // MEDIACONNECTION.\n    logger.log(\"Listening for remote stream\");\n\n    peerConnection.ontrack = (evt) => {\n      logger.log(\"Received remote stream\");\n\n      const stream = evt.streams[0];\n      const connection = provider.getConnection(peerId, connectionId);\n\n      if (connection.type === ConnectionType.Media) {\n        const mediaConnection = <MediaConnection>connection;\n\n        this._addStreamToMediaConnection(stream, mediaConnection);\n      }\n    };\n  }\n\n  cleanup(): void {\n    logger.log(\"Cleaning up PeerConnection to \" + this.connection.peer);\n\n    const peerConnection = this.connection.peerConnection;\n\n    if (!peerConnection) {\n      return;\n    }\n\n    this.connection.peerConnection = null;\n\n    //unsubscribe from all PeerConnection's events\n    peerConnection.onicecandidate = peerConnection.oniceconnectionstatechange = peerConnection.ondatachannel = peerConnection.ontrack = () => { };\n\n    const peerConnectionNotClosed = peerConnection.signalingState !== \"closed\";\n    let dataChannelNotClosed = false;\n\n    if (this.connection.type === ConnectionType.Data) {\n      const dataConnection = <DataConnection>this.connection;\n      const dataChannel = dataConnection.dataChannel;\n\n      if (dataChannel) {\n        dataChannelNotClosed = !!dataChannel.readyState && dataChannel.readyState !== \"closed\";\n      }\n    }\n\n    if (peerConnectionNotClosed || dataChannelNotClosed) {\n      peerConnection.close();\n    }\n  }\n\n  private async _makeOffer(): Promise<void> {\n    const peerConnection = this.connection.peerConnection;\n    const provider = this.connection.provider;\n\n    try {\n      const offer = await peerConnection.createOffer(\n        this.connection.options.constraints\n      );\n\n      logger.log(\"Created offer.\");\n\n      if (this.connection.options.sdpTransform && typeof this.connection.options.sdpTransform === 'function') {\n        offer.sdp = this.connection.options.sdpTransform(offer.sdp) || offer.sdp;\n      }\n\n      try {\n        await peerConnection.setLocalDescription(offer);\n\n        logger.log(\"Set localDescription:\", offer, `for:${this.connection.peer}`);\n\n        let payload: any = {\n          sdp: offer,\n          type: this.connection.type,\n          connectionId: this.connection.connectionId,\n          metadata: this.connection.metadata,\n          browser: util.browser\n        };\n\n        if (this.connection.type === ConnectionType.Data) {\n          const dataConnection = <DataConnection>this.connection;\n\n          payload = {\n            ...payload,\n            label: dataConnection.label,\n            reliable: dataConnection.reliable,\n            serialization: dataConnection.serialization\n          };\n        }\n\n        provider.socket.send({\n          type: ServerMessageType.Offer,\n          payload,\n          dst: this.connection.peer\n        });\n      } catch (err) {\n        // TODO: investigate why _makeOffer is being called from the answer\n        if (\n          err !=\n          \"OperationError: Failed to set local offer sdp: Called in wrong state: kHaveRemoteOffer\"\n        ) {\n          provider.emitError(PeerErrorType.WebRTC, err);\n          logger.log(\"Failed to setLocalDescription, \", err);\n        }\n      }\n    } catch (err_1) {\n      provider.emitError(PeerErrorType.WebRTC, err_1);\n      logger.log(\"Failed to createOffer, \", err_1);\n    }\n  }\n\n  private async _makeAnswer(): Promise<void> {\n    const peerConnection = this.connection.peerConnection;\n    const provider = this.connection.provider;\n\n    try {\n      const answer = await peerConnection.createAnswer();\n      logger.log(\"Created answer.\");\n\n      if (this.connection.options.sdpTransform && typeof this.connection.options.sdpTransform === 'function') {\n        answer.sdp = this.connection.options.sdpTransform(answer.sdp) || answer.sdp;\n      }\n\n      try {\n        await peerConnection.setLocalDescription(answer);\n\n        logger.log(`Set localDescription:`, answer, `for:${this.connection.peer}`);\n\n        provider.socket.send({\n          type: ServerMessageType.Answer,\n          payload: {\n            sdp: answer,\n            type: this.connection.type,\n            connectionId: this.connection.connectionId,\n            browser: util.browser\n          },\n          dst: this.connection.peer\n        });\n      } catch (err) {\n        provider.emitError(PeerErrorType.WebRTC, err);\n        logger.log(\"Failed to setLocalDescription, \", err);\n      }\n    } catch (err_1) {\n      provider.emitError(PeerErrorType.WebRTC, err_1);\n      logger.log(\"Failed to create answer, \", err_1);\n    }\n  }\n\n  /** Handle an SDP. */\n  async handleSDP(\n    type: string,\n    sdp: any\n  ): Promise<void> {\n    sdp = new RTCSessionDescription(sdp);\n    const peerConnection = this.connection.peerConnection;\n    const provider = this.connection.provider;\n\n    logger.log(\"Setting remote description\", sdp);\n\n    const self = this;\n\n    try {\n      await peerConnection.setRemoteDescription(sdp);\n      logger.log(`Set remoteDescription:${type} for:${this.connection.peer}`);\n      if (type === \"OFFER\") {\n        await self._makeAnswer();\n      }\n    } catch (err) {\n      provider.emitError(PeerErrorType.WebRTC, err);\n      logger.log(\"Failed to setRemoteDescription, \", err);\n    }\n  }\n\n  /** Handle a candidate. */\n  async handleCandidate(ice: any): Promise<void> {\n    logger.log(`handleCandidate:`, ice);\n\n    const candidate = ice.candidate;\n    const sdpMLineIndex = ice.sdpMLineIndex;\n    const sdpMid = ice.sdpMid;\n    const peerConnection = this.connection.peerConnection;\n    const provider = this.connection.provider;\n\n    try {\n      await peerConnection.addIceCandidate(\n        new RTCIceCandidate({\n          sdpMid: sdpMid,\n          sdpMLineIndex: sdpMLineIndex,\n          candidate: candidate\n        })\n      );\n      logger.log(`Added ICE candidate for:${this.connection.peer}`);\n    } catch (err) {\n      provider.emitError(PeerErrorType.WebRTC, err);\n      logger.log(\"Failed to handleCandidate, \", err);\n    }\n  }\n\n  private _addTracksToConnection(\n    stream: MediaStream,\n    peerConnection: RTCPeerConnection\n  ): void {\n    logger.log(`add tracks from stream ${stream.id} to peer connection`);\n\n    if (!peerConnection.addTrack) {\n      return logger.error(\n        `Your browser does't support RTCPeerConnection#addTrack. Ignored.`\n      );\n    }\n\n    stream.getTracks().forEach(track => {\n      peerConnection.addTrack(track, stream);\n    });\n  }\n\n  private _addStreamToMediaConnection(\n    stream: MediaStream,\n    mediaConnection: MediaConnection\n  ): void {\n    logger.log(\n      `add stream ${stream.id} to media connection ${\n      mediaConnection.connectionId\n      }`\n    );\n\n    mediaConnection.addStream(stream);\n  }\n}\n","import { EventEmitter } from \"eventemitter3\";\nimport { Peer } from \"./peer\";\nimport { ServerMessage } from \"./servermessage\";\nimport { ConnectionType } from \"./enums\";\n\nexport abstract class BaseConnection extends EventEmitter {\n  protected _open = false;\n\n  readonly metadata: any;\n  connectionId: string;\n\n  peerConnection: RTCPeerConnection;\n\n  abstract get type(): ConnectionType;\n\n  get open() {\n    return this._open;\n  }\n\n  constructor(\n    readonly peer: string,\n    public provider: Peer,\n    readonly options: any\n  ) {\n    super();\n\n    this.metadata = options.metadata;\n  }\n\n  abstract close(): void;\n\n  abstract handleMessage(message: ServerMessage): void;\n}\n","import { util } from \"./util\";\nimport logger from \"./logger\";\nimport { Negotiator } from \"./negotiator\";\nimport { ConnectionType, ConnectionEventType, ServerMessageType } from \"./enums\";\nimport { Peer } from \"./peer\";\nimport { BaseConnection } from \"./baseconnection\";\nimport { ServerMessage } from \"./servermessage\";\nimport { AnswerOption } from \"..\";\n\n/**\n * Wraps the streaming interface between two Peers.\n */\nexport class MediaConnection extends BaseConnection {\n  private static readonly ID_PREFIX = \"mc_\";\n\n  private _negotiator: Negotiator;\n  private _localStream: MediaStream;\n  private _remoteStream: MediaStream;\n\n  get type() {\n    return ConnectionType.Media;\n  }\n\n  get localStream(): MediaStream { return this._localStream; }\n  get remoteStream(): MediaStream { return this._remoteStream; }\n\n  constructor(peerId: string, provider: Peer, options: any) {\n    super(peerId, provider, options);\n\n    this._localStream = this.options._stream;\n    this.connectionId =\n      this.options.connectionId ||\n      MediaConnection.ID_PREFIX + util.randomToken();\n\n    this._negotiator = new Negotiator(this);\n\n    if (this._localStream) {\n      this._negotiator.startConnection({\n        _stream: this._localStream,\n        originator: true\n      });\n    }\n  }\n\n  addStream(remoteStream) {\n    logger.log(\"Receiving stream\", remoteStream);\n\n    this._remoteStream = remoteStream;\n    super.emit(ConnectionEventType.Stream, remoteStream); // Should we call this `open`?\n  }\n\n  handleMessage(message: ServerMessage): void {\n    const type = message.type;\n    const payload = message.payload;\n\n    switch (message.type) {\n      case ServerMessageType.Answer:\n        // Forward to negotiator\n        this._negotiator.handleSDP(type, payload.sdp);\n        this._open = true;\n        break;\n      case ServerMessageType.Candidate:\n        this._negotiator.handleCandidate(payload.candidate);\n        break;\n      default:\n        logger.warn(`Unrecognized message type:${type} from peer:${this.peer}`);\n        break;\n    }\n  }\n\n  answer(stream: MediaStream, options: AnswerOption = {}): void {\n    if (this._localStream) {\n      logger.warn(\n        \"Local stream already exists on this MediaConnection. Are you answering a call twice?\"\n      );\n      return;\n    }\n\n    this._localStream = stream;\n\n    if (options && options.sdpTransform) {\n      this.options.sdpTransform = options.sdpTransform;\n    }\n\n    this._negotiator.startConnection({ ...this.options._payload, _stream: stream });\n    // Retrieve lost messages stored because PeerConnection not set up.\n    const messages = this.provider._getMessages(this.connectionId);\n\n    for (let message of messages) {\n      this.handleMessage(message);\n    }\n\n    this._open = true;\n  }\n\n  /**\n   * Exposed functionality for users.\n   */\n\n  /** Allows user to close connection. */\n  close(): void {\n    if (this._negotiator) {\n      this._negotiator.cleanup();\n      this._negotiator = null;\n    }\n\n    this._localStream = null;\n    this._remoteStream = null;\n\n    if (this.provider) {\n      this.provider._removeConnection(this);\n\n      this.provider = null;\n    }\n\n    if (this.options && this.options._stream) {\n      this.options._stream = null;\n    }\n\n    if (!this.open) {\n      return;\n    }\n\n    this._open = false;\n\n    super.emit(ConnectionEventType.Close);\n  }\n}\n","import { EventEmitter } from \"eventemitter3\";\nimport logger from \"./logger\";\n\nexport class EncodingQueue extends EventEmitter {\n  readonly fileReader: FileReader = new FileReader();\n\n  private _queue: Blob[] = [];\n  private _processing: boolean = false;\n\n  constructor() {\n    super();\n\n    this.fileReader.onload = (evt) => {\n      this._processing = false;\n\n      if (evt.target) {\n        this.emit('done', evt.target.result as ArrayBuffer);\n      }\n\n      this.doNextTask();\n    };\n\n    this.fileReader.onerror = (evt) => {\n      logger.error(`EncodingQueue error:`, evt);\n      this._processing = false;\n      this.destroy();\n      this.emit('error', evt);\n    }\n  }\n\n  get queue(): Blob[] {\n    return this._queue;\n  }\n\n  get size(): number {\n    return this.queue.length;\n  }\n\n  get processing(): boolean {\n    return this._processing;\n  }\n\n  enque(blob: Blob): void {\n    this.queue.push(blob);\n\n    if (this.processing) return;\n\n    this.doNextTask();\n  }\n\n  destroy(): void {\n    this.fileReader.abort();\n    this._queue = [];\n  }\n\n  private doNextTask(): void {\n    if (this.size === 0) return;\n    if (this.processing) return;\n\n    this._processing = true;\n\n    this.fileReader.readAsArrayBuffer(this.queue.shift());\n  }\n}","import { util } from \"./util\";\nimport logger from \"./logger\";\nimport { Negotiator } from \"./negotiator\";\nimport {\n  ConnectionType,\n  ConnectionEventType,\n  SerializationType,\n  ServerMessageType\n} from \"./enums\";\nimport { Peer } from \"./peer\";\nimport { BaseConnection } from \"./baseconnection\";\nimport { ServerMessage } from \"./servermessage\";\nimport { EncodingQueue } from './encodingQueue';\nimport { DataConnection as IDataConnection } from '../index';\n\n/**\n * Wraps a DataChannel between two Peers.\n */\nexport class DataConnection extends BaseConnection implements IDataConnection {\n  private static readonly ID_PREFIX = \"dc_\";\n  private static readonly MAX_BUFFERED_AMOUNT = 8 * 1024 * 1024;\n\n  private _negotiator: Negotiator;\n  readonly label: string;\n  readonly serialization: SerializationType;\n  readonly reliable: boolean;\n  stringify: (data: any) => string = JSON.stringify;\n  parse: (data: string) => any = JSON.parse;\n\n  get type() {\n    return ConnectionType.Data;\n  }\n\n  private _buffer: any[] = [];\n  private _bufferSize = 0;\n  private _buffering = false;\n  private _chunkedData: {\n    [id: number]: {\n      data: Blob[],\n      count: number,\n      total: number\n    }\n  } = {};\n\n  private _dc: RTCDataChannel;\n  private _encodingQueue = new EncodingQueue();\n\n  get dataChannel(): RTCDataChannel {\n    return this._dc;\n  }\n\n  get bufferSize(): number { return this._bufferSize; }\n\n  constructor(peerId: string, provider: Peer, options: any) {\n    super(peerId, provider, options);\n\n    this.connectionId =\n      this.options.connectionId || DataConnection.ID_PREFIX + util.randomToken();\n\n    this.label = this.options.label || this.connectionId;\n    this.serialization = this.options.serialization || SerializationType.Binary;\n    this.reliable = !!this.options.reliable;\n\n    this._encodingQueue.on('done', (ab: ArrayBuffer) => {\n      this._bufferedSend(ab);\n    });\n\n    this._encodingQueue.on('error', () => {\n      logger.error(`DC#${this.connectionId}: Error occured in encoding from blob to arraybuffer, close DC`);\n      this.close();\n    });\n\n    this._negotiator = new Negotiator(this);\n\n    this._negotiator.startConnection(\n      this.options._payload || {\n        originator: true\n      }\n    );\n  }\n\n  /** Called by the Negotiator when the DataChannel is ready. */\n  initialize(dc: RTCDataChannel): void {\n    this._dc = dc;\n    this._configureDataChannel();\n  }\n\n  private _configureDataChannel(): void {\n    if (!util.supports.binaryBlob || util.supports.reliable) {\n      this.dataChannel.binaryType = \"arraybuffer\";\n    }\n\n    this.dataChannel.onopen = () => {\n      logger.log(`DC#${this.connectionId} dc connection success`);\n      this._open = true;\n      this.emit(ConnectionEventType.Open);\n    };\n\n    this.dataChannel.onmessage = (e) => {\n      logger.log(`DC#${this.connectionId} dc onmessage:`, e.data);\n      this._handleDataMessage(e);\n    };\n\n    this.dataChannel.onclose = () => {\n      logger.log(`DC#${this.connectionId} dc closed for:`, this.peer);\n      this.close();\n    };\n  }\n\n  // Handles a DataChannel message.\n  private _handleDataMessage({ data }: { data: Blob | ArrayBuffer | string }): void {\n    const datatype = data.constructor;\n\n    const isBinarySerialization = this.serialization === SerializationType.Binary ||\n      this.serialization === SerializationType.BinaryUTF8;\n\n    let deserializedData: any = data;\n\n    if (isBinarySerialization) {\n      if (datatype === Blob) {\n        // Datatype should never be blob\n        util.blobToArrayBuffer(data as Blob, (ab) => {\n          const unpackedData = util.unpack(ab);\n          this.emit(ConnectionEventType.Data, unpackedData);\n        });\n        return;\n      } else if (datatype === ArrayBuffer) {\n        deserializedData = util.unpack(data as ArrayBuffer);\n      } else if (datatype === String) {\n        // String fallback for binary data for browsers that don't support binary yet\n        const ab = util.binaryStringToArrayBuffer(data as string);\n        deserializedData = util.unpack(ab);\n      }\n    } else if (this.serialization === SerializationType.JSON) {\n      deserializedData = this.parse(data as string);\n    }\n\n    // Check if we've chunked--if so, piece things back together.\n    // We're guaranteed that this isn't 0.\n    if (deserializedData.__peerData) {\n      this._handleChunk(deserializedData);\n      return;\n    }\n\n    super.emit(ConnectionEventType.Data, deserializedData);\n  }\n\n  private _handleChunk(data: { __peerData: number, n: number, total: number, data: Blob }): void {\n    const id = data.__peerData;\n    const chunkInfo = this._chunkedData[id] || {\n      data: [],\n      count: 0,\n      total: data.total\n    };\n\n    chunkInfo.data[data.n] = data.data;\n    chunkInfo.count++;\n    this._chunkedData[id] = chunkInfo;\n\n    if (chunkInfo.total === chunkInfo.count) {\n      // Clean up before making the recursive call to `_handleDataMessage`.\n      delete this._chunkedData[id];\n\n      // We've received all the chunks--time to construct the complete data.\n      const data = new Blob(chunkInfo.data);\n      this._handleDataMessage({ data });\n    }\n  }\n\n  /**\n   * Exposed functionality for users.\n   */\n\n  /** Allows user to close connection. */\n  close(): void {\n    this._buffer = [];\n    this._bufferSize = 0;\n    this._chunkedData = {};\n\n    if (this._negotiator) {\n      this._negotiator.cleanup();\n      this._negotiator = null;\n    }\n\n    if (this.provider) {\n      this.provider._removeConnection(this);\n\n      this.provider = null;\n    }\n\n    if (this.dataChannel) {\n      this.dataChannel.onopen = null;\n      this.dataChannel.onmessage = null;\n      this.dataChannel.onclose = null;\n      this._dc = null;\n    }\n\n    if (this._encodingQueue) {\n      this._encodingQueue.destroy();\n      this._encodingQueue.removeAllListeners();\n      this._encodingQueue = null;\n    }\n\n    if (!this.open) {\n      return;\n    }\n\n    this._open = false;\n\n    super.emit(ConnectionEventType.Close);\n  }\n\n  /** Allows user to send data. */\n  send(data: any, chunked?: boolean): void {\n    if (!this.open) {\n      super.emit(\n        ConnectionEventType.Error,\n        new Error(\n          \"Connection is not open. You should listen for the `open` event before sending messages.\"\n        )\n      );\n      return;\n    }\n\n    if (this.serialization === SerializationType.JSON) {\n      this._bufferedSend(this.stringify(data));\n    } else if (\n      this.serialization === SerializationType.Binary ||\n      this.serialization === SerializationType.BinaryUTF8\n    ) {\n      const blob = util.pack(data);\n\n      if (!chunked && blob.size > util.chunkedMTU) {\n        this._sendChunks(blob);\n        return;\n      }\n\n      if (!util.supports.binaryBlob) {\n        // We only do this if we really need to (e.g. blobs are not supported),\n        // because this conversion is costly.\n        this._encodingQueue.enque(blob);\n      } else {\n        this._bufferedSend(blob);\n      }\n    } else {\n      this._bufferedSend(data);\n    }\n  }\n\n  private _bufferedSend(msg: any): void {\n    if (this._buffering || !this._trySend(msg)) {\n      this._buffer.push(msg);\n      this._bufferSize = this._buffer.length;\n    }\n  }\n\n  // Returns true if the send succeeds.\n  private _trySend(msg: any): boolean {\n    if (!this.open) {\n      return false;\n    }\n\n    if (this.dataChannel.bufferedAmount > DataConnection.MAX_BUFFERED_AMOUNT) {\n      this._buffering = true;\n      setTimeout(() => {\n        this._buffering = false;\n        this._tryBuffer();\n      }, 50);\n\n      return false;\n    }\n\n    try {\n      this.dataChannel.send(msg);\n    } catch (e) {\n      logger.error(`DC#:${this.connectionId} Error when sending:`, e);\n      this._buffering = true;\n\n      this.close();\n\n      return false;\n    }\n\n    return true;\n  }\n\n  // Try to send the first message in the buffer.\n  private _tryBuffer(): void {\n    if (!this.open) {\n      return;\n    }\n\n    if (this._buffer.length === 0) {\n      return;\n    }\n\n    const msg = this._buffer[0];\n\n    if (this._trySend(msg)) {\n      this._buffer.shift();\n      this._bufferSize = this._buffer.length;\n      this._tryBuffer();\n    }\n  }\n\n  private _sendChunks(blob: Blob): void {\n    const blobs = util.chunk(blob);\n    logger.log(`DC#${this.connectionId} Try to send ${blobs.length} chunks...`);\n\n    for (let blob of blobs) {\n      this.send(blob, true);\n    }\n  }\n\n  handleMessage(message: ServerMessage): void {\n    const payload = message.payload;\n\n    switch (message.type) {\n      case ServerMessageType.Answer:\n        this._negotiator.handleSDP(message.type, payload.sdp);\n        break;\n      case ServerMessageType.Candidate:\n        this._negotiator.handleCandidate(payload.candidate);\n        break;\n      default:\n        logger.warn(\n          \"Unrecognized message type:\",\n          message.type,\n          \"from peer:\",\n          this.peer\n        );\n        break;\n    }\n  }\n}\n","import { util } from \"./util\";\nimport logger from \"./logger\";\n\nexport class API {\n  constructor(private readonly _options: any) { }\n\n  private _buildUrl(method: string): string {\n    const protocol = this._options.secure ? \"https://\" : \"http://\";\n    let url =\n      protocol +\n      this._options.host +\n      \":\" +\n      this._options.port +\n      this._options.path +\n      this._options.key +\n      \"/\" +\n      method;\n    const queryString = \"?ts=\" + new Date().getTime() + \"\" + Math.random();\n    url += queryString;\n\n    return url;\n  }\n\n  /** Get a unique ID from the server via XHR and initialize with it. */\n  async retrieveId(): Promise<string> {\n    const url = this._buildUrl(\"id\");\n\n    try {\n      const response = await fetch(url);\n\n      if (response.status !== 200) {\n        throw new Error(`Error. Status:${response.status}`);\n      }\n\n      return response.text();\n    } catch (error) {\n      logger.error(\"Error retrieving ID\", error);\n\n      let pathError = \"\";\n\n      if (\n        this._options.path === \"/\" &&\n        this._options.host !== util.CLOUD_HOST\n      ) {\n        pathError =\n          \" If you passed in a `path` to your self-hosted PeerServer, \" +\n          \"you'll also need to pass in that same path when creating a new \" +\n          \"Peer.\";\n      }\n\n      throw new Error(\"Could not get an ID from the server.\" + pathError);\n    }\n  }\n\n  /** @deprecated */\n  async listAllPeers(): Promise<any[]> {\n    const url = this._buildUrl(\"peers\");\n\n    try {\n      const response = await fetch(url);\n\n      if (response.status !== 200) {\n        if (response.status === 401) {\n          let helpfulError = \"\";\n\n          if (this._options.host === util.CLOUD_HOST) {\n            helpfulError =\n              \"It looks like you're using the cloud server. You can email \" +\n              \"team@peerjs.com to enable peer listing for your API key.\";\n          } else {\n            helpfulError =\n              \"You need to enable `allow_discovery` on your self-hosted \" +\n              \"PeerServer to use this feature.\";\n          }\n\n          throw new Error(\"It doesn't look like you have permission to list peers IDs. \" +\n            helpfulError);\n        }\n\n        throw new Error(`Error. Status:${response.status}`);\n      }\n\n      return response.json();\n    } catch (error) {\n      logger.error(\"Error retrieving list peers\", error);\n\n      throw new Error(\"Could not get list peers from the server.\" + error);\n    }\n  }\n}\n","import { EventEmitter } from \"eventemitter3\";\nimport { util } from \"./util\";\nimport logger, { LogLevel } from \"./logger\";\nimport { Socket } from \"./socket\";\nimport { MediaConnection } from \"./mediaconnection\";\nimport { DataConnection } from \"./dataconnection\";\nimport {\n  ConnectionType,\n  PeerErrorType,\n  PeerEventType,\n  SocketEventType,\n  ServerMessageType\n} from \"./enums\";\nimport { BaseConnection } from \"./baseconnection\";\nimport { ServerMessage } from \"./servermessage\";\nimport { API } from \"./api\";\nimport { PeerConnectOption, PeerJSOption } from \"..\";\n\nclass PeerOptions implements PeerJSOption {\n  debug?: LogLevel; // 1: Errors, 2: Warnings, 3: All logs\n  host?: string;\n  port?: number;\n  path?: string;\n  key?: string;\n  token?: string;\n  config?: any;\n  secure?: boolean;\n  pingInterval?: number;\n  logFunction?: (logLevel: LogLevel, ...rest: any[]) => void;\n}\n\n/**\n * A peer who can initiate connections with other peers.\n */\nexport class Peer extends EventEmitter {\n  private static readonly DEFAULT_KEY = \"peerjs\";\n\n  private readonly _options: PeerOptions;\n  private readonly _api: API;\n  private readonly _socket: Socket;\n\n  private _id: string | null = null;\n  private _lastServerId: string | null = null;\n\n  // States.\n  private _destroyed = false; // Connections have been killed\n  private _disconnected = false; // Connection to PeerServer killed but P2P connections still active\n  private _open = false; // Sockets and such are not yet open.\n  private readonly _connections: Map<string, BaseConnection[]> = new Map(); // All connections for this peer.\n  private readonly _lostMessages: Map<string, ServerMessage[]> = new Map(); // src => [list of messages]\n\n  get id() {\n    return this._id;\n  }\n\n  get options() {\n    return this._options;\n  }\n\n  get open() {\n    return this._open;\n  }\n\n  get socket() {\n    return this._socket;\n  }\n\n  /**\n   * @deprecated \n   * Return type will change from Object to Map<string,[]> \n   */\n  get connections(): Object {\n    const plainConnections = Object.create(null);\n\n    for (let [k, v] of this._connections) {\n      plainConnections[k] = v;\n    }\n\n    return plainConnections;\n  }\n\n  get destroyed() {\n    return this._destroyed;\n  }\n  get disconnected() {\n    return this._disconnected;\n  }\n\n  constructor(id?: string | PeerOptions, options?: PeerOptions) {\n    super();\n\n    let userId: string | undefined;\n\n    // Deal with overloading\n    if (id && id.constructor == Object) {\n      options = id as PeerOptions;\n    } else if (id) {\n      userId = id.toString();\n    }\n\n    // Configurize options\n    options = {\n      debug: 0, // 1: Errors, 2: Warnings, 3: All logs\n      host: util.CLOUD_HOST,\n      port: util.CLOUD_PORT,\n      path: \"/\",\n      key: Peer.DEFAULT_KEY,\n      token: util.randomToken(),\n      config: util.defaultConfig,\n      ...options\n    };\n    this._options = options;\n\n    // Detect relative URL host.\n    if (this._options.host === \"/\") {\n      this._options.host = window.location.hostname;\n    }\n\n    // Set path correctly.\n    if (this._options.path) {\n      if (this._options.path[0] !== \"/\") {\n        this._options.path = \"/\" + this._options.path;\n      }\n      if (this._options.path[this._options.path.length - 1] !== \"/\") {\n        this._options.path += \"/\";\n      }\n    }\n\n    // Set whether we use SSL to same as current host\n    if (this._options.secure === undefined && this._options.host !== util.CLOUD_HOST) {\n      this._options.secure = util.isSecure();\n    } else if (this._options.host == util.CLOUD_HOST) {\n      this._options.secure = true;\n    }\n    // Set a custom log function if present\n    if (this._options.logFunction) {\n      logger.setLogFunction(this._options.logFunction);\n    }\n\n    logger.logLevel = this._options.debug || 0;\n\n    this._api = new API(options);\n    this._socket = this._createServerConnection();\n\n    // Sanity checks\n    // Ensure WebRTC supported\n    if (!util.supports.audioVideo && !util.supports.data) {\n      this._delayedAbort(\n        PeerErrorType.BrowserIncompatible,\n        \"The current browser does not support WebRTC\"\n      );\n      return;\n    }\n\n    // Ensure alphanumeric id\n    if (!!userId && !util.validateId(userId)) {\n      this._delayedAbort(PeerErrorType.InvalidID, `ID \"${userId}\" is invalid`);\n      return;\n    }\n\n    if (userId) {\n      this._initialize(userId);\n    } else {\n      this._api.retrieveId()\n        .then(id => this._initialize(id))\n        .catch(error => this._abort(PeerErrorType.ServerError, error));\n    }\n  }\n\n  private _createServerConnection(): Socket {\n    const socket = new Socket(\n      this._options.secure,\n      this._options.host!,\n      this._options.port!,\n      this._options.path!,\n      this._options.key!,\n      this._options.pingInterval\n    );\n\n    socket.on(SocketEventType.Message, (data: ServerMessage) => {\n      this._handleMessage(data);\n    });\n\n    socket.on(SocketEventType.Error, (error: string) => {\n      this._abort(PeerErrorType.SocketError, error);\n    });\n\n    socket.on(SocketEventType.Disconnected, () => {\n      if (this.disconnected) {\n        return;\n      }\n\n      this.emitError(PeerErrorType.Network, \"Lost connection to server.\");\n      this.disconnect();\n    });\n\n    socket.on(SocketEventType.Close, () => {\n      if (this.disconnected) {\n        return;\n      }\n\n      this._abort(PeerErrorType.SocketClosed, \"Underlying socket is already closed.\");\n    });\n\n    return socket;\n  }\n\n  /** Initialize a connection with the server. */\n  private _initialize(id: string): void {\n    this._id = id;\n    this.socket.start(id, this._options.token!);\n  }\n\n  /** Handles messages from the server. */\n  private _handleMessage(message: ServerMessage): void {\n    const type = message.type;\n    const payload = message.payload;\n    const peerId = message.src;\n\n    switch (type) {\n      case ServerMessageType.Open: // The connection to the server is open.\n        this._lastServerId = this.id;\n        this._open = true;\n        this.emit(PeerEventType.Open, this.id);\n        break;\n      case ServerMessageType.Error: // Server error.\n        this._abort(PeerErrorType.ServerError, payload.msg);\n        break;\n      case ServerMessageType.IdTaken: // The selected ID is taken.\n        this._abort(PeerErrorType.UnavailableID, `ID \"${this.id}\" is taken`);\n        break;\n      case ServerMessageType.InvalidKey: // The given API key cannot be found.\n        this._abort(PeerErrorType.InvalidKey, `API KEY \"${this._options.key}\" is invalid`);\n        break;\n      case ServerMessageType.Leave: // Another peer has closed its connection to this peer.\n        logger.log(`Received leave message from ${peerId}`);\n        this._cleanupPeer(peerId);\n        this._connections.delete(peerId);\n        break;\n      case ServerMessageType.Expire: // The offer sent to a peer has expired without response.\n        this.emitError(PeerErrorType.PeerUnavailable, `Could not connect to peer ${peerId}`);\n        break;\n      case ServerMessageType.Offer: {\n        // we should consider switching this to CALL/CONNECT, but this is the least breaking option.\n        const connectionId = payload.connectionId;\n        let connection = this.getConnection(peerId, connectionId);\n\n        if (connection) {\n          connection.close();\n          logger.warn(`Offer received for existing Connection ID:${connectionId}`);\n        }\n\n        // Create a new connection.\n        if (payload.type === ConnectionType.Media) {\n          connection = new MediaConnection(peerId, this, {\n            connectionId: connectionId,\n            _payload: payload,\n            metadata: payload.metadata\n          });\n          this._addConnection(peerId, connection);\n          this.emit(PeerEventType.Call, connection);\n        } else if (payload.type === ConnectionType.Data) {\n          connection = new DataConnection(peerId, this, {\n            connectionId: connectionId,\n            _payload: payload,\n            metadata: payload.metadata,\n            label: payload.label,\n            serialization: payload.serialization,\n            reliable: payload.reliable\n          });\n          this._addConnection(peerId, connection);\n          this.emit(PeerEventType.Connection, connection);\n        } else {\n          logger.warn(`Received malformed connection type:${payload.type}`);\n          return;\n        }\n\n        // Find messages.\n        const messages = this._getMessages(connectionId);\n        for (let message of messages) {\n          connection.handleMessage(message);\n        }\n\n        break;\n      }\n      default: {\n        if (!payload) {\n          logger.warn(`You received a malformed message from ${peerId} of type ${type}`);\n          return;\n        }\n\n        const connectionId = payload.connectionId;\n        const connection = this.getConnection(peerId, connectionId);\n\n        if (connection && connection.peerConnection) {\n          // Pass it on.\n          connection.handleMessage(message);\n        } else if (connectionId) {\n          // Store for possible later use\n          this._storeMessage(connectionId, message);\n        } else {\n          logger.warn(\"You received an unrecognized message:\", message);\n        }\n        break;\n      }\n    }\n  }\n\n  /** Stores messages without a set up connection, to be claimed later. */\n  private _storeMessage(connectionId: string, message: ServerMessage): void {\n    if (!this._lostMessages.has(connectionId)) {\n      this._lostMessages.set(connectionId, []);\n    }\n\n    this._lostMessages.get(connectionId).push(message);\n  }\n\n  /** Retrieve messages from lost message store */\n  //TODO Change it to private\n  public _getMessages(connectionId: string): ServerMessage[] {\n    const messages = this._lostMessages.get(connectionId);\n\n    if (messages) {\n      this._lostMessages.delete(connectionId);\n      return messages;\n    }\n\n    return [];\n  }\n\n  /**\n   * Returns a DataConnection to the specified peer. See documentation for a\n   * complete list of options.\n   */\n  connect(peer: string, options: PeerConnectOption = {}): DataConnection {\n    if (this.disconnected) {\n      logger.warn(\n        \"You cannot connect to a new Peer because you called \" +\n        \".disconnect() on this Peer and ended your connection with the \" +\n        \"server. You can create a new Peer to reconnect, or call reconnect \" +\n        \"on this peer if you believe its ID to still be available.\"\n      );\n      this.emitError(\n        PeerErrorType.Disconnected,\n        \"Cannot connect to new Peer after disconnecting from server.\"\n      );\n      return;\n    }\n\n    const dataConnection = new DataConnection(peer, this, options);\n    this._addConnection(peer, dataConnection);\n    return dataConnection;\n  }\n\n  /**\n   * Returns a MediaConnection to the specified peer. See documentation for a\n   * complete list of options.\n   */\n  call(peer: string, stream: MediaStream, options: any = {}): MediaConnection {\n    if (this.disconnected) {\n      logger.warn(\n        \"You cannot connect to a new Peer because you called \" +\n        \".disconnect() on this Peer and ended your connection with the \" +\n        \"server. You can create a new Peer to reconnect.\"\n      );\n      this.emitError(\n        PeerErrorType.Disconnected,\n        \"Cannot connect to new Peer after disconnecting from server.\"\n      );\n      return;\n    }\n\n    if (!stream) {\n      logger.error(\n        \"To call a peer, you must provide a stream from your browser's `getUserMedia`.\"\n      );\n      return;\n    }\n\n    options._stream = stream;\n\n    const mediaConnection = new MediaConnection(peer, this, options);\n    this._addConnection(peer, mediaConnection);\n    return mediaConnection;\n  }\n\n  /** Add a data/media connection to this peer. */\n  private _addConnection(peerId: string, connection: BaseConnection): void {\n    logger.log(`add connection ${connection.type}:${connection.connectionId} to peerId:${peerId}`);\n\n    if (!this._connections.has(peerId)) {\n      this._connections.set(peerId, []);\n    }\n    this._connections.get(peerId).push(connection);\n  }\n\n  //TODO should be private\n  _removeConnection(connection: BaseConnection): void {\n    const connections = this._connections.get(connection.peer);\n\n    if (connections) {\n      const index = connections.indexOf(connection);\n\n      if (index !== -1) {\n        connections.splice(index, 1);\n      }\n    }\n\n    //remove from lost messages\n    this._lostMessages.delete(connection.connectionId);\n  }\n\n  /** Retrieve a data/media connection for this peer. */\n  getConnection(peerId: string, connectionId: string): null | BaseConnection {\n    const connections = this._connections.get(peerId);\n    if (!connections) {\n      return null;\n    }\n\n    for (let connection of connections) {\n      if (connection.connectionId === connectionId) {\n        return connection;\n      }\n    }\n\n    return null;\n  }\n\n  private _delayedAbort(type: PeerErrorType, message: string | Error): void {\n    setTimeout(() => {\n      this._abort(type, message);\n    }, 0);\n  }\n\n  /**\n   * Emits an error message and destroys the Peer.\n   * The Peer is not destroyed if it's in a disconnected state, in which case\n   * it retains its disconnected state and its existing connections.\n   */\n  private _abort(type: PeerErrorType, message: string | Error): void {\n    logger.error(\"Aborting!\");\n\n    this.emitError(type, message);\n\n    if (!this._lastServerId) {\n      this.destroy();\n    } else {\n      this.disconnect();\n    }\n  }\n\n  /** Emits a typed error message. */\n  emitError(type: PeerErrorType, err: string | Error): void {\n    logger.error(\"Error:\", err);\n\n    let error: Error & { type?: PeerErrorType };\n\n    if (typeof err === \"string\") {\n      error = new Error(err);\n    } else {\n      error = err as Error;\n    }\n\n    error.type = type;\n\n    this.emit(PeerEventType.Error, error);\n  }\n\n  /**\n   * Destroys the Peer: closes all active connections as well as the connection\n   *  to the server.\n   * Warning: The peer can no longer create or accept connections after being\n   *  destroyed.\n   */\n  destroy(): void {\n    if (this.destroyed) {\n      return;\n    }\n\n    logger.log(`Destroy peer with ID:${this.id}`);\n\n    this.disconnect();\n    this._cleanup();\n\n    this._destroyed = true;\n\n    this.emit(PeerEventType.Close);\n  }\n\n  /** Disconnects every connection on this peer. */\n  private _cleanup(): void {\n    for (let peerId of this._connections.keys()) {\n      this._cleanupPeer(peerId);\n      this._connections.delete(peerId);\n    }\n\n    this.socket.removeAllListeners();\n  }\n\n  /** Closes all connections to this peer. */\n  private _cleanupPeer(peerId: string): void {\n    const connections = this._connections.get(peerId);\n\n    if (!connections) return;\n\n    for (let connection of connections) {\n      connection.close();\n    }\n  }\n\n  /**\n   * Disconnects the Peer's connection to the PeerServer. Does not close any\n   *  active connections.\n   * Warning: The peer can no longer create or accept connections after being\n   *  disconnected. It also cannot reconnect to the server.\n   */\n  disconnect(): void {\n    if (this.disconnected) {\n      return;\n    }\n\n    const currentId = this.id;\n\n    logger.log(`Disconnect peer with ID:${currentId}`);\n\n    this._disconnected = true;\n    this._open = false;\n\n    this.socket.close();\n\n    this._lastServerId = currentId;\n    this._id = null;\n\n    this.emit(PeerEventType.Disconnected, currentId);\n  }\n\n  /** Attempts to reconnect with the same ID. */\n  reconnect(): void {\n    if (this.disconnected && !this.destroyed) {\n      logger.log(`Attempting reconnection to server with ID ${this._lastServerId}`);\n      this._disconnected = false;\n      this._initialize(this._lastServerId!);\n    } else if (this.destroyed) {\n      throw new Error(\"This peer cannot reconnect to the server. It has already been destroyed.\");\n    } else if (!this.disconnected && !this.open) {\n      // Do nothing. We're still connecting the first time.\n      logger.error(\"In a hurry? We're still trying to make the initial connection!\");\n    } else {\n      throw new Error(`Peer ${this.id} cannot reconnect because it is not disconnected from the server!`);\n    }\n  }\n\n  /**\n   * Get a list of available peer IDs. If you're running your own server, you'll\n   * want to set allow_discovery: true in the PeerServer options. If you're using\n   * the cloud server, email team@peerjs.com to get the functionality enabled for\n   * your key.\n   */\n  listAllPeers(cb = (_: any[]) => { }): void {\n    this._api.listAllPeers()\n      .then(peers => cb(peers))\n      .catch(error => this._abort(PeerErrorType.ServerError, error));\n  }\n}\n","import { util } from \"./util\";\nimport { Peer } from \"./peer\";\n\nexport const peerjs = {\n  Peer,\n  util\n};\n\nexport default Peer;\n\n(<any>window).peerjs = peerjs;\n/** @deprecated Should use peerjs namespace */\n(<any>window).Peer = Peer;\n"]}
-\ No newline at end of file
-diff --git a/node_modules/peerjs/dist/peerjs.min.js b/node_modules/peerjs/dist/peerjs.min.js
-index d6fe8fa..bb59225 100644
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-+++ b/node_modules/peerjs/dist/peerjs.min.js
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--"use strict";function e(e,i){e.navigator.mediaDevices&&"getDisplayMedia"in e.navigator.mediaDevices||e.navigator.mediaDevices&&("function"==typeof i?e.navigator.mediaDevices.getDisplayMedia=function(a){return i(a).then(function(i){var t=a.video&&a.video.width,o=a.video&&a.video.height,d=a.video&&a.video.frameRate;return a.video={mandatory:{chromeMediaSource:"desktop",chromeMediaSourceId:i,maxFrameRate:d||3}},t&&(a.video.mandatory.maxWidth=t),o&&(a.video.mandatory.maxHeight=o),e.navigator.mediaDevices.getUserMedia(a)})}:console.error("shimGetDisplayMedia: getSourceId argument is not a function"))}Object.defineProperty(exports,"__esModule",{value:!0}),exports.shimGetDisplayMedia=e;
--},{}],"uI5X":[function(require,module,exports) {
--"use strict";Object.defineProperty(exports,"__esModule",{value:!0}),exports.shimMediaStream=a,exports.shimOnTrack=c,exports.shimGetSendersWithDtmf=p,exports.shimGetStats=d,exports.shimSenderReceiverGetStats=h,exports.shimAddTrackRemoveTrackWithNative=f,exports.shimAddTrackRemoveTrack=m,exports.shimPeerConnection=u,exports.fixNegotiationNeeded=l,Object.defineProperty(exports,"shimGetUserMedia",{enumerable:!0,get:function(){return t.shimGetUserMedia}}),Object.defineProperty(exports,"shimGetDisplayMedia",{enumerable:!0,get:function(){return r.shimGetDisplayMedia}});var e=i(require("../utils.js")),t=require("./getusermedia"),r=require("./getdisplaymedia");function n(){if("function"!=typeof WeakMap)return null;var e=new WeakMap;return n=function(){return e},e}function i(e){if(e&&e.__esModule)return e;if(null===e||"object"!=typeof e&&"function"!=typeof e)return{default:e};var t=n();if(t&&t.has(e))return t.get(e);var r={},i=Object.defineProperty&&Object.getOwnPropertyDescriptor;for(var o in e)if(Object.prototype.hasOwnProperty.call(e,o)){var s=i?Object.getOwnPropertyDescriptor(e,o):null;s&&(s.get||s.set)?Object.defineProperty(r,o,s):r[o]=e[o]}return r.default=e,t&&t.set(e,r),r}function o(e,t,r){return t in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r,e}function s(e){return(s="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function a(e){e.MediaStream=e.MediaStream||e.webkitMediaStream}function c(t){if("object"!==s(t)||!t.RTCPeerConnection||"ontrack"in t.RTCPeerConnection.prototype)e.wrapPeerConnectionEvent(t,"track",function(e){return e.transceiver||Object.defineProperty(e,"transceiver",{value:{receiver:e.receiver}}),e});else{Object.defineProperty(t.RTCPeerConnection.prototype,"ontrack",{get:function(){return this._ontrack},set:function(e){this._ontrack&&this.removeEventListener("track",this._ontrack),this.addEventListener("track",this._ontrack=e)},enumerable:!0,configurable:!0});var r=t.RTCPeerConnection.prototype.setRemoteDescription;t.RTCPeerConnection.prototype.setRemoteDescription=function(){var e=this;return this._ontrackpoly||(this._ontrackpoly=function(r){r.stream.addEventListener("addtrack",function(n){var i;i=t.RTCPeerConnection.prototype.getReceivers?e.getReceivers().find(function(e){return e.track&&e.track.id===n.track.id}):{track:n.track};var o=new Event("track");o.track=n.track,o.receiver=i,o.transceiver={receiver:i},o.streams=[r.stream],e.dispatchEvent(o)}),r.stream.getTracks().forEach(function(n){var i;i=t.RTCPeerConnection.prototype.getReceivers?e.getReceivers().find(function(e){return e.track&&e.track.id===n.id}):{track:n};var o=new Event("track");o.track=n,o.receiver=i,o.transceiver={receiver:i},o.streams=[r.stream],e.dispatchEvent(o)})},this.addEventListener("addstream",this._ontrackpoly)),r.apply(this,arguments)}}}function p(e){if("object"===s(e)&&e.RTCPeerConnection&&!("getSenders"in e.RTCPeerConnection.prototype)&&"createDTMFSender"in e.RTCPeerConnection.prototype){var t=function(e,t){return{track:t,get dtmf(){return void 0===this._dtmf&&("audio"===t.kind?this._dtmf=e.createDTMFSender(t):this._dtmf=null),this._dtmf},_pc:e}};if(!e.RTCPeerConnection.prototype.getSenders){e.RTCPeerConnection.prototype.getSenders=function(){return this._senders=this._senders||[],this._senders.slice()};var r=e.RTCPeerConnection.prototype.addTrack;e.RTCPeerConnection.prototype.addTrack=function(e,n){var i=r.apply(this,arguments);return i||(i=t(this,e),this._senders.push(i)),i};var n=e.RTCPeerConnection.prototype.removeTrack;e.RTCPeerConnection.prototype.removeTrack=function(e){n.apply(this,arguments);var t=this._senders.indexOf(e);-1!==t&&this._senders.splice(t,1)}}var i=e.RTCPeerConnection.prototype.addStream;e.RTCPeerConnection.prototype.addStream=function(e){var r=this;this._senders=this._senders||[],i.apply(this,[e]),e.getTracks().forEach(function(e){r._senders.push(t(r,e))})};var o=e.RTCPeerConnection.prototype.removeStream;e.RTCPeerConnection.prototype.removeStream=function(e){var t=this;this._senders=this._senders||[],o.apply(this,[e]),e.getTracks().forEach(function(e){var r=t._senders.find(function(t){return t.track===e});r&&t._senders.splice(t._senders.indexOf(r),1)})}}else if("object"===s(e)&&e.RTCPeerConnection&&"getSenders"in e.RTCPeerConnection.prototype&&"createDTMFSender"in e.RTCPeerConnection.prototype&&e.RTCRtpSender&&!("dtmf"in e.RTCRtpSender.prototype)){var a=e.RTCPeerConnection.prototype.getSenders;e.RTCPeerConnection.prototype.getSenders=function(){var e=this,t=a.apply(this,[]);return t.forEach(function(t){return t._pc=e}),t},Object.defineProperty(e.RTCRtpSender.prototype,"dtmf",{get:function(){return void 0===this._dtmf&&("audio"===this.track.kind?this._dtmf=this._pc.createDTMFSender(this.track):this._dtmf=null),this._dtmf}})}}function d(e){if(e.RTCPeerConnection){var t=e.RTCPeerConnection.prototype.getStats;e.RTCPeerConnection.prototype.getStats=function(){var e=this,[r,n,i]=arguments;if(arguments.length>0&&"function"==typeof r)return t.apply(this,arguments);if(0===t.length&&(0===arguments.length||"function"!=typeof r))return t.apply(this,[]);var o=function(e){var t={};return e.result().forEach(function(e){var r={id:e.id,timestamp:e.timestamp,type:{localcandidate:"local-candidate",remotecandidate:"remote-candidate"}[e.type]||e.type};e.names().forEach(function(t){r[t]=e.stat(t)}),t[r.id]=r}),t},s=function(e){return new Map(Object.keys(e).map(function(t){return[t,e[t]]}))};if(arguments.length>=2){return t.apply(this,[function(e){n(s(o(e)))},r])}return new Promise(function(r,n){t.apply(e,[function(e){r(s(o(e)))},n])}).then(n,i)}}}function h(t){if("object"===s(t)&&t.RTCPeerConnection&&t.RTCRtpSender&&t.RTCRtpReceiver){if(!("getStats"in t.RTCRtpSender.prototype)){var r=t.RTCPeerConnection.prototype.getSenders;r&&(t.RTCPeerConnection.prototype.getSenders=function(){var e=this,t=r.apply(this,[]);return t.forEach(function(t){return t._pc=e}),t});var n=t.RTCPeerConnection.prototype.addTrack;n&&(t.RTCPeerConnection.prototype.addTrack=function(){var e=n.apply(this,arguments);return e._pc=this,e}),t.RTCRtpSender.prototype.getStats=function(){var t=this;return this._pc.getStats().then(function(r){return e.filterStats(r,t.track,!0)})}}if(!("getStats"in t.RTCRtpReceiver.prototype)){var i=t.RTCPeerConnection.prototype.getReceivers;i&&(t.RTCPeerConnection.prototype.getReceivers=function(){var e=this,t=i.apply(this,[]);return t.forEach(function(t){return t._pc=e}),t}),e.wrapPeerConnectionEvent(t,"track",function(e){return e.receiver._pc=e.srcElement,e}),t.RTCRtpReceiver.prototype.getStats=function(){var t=this;return this._pc.getStats().then(function(r){return e.filterStats(r,t.track,!1)})}}if("getStats"in t.RTCRtpSender.prototype&&"getStats"in t.RTCRtpReceiver.prototype){var o=t.RTCPeerConnection.prototype.getStats;t.RTCPeerConnection.prototype.getStats=function(){if(arguments.length>0&&arguments[0]instanceof t.MediaStreamTrack){var e,r,n,i=arguments[0];return this.getSenders().forEach(function(t){t.track===i&&(e?n=!0:e=t)}),this.getReceivers().forEach(function(e){return e.track===i&&(r?n=!0:r=e),e.track===i}),n||e&&r?Promise.reject(new DOMException("There are more than one sender or receiver for the track.","InvalidAccessError")):e?e.getStats():r?r.getStats():Promise.reject(new DOMException("There is no sender or receiver for the track.","InvalidAccessError"))}return o.apply(this,arguments)}}}}function f(e){e.RTCPeerConnection.prototype.getLocalStreams=function(){var e=this;return this._shimmedLocalStreams=this._shimmedLocalStreams||{},Object.keys(this._shimmedLocalStreams).map(function(t){return e._shimmedLocalStreams[t][0]})};var t=e.RTCPeerConnection.prototype.addTrack;e.RTCPeerConnection.prototype.addTrack=function(e,r){if(!r)return t.apply(this,arguments);this._shimmedLocalStreams=this._shimmedLocalStreams||{};var n=t.apply(this,arguments);return this._shimmedLocalStreams[r.id]?-1===this._shimmedLocalStreams[r.id].indexOf(n)&&this._shimmedLocalStreams[r.id].push(n):this._shimmedLocalStreams[r.id]=[r,n],n};var r=e.RTCPeerConnection.prototype.addStream;e.RTCPeerConnection.prototype.addStream=function(e){var t=this;this._shimmedLocalStreams=this._shimmedLocalStreams||{},e.getTracks().forEach(function(e){if(t.getSenders().find(function(t){return t.track===e}))throw new DOMException("Track already exists.","InvalidAccessError")});var n=this.getSenders();r.apply(this,arguments);var i=this.getSenders().filter(function(e){return-1===n.indexOf(e)});this._shimmedLocalStreams[e.id]=[e].concat(i)};var n=e.RTCPeerConnection.prototype.removeStream;e.RTCPeerConnection.prototype.removeStream=function(e){return this._shimmedLocalStreams=this._shimmedLocalStreams||{},delete this._shimmedLocalStreams[e.id],n.apply(this,arguments)};var i=e.RTCPeerConnection.prototype.removeTrack;e.RTCPeerConnection.prototype.removeTrack=function(e){var t=this;return this._shimmedLocalStreams=this._shimmedLocalStreams||{},e&&Object.keys(this._shimmedLocalStreams).forEach(function(r){var n=t._shimmedLocalStreams[r].indexOf(e);-1!==n&&t._shimmedLocalStreams[r].splice(n,1),1===t._shimmedLocalStreams[r].length&&delete t._shimmedLocalStreams[r]}),i.apply(this,arguments)}}function m(e,t){if(e.RTCPeerConnection){if(e.RTCPeerConnection.prototype.addTrack&&t.version>=65)return f(e);var r=e.RTCPeerConnection.prototype.getLocalStreams;e.RTCPeerConnection.prototype.getLocalStreams=function(){var e=this,t=r.apply(this);return this._reverseStreams=this._reverseStreams||{},t.map(function(t){return e._reverseStreams[t.id]})};var n=e.RTCPeerConnection.prototype.addStream;e.RTCPeerConnection.prototype.addStream=function(t){var r=this;if(this._streams=this._streams||{},this._reverseStreams=this._reverseStreams||{},t.getTracks().forEach(function(e){if(r.getSenders().find(function(t){return t.track===e}))throw new DOMException("Track already exists.","InvalidAccessError")}),!this._reverseStreams[t.id]){var i=new e.MediaStream(t.getTracks());this._streams[t.id]=i,this._reverseStreams[i.id]=t,t=i}n.apply(this,[t])};var i=e.RTCPeerConnection.prototype.removeStream;e.RTCPeerConnection.prototype.removeStream=function(e){this._streams=this._streams||{},this._reverseStreams=this._reverseStreams||{},i.apply(this,[this._streams[e.id]||e]),delete this._reverseStreams[this._streams[e.id]?this._streams[e.id].id:e.id],delete this._streams[e.id]},e.RTCPeerConnection.prototype.addTrack=function(t,r){var n=this;if("closed"===this.signalingState)throw new DOMException("The RTCPeerConnection's signalingState is 'closed'.","InvalidStateError");var i=[].slice.call(arguments,1);if(1!==i.length||!i[0].getTracks().find(function(e){return e===t}))throw new DOMException("The adapter.js addTrack polyfill only supports a single  stream which is associated with the specified track.","NotSupportedError");if(this.getSenders().find(function(e){return e.track===t}))throw new DOMException("Track already exists.","InvalidAccessError");this._streams=this._streams||{},this._reverseStreams=this._reverseStreams||{};var o=this._streams[r.id];if(o)o.addTrack(t),Promise.resolve().then(function(){n.dispatchEvent(new Event("negotiationneeded"))});else{var s=new e.MediaStream([t]);this._streams[r.id]=s,this._reverseStreams[s.id]=r,this.addStream(s)}return this.getSenders().find(function(e){return e.track===t})},["createOffer","createAnswer"].forEach(function(t){var r=e.RTCPeerConnection.prototype[t],n=o({},t,function(){var e=this,t=arguments;return arguments.length&&"function"==typeof arguments[0]?r.apply(this,[function(r){var n=c(e,r);t[0].apply(null,[n])},function(e){t[1]&&t[1].apply(null,e)},arguments[2]]):r.apply(this,arguments).then(function(t){return c(e,t)})});e.RTCPeerConnection.prototype[t]=n[t]});var s=e.RTCPeerConnection.prototype.setLocalDescription;e.RTCPeerConnection.prototype.setLocalDescription=function(){return arguments.length&&arguments[0].type?(arguments[0]=(e=this,t=arguments[0],r=t.sdp,Object.keys(e._reverseStreams||[]).forEach(function(t){var n=e._reverseStreams[t],i=e._streams[n.id];r=r.replace(new RegExp(n.id,"g"),i.id)}),new RTCSessionDescription({type:t.type,sdp:r})),s.apply(this,arguments)):s.apply(this,arguments);var e,t,r};var a=Object.getOwnPropertyDescriptor(e.RTCPeerConnection.prototype,"localDescription");Object.defineProperty(e.RTCPeerConnection.prototype,"localDescription",{get:function(){var e=a.get.apply(this);return""===e.type?e:c(this,e)}}),e.RTCPeerConnection.prototype.removeTrack=function(e){var t,r=this;if("closed"===this.signalingState)throw new DOMException("The RTCPeerConnection's signalingState is 'closed'.","InvalidStateError");if(!e._pc)throw new DOMException("Argument 1 of RTCPeerConnection.removeTrack does not implement interface RTCRtpSender.","TypeError");if(!(e._pc===this))throw new DOMException("Sender was not created by this connection.","InvalidAccessError");this._streams=this._streams||{},Object.keys(this._streams).forEach(function(n){r._streams[n].getTracks().find(function(t){return e.track===t})&&(t=r._streams[n])}),t&&(1===t.getTracks().length?this.removeStream(this._reverseStreams[t.id]):t.removeTrack(e.track),this.dispatchEvent(new Event("negotiationneeded")))}}function c(e,t){var r=t.sdp;return Object.keys(e._reverseStreams||[]).forEach(function(t){var n=e._reverseStreams[t],i=e._streams[n.id];r=r.replace(new RegExp(i.id,"g"),n.id)}),new RTCSessionDescription({type:t.type,sdp:r})}}function u(e,t){!e.RTCPeerConnection&&e.webkitRTCPeerConnection&&(e.RTCPeerConnection=e.webkitRTCPeerConnection),e.RTCPeerConnection&&t.version<53&&["setLocalDescription","setRemoteDescription","addIceCandidate"].forEach(function(t){var r=e.RTCPeerConnection.prototype[t],n=o({},t,function(){return arguments[0]=new("addIceCandidate"===t?e.RTCIceCandidate:e.RTCSessionDescription)(arguments[0]),r.apply(this,arguments)});e.RTCPeerConnection.prototype[t]=n[t]})}function l(t,r){e.wrapPeerConnectionEvent(t,"negotiationneeded",function(e){var t=e.target;if(!(r.version<72||t.getConfiguration&&"plan-b"===t.getConfiguration().sdpSemantics)||"stable"===t.signalingState)return e})}
--},{"../utils.js":"iSxC","./getusermedia":"s6SN","./getdisplaymedia":"VHa8"}],"NZ1C":[function(require,module,exports) {
--"use strict";Object.defineProperty(exports,"__esModule",{value:!0}),exports.filterIceServers=n;var r=t(require("../utils"));function e(){if("function"!=typeof WeakMap)return null;var r=new WeakMap;return e=function(){return r},r}function t(r){if(r&&r.__esModule)return r;if(null===r||"object"!=typeof r&&"function"!=typeof r)return{default:r};var t=e();if(t&&t.has(r))return t.get(r);var n={},u=Object.defineProperty&&Object.getOwnPropertyDescriptor;for(var i in r)if(Object.prototype.hasOwnProperty.call(r,i)){var f=u?Object.getOwnPropertyDescriptor(r,i):null;f&&(f.get||f.set)?Object.defineProperty(n,i,f):n[i]=r[i]}return n.default=r,t&&t.set(r,n),n}function n(e,t){var n=!1;return(e=JSON.parse(JSON.stringify(e))).filter(function(e){if(e&&(e.urls||e.url)){var t=e.urls||e.url;e.url&&!e.urls&&r.deprecated("RTCIceServer.url","RTCIceServer.urls");var u="string"==typeof t;return u&&(t=[t]),t=t.filter(function(r){if(0===r.indexOf("stun:"))return!1;var e=r.startsWith("turn")&&!r.startsWith("turn:[")&&r.includes("transport=udp");return e&&!n?(n=!0,!0):e&&!n}),delete e.url,e.urls=u?t[0]:t,!!t.length}})}
--},{"../utils":"iSxC"}],"YHvh":[function(require,module,exports) {
--"use strict";var r={generateIdentifier:function(){return Math.random().toString(36).substr(2,10)}};r.localCName=r.generateIdentifier(),r.splitLines=function(r){return r.trim().split("\n").map(function(r){return r.trim()})},r.splitSections=function(r){return r.split("\nm=").map(function(r,e){return(e>0?"m="+r:r).trim()+"\r\n"})},r.getDescription=function(e){var t=r.splitSections(e);return t&&t[0]},r.getMediaSections=function(e){var t=r.splitSections(e);return t.shift(),t},r.matchPrefix=function(e,t){return r.splitLines(e).filter(function(r){return 0===r.indexOf(t)})},r.parseCandidate=function(r){for(var e,t={foundation:(e=0===r.indexOf("a=candidate:")?r.substring(12).split(" "):r.substring(10).split(" "))[0],component:parseInt(e[1],10),protocol:e[2].toLowerCase(),priority:parseInt(e[3],10),ip:e[4],address:e[4],port:parseInt(e[5],10),type:e[7]},a=8;a<e.length;a+=2)switch(e[a]){case"raddr":t.relatedAddress=e[a+1];break;case"rport":t.relatedPort=parseInt(e[a+1],10);break;case"tcptype":t.tcpType=e[a+1];break;case"ufrag":t.ufrag=e[a+1],t.usernameFragment=e[a+1];break;default:t[e[a]]=e[a+1]}return t},r.writeCandidate=function(r){var e=[];e.push(r.foundation),e.push(r.component),e.push(r.protocol.toUpperCase()),e.push(r.priority),e.push(r.address||r.ip),e.push(r.port);var t=r.type;return e.push("typ"),e.push(t),"host"!==t&&r.relatedAddress&&r.relatedPort&&(e.push("raddr"),e.push(r.relatedAddress),e.push("rport"),e.push(r.relatedPort)),r.tcpType&&"tcp"===r.protocol.toLowerCase()&&(e.push("tcptype"),e.push(r.tcpType)),(r.usernameFragment||r.ufrag)&&(e.push("ufrag"),e.push(r.usernameFragment||r.ufrag)),"candidate:"+e.join(" ")},r.parseIceOptions=function(r){return r.substr(14).split(" ")},r.parseRtpMap=function(r){var e=r.substr(9).split(" "),t={payloadType:parseInt(e.shift(),10)};return e=e[0].split("/"),t.name=e[0],t.clockRate=parseInt(e[1],10),t.channels=3===e.length?parseInt(e[2],10):1,t.numChannels=t.channels,t},r.writeRtpMap=function(r){var e=r.payloadType;void 0!==r.preferredPayloadType&&(e=r.preferredPayloadType);var t=r.channels||r.numChannels||1;return"a=rtpmap:"+e+" "+r.name+"/"+r.clockRate+(1!==t?"/"+t:"")+"\r\n"},r.parseExtmap=function(r){var e=r.substr(9).split(" ");return{id:parseInt(e[0],10),direction:e[0].indexOf("/")>0?e[0].split("/")[1]:"sendrecv",uri:e[1]}},r.writeExtmap=function(r){return"a=extmap:"+(r.id||r.preferredId)+(r.direction&&"sendrecv"!==r.direction?"/"+r.direction:"")+" "+r.uri+"\r\n"},r.parseFmtp=function(r){for(var e,t={},a=r.substr(r.indexOf(" ")+1).split(";"),n=0;n<a.length;n++)t[(e=a[n].trim().split("="))[0].trim()]=e[1];return t},r.writeFmtp=function(r){var e="",t=r.payloadType;if(void 0!==r.preferredPayloadType&&(t=r.preferredPayloadType),r.parameters&&Object.keys(r.parameters).length){var a=[];Object.keys(r.parameters).forEach(function(e){r.parameters[e]?a.push(e+"="+r.parameters[e]):a.push(e)}),e+="a=fmtp:"+t+" "+a.join(";")+"\r\n"}return e},r.parseRtcpFb=function(r){var e=r.substr(r.indexOf(" ")+1).split(" ");return{type:e.shift(),parameter:e.join(" ")}},r.writeRtcpFb=function(r){var e="",t=r.payloadType;return void 0!==r.preferredPayloadType&&(t=r.preferredPayloadType),r.rtcpFeedback&&r.rtcpFeedback.length&&r.rtcpFeedback.forEach(function(r){e+="a=rtcp-fb:"+t+" "+r.type+(r.parameter&&r.parameter.length?" "+r.parameter:"")+"\r\n"}),e},r.parseSsrcMedia=function(r){var e=r.indexOf(" "),t={ssrc:parseInt(r.substr(7,e-7),10)},a=r.indexOf(":",e);return a>-1?(t.attribute=r.substr(e+1,a-e-1),t.value=r.substr(a+1)):t.attribute=r.substr(e+1),t},r.parseSsrcGroup=function(r){var e=r.substr(13).split(" ");return{semantics:e.shift(),ssrcs:e.map(function(r){return parseInt(r,10)})}},r.getMid=function(e){var t=r.matchPrefix(e,"a=mid:")[0];if(t)return t.substr(6)},r.parseFingerprint=function(r){var e=r.substr(14).split(" ");return{algorithm:e[0].toLowerCase(),value:e[1]}},r.getDtlsParameters=function(e,t){return{role:"auto",fingerprints:r.matchPrefix(e+t,"a=fingerprint:").map(r.parseFingerprint)}},r.writeDtlsParameters=function(r,e){var t="a=setup:"+e+"\r\n";return r.fingerprints.forEach(function(r){t+="a=fingerprint:"+r.algorithm+" "+r.value+"\r\n"}),t},r.parseCryptoLine=function(r){var e=r.substr(9).split(" ");return{tag:parseInt(e[0],10),cryptoSuite:e[1],keyParams:e[2],sessionParams:e.slice(3)}},r.writeCryptoLine=function(e){return"a=crypto:"+e.tag+" "+e.cryptoSuite+" "+("object"==typeof e.keyParams?r.writeCryptoKeyParams(e.keyParams):e.keyParams)+(e.sessionParams?" "+e.sessionParams.join(" "):"")+"\r\n"},r.parseCryptoKeyParams=function(r){if(0!==r.indexOf("inline:"))return null;var e=r.substr(7).split("|");return{keyMethod:"inline",keySalt:e[0],lifeTime:e[1],mkiValue:e[2]?e[2].split(":")[0]:void 0,mkiLength:e[2]?e[2].split(":")[1]:void 0}},r.writeCryptoKeyParams=function(r){return r.keyMethod+":"+r.keySalt+(r.lifeTime?"|"+r.lifeTime:"")+(r.mkiValue&&r.mkiLength?"|"+r.mkiValue+":"+r.mkiLength:"")},r.getCryptoParameters=function(e,t){return r.matchPrefix(e+t,"a=crypto:").map(r.parseCryptoLine)},r.getIceParameters=function(e,t){var a=r.matchPrefix(e+t,"a=ice-ufrag:")[0],n=r.matchPrefix(e+t,"a=ice-pwd:")[0];return a&&n?{usernameFragment:a.substr(12),password:n.substr(10)}:null},r.writeIceParameters=function(r){return"a=ice-ufrag:"+r.usernameFragment+"\r\na=ice-pwd:"+r.password+"\r\n"},r.parseRtpParameters=function(e){for(var t={codecs:[],headerExtensions:[],fecMechanisms:[],rtcp:[]},a=r.splitLines(e)[0].split(" "),n=3;n<a.length;n++){var s=a[n],i=r.matchPrefix(e,"a=rtpmap:"+s+" ")[0];if(i){var p=r.parseRtpMap(i),c=r.matchPrefix(e,"a=fmtp:"+s+" ");switch(p.parameters=c.length?r.parseFmtp(c[0]):{},p.rtcpFeedback=r.matchPrefix(e,"a=rtcp-fb:"+s+" ").map(r.parseRtcpFb),t.codecs.push(p),p.name.toUpperCase()){case"RED":case"ULPFEC":t.fecMechanisms.push(p.name.toUpperCase())}}}return r.matchPrefix(e,"a=extmap:").forEach(function(e){t.headerExtensions.push(r.parseExtmap(e))}),t},r.writeRtpDescription=function(e,t){var a="";a+="m="+e+" ",a+=t.codecs.length>0?"9":"0",a+=" UDP/TLS/RTP/SAVPF ",a+=t.codecs.map(function(r){return void 0!==r.preferredPayloadType?r.preferredPayloadType:r.payloadType}).join(" ")+"\r\n",a+="c=IN IP4 0.0.0.0\r\n",a+="a=rtcp:9 IN IP4 0.0.0.0\r\n",t.codecs.forEach(function(e){a+=r.writeRtpMap(e),a+=r.writeFmtp(e),a+=r.writeRtcpFb(e)});var n=0;return t.codecs.forEach(function(r){r.maxptime>n&&(n=r.maxptime)}),n>0&&(a+="a=maxptime:"+n+"\r\n"),a+="a=rtcp-mux\r\n",t.headerExtensions&&t.headerExtensions.forEach(function(e){a+=r.writeExtmap(e)}),a},r.parseRtpEncodingParameters=function(e){var t,a=[],n=r.parseRtpParameters(e),s=-1!==n.fecMechanisms.indexOf("RED"),i=-1!==n.fecMechanisms.indexOf("ULPFEC"),p=r.matchPrefix(e,"a=ssrc:").map(function(e){return r.parseSsrcMedia(e)}).filter(function(r){return"cname"===r.attribute}),c=p.length>0&&p[0].ssrc,o=r.matchPrefix(e,"a=ssrc-group:FID").map(function(r){return r.substr(17).split(" ").map(function(r){return parseInt(r,10)})});o.length>0&&o[0].length>1&&o[0][0]===c&&(t=o[0][1]),n.codecs.forEach(function(r){if("RTX"===r.name.toUpperCase()&&r.parameters.apt){var e={ssrc:c,codecPayloadType:parseInt(r.parameters.apt,10)};c&&t&&(e.rtx={ssrc:t}),a.push(e),s&&((e=JSON.parse(JSON.stringify(e))).fec={ssrc:c,mechanism:i?"red+ulpfec":"red"},a.push(e))}}),0===a.length&&c&&a.push({ssrc:c});var u=r.matchPrefix(e,"b=");return u.length&&(u=0===u[0].indexOf("b=TIAS:")?parseInt(u[0].substr(7),10):0===u[0].indexOf("b=AS:")?1e3*parseInt(u[0].substr(5),10)*.95-16e3:void 0,a.forEach(function(r){r.maxBitrate=u})),a},r.parseRtcpParameters=function(e){var t={},a=r.matchPrefix(e,"a=ssrc:").map(function(e){return r.parseSsrcMedia(e)}).filter(function(r){return"cname"===r.attribute})[0];a&&(t.cname=a.value,t.ssrc=a.ssrc);var n=r.matchPrefix(e,"a=rtcp-rsize");t.reducedSize=n.length>0,t.compound=0===n.length;var s=r.matchPrefix(e,"a=rtcp-mux");return t.mux=s.length>0,t},r.parseMsid=function(e){var t,a=r.matchPrefix(e,"a=msid:");if(1===a.length)return{stream:(t=a[0].substr(7).split(" "))[0],track:t[1]};var n=r.matchPrefix(e,"a=ssrc:").map(function(e){return r.parseSsrcMedia(e)}).filter(function(r){return"msid"===r.attribute});return n.length>0?{stream:(t=n[0].value.split(" "))[0],track:t[1]}:void 0},r.parseSctpDescription=function(e){var t,a=r.parseMLine(e),n=r.matchPrefix(e,"a=max-message-size:");n.length>0&&(t=parseInt(n[0].substr(19),10)),isNaN(t)&&(t=65536);var s=r.matchPrefix(e,"a=sctp-port:");if(s.length>0)return{port:parseInt(s[0].substr(12),10),protocol:a.fmt,maxMessageSize:t};if(r.matchPrefix(e,"a=sctpmap:").length>0){var i=r.matchPrefix(e,"a=sctpmap:")[0].substr(10).split(" ");return{port:parseInt(i[0],10),protocol:i[1],maxMessageSize:t}}},r.writeSctpDescription=function(r,e){var t=[];return t="DTLS/SCTP"!==r.protocol?["m="+r.kind+" 9 "+r.protocol+" "+e.protocol+"\r\n","c=IN IP4 0.0.0.0\r\n","a=sctp-port:"+e.port+"\r\n"]:["m="+r.kind+" 9 "+r.protocol+" "+e.port+"\r\n","c=IN IP4 0.0.0.0\r\n","a=sctpmap:"+e.port+" "+e.protocol+" 65535\r\n"],void 0!==e.maxMessageSize&&t.push("a=max-message-size:"+e.maxMessageSize+"\r\n"),t.join("")},r.generateSessionId=function(){return Math.random().toString().substr(2,21)},r.writeSessionBoilerplate=function(e,t,a){var n=void 0!==t?t:2;return"v=0\r\no="+(a||"thisisadapterortc")+" "+(e||r.generateSessionId())+" "+n+" IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\n"},r.writeMediaSection=function(e,t,a,n){var s=r.writeRtpDescription(e.kind,t);if(s+=r.writeIceParameters(e.iceGatherer.getLocalParameters()),s+=r.writeDtlsParameters(e.dtlsTransport.getLocalParameters(),"offer"===a?"actpass":"active"),s+="a=mid:"+e.mid+"\r\n",e.direction?s+="a="+e.direction+"\r\n":e.rtpSender&&e.rtpReceiver?s+="a=sendrecv\r\n":e.rtpSender?s+="a=sendonly\r\n":e.rtpReceiver?s+="a=recvonly\r\n":s+="a=inactive\r\n",e.rtpSender){var i="msid:"+n.id+" "+e.rtpSender.track.id+"\r\n";s+="a="+i,s+="a=ssrc:"+e.sendEncodingParameters[0].ssrc+" "+i,e.sendEncodingParameters[0].rtx&&(s+="a=ssrc:"+e.sendEncodingParameters[0].rtx.ssrc+" "+i,s+="a=ssrc-group:FID "+e.sendEncodingParameters[0].ssrc+" "+e.sendEncodingParameters[0].rtx.ssrc+"\r\n")}return s+="a=ssrc:"+e.sendEncodingParameters[0].ssrc+" cname:"+r.localCName+"\r\n",e.rtpSender&&e.sendEncodingParameters[0].rtx&&(s+="a=ssrc:"+e.sendEncodingParameters[0].rtx.ssrc+" cname:"+r.localCName+"\r\n"),s},r.getDirection=function(e,t){for(var a=r.splitLines(e),n=0;n<a.length;n++)switch(a[n]){case"a=sendrecv":case"a=sendonly":case"a=recvonly":case"a=inactive":return a[n].substr(2)}return t?r.getDirection(t):"sendrecv"},r.getKind=function(e){return r.splitLines(e)[0].split(" ")[0].substr(2)},r.isRejected=function(r){return"0"===r.split(" ",2)[1]},r.parseMLine=function(e){var t=r.splitLines(e)[0].substr(2).split(" ");return{kind:t[0],port:parseInt(t[1],10),protocol:t[2],fmt:t.slice(3).join(" ")}},r.parseOLine=function(e){var t=r.matchPrefix(e,"o=")[0].substr(2).split(" ");return{username:t[0],sessionId:t[1],sessionVersion:parseInt(t[2],10),netType:t[3],addressType:t[4],address:t[5]}},r.isValidSDP=function(e){if("string"!=typeof e||0===e.length)return!1;for(var t=r.splitLines(e),a=0;a<t.length;a++)if(t[a].length<2||"="!==t[a].charAt(1))return!1;return!0},"object"==typeof module&&(module.exports=r);
--},{}],"NJ2u":[function(require,module,exports) {
--"use strict";var e=require("sdp");function t(e){return{inboundrtp:"inbound-rtp",outboundrtp:"outbound-rtp",candidatepair:"candidate-pair",localcandidate:"local-candidate",remotecandidate:"remote-candidate"}[e.type]||e.type}function r(t,r,n,a,i){var s=e.writeRtpDescription(t.kind,r);if(s+=e.writeIceParameters(t.iceGatherer.getLocalParameters()),s+=e.writeDtlsParameters(t.dtlsTransport.getLocalParameters(),"offer"===n?"actpass":i||"active"),s+="a=mid:"+t.mid+"\r\n",t.rtpSender&&t.rtpReceiver?s+="a=sendrecv\r\n":t.rtpSender?s+="a=sendonly\r\n":t.rtpReceiver?s+="a=recvonly\r\n":s+="a=inactive\r\n",t.rtpSender){var o=t.rtpSender._initialTrackId||t.rtpSender.track.id;t.rtpSender._initialTrackId=o;var c="msid:"+(a?a.id:"-")+" "+o+"\r\n";s+="a="+c,s+="a=ssrc:"+t.sendEncodingParameters[0].ssrc+" "+c,t.sendEncodingParameters[0].rtx&&(s+="a=ssrc:"+t.sendEncodingParameters[0].rtx.ssrc+" "+c,s+="a=ssrc-group:FID "+t.sendEncodingParameters[0].ssrc+" "+t.sendEncodingParameters[0].rtx.ssrc+"\r\n")}return s+="a=ssrc:"+t.sendEncodingParameters[0].ssrc+" cname:"+e.localCName+"\r\n",t.rtpSender&&t.sendEncodingParameters[0].rtx&&(s+="a=ssrc:"+t.sendEncodingParameters[0].rtx.ssrc+" cname:"+e.localCName+"\r\n"),s}function n(e,t){var r=!1;return(e=JSON.parse(JSON.stringify(e))).filter(function(e){if(e&&(e.urls||e.url)){var n=e.urls||e.url;e.url&&!e.urls&&console.warn("RTCIceServer.url is deprecated! Use urls instead.");var a="string"==typeof n;return a&&(n=[n]),n=n.filter(function(e){return 0===e.indexOf("turn:")&&-1!==e.indexOf("transport=udp")&&-1===e.indexOf("turn:[")&&!r?(r=!0,!0):0===e.indexOf("stun:")&&t>=14393&&-1===e.indexOf("?transport=udp")}),delete e.url,e.urls=a?n[0]:n,!!n.length}})}function a(e,t){var r={codecs:[],headerExtensions:[],fecMechanisms:[]},n=function(e,t){e=parseInt(e,10);for(var r=0;r<t.length;r++)if(t[r].payloadType===e||t[r].preferredPayloadType===e)return t[r]},a=function(e,t,r,a){var i=n(e.parameters.apt,r),s=n(t.parameters.apt,a);return i&&s&&i.name.toLowerCase()===s.name.toLowerCase()};return e.codecs.forEach(function(n){for(var i=0;i<t.codecs.length;i++){var s=t.codecs[i];if(n.name.toLowerCase()===s.name.toLowerCase()&&n.clockRate===s.clockRate){if("rtx"===n.name.toLowerCase()&&n.parameters&&s.parameters.apt&&!a(n,s,e.codecs,t.codecs))continue;(s=JSON.parse(JSON.stringify(s))).numChannels=Math.min(n.numChannels,s.numChannels),r.codecs.push(s),s.rtcpFeedback=s.rtcpFeedback.filter(function(e){for(var t=0;t<n.rtcpFeedback.length;t++)if(n.rtcpFeedback[t].type===e.type&&n.rtcpFeedback[t].parameter===e.parameter)return!0;return!1});break}}}),e.headerExtensions.forEach(function(e){for(var n=0;n<t.headerExtensions.length;n++){var a=t.headerExtensions[n];if(e.uri===a.uri){r.headerExtensions.push(a);break}}}),r}function i(e,t,r){return-1!=={offer:{setLocalDescription:["stable","have-local-offer"],setRemoteDescription:["stable","have-remote-offer"]},answer:{setLocalDescription:["have-remote-offer","have-local-pranswer"],setRemoteDescription:["have-local-offer","have-remote-pranswer"]}}[t][e].indexOf(r)}function s(e,t){var r=e.getRemoteCandidates().find(function(e){return t.foundation===e.foundation&&t.ip===e.ip&&t.port===e.port&&t.priority===e.priority&&t.protocol===e.protocol&&t.type===e.type});return r||e.addRemoteCandidate(t),!r}function o(e,t){var r=new Error(t);return r.name=e,r.code={NotSupportedError:9,InvalidStateError:11,InvalidAccessError:15,TypeError:void 0,OperationError:void 0}[e],r}module.exports=function(c,d){function p(e,t){t.addTrack(e),t.dispatchEvent(new c.MediaStreamTrackEvent("addtrack",{track:e}))}function l(e,t,r,n){var a=new Event("track");a.track=t,a.receiver=r,a.transceiver={receiver:r},a.streams=n,c.setTimeout(function(){e._dispatchEvent("track",a)})}var f=function(t){var r=this,a=document.createDocumentFragment();if(["addEventListener","removeEventListener","dispatchEvent"].forEach(function(e){r[e]=a[e].bind(a)}),this.canTrickleIceCandidates=null,this.needNegotiation=!1,this.localStreams=[],this.remoteStreams=[],this._localDescription=null,this._remoteDescription=null,this.signalingState="stable",this.iceConnectionState="new",this.connectionState="new",this.iceGatheringState="new",t=JSON.parse(JSON.stringify(t||{})),this.usingBundle="max-bundle"===t.bundlePolicy,"negotiate"===t.rtcpMuxPolicy)throw o("NotSupportedError","rtcpMuxPolicy 'negotiate' is not supported");switch(t.rtcpMuxPolicy||(t.rtcpMuxPolicy="require"),t.iceTransportPolicy){case"all":case"relay":break;default:t.iceTransportPolicy="all"}switch(t.bundlePolicy){case"balanced":case"max-compat":case"max-bundle":break;default:t.bundlePolicy="balanced"}if(t.iceServers=n(t.iceServers||[],d),this._iceGatherers=[],t.iceCandidatePoolSize)for(var i=t.iceCandidatePoolSize;i>0;i--)this._iceGatherers.push(new c.RTCIceGatherer({iceServers:t.iceServers,gatherPolicy:t.iceTransportPolicy}));else t.iceCandidatePoolSize=0;this._config=t,this.transceivers=[],this._sdpSessionId=e.generateSessionId(),this._sdpSessionVersion=0,this._dtlsRole=void 0,this._isClosed=!1};Object.defineProperty(f.prototype,"localDescription",{configurable:!0,get:function(){return this._localDescription}}),Object.defineProperty(f.prototype,"remoteDescription",{configurable:!0,get:function(){return this._remoteDescription}}),f.prototype.onicecandidate=null,f.prototype.onaddstream=null,f.prototype.ontrack=null,f.prototype.onremovestream=null,f.prototype.onsignalingstatechange=null,f.prototype.oniceconnectionstatechange=null,f.prototype.onconnectionstatechange=null,f.prototype.onicegatheringstatechange=null,f.prototype.onnegotiationneeded=null,f.prototype.ondatachannel=null,f.prototype._dispatchEvent=function(e,t){this._isClosed||(this.dispatchEvent(t),"function"==typeof this["on"+e]&&this["on"+e](t))},f.prototype._emitGatheringStateChange=function(){var e=new Event("icegatheringstatechange");this._dispatchEvent("icegatheringstatechange",e)},f.prototype.getConfiguration=function(){return this._config},f.prototype.getLocalStreams=function(){return this.localStreams},f.prototype.getRemoteStreams=function(){return this.remoteStreams},f.prototype._createTransceiver=function(e,t){var r=this.transceivers.length>0,n={track:null,iceGatherer:null,iceTransport:null,dtlsTransport:null,localCapabilities:null,remoteCapabilities:null,rtpSender:null,rtpReceiver:null,kind:e,mid:null,sendEncodingParameters:null,recvEncodingParameters:null,stream:null,associatedRemoteMediaStreams:[],wantReceive:!0};if(this.usingBundle&&r)n.iceTransport=this.transceivers[0].iceTransport,n.dtlsTransport=this.transceivers[0].dtlsTransport;else{var a=this._createIceAndDtlsTransports();n.iceTransport=a.iceTransport,n.dtlsTransport=a.dtlsTransport}return t||this.transceivers.push(n),n},f.prototype.addTrack=function(e,t){if(this._isClosed)throw o("InvalidStateError","Attempted to call addTrack on a closed peerconnection.");var r;if(this.transceivers.find(function(t){return t.track===e}))throw o("InvalidAccessError","Track already exists.");for(var n=0;n<this.transceivers.length;n++)this.transceivers[n].track||this.transceivers[n].kind!==e.kind||(r=this.transceivers[n]);return r||(r=this._createTransceiver(e.kind)),this._maybeFireNegotiationNeeded(),-1===this.localStreams.indexOf(t)&&this.localStreams.push(t),r.track=e,r.stream=t,r.rtpSender=new c.RTCRtpSender(e,r.dtlsTransport),r.rtpSender},f.prototype.addStream=function(e){var t=this;if(d>=15025)e.getTracks().forEach(function(r){t.addTrack(r,e)});else{var r=e.clone();e.getTracks().forEach(function(e,t){var n=r.getTracks()[t];e.addEventListener("enabled",function(e){n.enabled=e.enabled})}),r.getTracks().forEach(function(e){t.addTrack(e,r)})}},f.prototype.removeTrack=function(e){if(this._isClosed)throw o("InvalidStateError","Attempted to call removeTrack on a closed peerconnection.");if(!(e instanceof c.RTCRtpSender))throw new TypeError("Argument 1 of RTCPeerConnection.removeTrack does not implement interface RTCRtpSender.");var t=this.transceivers.find(function(t){return t.rtpSender===e});if(!t)throw o("InvalidAccessError","Sender was not created by this connection.");var r=t.stream;t.rtpSender.stop(),t.rtpSender=null,t.track=null,t.stream=null,-1===this.transceivers.map(function(e){return e.stream}).indexOf(r)&&this.localStreams.indexOf(r)>-1&&this.localStreams.splice(this.localStreams.indexOf(r),1),this._maybeFireNegotiationNeeded()},f.prototype.removeStream=function(e){var t=this;e.getTracks().forEach(function(e){var r=t.getSenders().find(function(t){return t.track===e});r&&t.removeTrack(r)})},f.prototype.getSenders=function(){return this.transceivers.filter(function(e){return!!e.rtpSender}).map(function(e){return e.rtpSender})},f.prototype.getReceivers=function(){return this.transceivers.filter(function(e){return!!e.rtpReceiver}).map(function(e){return e.rtpReceiver})},f.prototype._createIceGatherer=function(e,t){var r=this;if(t&&e>0)return this.transceivers[0].iceGatherer;if(this._iceGatherers.length)return this._iceGatherers.shift();var n=new c.RTCIceGatherer({iceServers:this._config.iceServers,gatherPolicy:this._config.iceTransportPolicy});return Object.defineProperty(n,"state",{value:"new",writable:!0}),this.transceivers[e].bufferedCandidateEvents=[],this.transceivers[e].bufferCandidates=function(t){var a=!t.candidate||0===Object.keys(t.candidate).length;n.state=a?"completed":"gathering",null!==r.transceivers[e].bufferedCandidateEvents&&r.transceivers[e].bufferedCandidateEvents.push(t)},n.addEventListener("localcandidate",this.transceivers[e].bufferCandidates),n},f.prototype._gather=function(t,r){var n=this,a=this.transceivers[r].iceGatherer;if(!a.onlocalcandidate){var i=this.transceivers[r].bufferedCandidateEvents;this.transceivers[r].bufferedCandidateEvents=null,a.removeEventListener("localcandidate",this.transceivers[r].bufferCandidates),a.onlocalcandidate=function(i){if(!(n.usingBundle&&r>0)){var s=new Event("icecandidate");s.candidate={sdpMid:t,sdpMLineIndex:r};var o=i.candidate,c=!o||0===Object.keys(o).length;if(c)"new"!==a.state&&"gathering"!==a.state||(a.state="completed");else{"new"===a.state&&(a.state="gathering"),o.component=1,o.ufrag=a.getLocalParameters().usernameFragment;var d=e.writeCandidate(o);s.candidate=Object.assign(s.candidate,e.parseCandidate(d)),s.candidate.candidate=d,s.candidate.toJSON=function(){return{candidate:s.candidate.candidate,sdpMid:s.candidate.sdpMid,sdpMLineIndex:s.candidate.sdpMLineIndex,usernameFragment:s.candidate.usernameFragment}}}var p=e.getMediaSections(n._localDescription.sdp);p[s.candidate.sdpMLineIndex]+=c?"a=end-of-candidates\r\n":"a="+s.candidate.candidate+"\r\n",n._localDescription.sdp=e.getDescription(n._localDescription.sdp)+p.join("");var l=n.transceivers.every(function(e){return e.iceGatherer&&"completed"===e.iceGatherer.state});"gathering"!==n.iceGatheringState&&(n.iceGatheringState="gathering",n._emitGatheringStateChange()),c||n._dispatchEvent("icecandidate",s),l&&(n._dispatchEvent("icecandidate",new Event("icecandidate")),n.iceGatheringState="complete",n._emitGatheringStateChange())}},c.setTimeout(function(){i.forEach(function(e){a.onlocalcandidate(e)})},0)}},f.prototype._createIceAndDtlsTransports=function(){var e=this,t=new c.RTCIceTransport(null);t.onicestatechange=function(){e._updateIceConnectionState(),e._updateConnectionState()};var r=new c.RTCDtlsTransport(t);return r.ondtlsstatechange=function(){e._updateConnectionState()},r.onerror=function(){Object.defineProperty(r,"state",{value:"failed",writable:!0}),e._updateConnectionState()},{iceTransport:t,dtlsTransport:r}},f.prototype._disposeIceAndDtlsTransports=function(e){var t=this.transceivers[e].iceGatherer;t&&(delete t.onlocalcandidate,delete this.transceivers[e].iceGatherer);var r=this.transceivers[e].iceTransport;r&&(delete r.onicestatechange,delete this.transceivers[e].iceTransport);var n=this.transceivers[e].dtlsTransport;n&&(delete n.ondtlsstatechange,delete n.onerror,delete this.transceivers[e].dtlsTransport)},f.prototype._transceive=function(t,r,n){var i=a(t.localCapabilities,t.remoteCapabilities);r&&t.rtpSender&&(i.encodings=t.sendEncodingParameters,i.rtcp={cname:e.localCName,compound:t.rtcpParameters.compound},t.recvEncodingParameters.length&&(i.rtcp.ssrc=t.recvEncodingParameters[0].ssrc),t.rtpSender.send(i)),n&&t.rtpReceiver&&i.codecs.length>0&&("video"===t.kind&&t.recvEncodingParameters&&d<15019&&t.recvEncodingParameters.forEach(function(e){delete e.rtx}),t.recvEncodingParameters.length?i.encodings=t.recvEncodingParameters:i.encodings=[{}],i.rtcp={compound:t.rtcpParameters.compound},t.rtcpParameters.cname&&(i.rtcp.cname=t.rtcpParameters.cname),t.sendEncodingParameters.length&&(i.rtcp.ssrc=t.sendEncodingParameters[0].ssrc),t.rtpReceiver.receive(i))},f.prototype.setLocalDescription=function(t){var r,n,s=this;if(-1===["offer","answer"].indexOf(t.type))return Promise.reject(o("TypeError",'Unsupported type "'+t.type+'"'));if(!i("setLocalDescription",t.type,s.signalingState)||s._isClosed)return Promise.reject(o("InvalidStateError","Can not set local "+t.type+" in state "+s.signalingState));if("offer"===t.type)r=e.splitSections(t.sdp),n=r.shift(),r.forEach(function(t,r){var n=e.parseRtpParameters(t);s.transceivers[r].localCapabilities=n}),s.transceivers.forEach(function(e,t){s._gather(e.mid,t)});else if("answer"===t.type){r=e.splitSections(s._remoteDescription.sdp),n=r.shift();var c=e.matchPrefix(n,"a=ice-lite").length>0;r.forEach(function(t,r){var i=s.transceivers[r],o=i.iceGatherer,d=i.iceTransport,p=i.dtlsTransport,l=i.localCapabilities,f=i.remoteCapabilities;if(!(e.isRejected(t)&&0===e.matchPrefix(t,"a=bundle-only").length)&&!i.rejected){var u=e.getIceParameters(t,n),v=e.getDtlsParameters(t,n);c&&(v.role="server"),s.usingBundle&&0!==r||(s._gather(i.mid,r),"new"===d.state&&d.start(o,u,c?"controlling":"controlled"),"new"===p.state&&p.start(v));var h=a(l,f);s._transceive(i,h.codecs.length>0,!1)}})}return s._localDescription={type:t.type,sdp:t.sdp},"offer"===t.type?s._updateSignalingState("have-local-offer"):s._updateSignalingState("stable"),Promise.resolve()},f.prototype.setRemoteDescription=function(t){var r=this;if(-1===["offer","answer"].indexOf(t.type))return Promise.reject(o("TypeError",'Unsupported type "'+t.type+'"'));if(!i("setRemoteDescription",t.type,r.signalingState)||r._isClosed)return Promise.reject(o("InvalidStateError","Can not set remote "+t.type+" in state "+r.signalingState));var n={};r.remoteStreams.forEach(function(e){n[e.id]=e});var f=[],u=e.splitSections(t.sdp),v=u.shift(),h=e.matchPrefix(v,"a=ice-lite").length>0,m=e.matchPrefix(v,"a=group:BUNDLE ").length>0;r.usingBundle=m;var g=e.matchPrefix(v,"a=ice-options:")[0];return r.canTrickleIceCandidates=!!g&&g.substr(14).split(" ").indexOf("trickle")>=0,u.forEach(function(i,o){var l=e.splitLines(i),u=e.getKind(i),g=e.isRejected(i)&&0===e.matchPrefix(i,"a=bundle-only").length,y=l[0].substr(2).split(" ")[2],S=e.getDirection(i,v),T=e.parseMsid(i),E=e.getMid(i)||e.generateIdentifier();if(g||"application"===u&&("DTLS/SCTP"===y||"UDP/DTLS/SCTP"===y))r.transceivers[o]={mid:E,kind:u,protocol:y,rejected:!0};else{var C,P,w,R,_,k,b,x,D;!g&&r.transceivers[o]&&r.transceivers[o].rejected&&(r.transceivers[o]=r._createTransceiver(u,!0));var I,L,M=e.parseRtpParameters(i);g||(I=e.getIceParameters(i,v),(L=e.getDtlsParameters(i,v)).role="client"),b=e.parseRtpEncodingParameters(i);var O=e.parseRtcpParameters(i),G=e.matchPrefix(i,"a=end-of-candidates",v).length>0,j=e.matchPrefix(i,"a=candidate:").map(function(t){return e.parseCandidate(t)}).filter(function(e){return 1===e.component});if(("offer"===t.type||"answer"===t.type)&&!g&&m&&o>0&&r.transceivers[o]&&(r._disposeIceAndDtlsTransports(o),r.transceivers[o].iceGatherer=r.transceivers[0].iceGatherer,r.transceivers[o].iceTransport=r.transceivers[0].iceTransport,r.transceivers[o].dtlsTransport=r.transceivers[0].dtlsTransport,r.transceivers[o].rtpSender&&r.transceivers[o].rtpSender.setTransport(r.transceivers[0].dtlsTransport),r.transceivers[o].rtpReceiver&&r.transceivers[o].rtpReceiver.setTransport(r.transceivers[0].dtlsTransport)),"offer"!==t.type||g){if("answer"===t.type&&!g){P=(C=r.transceivers[o]).iceGatherer,w=C.iceTransport,R=C.dtlsTransport,_=C.rtpReceiver,k=C.sendEncodingParameters,x=C.localCapabilities,r.transceivers[o].recvEncodingParameters=b,r.transceivers[o].remoteCapabilities=M,r.transceivers[o].rtcpParameters=O,j.length&&"new"===w.state&&(!h&&!G||m&&0!==o?j.forEach(function(e){s(C.iceTransport,e)}):w.setRemoteCandidates(j)),m&&0!==o||("new"===w.state&&w.start(P,I,"controlling"),"new"===R.state&&R.start(L)),!a(C.localCapabilities,C.remoteCapabilities).codecs.filter(function(e){return"rtx"===e.name.toLowerCase()}).length&&C.sendEncodingParameters[0].rtx&&delete C.sendEncodingParameters[0].rtx,r._transceive(C,"sendrecv"===S||"recvonly"===S,"sendrecv"===S||"sendonly"===S),!_||"sendrecv"!==S&&"sendonly"!==S?delete C.rtpReceiver:(D=_.track,T?(n[T.stream]||(n[T.stream]=new c.MediaStream),p(D,n[T.stream]),f.push([D,_,n[T.stream]])):(n.default||(n.default=new c.MediaStream),p(D,n.default),f.push([D,_,n.default])))}}else{(C=r.transceivers[o]||r._createTransceiver(u)).mid=E,C.iceGatherer||(C.iceGatherer=r._createIceGatherer(o,m)),j.length&&"new"===C.iceTransport.state&&(!G||m&&0!==o?j.forEach(function(e){s(C.iceTransport,e)}):C.iceTransport.setRemoteCandidates(j)),x=c.RTCRtpReceiver.getCapabilities(u),d<15019&&(x.codecs=x.codecs.filter(function(e){return"rtx"!==e.name})),k=C.sendEncodingParameters||[{ssrc:1001*(2*o+2)}];var N,A=!1;if("sendrecv"===S||"sendonly"===S){if(A=!C.rtpReceiver,_=C.rtpReceiver||new c.RTCRtpReceiver(C.dtlsTransport,u),A)D=_.track,T&&"-"===T.stream||(T?(n[T.stream]||(n[T.stream]=new c.MediaStream,Object.defineProperty(n[T.stream],"id",{get:function(){return T.stream}})),Object.defineProperty(D,"id",{get:function(){return T.track}}),N=n[T.stream]):(n.default||(n.default=new c.MediaStream),N=n.default)),N&&(p(D,N),C.associatedRemoteMediaStreams.push(N)),f.push([D,_,N])}else C.rtpReceiver&&C.rtpReceiver.track&&(C.associatedRemoteMediaStreams.forEach(function(e){var t,r,n=e.getTracks().find(function(e){return e.id===C.rtpReceiver.track.id});n&&(t=n,(r=e).removeTrack(t),r.dispatchEvent(new c.MediaStreamTrackEvent("removetrack",{track:t})))}),C.associatedRemoteMediaStreams=[]);C.localCapabilities=x,C.remoteCapabilities=M,C.rtpReceiver=_,C.rtcpParameters=O,C.sendEncodingParameters=k,C.recvEncodingParameters=b,r._transceive(r.transceivers[o],!1,A)}}}),void 0===r._dtlsRole&&(r._dtlsRole="offer"===t.type?"active":"passive"),r._remoteDescription={type:t.type,sdp:t.sdp},"offer"===t.type?r._updateSignalingState("have-remote-offer"):r._updateSignalingState("stable"),Object.keys(n).forEach(function(e){var t=n[e];if(t.getTracks().length){if(-1===r.remoteStreams.indexOf(t)){r.remoteStreams.push(t);var a=new Event("addstream");a.stream=t,c.setTimeout(function(){r._dispatchEvent("addstream",a)})}f.forEach(function(e){var n=e[0],a=e[1];t.id===e[2].id&&l(r,n,a,[t])})}}),f.forEach(function(e){e[2]||l(r,e[0],e[1],[])}),c.setTimeout(function(){r&&r.transceivers&&r.transceivers.forEach(function(e){e.iceTransport&&"new"===e.iceTransport.state&&e.iceTransport.getRemoteCandidates().length>0&&(console.warn("Timeout for addRemoteCandidate. Consider sending an end-of-candidates notification"),e.iceTransport.addRemoteCandidate({}))})},4e3),Promise.resolve()},f.prototype.close=function(){this.transceivers.forEach(function(e){e.iceTransport&&e.iceTransport.stop(),e.dtlsTransport&&e.dtlsTransport.stop(),e.rtpSender&&e.rtpSender.stop(),e.rtpReceiver&&e.rtpReceiver.stop()}),this._isClosed=!0,this._updateSignalingState("closed")},f.prototype._updateSignalingState=function(e){this.signalingState=e;var t=new Event("signalingstatechange");this._dispatchEvent("signalingstatechange",t)},f.prototype._maybeFireNegotiationNeeded=function(){var e=this;"stable"===this.signalingState&&!0!==this.needNegotiation&&(this.needNegotiation=!0,c.setTimeout(function(){if(e.needNegotiation){e.needNegotiation=!1;var t=new Event("negotiationneeded");e._dispatchEvent("negotiationneeded",t)}},0))},f.prototype._updateIceConnectionState=function(){var e,t={new:0,closed:0,checking:0,connected:0,completed:0,disconnected:0,failed:0};if(this.transceivers.forEach(function(e){e.iceTransport&&!e.rejected&&t[e.iceTransport.state]++}),e="new",t.failed>0?e="failed":t.checking>0?e="checking":t.disconnected>0?e="disconnected":t.new>0?e="new":t.connected>0?e="connected":t.completed>0&&(e="completed"),e!==this.iceConnectionState){this.iceConnectionState=e;var r=new Event("iceconnectionstatechange");this._dispatchEvent("iceconnectionstatechange",r)}},f.prototype._updateConnectionState=function(){var e,t={new:0,closed:0,connecting:0,connected:0,completed:0,disconnected:0,failed:0};if(this.transceivers.forEach(function(e){e.iceTransport&&e.dtlsTransport&&!e.rejected&&(t[e.iceTransport.state]++,t[e.dtlsTransport.state]++)}),t.connected+=t.completed,e="new",t.failed>0?e="failed":t.connecting>0?e="connecting":t.disconnected>0?e="disconnected":t.new>0?e="new":t.connected>0&&(e="connected"),e!==this.connectionState){this.connectionState=e;var r=new Event("connectionstatechange");this._dispatchEvent("connectionstatechange",r)}},f.prototype.createOffer=function(){var t=this;if(t._isClosed)return Promise.reject(o("InvalidStateError","Can not call createOffer after close"));var n=t.transceivers.filter(function(e){return"audio"===e.kind}).length,a=t.transceivers.filter(function(e){return"video"===e.kind}).length,i=arguments[0];if(i){if(i.mandatory||i.optional)throw new TypeError("Legacy mandatory/optional constraints not supported.");void 0!==i.offerToReceiveAudio&&(n=!0===i.offerToReceiveAudio?1:!1===i.offerToReceiveAudio?0:i.offerToReceiveAudio),void 0!==i.offerToReceiveVideo&&(a=!0===i.offerToReceiveVideo?1:!1===i.offerToReceiveVideo?0:i.offerToReceiveVideo)}for(t.transceivers.forEach(function(e){"audio"===e.kind?--n<0&&(e.wantReceive=!1):"video"===e.kind&&--a<0&&(e.wantReceive=!1)});n>0||a>0;)n>0&&(t._createTransceiver("audio"),n--),a>0&&(t._createTransceiver("video"),a--);var s=e.writeSessionBoilerplate(t._sdpSessionId,t._sdpSessionVersion++);t.transceivers.forEach(function(r,n){var a=r.track,i=r.kind,s=r.mid||e.generateIdentifier();r.mid=s,r.iceGatherer||(r.iceGatherer=t._createIceGatherer(n,t.usingBundle));var o=c.RTCRtpSender.getCapabilities(i);d<15019&&(o.codecs=o.codecs.filter(function(e){return"rtx"!==e.name})),o.codecs.forEach(function(e){"H264"===e.name&&void 0===e.parameters["level-asymmetry-allowed"]&&(e.parameters["level-asymmetry-allowed"]="1"),r.remoteCapabilities&&r.remoteCapabilities.codecs&&r.remoteCapabilities.codecs.forEach(function(t){e.name.toLowerCase()===t.name.toLowerCase()&&e.clockRate===t.clockRate&&(e.preferredPayloadType=t.payloadType)})}),o.headerExtensions.forEach(function(e){(r.remoteCapabilities&&r.remoteCapabilities.headerExtensions||[]).forEach(function(t){e.uri===t.uri&&(e.id=t.id)})});var p=r.sendEncodingParameters||[{ssrc:1001*(2*n+1)}];a&&d>=15019&&"video"===i&&!p[0].rtx&&(p[0].rtx={ssrc:p[0].ssrc+1}),r.wantReceive&&(r.rtpReceiver=new c.RTCRtpReceiver(r.dtlsTransport,i)),r.localCapabilities=o,r.sendEncodingParameters=p}),"max-compat"!==t._config.bundlePolicy&&(s+="a=group:BUNDLE "+t.transceivers.map(function(e){return e.mid}).join(" ")+"\r\n"),s+="a=ice-options:trickle\r\n",t.transceivers.forEach(function(n,a){s+=r(n,n.localCapabilities,"offer",n.stream,t._dtlsRole),s+="a=rtcp-rsize\r\n",!n.iceGatherer||"new"===t.iceGatheringState||0!==a&&t.usingBundle||(n.iceGatherer.getLocalCandidates().forEach(function(t){t.component=1,s+="a="+e.writeCandidate(t)+"\r\n"}),"completed"===n.iceGatherer.state&&(s+="a=end-of-candidates\r\n"))});var p=new c.RTCSessionDescription({type:"offer",sdp:s});return Promise.resolve(p)},f.prototype.createAnswer=function(){var t=this;if(t._isClosed)return Promise.reject(o("InvalidStateError","Can not call createAnswer after close"));if("have-remote-offer"!==t.signalingState&&"have-local-pranswer"!==t.signalingState)return Promise.reject(o("InvalidStateError","Can not call createAnswer in signalingState "+t.signalingState));var n=e.writeSessionBoilerplate(t._sdpSessionId,t._sdpSessionVersion++);t.usingBundle&&(n+="a=group:BUNDLE "+t.transceivers.map(function(e){return e.mid}).join(" ")+"\r\n"),n+="a=ice-options:trickle\r\n";var i=e.getMediaSections(t._remoteDescription.sdp).length;t.transceivers.forEach(function(e,s){if(!(s+1>i)){if(e.rejected)return"application"===e.kind?"DTLS/SCTP"===e.protocol?n+="m=application 0 DTLS/SCTP 5000\r\n":n+="m=application 0 "+e.protocol+" webrtc-datachannel\r\n":"audio"===e.kind?n+="m=audio 0 UDP/TLS/RTP/SAVPF 0\r\na=rtpmap:0 PCMU/8000\r\n":"video"===e.kind&&(n+="m=video 0 UDP/TLS/RTP/SAVPF 120\r\na=rtpmap:120 VP8/90000\r\n"),void(n+="c=IN IP4 0.0.0.0\r\na=inactive\r\na=mid:"+e.mid+"\r\n");var o;if(e.stream)"audio"===e.kind?o=e.stream.getAudioTracks()[0]:"video"===e.kind&&(o=e.stream.getVideoTracks()[0]),o&&d>=15019&&"video"===e.kind&&!e.sendEncodingParameters[0].rtx&&(e.sendEncodingParameters[0].rtx={ssrc:e.sendEncodingParameters[0].ssrc+1});var c=a(e.localCapabilities,e.remoteCapabilities);!c.codecs.filter(function(e){return"rtx"===e.name.toLowerCase()}).length&&e.sendEncodingParameters[0].rtx&&delete e.sendEncodingParameters[0].rtx,n+=r(e,c,"answer",e.stream,t._dtlsRole),e.rtcpParameters&&e.rtcpParameters.reducedSize&&(n+="a=rtcp-rsize\r\n")}});var s=new c.RTCSessionDescription({type:"answer",sdp:n});return Promise.resolve(s)},f.prototype.addIceCandidate=function(t){var r,n=this;return t&&void 0===t.sdpMLineIndex&&!t.sdpMid?Promise.reject(new TypeError("sdpMLineIndex or sdpMid required")):new Promise(function(a,i){if(!n._remoteDescription)return i(o("InvalidStateError","Can not add ICE candidate without a remote description"));if(t&&""!==t.candidate){var c=t.sdpMLineIndex;if(t.sdpMid)for(var d=0;d<n.transceivers.length;d++)if(n.transceivers[d].mid===t.sdpMid){c=d;break}var p=n.transceivers[c];if(!p)return i(o("OperationError","Can not add ICE candidate"));if(p.rejected)return a();var l=Object.keys(t.candidate).length>0?e.parseCandidate(t.candidate):{};if("tcp"===l.protocol&&(0===l.port||9===l.port))return a();if(l.component&&1!==l.component)return a();if((0===c||c>0&&p.iceTransport!==n.transceivers[0].iceTransport)&&!s(p.iceTransport,l))return i(o("OperationError","Can not add ICE candidate"));var f=t.candidate.trim();0===f.indexOf("a=")&&(f=f.substr(2)),(r=e.getMediaSections(n._remoteDescription.sdp))[c]+="a="+(l.type?f:"end-of-candidates")+"\r\n",n._remoteDescription.sdp=e.getDescription(n._remoteDescription.sdp)+r.join("")}else for(var u=0;u<n.transceivers.length&&(n.transceivers[u].rejected||(n.transceivers[u].iceTransport.addRemoteCandidate({}),(r=e.getMediaSections(n._remoteDescription.sdp))[u]+="a=end-of-candidates\r\n",n._remoteDescription.sdp=e.getDescription(n._remoteDescription.sdp)+r.join(""),!n.usingBundle));u++);a()})},f.prototype.getStats=function(e){if(e&&e instanceof c.MediaStreamTrack){var t=null;if(this.transceivers.forEach(function(r){r.rtpSender&&r.rtpSender.track===e?t=r.rtpSender:r.rtpReceiver&&r.rtpReceiver.track===e&&(t=r.rtpReceiver)}),!t)throw o("InvalidAccessError","Invalid selector.");return t.getStats()}var r=[];return this.transceivers.forEach(function(e){["rtpSender","rtpReceiver","iceGatherer","iceTransport","dtlsTransport"].forEach(function(t){e[t]&&r.push(e[t].getStats())})}),Promise.all(r).then(function(e){var t=new Map;return e.forEach(function(e){e.forEach(function(e){t.set(e.id,e)})}),t})};["RTCRtpSender","RTCRtpReceiver","RTCIceGatherer","RTCIceTransport","RTCDtlsTransport"].forEach(function(e){var r=c[e];if(r&&r.prototype&&r.prototype.getStats){var n=r.prototype.getStats;r.prototype.getStats=function(){return n.apply(this).then(function(e){var r=new Map;return Object.keys(e).forEach(function(n){e[n].type=t(e[n]),r.set(n,e[n])}),r})}}});var u=["createOffer","createAnswer"];return u.forEach(function(e){var t=f.prototype[e];f.prototype[e]=function(){var e=arguments;return"function"==typeof e[0]||"function"==typeof e[1]?t.apply(this,[arguments[2]]).then(function(t){"function"==typeof e[0]&&e[0].apply(null,[t])},function(t){"function"==typeof e[1]&&e[1].apply(null,[t])}):t.apply(this,arguments)}}),(u=["setLocalDescription","setRemoteDescription","addIceCandidate"]).forEach(function(e){var t=f.prototype[e];f.prototype[e]=function(){var e=arguments;return"function"==typeof e[1]||"function"==typeof e[2]?t.apply(this,arguments).then(function(){"function"==typeof e[1]&&e[1].apply(null)},function(t){"function"==typeof e[2]&&e[2].apply(null,[t])}):t.apply(this,arguments)}}),["getStats"].forEach(function(e){var t=f.prototype[e];f.prototype[e]=function(){var e=arguments;return"function"==typeof e[1]?t.apply(this,arguments).then(function(){"function"==typeof e[1]&&e[1].apply(null)}):t.apply(this,arguments)}}),f};
--},{"sdp":"YHvh"}],"YdKx":[function(require,module,exports) {
--"use strict";function e(e){var r=e&&e.navigator,t=r.mediaDevices.getUserMedia.bind(r.mediaDevices);r.mediaDevices.getUserMedia=function(e){return t(e).catch(function(e){return Promise.reject(function(e){return{name:{PermissionDeniedError:"NotAllowedError"}[e.name]||e.name,message:e.message,constraint:e.constraint,toString:function(){return this.name}}}(e))})}}Object.defineProperty(exports,"__esModule",{value:!0}),exports.shimGetUserMedia=e;
--},{}],"P3bV":[function(require,module,exports) {
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--},{}],"XRic":[function(require,module,exports) {
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--},{"../utils":"iSxC","./filtericeservers":"NZ1C","rtcpeerconnection-shim":"NJ2u","./getusermedia":"YdKx","./getdisplaymedia":"P3bV"}],"GzSv":[function(require,module,exports) {
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--},{"../utils":"iSxC"}],"UuGU":[function(require,module,exports) {
--"use strict";function e(e,i){e.navigator.mediaDevices&&"getDisplayMedia"in e.navigator.mediaDevices||e.navigator.mediaDevices&&(e.navigator.mediaDevices.getDisplayMedia=function(a){if(!a||!a.video){var t=new DOMException("getDisplayMedia without video constraints is undefined");return t.name="NotFoundError",t.code=8,Promise.reject(t)}return!0===a.video?a.video={mediaSource:i}:a.video.mediaSource=i,e.navigator.mediaDevices.getUserMedia(a)})}Object.defineProperty(exports,"__esModule",{value:!0}),exports.shimGetDisplayMedia=e;
--},{}],"Fzdr":[function(require,module,exports) {
--"use strict";Object.defineProperty(exports,"__esModule",{value:!0}),exports.shimOnTrack=s,exports.shimPeerConnection=c,exports.shimSenderGetStats=p,exports.shimReceiverGetStats=u,exports.shimRemoveStream=f,exports.shimRTCDataChannel=d,exports.shimAddTransceiver=C,exports.shimGetParameters=y,exports.shimCreateOffer=l,exports.shimCreateAnswer=m,Object.defineProperty(exports,"shimGetUserMedia",{enumerable:!0,get:function(){return t.shimGetUserMedia}}),Object.defineProperty(exports,"shimGetDisplayMedia",{enumerable:!0,get:function(){return n.shimGetDisplayMedia}});var e=o(require("../utils")),t=require("./getusermedia"),n=require("./getdisplaymedia");function r(){if("function"!=typeof WeakMap)return null;var e=new WeakMap;return r=function(){return e},e}function o(e){if(e&&e.__esModule)return e;if(null===e||"object"!=typeof e&&"function"!=typeof e)return{default:e};var t=r();if(t&&t.has(e))return t.get(e);var n={},o=Object.defineProperty&&Object.getOwnPropertyDescriptor;for(var i in e)if(Object.prototype.hasOwnProperty.call(e,i)){var a=o?Object.getOwnPropertyDescriptor(e,i):null;a&&(a.get||a.set)?Object.defineProperty(n,i,a):n[i]=e[i]}return n.default=e,t&&t.set(e,n),n}function i(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}function a(e){return(a="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function s(e){"object"===a(e)&&e.RTCTrackEvent&&"receiver"in e.RTCTrackEvent.prototype&&!("transceiver"in e.RTCTrackEvent.prototype)&&Object.defineProperty(e.RTCTrackEvent.prototype,"transceiver",{get:function(){return{receiver:this.receiver}}})}function c(e,t){if("object"===a(e)&&(e.RTCPeerConnection||e.mozRTCPeerConnection)){!e.RTCPeerConnection&&e.mozRTCPeerConnection&&(e.RTCPeerConnection=e.mozRTCPeerConnection),t.version<53&&["setLocalDescription","setRemoteDescription","addIceCandidate"].forEach(function(t){var n=e.RTCPeerConnection.prototype[t],r=i({},t,function(){return arguments[0]=new("addIceCandidate"===t?e.RTCIceCandidate:e.RTCSessionDescription)(arguments[0]),n.apply(this,arguments)});e.RTCPeerConnection.prototype[t]=r[t]});var n={inboundrtp:"inbound-rtp",outboundrtp:"outbound-rtp",candidatepair:"candidate-pair",localcandidate:"local-candidate",remotecandidate:"remote-candidate"},r=e.RTCPeerConnection.prototype.getStats;e.RTCPeerConnection.prototype.getStats=function(){var[e,o,i]=arguments;return r.apply(this,[e||null]).then(function(e){if(t.version<53&&!o)try{e.forEach(function(e){e.type=n[e.type]||e.type})}catch(r){if("TypeError"!==r.name)throw r;e.forEach(function(t,r){e.set(r,Object.assign({},t,{type:n[t.type]||t.type}))})}return e}).then(o,i)}}}function p(e){if("object"===a(e)&&e.RTCPeerConnection&&e.RTCRtpSender&&!(e.RTCRtpSender&&"getStats"in e.RTCRtpSender.prototype)){var t=e.RTCPeerConnection.prototype.getSenders;t&&(e.RTCPeerConnection.prototype.getSenders=function(){var e=this,n=t.apply(this,[]);return n.forEach(function(t){return t._pc=e}),n});var n=e.RTCPeerConnection.prototype.addTrack;n&&(e.RTCPeerConnection.prototype.addTrack=function(){var e=n.apply(this,arguments);return e._pc=this,e}),e.RTCRtpSender.prototype.getStats=function(){return this.track?this._pc.getStats(this.track):Promise.resolve(new Map)}}}function u(t){if("object"===a(t)&&t.RTCPeerConnection&&t.RTCRtpSender&&!(t.RTCRtpSender&&"getStats"in t.RTCRtpReceiver.prototype)){var n=t.RTCPeerConnection.prototype.getReceivers;n&&(t.RTCPeerConnection.prototype.getReceivers=function(){var e=this,t=n.apply(this,[]);return t.forEach(function(t){return t._pc=e}),t}),e.wrapPeerConnectionEvent(t,"track",function(e){return e.receiver._pc=e.srcElement,e}),t.RTCRtpReceiver.prototype.getStats=function(){return this._pc.getStats(this.track)}}}function f(t){!t.RTCPeerConnection||"removeStream"in t.RTCPeerConnection.prototype||(t.RTCPeerConnection.prototype.removeStream=function(t){var n=this;e.deprecated("removeStream","removeTrack"),this.getSenders().forEach(function(e){e.track&&t.getTracks().includes(e.track)&&n.removeTrack(e)})})}function d(e){e.DataChannel&&!e.RTCDataChannel&&(e.RTCDataChannel=e.DataChannel)}function C(e){if("object"===a(e)&&e.RTCPeerConnection){var t=e.RTCPeerConnection.prototype.addTransceiver;t&&(e.RTCPeerConnection.prototype.addTransceiver=function(){this.setParametersPromises=[];var e=arguments[1],n=e&&"sendEncodings"in e;n&&e.sendEncodings.forEach(function(e){if("rid"in e){if(!/^[a-z0-9]{0,16}$/i.test(e.rid))throw new TypeError("Invalid RID value provided.")}if("scaleResolutionDownBy"in e&&!(parseFloat(e.scaleResolutionDownBy)>=1))throw new RangeError("scale_resolution_down_by must be >= 1.0");if("maxFramerate"in e&&!(parseFloat(e.maxFramerate)>=0))throw new RangeError("max_framerate must be >= 0.0")});var r=t.apply(this,arguments);if(n){var{sender:o}=r,i=o.getParameters();"encodings"in i&&(1!==i.encodings.length||0!==Object.keys(i.encodings[0]).length)||(i.encodings=e.sendEncodings,o.sendEncodings=e.sendEncodings,this.setParametersPromises.push(o.setParameters(i).then(function(){delete o.sendEncodings}).catch(function(){delete o.sendEncodings})))}return r})}}function y(e){if("object"===a(e)&&e.RTCRtpSender){var t=e.RTCRtpSender.prototype.getParameters;t&&(e.RTCRtpSender.prototype.getParameters=function(){var e=t.apply(this,arguments);return"encodings"in e||(e.encodings=[].concat(this.sendEncodings||[{}])),e})}}function l(e){if("object"===a(e)&&e.RTCPeerConnection){var t=e.RTCPeerConnection.prototype.createOffer;e.RTCPeerConnection.prototype.createOffer=function(){var e=arguments,n=this;return this.setParametersPromises&&this.setParametersPromises.length?Promise.all(this.setParametersPromises).then(function(){return t.apply(n,e)}).finally(function(){n.setParametersPromises=[]}):t.apply(this,arguments)}}}function m(e){if("object"===a(e)&&e.RTCPeerConnection){var t=e.RTCPeerConnection.prototype.createAnswer;e.RTCPeerConnection.prototype.createAnswer=function(){var e=arguments,n=this;return this.setParametersPromises&&this.setParametersPromises.length?Promise.all(this.setParametersPromises).then(function(){return t.apply(n,e)}).finally(function(){n.setParametersPromises=[]}):t.apply(this,arguments)}}}
--},{"../utils":"iSxC","./getusermedia":"GzSv","./getdisplaymedia":"UuGU"}],"t1lL":[function(require,module,exports) {
--"use strict";Object.defineProperty(exports,"__esModule",{value:!0}),exports.shimLocalStreamsAPI=n,exports.shimRemoteStreamsAPI=i,exports.shimCallbacksAPI=a,exports.shimGetUserMedia=c,exports.shimConstraints=s,exports.shimRTCIceServerUrls=d,exports.shimTrackEventTransceiver=f,exports.shimCreateOfferLegacy=p,exports.shimAudioContext=u;var e=r(require("../utils"));function t(){if("function"!=typeof WeakMap)return null;var e=new WeakMap;return t=function(){return e},e}function r(e){if(e&&e.__esModule)return e;if(null===e||"object"!=typeof e&&"function"!=typeof e)return{default:e};var r=t();if(r&&r.has(e))return r.get(e);var o={},n=Object.defineProperty&&Object.getOwnPropertyDescriptor;for(var i in e)if(Object.prototype.hasOwnProperty.call(e,i)){var a=n?Object.getOwnPropertyDescriptor(e,i):null;a&&(a.get||a.set)?Object.defineProperty(o,i,a):o[i]=e[i]}return o.default=e,r&&r.set(e,o),o}function o(e){return(o="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function n(e){if("object"===o(e)&&e.RTCPeerConnection){if("getLocalStreams"in e.RTCPeerConnection.prototype||(e.RTCPeerConnection.prototype.getLocalStreams=function(){return this._localStreams||(this._localStreams=[]),this._localStreams}),!("addStream"in e.RTCPeerConnection.prototype)){var t=e.RTCPeerConnection.prototype.addTrack;e.RTCPeerConnection.prototype.addStream=function(e){var r=this;this._localStreams||(this._localStreams=[]),this._localStreams.includes(e)||this._localStreams.push(e),e.getAudioTracks().forEach(function(o){return t.call(r,o,e)}),e.getVideoTracks().forEach(function(o){return t.call(r,o,e)})},e.RTCPeerConnection.prototype.addTrack=function(e){for(var r=this,o=arguments.length,n=new Array(o>1?o-1:0),i=1;i<o;i++)n[i-1]=arguments[i];return n&&n.forEach(function(e){r._localStreams?r._localStreams.includes(e)||r._localStreams.push(e):r._localStreams=[e]}),t.apply(this,arguments)}}"removeStream"in e.RTCPeerConnection.prototype||(e.RTCPeerConnection.prototype.removeStream=function(e){var t=this;this._localStreams||(this._localStreams=[]);var r=this._localStreams.indexOf(e);if(-1!==r){this._localStreams.splice(r,1);var o=e.getTracks();this.getSenders().forEach(function(e){o.includes(e.track)&&t.removeTrack(e)})}})}}function i(e){if("object"===o(e)&&e.RTCPeerConnection&&("getRemoteStreams"in e.RTCPeerConnection.prototype||(e.RTCPeerConnection.prototype.getRemoteStreams=function(){return this._remoteStreams?this._remoteStreams:[]}),!("onaddstream"in e.RTCPeerConnection.prototype))){Object.defineProperty(e.RTCPeerConnection.prototype,"onaddstream",{get:function(){return this._onaddstream},set:function(e){var t=this;this._onaddstream&&(this.removeEventListener("addstream",this._onaddstream),this.removeEventListener("track",this._onaddstreampoly)),this.addEventListener("addstream",this._onaddstream=e),this.addEventListener("track",this._onaddstreampoly=function(e){e.streams.forEach(function(e){if(t._remoteStreams||(t._remoteStreams=[]),!t._remoteStreams.includes(e)){t._remoteStreams.push(e);var r=new Event("addstream");r.stream=e,t.dispatchEvent(r)}})})}});var t=e.RTCPeerConnection.prototype.setRemoteDescription;e.RTCPeerConnection.prototype.setRemoteDescription=function(){var e=this;return this._onaddstreampoly||this.addEventListener("track",this._onaddstreampoly=function(t){t.streams.forEach(function(t){if(e._remoteStreams||(e._remoteStreams=[]),!(e._remoteStreams.indexOf(t)>=0)){e._remoteStreams.push(t);var r=new Event("addstream");r.stream=t,e.dispatchEvent(r)}})}),t.apply(e,arguments)}}}function a(e){if("object"===o(e)&&e.RTCPeerConnection){var t=e.RTCPeerConnection.prototype,r=t.createOffer,n=t.createAnswer,i=t.setLocalDescription,a=t.setRemoteDescription,c=t.addIceCandidate;t.createOffer=function(e,t){var o=arguments.length>=2?arguments[2]:arguments[0],n=r.apply(this,[o]);return t?(n.then(e,t),Promise.resolve()):n},t.createAnswer=function(e,t){var r=arguments.length>=2?arguments[2]:arguments[0],o=n.apply(this,[r]);return t?(o.then(e,t),Promise.resolve()):o};var s=function(e,t,r){var o=i.apply(this,[e]);return r?(o.then(t,r),Promise.resolve()):o};t.setLocalDescription=s,s=function(e,t,r){var o=a.apply(this,[e]);return r?(o.then(t,r),Promise.resolve()):o},t.setRemoteDescription=s,s=function(e,t,r){var o=c.apply(this,[e]);return r?(o.then(t,r),Promise.resolve()):o},t.addIceCandidate=s}}function c(e){var t=e&&e.navigator;if(t.mediaDevices&&t.mediaDevices.getUserMedia){var r=t.mediaDevices,o=r.getUserMedia.bind(r);t.mediaDevices.getUserMedia=function(e){return o(s(e))}}!t.getUserMedia&&t.mediaDevices&&t.mediaDevices.getUserMedia&&(t.getUserMedia=function(e,r,o){t.mediaDevices.getUserMedia(e).then(r,o)}.bind(t))}function s(t){return t&&void 0!==t.video?Object.assign({},t,{video:e.compactObject(t.video)}):t}function d(t){if(t.RTCPeerConnection){var r=t.RTCPeerConnection;t.RTCPeerConnection=function(t,o){if(t&&t.iceServers){for(var n=[],i=0;i<t.iceServers.length;i++){var a=t.iceServers[i];!a.hasOwnProperty("urls")&&a.hasOwnProperty("url")?(e.deprecated("RTCIceServer.url","RTCIceServer.urls"),(a=JSON.parse(JSON.stringify(a))).urls=a.url,delete a.url,n.push(a)):n.push(t.iceServers[i])}t.iceServers=n}return new r(t,o)},t.RTCPeerConnection.prototype=r.prototype,"generateCertificate"in r&&Object.defineProperty(t.RTCPeerConnection,"generateCertificate",{get:function(){return r.generateCertificate}})}}function f(e){"object"===o(e)&&e.RTCTrackEvent&&"receiver"in e.RTCTrackEvent.prototype&&!("transceiver"in e.RTCTrackEvent.prototype)&&Object.defineProperty(e.RTCTrackEvent.prototype,"transceiver",{get:function(){return{receiver:this.receiver}}})}function p(e){var t=e.RTCPeerConnection.prototype.createOffer;e.RTCPeerConnection.prototype.createOffer=function(e){if(e){void 0!==e.offerToReceiveAudio&&(e.offerToReceiveAudio=!!e.offerToReceiveAudio);var r=this.getTransceivers().find(function(e){return"audio"===e.receiver.track.kind});!1===e.offerToReceiveAudio&&r?"sendrecv"===r.direction?r.setDirection?r.setDirection("sendonly"):r.direction="sendonly":"recvonly"===r.direction&&(r.setDirection?r.setDirection("inactive"):r.direction="inactive"):!0!==e.offerToReceiveAudio||r||this.addTransceiver("audio"),void 0!==e.offerToReceiveVideo&&(e.offerToReceiveVideo=!!e.offerToReceiveVideo);var o=this.getTransceivers().find(function(e){return"video"===e.receiver.track.kind});!1===e.offerToReceiveVideo&&o?"sendrecv"===o.direction?o.setDirection?o.setDirection("sendonly"):o.direction="sendonly":"recvonly"===o.direction&&(o.setDirection?o.setDirection("inactive"):o.direction="inactive"):!0!==e.offerToReceiveVideo||o||this.addTransceiver("video")}return t.apply(this,arguments)}}function u(e){"object"!==o(e)||e.AudioContext||(e.AudioContext=e.webkitAudioContext)}
--},{"../utils":"iSxC"}],"GOQK":[function(require,module,exports) {
--"use strict";Object.defineProperty(exports,"__esModule",{value:!0}),exports.shimRTCIceCandidate=a,exports.shimMaxMessageSize=c,exports.shimSendThrowTypeError=s,exports.shimConnectionState=p,exports.removeExtmapAllowMixed=d,exports.shimAddIceCandidateNullOrEmpty=u;var e=r(require("sdp")),t=o(require("./utils"));function n(){if("function"!=typeof WeakMap)return null;var e=new WeakMap;return n=function(){return e},e}function o(e){if(e&&e.__esModule)return e;if(null===e||"object"!=typeof e&&"function"!=typeof e)return{default:e};var t=n();if(t&&t.has(e))return t.get(e);var o={},r=Object.defineProperty&&Object.getOwnPropertyDescriptor;for(var i in e)if(Object.prototype.hasOwnProperty.call(e,i)){var a=r?Object.getOwnPropertyDescriptor(e,i):null;a&&(a.get||a.set)?Object.defineProperty(o,i,a):o[i]=e[i]}return o.default=e,t&&t.set(e,o),o}function r(e){return e&&e.__esModule?e:{default:e}}function i(e){return(i="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function a(n){if(n.RTCIceCandidate&&!(n.RTCIceCandidate&&"foundation"in n.RTCIceCandidate.prototype)){var o=n.RTCIceCandidate;n.RTCIceCandidate=function(t){if("object"===i(t)&&t.candidate&&0===t.candidate.indexOf("a=")&&((t=JSON.parse(JSON.stringify(t))).candidate=t.candidate.substr(2)),t.candidate&&t.candidate.length){var n=new o(t),r=e.default.parseCandidate(t.candidate),a=Object.assign(n,r);return a.toJSON=function(){return{candidate:a.candidate,sdpMid:a.sdpMid,sdpMLineIndex:a.sdpMLineIndex,usernameFragment:a.usernameFragment}},a}return new o(t)},n.RTCIceCandidate.prototype=o.prototype,t.wrapPeerConnectionEvent(n,"icecandidate",function(e){return e.candidate&&Object.defineProperty(e,"candidate",{value:new n.RTCIceCandidate(e.candidate),writable:"false"}),e})}}function c(t,n){if(t.RTCPeerConnection){"sctp"in t.RTCPeerConnection.prototype||Object.defineProperty(t.RTCPeerConnection.prototype,"sctp",{get:function(){return void 0===this._sctp?null:this._sctp}});var o=t.RTCPeerConnection.prototype.setRemoteDescription;t.RTCPeerConnection.prototype.setRemoteDescription=function(){if(this._sctp=null,"chrome"===n.browser&&n.version>=76){var{sdpSemantics:t}=this.getConfiguration();"plan-b"===t&&Object.defineProperty(this,"sctp",{get:function(){return void 0===this._sctp?null:this._sctp},enumerable:!0,configurable:!0})}if(function(t){if(!t||!t.sdp)return!1;var n=e.default.splitSections(t.sdp);return n.shift(),n.some(function(t){var n=e.default.parseMLine(t);return n&&"application"===n.kind&&-1!==n.protocol.indexOf("SCTP")})}(arguments[0])){var r,i=function(e){var t=e.sdp.match(/mozilla...THIS_IS_SDPARTA-(\d+)/);if(null===t||t.length<2)return-1;var n=parseInt(t[1],10);return n!=n?-1:n}(arguments[0]),a=(p=i,d=65536,"firefox"===n.browser&&(d=n.version<57?-1===p?16384:2147483637:n.version<60?57===n.version?65535:65536:2147483637),d),c=function(t,o){var r=65536;"firefox"===n.browser&&57===n.version&&(r=65535);var i=e.default.matchPrefix(t.sdp,"a=max-message-size:");return i.length>0?r=parseInt(i[0].substr(19),10):"firefox"===n.browser&&-1!==o&&(r=2147483637),r}(arguments[0],i);r=0===a&&0===c?Number.POSITIVE_INFINITY:0===a||0===c?Math.max(a,c):Math.min(a,c);var s={};Object.defineProperty(s,"maxMessageSize",{get:function(){return r}}),this._sctp=s}var p,d;return o.apply(this,arguments)}}}function s(e){if(e.RTCPeerConnection&&"createDataChannel"in e.RTCPeerConnection.prototype){var n=e.RTCPeerConnection.prototype.createDataChannel;e.RTCPeerConnection.prototype.createDataChannel=function(){var e=n.apply(this,arguments);return o(e,this),e},t.wrapPeerConnectionEvent(e,"datachannel",function(e){return o(e.channel,e.target),e})}function o(e,t){var n=e.send;e.send=function(){var o=arguments[0],r=o.length||o.size||o.byteLength;if("open"===e.readyState&&t.sctp&&r>t.sctp.maxMessageSize)throw new TypeError("Message too large (can send a maximum of "+t.sctp.maxMessageSize+" bytes)");return n.apply(e,arguments)}}}function p(e){if(e.RTCPeerConnection&&!("connectionState"in e.RTCPeerConnection.prototype)){var t=e.RTCPeerConnection.prototype;Object.defineProperty(t,"connectionState",{get:function(){return{completed:"connected",checking:"connecting"}[this.iceConnectionState]||this.iceConnectionState},enumerable:!0,configurable:!0}),Object.defineProperty(t,"onconnectionstatechange",{get:function(){return this._onconnectionstatechange||null},set:function(e){this._onconnectionstatechange&&(this.removeEventListener("connectionstatechange",this._onconnectionstatechange),delete this._onconnectionstatechange),e&&this.addEventListener("connectionstatechange",this._onconnectionstatechange=e)},enumerable:!0,configurable:!0}),["setLocalDescription","setRemoteDescription"].forEach(function(e){var n=t[e];t[e]=function(){return this._connectionstatechangepoly||(this._connectionstatechangepoly=function(e){var t=e.target;if(t._lastConnectionState!==t.connectionState){t._lastConnectionState=t.connectionState;var n=new Event("connectionstatechange",e);t.dispatchEvent(n)}return e},this.addEventListener("iceconnectionstatechange",this._connectionstatechangepoly)),n.apply(this,arguments)}})}}function d(e,t){if(e.RTCPeerConnection&&!("chrome"===t.browser&&t.version>=71||"safari"===t.browser&&t.version>=605)){var n=e.RTCPeerConnection.prototype.setRemoteDescription;e.RTCPeerConnection.prototype.setRemoteDescription=function(t){if(t&&t.sdp&&-1!==t.sdp.indexOf("\na=extmap-allow-mixed")){var o=t.sdp.split("\n").filter(function(e){return"a=extmap-allow-mixed"!==e.trim()}).join("\n");e.RTCSessionDescription&&t instanceof e.RTCSessionDescription?arguments[0]=new e.RTCSessionDescription({type:t.type,sdp:o}):t.sdp=o}return n.apply(this,arguments)}}}function u(e,t){if(e.RTCPeerConnection&&e.RTCPeerConnection.prototype){var n=e.RTCPeerConnection.prototype.addIceCandidate;n&&0!==n.length&&(e.RTCPeerConnection.prototype.addIceCandidate=function(){return arguments[0]?("chrome"===t.browser&&t.version<78||"firefox"===t.browser&&t.version<68||"safari"===t.browser)&&arguments[0]&&""===arguments[0].candidate?Promise.resolve():n.apply(this,arguments):(arguments[1]&&arguments[1].apply(null),Promise.resolve())})}}
--},{"sdp":"YHvh","./utils":"iSxC"}],"KtlG":[function(require,module,exports) {
--"use strict";Object.defineProperty(exports,"__esModule",{value:!0}),exports.adapterFactory=o;var e=m(require("./utils")),i=m(require("./chrome/chrome_shim")),r=m(require("./edge/edge_shim")),s=m(require("./firefox/firefox_shim")),t=m(require("./safari/safari_shim")),a=m(require("./common_shim"));function n(){if("function"!=typeof WeakMap)return null;var e=new WeakMap;return n=function(){return e},e}function m(e){if(e&&e.__esModule)return e;if(null===e||"object"!=typeof e&&"function"!=typeof e)return{default:e};var i=n();if(i&&i.has(e))return i.get(e);var r={},s=Object.defineProperty&&Object.getOwnPropertyDescriptor;for(var t in e)if(Object.prototype.hasOwnProperty.call(e,t)){var a=s?Object.getOwnPropertyDescriptor(e,t):null;a&&(a.get||a.set)?Object.defineProperty(r,t,a):r[t]=e[t]}return r.default=e,i&&i.set(e,r),r}function o(){var{window:n}=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},m=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{shimChrome:!0,shimFirefox:!0,shimEdge:!0,shimSafari:!0},o=e.log,h=e.detectBrowser(n),d={browserDetails:h,commonShim:a,extractVersion:e.extractVersion,disableLog:e.disableLog,disableWarnings:e.disableWarnings};switch(h.browser){case"chrome":if(!i||!i.shimPeerConnection||!m.shimChrome)return o("Chrome shim is not included in this adapter release."),d;if(null===h.version)return o("Chrome shim can not determine version, not shimming."),d;o("adapter.js shimming chrome."),d.browserShim=i,a.shimAddIceCandidateNullOrEmpty(n,h),i.shimGetUserMedia(n,h),i.shimMediaStream(n,h),i.shimPeerConnection(n,h),i.shimOnTrack(n,h),i.shimAddTrackRemoveTrack(n,h),i.shimGetSendersWithDtmf(n,h),i.shimGetStats(n,h),i.shimSenderReceiverGetStats(n,h),i.fixNegotiationNeeded(n,h),a.shimRTCIceCandidate(n,h),a.shimConnectionState(n,h),a.shimMaxMessageSize(n,h),a.shimSendThrowTypeError(n,h),a.removeExtmapAllowMixed(n,h);break;case"firefox":if(!s||!s.shimPeerConnection||!m.shimFirefox)return o("Firefox shim is not included in this adapter release."),d;o("adapter.js shimming firefox."),d.browserShim=s,a.shimAddIceCandidateNullOrEmpty(n,h),s.shimGetUserMedia(n,h),s.shimPeerConnection(n,h),s.shimOnTrack(n,h),s.shimRemoveStream(n,h),s.shimSenderGetStats(n,h),s.shimReceiverGetStats(n,h),s.shimRTCDataChannel(n,h),s.shimAddTransceiver(n,h),s.shimGetParameters(n,h),s.shimCreateOffer(n,h),s.shimCreateAnswer(n,h),a.shimRTCIceCandidate(n,h),a.shimConnectionState(n,h),a.shimMaxMessageSize(n,h),a.shimSendThrowTypeError(n,h);break;case"edge":if(!r||!r.shimPeerConnection||!m.shimEdge)return o("MS edge shim is not included in this adapter release."),d;o("adapter.js shimming edge."),d.browserShim=r,r.shimGetUserMedia(n,h),r.shimGetDisplayMedia(n,h),r.shimPeerConnection(n,h),r.shimReplaceTrack(n,h),a.shimMaxMessageSize(n,h),a.shimSendThrowTypeError(n,h);break;case"safari":if(!t||!m.shimSafari)return o("Safari shim is not included in this adapter release."),d;o("adapter.js shimming safari."),d.browserShim=t,a.shimAddIceCandidateNullOrEmpty(n,h),t.shimRTCIceServerUrls(n,h),t.shimCreateOfferLegacy(n,h),t.shimCallbacksAPI(n,h),t.shimLocalStreamsAPI(n,h),t.shimRemoteStreamsAPI(n,h),t.shimTrackEventTransceiver(n,h),t.shimGetUserMedia(n,h),t.shimAudioContext(n,h),a.shimRTCIceCandidate(n,h),a.shimMaxMessageSize(n,h),a.shimSendThrowTypeError(n,h),a.removeExtmapAllowMixed(n,h);break;default:o("Unsupported browser!")}return d}
--},{"./utils":"iSxC","./chrome/chrome_shim":"uI5X","./edge/edge_shim":"XRic","./firefox/firefox_shim":"Fzdr","./safari/safari_shim":"t1lL","./common_shim":"GOQK"}],"tI1X":[function(require,module,exports) {
--"use strict";Object.defineProperty(exports,"__esModule",{value:!0}),exports.default=void 0;var e=require("./adapter_factory.js"),t=(0,e.adapterFactory)({window:"undefined"==typeof window?void 0:window}),d=t;exports.default=d;
--},{"./adapter_factory.js":"KtlG"}],"sXtV":[function(require,module,exports) {
--"use strict";var e=this&&this.__importDefault||function(e){return e&&e.__esModule?e:{default:e}};Object.defineProperty(exports,"__esModule",{value:!0}),exports.webRTCAdapter=void 0;var t=e(require("webrtc-adapter"));exports.webRTCAdapter=t.default;
--},{"webrtc-adapter":"tI1X"}],"I31f":[function(require,module,exports) {
--"use strict";Object.defineProperty(exports,"__esModule",{value:!0}),exports.Supports=void 0;var r=require("./adapter");exports.Supports=new(function(){function e(){this.isIOS=["iPad","iPhone","iPod"].includes(navigator.platform),this.supportedBrowsers=["firefox","chrome","safari"],this.minFirefoxVersion=59,this.minChromeVersion=72,this.minSafariVersion=605}return e.prototype.isWebRTCSupported=function(){return"undefined"!=typeof RTCPeerConnection},e.prototype.isBrowserSupported=function(){var r=this.getBrowser(),e=this.getVersion();return!!this.supportedBrowsers.includes(r)&&("chrome"===r?e>=this.minChromeVersion:"firefox"===r?e>=this.minFirefoxVersion:"safari"===r&&(!this.isIOS&&e>=this.minSafariVersion))},e.prototype.getBrowser=function(){return r.webRTCAdapter.browserDetails.browser},e.prototype.getVersion=function(){return r.webRTCAdapter.browserDetails.version||0},e.prototype.isUnifiedPlanSupported=function(){var e,i=this.getBrowser(),t=r.webRTCAdapter.browserDetails.version||0;if("chrome"===i&&t<72)return!1;if("firefox"===i&&t>=59)return!0;if(!(window.RTCRtpTransceiver&&"currentDirection"in RTCRtpTransceiver.prototype))return!1;var o=!1;try{(e=new RTCPeerConnection).addTransceiver("audio"),o=!0}catch(s){}finally{e&&e.close()}return o},e.prototype.toString=function(){return"Supports: \n    browser:"+this.getBrowser()+" \n    version:"+this.getVersion()+" \n    isIOS:"+this.isIOS+" \n    isWebRTCSupported:"+this.isWebRTCSupported()+" \n    isBrowserSupported:"+this.isBrowserSupported()+" \n    isUnifiedPlanSupported:"+this.isUnifiedPlanSupported()},e}());
--},{"./adapter":"sXtV"}],"BHXf":[function(require,module,exports) {
--"use strict";var e=this&&this.__createBinding||(Object.create?function(e,t,r,o){void 0===o&&(o=r),Object.defineProperty(e,o,{enumerable:!0,get:function(){return t[r]}})}:function(e,t,r,o){void 0===o&&(o=r),e[o]=t[r]}),t=this&&this.__setModuleDefault||(Object.create?function(e,t){Object.defineProperty(e,"default",{enumerable:!0,value:t})}:function(e,t){e.default=t}),r=this&&this.__importStar||function(r){if(r&&r.__esModule)return r;var o={};if(null!=r)for(var n in r)"default"!==n&&Object.prototype.hasOwnProperty.call(r,n)&&e(o,r,n);return t(o,r),o};Object.defineProperty(exports,"__esModule",{value:!0}),exports.util=void 0;var o=r(require("peerjs-js-binarypack")),n=require("./supports"),i={iceServers:[{urls:"stun:stun.l.google.com:19302"},{urls:"turn:0.peerjs.com:3478",username:"peerjs",credential:"peerjsp"}],sdpSemantics:"unified-plan"};exports.util=new(function(){function e(){this.CLOUD_HOST="0.peerjs.com",this.CLOUD_PORT=443,this.chunkedBrowsers={Chrome:1,chrome:1},this.chunkedMTU=16300,this.defaultConfig=i,this.browser=n.Supports.getBrowser(),this.browserVersion=n.Supports.getVersion(),this.supports=function(){var e,t={browser:n.Supports.isBrowserSupported(),webRTC:n.Supports.isWebRTCSupported(),audioVideo:!1,data:!1,binaryBlob:!1,reliable:!1};if(!t.webRTC)return t;try{e=new RTCPeerConnection(i),t.audioVideo=!0;var r=void 0;try{r=e.createDataChannel("_PEERJSTEST",{ordered:!0}),t.data=!0,t.reliable=!!r.ordered;try{r.binaryType="blob",t.binaryBlob=!n.Supports.isIOS}catch(o){}}catch(o){}finally{r&&r.close()}}catch(o){}finally{e&&e.close()}return t}(),this.pack=o.pack,this.unpack=o.unpack,this._dataCount=1}return e.prototype.noop=function(){},e.prototype.validateId=function(e){return!e||/^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/.test(e)},e.prototype.chunk=function(e){for(var t=[],r=e.size,o=Math.ceil(r/exports.util.chunkedMTU),n=0,i=0;i<r;){var a=Math.min(r,i+exports.util.chunkedMTU),u=e.slice(i,a),s={__peerData:this._dataCount,n:n,data:u,total:o};t.push(s),i=a,n++}return this._dataCount++,t},e.prototype.blobToArrayBuffer=function(e,t){var r=new FileReader;return r.onload=function(e){e.target&&t(e.target.result)},r.readAsArrayBuffer(e),r},e.prototype.binaryStringToArrayBuffer=function(e){for(var t=new Uint8Array(e.length),r=0;r<e.length;r++)t[r]=255&e.charCodeAt(r);return t.buffer},e.prototype.randomToken=function(){return Math.random().toString(36).substr(2)},e.prototype.isSecure=function(){return"https:"===location.protocol},e}());
--},{"peerjs-js-binarypack":"kdPp","./supports":"I31f"}],"JJlS":[function(require,module,exports) {
--"use strict";var e=Object.prototype.hasOwnProperty,t="~";function n(){}function r(e,t,n){this.fn=e,this.context=t,this.once=n||!1}function o(e,n,o,s,i){if("function"!=typeof o)throw new TypeError("The listener must be a function");var c=new r(o,s||e,i),f=t?t+n:n;return e._events[f]?e._events[f].fn?e._events[f]=[e._events[f],c]:e._events[f].push(c):(e._events[f]=c,e._eventsCount++),e}function s(e,t){0==--e._eventsCount?e._events=new n:delete e._events[t]}function i(){this._events=new n,this._eventsCount=0}Object.create&&(n.prototype=Object.create(null),(new n).__proto__||(t=!1)),i.prototype.eventNames=function(){var n,r,o=[];if(0===this._eventsCount)return o;for(r in n=this._events)e.call(n,r)&&o.push(t?r.slice(1):r);return Object.getOwnPropertySymbols?o.concat(Object.getOwnPropertySymbols(n)):o},i.prototype.listeners=function(e){var n=t?t+e:e,r=this._events[n];if(!r)return[];if(r.fn)return[r.fn];for(var o=0,s=r.length,i=new Array(s);o<s;o++)i[o]=r[o].fn;return i},i.prototype.listenerCount=function(e){var n=t?t+e:e,r=this._events[n];return r?r.fn?1:r.length:0},i.prototype.emit=function(e,n,r,o,s,i){var c=t?t+e:e;if(!this._events[c])return!1;var f,u,a=this._events[c],l=arguments.length;if(a.fn){switch(a.once&&this.removeListener(e,a.fn,void 0,!0),l){case 1:return a.fn.call(a.context),!0;case 2:return a.fn.call(a.context,n),!0;case 3:return a.fn.call(a.context,n,r),!0;case 4:return a.fn.call(a.context,n,r,o),!0;case 5:return a.fn.call(a.context,n,r,o,s),!0;case 6:return a.fn.call(a.context,n,r,o,s,i),!0}for(u=1,f=new Array(l-1);u<l;u++)f[u-1]=arguments[u];a.fn.apply(a.context,f)}else{var v,h=a.length;for(u=0;u<h;u++)switch(a[u].once&&this.removeListener(e,a[u].fn,void 0,!0),l){case 1:a[u].fn.call(a[u].context);break;case 2:a[u].fn.call(a[u].context,n);break;case 3:a[u].fn.call(a[u].context,n,r);break;case 4:a[u].fn.call(a[u].context,n,r,o);break;default:if(!f)for(v=1,f=new Array(l-1);v<l;v++)f[v-1]=arguments[v];a[u].fn.apply(a[u].context,f)}}return!0},i.prototype.on=function(e,t,n){return o(this,e,t,n,!1)},i.prototype.once=function(e,t,n){return o(this,e,t,n,!0)},i.prototype.removeListener=function(e,n,r,o){var i=t?t+e:e;if(!this._events[i])return this;if(!n)return s(this,i),this;var c=this._events[i];if(c.fn)c.fn!==n||o&&!c.once||r&&c.context!==r||s(this,i);else{for(var f=0,u=[],a=c.length;f<a;f++)(c[f].fn!==n||o&&!c[f].once||r&&c[f].context!==r)&&u.push(c[f]);u.length?this._events[i]=1===u.length?u[0]:u:s(this,i)}return this},i.prototype.removeAllListeners=function(e){var r;return e?(r=t?t+e:e,this._events[r]&&s(this,r)):(this._events=new n,this._eventsCount=0),this},i.prototype.off=i.prototype.removeListener,i.prototype.addListener=i.prototype.on,i.prefixed=t,i.EventEmitter=i,"undefined"!=typeof module&&(module.exports=i);
--},{}],"WOs9":[function(require,module,exports) {
--"use strict";var r=this&&this.__read||function(r,e){var o="function"==typeof Symbol&&r[Symbol.iterator];if(!o)return r;var t,n,l=o.call(r),i=[];try{for(;(void 0===e||e-- >0)&&!(t=l.next()).done;)i.push(t.value)}catch(s){n={error:s}}finally{try{t&&!t.done&&(o=l.return)&&o.call(l)}finally{if(n)throw n.error}}return i},e=this&&this.__spreadArray||function(r,e){for(var o=0,t=e.length,n=r.length;o<t;o++,n++)r[n]=e[o];return r};Object.defineProperty(exports,"__esModule",{value:!0}),exports.LogLevel=void 0;var o,t="PeerJS: ";!function(r){r[r.Disabled=0]="Disabled",r[r.Errors=1]="Errors",r[r.Warnings=2]="Warnings",r[r.All=3]="All"}(o=exports.LogLevel||(exports.LogLevel={}));var n=function(){function n(){this._logLevel=o.Disabled}return Object.defineProperty(n.prototype,"logLevel",{get:function(){return this._logLevel},set:function(r){this._logLevel=r},enumerable:!1,configurable:!0}),n.prototype.log=function(){for(var t=[],n=0;n<arguments.length;n++)t[n]=arguments[n];this._logLevel>=o.All&&this._print.apply(this,e([o.All],r(t)))},n.prototype.warn=function(){for(var t=[],n=0;n<arguments.length;n++)t[n]=arguments[n];this._logLevel>=o.Warnings&&this._print.apply(this,e([o.Warnings],r(t)))},n.prototype.error=function(){for(var t=[],n=0;n<arguments.length;n++)t[n]=arguments[n];this._logLevel>=o.Errors&&this._print.apply(this,e([o.Errors],r(t)))},n.prototype.setLogFunction=function(r){this._print=r},n.prototype._print=function(n){for(var l=[],i=1;i<arguments.length;i++)l[i-1]=arguments[i];var s=e([t],r(l));for(var a in s)s[a]instanceof Error&&(s[a]="("+s[a].name+") "+s[a].message);n>=o.All?console.log.apply(console,e([],r(s))):n>=o.Warnings?console.warn.apply(console,e(["WARNING"],r(s))):n>=o.Errors&&console.error.apply(console,e(["ERROR"],r(s)))},n}();exports.default=new n;
--},{}],"ZRYf":[function(require,module,exports) {
--"use strict";var e,r,o,n,t,a,i;Object.defineProperty(exports,"__esModule",{value:!0}),exports.ServerMessageType=exports.SocketEventType=exports.SerializationType=exports.PeerErrorType=exports.PeerEventType=exports.ConnectionType=exports.ConnectionEventType=void 0,function(e){e.Open="open",e.Stream="stream",e.Data="data",e.Close="close",e.Error="error",e.IceStateChanged="iceStateChanged"}(e=exports.ConnectionEventType||(exports.ConnectionEventType={})),function(e){e.Data="data",e.Media="media"}(r=exports.ConnectionType||(exports.ConnectionType={})),function(e){e.Open="open",e.Close="close",e.Connection="connection",e.Call="call",e.Disconnected="disconnected",e.Error="error"}(o=exports.PeerEventType||(exports.PeerEventType={})),function(e){e.BrowserIncompatible="browser-incompatible",e.Disconnected="disconnected",e.InvalidID="invalid-id",e.InvalidKey="invalid-key",e.Network="network",e.PeerUnavailable="peer-unavailable",e.SslUnavailable="ssl-unavailable",e.ServerError="server-error",e.SocketError="socket-error",e.SocketClosed="socket-closed",e.UnavailableID="unavailable-id",e.WebRTC="webrtc"}(n=exports.PeerErrorType||(exports.PeerErrorType={})),function(e){e.Binary="binary",e.BinaryUTF8="binary-utf8",e.JSON="json"}(t=exports.SerializationType||(exports.SerializationType={})),function(e){e.Message="message",e.Disconnected="disconnected",e.Error="error",e.Close="close"}(a=exports.SocketEventType||(exports.SocketEventType={})),function(e){e.Heartbeat="HEARTBEAT",e.Candidate="CANDIDATE",e.Offer="OFFER",e.Answer="ANSWER",e.Open="OPEN",e.Error="ERROR",e.IdTaken="ID-TAKEN",e.InvalidKey="INVALID-KEY",e.Leave="LEAVE",e.Expire="EXPIRE"}(i=exports.ServerMessageType||(exports.ServerMessageType={}));
--},{}],"wJlv":[function(require,module,exports) {
--"use strict";var e=this&&this.__extends||function(){var e=function(t,n){return(e=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(e,t){e.__proto__=t}||function(e,t){for(var n in t)Object.prototype.hasOwnProperty.call(t,n)&&(e[n]=t[n])})(t,n)};return function(t,n){if("function"!=typeof n&&null!==n)throw new TypeError("Class extends value "+String(n)+" is not a constructor or null");function o(){this.constructor=t}e(t,n),t.prototype=null===n?Object.create(n):(o.prototype=n.prototype,new o)}}(),t=this&&this.__read||function(e,t){var n="function"==typeof Symbol&&e[Symbol.iterator];if(!n)return e;var o,s,r=n.call(e),i=[];try{for(;(void 0===t||t-- >0)&&!(o=r.next()).done;)i.push(o.value)}catch(c){s={error:c}}finally{try{o&&!o.done&&(n=r.return)&&n.call(r)}finally{if(s)throw s.error}}return i},n=this&&this.__spreadArray||function(e,t){for(var n=0,o=t.length,s=e.length;n<o;n++,s++)e[s]=t[n];return e},o=this&&this.__values||function(e){var t="function"==typeof Symbol&&Symbol.iterator,n=t&&e[t],o=0;if(n)return n.call(e);if(e&&"number"==typeof e.length)return{next:function(){return e&&o>=e.length&&(e=void 0),{value:e&&e[o++],done:!e}}};throw new TypeError(t?"Object is not iterable.":"Symbol.iterator is not defined.")},s=this&&this.__importDefault||function(e){return e&&e.__esModule?e:{default:e}};Object.defineProperty(exports,"__esModule",{value:!0}),exports.Socket=void 0;var r=require("eventemitter3"),i=s(require("./logger")),c=require("./enums"),a=function(s){function r(e,t,n,o,r,i){void 0===i&&(i=5e3);var c=s.call(this)||this;c.pingInterval=i,c._disconnected=!0,c._messagesQueue=[];var a=e?"wss://":"ws://";return c._baseUrl=a+t+":"+n+o+"peerjs?key="+r,c}return e(r,s),r.prototype.start=function(e,t){var n=this;this._id=e;var o=this._baseUrl+"&id="+e+"&token="+t;!this._socket&&this._disconnected&&(this._socket=new WebSocket(o),this._disconnected=!1,this._socket.onmessage=function(e){var t;try{t=JSON.parse(e.data),i.default.log("Server message received:",t)}catch(o){return void i.default.log("Invalid server message",e.data)}n.emit(c.SocketEventType.Message,t)},this._socket.onclose=function(e){n._disconnected||(i.default.log("Socket closed.",e),n._cleanup(),n._disconnected=!0,n.emit(c.SocketEventType.Disconnected))},this._socket.onopen=function(){n._disconnected||(n._sendQueuedMessages(),i.default.log("Socket open"),n._scheduleHeartbeat())})},r.prototype._scheduleHeartbeat=function(){var e=this;this._wsPingTimer=setTimeout(function(){e._sendHeartbeat()},this.pingInterval)},r.prototype._sendHeartbeat=function(){if(this._wsOpen()){var e=JSON.stringify({type:c.ServerMessageType.Heartbeat});this._socket.send(e),this._scheduleHeartbeat()}else i.default.log("Cannot send heartbeat, because socket closed")},r.prototype._wsOpen=function(){return!!this._socket&&1===this._socket.readyState},r.prototype._sendQueuedMessages=function(){var e,s,r=n([],t(this._messagesQueue));this._messagesQueue=[];try{for(var i=o(r),c=i.next();!c.done;c=i.next()){var a=c.value;this.send(a)}}catch(u){e={error:u}}finally{try{c&&!c.done&&(s=i.return)&&s.call(i)}finally{if(e)throw e.error}}},r.prototype.send=function(e){if(!this._disconnected)if(this._id)if(e.type){if(this._wsOpen()){var t=JSON.stringify(e);this._socket.send(t)}}else this.emit(c.SocketEventType.Error,"Invalid message");else this._messagesQueue.push(e)},r.prototype.close=function(){this._disconnected||(this._cleanup(),this._disconnected=!0)},r.prototype._cleanup=function(){this._socket&&(this._socket.onopen=this._socket.onmessage=this._socket.onclose=null,this._socket.close(),this._socket=void 0),clearTimeout(this._wsPingTimer)},r}(r.EventEmitter);exports.Socket=a;
--},{"eventemitter3":"JJlS","./logger":"WOs9","./enums":"ZRYf"}],"HCdX":[function(require,module,exports) {
--"use strict";var e=this&&this.__assign||function(){return(e=Object.assign||function(e){for(var n,t=1,o=arguments.length;t<o;t++)for(var i in n=arguments[t])Object.prototype.hasOwnProperty.call(n,i)&&(e[i]=n[i]);return e}).apply(this,arguments)},n=this&&this.__awaiter||function(e,n,t,o){return new(t||(t=Promise))(function(i,r){function c(e){try{s(o.next(e))}catch(n){r(n)}}function a(e){try{s(o.throw(e))}catch(n){r(n)}}function s(e){var n;e.done?i(e.value):(n=e.value,n instanceof t?n:new t(function(e){e(n)})).then(c,a)}s((o=o.apply(e,n||[])).next())})},t=this&&this.__generator||function(e,n){var t,o,i,r,c={label:0,sent:function(){if(1&i[0])throw i[1];return i[1]},trys:[],ops:[]};return r={next:a(0),throw:a(1),return:a(2)},"function"==typeof Symbol&&(r[Symbol.iterator]=function(){return this}),r;function a(r){return function(a){return function(r){if(t)throw new TypeError("Generator is already 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o(e){this.connection=e}return o.prototype.startConnection=function(e){var n=this._startPeerConnection();if(this.connection.peerConnection=n,this.connection.type===c.ConnectionType.Media&&e._stream&&this._addTracksToConnection(e._stream,n),e.originator){if(this.connection.type===c.ConnectionType.Data){var t=this.connection,o={ordered:!!e.reliable},i=n.createDataChannel(t.label,o);t.initialize(i)}this._makeOffer()}else this.handleSDP("OFFER",e.sdp)},o.prototype._startPeerConnection=function(){r.default.log("Creating RTCPeerConnection.");var e=new RTCPeerConnection(this.connection.provider.options.config);return this._setupListeners(e),e},o.prototype._setupListeners=function(e){var n=this,t=this.connection.peer,o=this.connection.connectionId,a=this.connection.type,s=this.connection.provider;r.default.log("Listening for ICE candidates."),e.onicecandidate=function(e){e.candidate&&e.candidate.candidate&&(r.default.log("Received ICE candidates for "+t+":",e.candidate),s.socket.send({type:c.ServerMessageType.Candidate,payload:{candidate:e.candidate,type:a,connectionId:o},dst:t}))},e.oniceconnectionstatechange=function(){switch(e.iceConnectionState){case"failed":r.default.log("iceConnectionState is failed, closing connections to "+t),n.connection.emit(c.ConnectionEventType.Error,new Error("Negotiation of connection to "+t+" failed.")),n.connection.close();break;case"closed":r.default.log("iceConnectionState is closed, closing connections to "+t),n.connection.emit(c.ConnectionEventType.Error,new Error("Connection to "+t+" closed.")),n.connection.close();break;case"disconnected":r.default.log("iceConnectionState changed to disconnected on the connection with "+t);break;case"completed":e.onicecandidate=i.util.noop}n.connection.emit(c.ConnectionEventType.IceStateChanged,e.iceConnectionState)},r.default.log("Listening for data channel"),e.ondatachannel=function(e){r.default.log("Received data channel");var n=e.channel;s.getConnection(t,o).initialize(n)},r.default.log("Listening for remote stream"),e.ontrack=function(e){r.default.log("Received remote stream");var i=e.streams[0],a=s.getConnection(t,o);if(a.type===c.ConnectionType.Media){var d=a;n._addStreamToMediaConnection(i,d)}}},o.prototype.cleanup=function(){r.default.log("Cleaning up PeerConnection to "+this.connection.peer);var e=this.connection.peerConnection;if(e){this.connection.peerConnection=null,e.onicecandidate=e.oniceconnectionstatechange=e.ondatachannel=e.ontrack=function(){};var n="closed"!==e.signalingState,t=!1;if(this.connection.type===c.ConnectionType.Data){var o=this.connection.dataChannel;o&&(t=!!o.readyState&&"closed"!==o.readyState)}(n||t)&&e.close()}},o.prototype._makeOffer=function(){return n(this,void 0,Promise,function(){var n,o,a,s,d,l,u;return t(this,function(t){switch(t.label){case 0:n=this.connection.peerConnection,o=this.connection.provider,t.label=1;case 1:return t.trys.push([1,7,,8]),[4,n.createOffer(this.connection.options.constraints)];case 2:a=t.sent(),r.default.log("Created offer."),this.connection.options.sdpTransform&&"function"==typeof this.connection.options.sdpTransform&&(a.sdp=this.connection.options.sdpTransform(a.sdp)||a.sdp),t.label=3;case 3:return t.trys.push([3,5,,6]),[4,n.setLocalDescription(a)];case 4:return t.sent(),r.default.log("Set localDescription:",a,"for:"+this.connection.peer),s={sdp:a,type:this.connection.type,connectionId:this.connection.connectionId,metadata:this.connection.metadata,browser:i.util.browser},this.connection.type===c.ConnectionType.Data&&(d=this.connection,s=e(e({},s),{label:d.label,reliable:d.reliable,serialization:d.serialization})),o.socket.send({type:c.ServerMessageType.Offer,payload:s,dst:this.connection.peer}),[3,6];case 5:return"OperationError: Failed to set local offer sdp: Called in wrong state: kHaveRemoteOffer"!=(l=t.sent())&&(o.emitError(c.PeerErrorType.WebRTC,l),r.default.log("Failed to setLocalDescription, ",l)),[3,6];case 6:return[3,8];case 7:return u=t.sent(),o.emitError(c.PeerErrorType.WebRTC,u),r.default.log("Failed to createOffer, ",u),[3,8];case 8:return[2]}})})},o.prototype._makeAnswer=function(){return n(this,void 0,Promise,function(){var e,n,o,a,s;return t(this,function(t){switch(t.label){case 0:e=this.connection.peerConnection,n=this.connection.provider,t.label=1;case 1:return t.trys.push([1,7,,8]),[4,e.createAnswer()];case 2:o=t.sent(),r.default.log("Created answer."),this.connection.options.sdpTransform&&"function"==typeof this.connection.options.sdpTransform&&(o.sdp=this.connection.options.sdpTransform(o.sdp)||o.sdp),t.label=3;case 3:return t.trys.push([3,5,,6]),[4,e.setLocalDescription(o)];case 4:return t.sent(),r.default.log("Set localDescription:",o,"for:"+this.connection.peer),n.socket.send({type:c.ServerMessageType.Answer,payload:{sdp:o,type:this.connection.type,connectionId:this.connection.connectionId,browser:i.util.browser},dst:this.connection.peer}),[3,6];case 5:return a=t.sent(),n.emitError(c.PeerErrorType.WebRTC,a),r.default.log("Failed to setLocalDescription, ",a),[3,6];case 6:return[3,8];case 7:return s=t.sent(),n.emitError(c.PeerErrorType.WebRTC,s),r.default.log("Failed to create answer, ",s),[3,8];case 8:return[2]}})})},o.prototype.handleSDP=function(e,o){return n(this,void 0,Promise,function(){var n,i,a,s;return t(this,function(t){switch(t.label){case 0:o=new RTCSessionDescription(o),n=this.connection.peerConnection,i=this.connection.provider,r.default.log("Setting remote description",o),a=this,t.label=1;case 1:return t.trys.push([1,5,,6]),[4,n.setRemoteDescription(o)];case 2:return t.sent(),r.default.log("Set remoteDescription:"+e+" for:"+this.connection.peer),"OFFER"!==e?[3,4]:[4,a._makeAnswer()];case 3:t.sent(),t.label=4;case 4:return[3,6];case 5:return s=t.sent(),i.emitError(c.PeerErrorType.WebRTC,s),r.default.log("Failed to setRemoteDescription, ",s),[3,6];case 6:return[2]}})})},o.prototype.handleCandidate=function(e){return n(this,void 0,Promise,function(){var n,o,i,a,s,d;return t(this,function(t){switch(t.label){case 0:r.default.log("handleCandidate:",e),n=e.candidate,o=e.sdpMLineIndex,i=e.sdpMid,a=this.connection.peerConnection,s=this.connection.provider,t.label=1;case 1:return t.trys.push([1,3,,4]),[4,a.addIceCandidate(new RTCIceCandidate({sdpMid:i,sdpMLineIndex:o,candidate:n}))];case 2:return t.sent(),r.default.log("Added ICE candidate for:"+this.connection.peer),[3,4];case 3:return d=t.sent(),s.emitError(c.PeerErrorType.WebRTC,d),r.default.log("Failed to handleCandidate, ",d),[3,4];case 4:return[2]}})})},o.prototype._addTracksToConnection=function(e,n){if(r.default.log("add tracks from stream "+e.id+" to peer connection"),!n.addTrack)return r.default.error("Your browser does't support RTCPeerConnection#addTrack. Ignored.");e.getTracks().forEach(function(t){n.addTrack(t,e)})},o.prototype._addStreamToMediaConnection=function(e,n){r.default.log("add stream "+e.id+" to media connection "+n.connectionId),n.addStream(e)},o}();exports.Negotiator=a;
--},{"./util":"BHXf","./logger":"WOs9","./enums":"ZRYf"}],"tQFK":[function(require,module,exports) {
--"use strict";var t=this&&this.__extends||function(){var t=function(e,n){return(t=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(t,e){t.__proto__=e}||function(t,e){for(var n in e)Object.prototype.hasOwnProperty.call(e,n)&&(t[n]=e[n])})(e,n)};return function(e,n){if("function"!=typeof n&&null!==n)throw new TypeError("Class extends value "+String(n)+" is not a constructor or null");function o(){this.constructor=e}t(e,n),e.prototype=null===n?Object.create(n):(o.prototype=n.prototype,new o)}}();Object.defineProperty(exports,"__esModule",{value:!0}),exports.BaseConnection=void 0;var e=require("eventemitter3"),n=function(e){function n(t,n,o){var r=e.call(this)||this;return r.peer=t,r.provider=n,r.options=o,r._open=!1,r.metadata=o.metadata,r}return t(n,e),Object.defineProperty(n.prototype,"open",{get:function(){return this._open},enumerable:!1,configurable:!0}),n}(e.EventEmitter);exports.BaseConnection=n;
--},{"eventemitter3":"JJlS"}],"dbHP":[function(require,module,exports) {
--"use strict";var e=this&&this.__extends||function(){var e=function(t,o){return(e=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(e,t){e.__proto__=t}||function(e,t){for(var o in t)Object.prototype.hasOwnProperty.call(t,o)&&(e[o]=t[o])})(t,o)};return function(t,o){if("function"!=typeof o&&null!==o)throw new TypeError("Class extends value "+String(o)+" is not a constructor or null");function r(){this.constructor=t}e(t,o),t.prototype=null===o?Object.create(o):(r.prototype=o.prototype,new r)}}(),t=this&&this.__assign||function(){return(t=Object.assign||function(e){for(var t,o=1,r=arguments.length;o<r;o++)for(var n in t=arguments[o])Object.prototype.hasOwnProperty.call(t,n)&&(e[n]=t[n]);return e}).apply(this,arguments)},o=this&&this.__values||function(e){var t="function"==typeof Symbol&&Symbol.iterator,o=t&&e[t],r=0;if(o)return o.call(e);if(e&&"number"==typeof e.length)return{next:function(){return e&&r>=e.length&&(e=void 0),{value:e&&e[r++],done:!e}}};throw new TypeError(t?"Object is not iterable.":"Symbol.iterator is not defined.")},r=this&&this.__importDefault||function(e){return e&&e.__esModule?e:{default:e}};Object.defineProperty(exports,"__esModule",{value:!0}),exports.MediaConnection=void 0;var n=require("./util"),i=r(require("./logger")),a=require("./negotiator"),s=require("./enums"),l=require("./baseconnection"),c=function(r){function l(e,t,o){var i=r.call(this,e,t,o)||this;return i._localStream=i.options._stream,i.connectionId=i.options.connectionId||l.ID_PREFIX+n.util.randomToken(),i._negotiator=new a.Negotiator(i),i._localStream&&i._negotiator.startConnection({_stream:i._localStream,originator:!0}),i}return e(l,r),Object.defineProperty(l.prototype,"type",{get:function(){return s.ConnectionType.Media},enumerable:!1,configurable:!0}),Object.defineProperty(l.prototype,"localStream",{get:function(){return this._localStream},enumerable:!1,configurable:!0}),Object.defineProperty(l.prototype,"remoteStream",{get:function(){return this._remoteStream},enumerable:!1,configurable:!0}),l.prototype.addStream=function(e){i.default.log("Receiving stream",e),this._remoteStream=e,r.prototype.emit.call(this,s.ConnectionEventType.Stream,e)},l.prototype.handleMessage=function(e){var t=e.type,o=e.payload;switch(e.type){case s.ServerMessageType.Answer:this._negotiator.handleSDP(t,o.sdp),this._open=!0;break;case s.ServerMessageType.Candidate:this._negotiator.handleCandidate(o.candidate);break;default:i.default.warn("Unrecognized message type:"+t+" from peer:"+this.peer)}},l.prototype.answer=function(e,r){var n,a;if(void 0===r&&(r={}),this._localStream)i.default.warn("Local stream already exists on this MediaConnection. Are you answering a call twice?");else{this._localStream=e,r&&r.sdpTransform&&(this.options.sdpTransform=r.sdpTransform),this._negotiator.startConnection(t(t({},this.options._payload),{_stream:e}));var s=this.provider._getMessages(this.connectionId);try{for(var l=o(s),c=l.next();!c.done;c=l.next()){var p=c.value;this.handleMessage(p)}}catch(u){n={error:u}}finally{try{c&&!c.done&&(a=l.return)&&a.call(l)}finally{if(n)throw n.error}}this._open=!0}},l.prototype.close=function(){this._negotiator&&(this._negotiator.cleanup(),this._negotiator=null),this._localStream=null,this._remoteStream=null,this.provider&&(this.provider._removeConnection(this),this.provider=null),this.options&&this.options._stream&&(this.options._stream=null),this.open&&(this._open=!1,r.prototype.emit.call(this,s.ConnectionEventType.Close))},l.ID_PREFIX="mc_",l}(l.BaseConnection);exports.MediaConnection=c;
--},{"./util":"BHXf","./logger":"WOs9","./negotiator":"HCdX","./enums":"ZRYf","./baseconnection":"tQFK"}],"GGp6":[function(require,module,exports) {
--"use strict";var e=this&&this.__extends||function(){var e=function(t,r){return(e=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(e,t){e.__proto__=t}||function(e,t){for(var r in t)Object.prototype.hasOwnProperty.call(t,r)&&(e[r]=t[r])})(t,r)};return function(t,r){if("function"!=typeof r&&null!==r)throw new TypeError("Class extends value "+String(r)+" is not a constructor or null");function o(){this.constructor=t}e(t,r),t.prototype=null===r?Object.create(r):(o.prototype=r.prototype,new o)}}(),t=this&&this.__importDefault||function(e){return e&&e.__esModule?e:{default:e}};Object.defineProperty(exports,"__esModule",{value:!0}),exports.EncodingQueue=void 0;var r=require("eventemitter3"),o=t(require("./logger")),n=function(t){function r(){var e=t.call(this)||this;return e.fileReader=new FileReader,e._queue=[],e._processing=!1,e.fileReader.onload=function(t){e._processing=!1,t.target&&e.emit("done",t.target.result),e.doNextTask()},e.fileReader.onerror=function(t){o.default.error("EncodingQueue error:",t),e._processing=!1,e.destroy(),e.emit("error",t)},e}return e(r,t),Object.defineProperty(r.prototype,"queue",{get:function(){return this._queue},enumerable:!1,configurable:!0}),Object.defineProperty(r.prototype,"size",{get:function(){return this.queue.length},enumerable:!1,configurable:!0}),Object.defineProperty(r.prototype,"processing",{get:function(){return this._processing},enumerable:!1,configurable:!0}),r.prototype.enque=function(e){this.queue.push(e),this.processing||this.doNextTask()},r.prototype.destroy=function(){this.fileReader.abort(),this._queue=[]},r.prototype.doNextTask=function(){0!==this.size&&(this.processing||(this._processing=!0,this.fileReader.readAsArrayBuffer(this.queue.shift())))},r}(r.EventEmitter);exports.EncodingQueue=n;
--},{"eventemitter3":"JJlS","./logger":"WOs9"}],"GBTQ":[function(require,module,exports) {
--"use strict";var e=this&&this.__extends||function(){var e=function(t,n){return(e=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(e,t){e.__proto__=t}||function(e,t){for(var n in t)Object.prototype.hasOwnProperty.call(t,n)&&(e[n]=t[n])})(t,n)};return function(t,n){if("function"!=typeof n&&null!==n)throw new TypeError("Class extends value "+String(n)+" is not a constructor or null");function i(){this.constructor=t}e(t,n),t.prototype=null===n?Object.create(n):(i.prototype=n.prototype,new i)}}(),t=this&&this.__values||function(e){var t="function"==typeof Symbol&&Symbol.iterator,n=t&&e[t],i=0;if(n)return n.call(e);if(e&&"number"==typeof e.length)return{next:function(){return e&&i>=e.length&&(e=void 0),{value:e&&e[i++],done:!e}}};throw new TypeError(t?"Object is not iterable.":"Symbol.iterator is not defined.")},n=this&&this.__importDefault||function(e){return e&&e.__esModule?e:{default:e}};Object.defineProperty(exports,"__esModule",{value:!0}),exports.DataConnection=void 0;var i=require("./util"),o=n(require("./logger")),r=require("./negotiator"),a=require("./enums"),s=require("./baseconnection"),u=require("./encodingQueue"),l=function(n){function s(e,t,l){var f=n.call(this,e,t,l)||this;return f.stringify=JSON.stringify,f.parse=JSON.parse,f._buffer=[],f._bufferSize=0,f._buffering=!1,f._chunkedData={},f._encodingQueue=new u.EncodingQueue,f.connectionId=f.options.connectionId||s.ID_PREFIX+i.util.randomToken(),f.label=f.options.label||f.connectionId,f.serialization=f.options.serialization||a.SerializationType.Binary,f.reliable=!!f.options.reliable,f._encodingQueue.on("done",function(e){f._bufferedSend(e)}),f._encodingQueue.on("error",function(){o.default.error("DC#"+f.connectionId+": Error occured in encoding from blob to arraybuffer, close DC"),f.close()}),f._negotiator=new r.Negotiator(f),f._negotiator.startConnection(f.options._payload||{originator:!0}),f}return e(s,n),Object.defineProperty(s.prototype,"type",{get:function(){return a.ConnectionType.Data},enumerable:!1,configurable:!0}),Object.defineProperty(s.prototype,"dataChannel",{get:function(){return this._dc},enumerable:!1,configurable:!0}),Object.defineProperty(s.prototype,"bufferSize",{get:function(){return this._bufferSize},enumerable:!1,configurable:!0}),s.prototype.initialize=function(e){this._dc=e,this._configureDataChannel()},s.prototype._configureDataChannel=function(){var e=this;i.util.supports.binaryBlob&&!i.util.supports.reliable||(this.dataChannel.binaryType="arraybuffer"),this.dataChannel.onopen=function(){o.default.log("DC#"+e.connectionId+" dc connection success"),e._open=!0,e.emit(a.ConnectionEventType.Open)},this.dataChannel.onmessage=function(t){o.default.log("DC#"+e.connectionId+" dc onmessage:",t.data),e._handleDataMessage(t)},this.dataChannel.onclose=function(){o.default.log("DC#"+e.connectionId+" dc closed for:",e.peer),e.close()}},s.prototype._handleDataMessage=function(e){var t=this,o=e.data,r=o.constructor,s=o;if(this.serialization===a.SerializationType.Binary||this.serialization===a.SerializationType.BinaryUTF8){if(r===Blob)return void i.util.blobToArrayBuffer(o,function(e){var n=i.util.unpack(e);t.emit(a.ConnectionEventType.Data,n)});if(r===ArrayBuffer)s=i.util.unpack(o);else if(r===String){var u=i.util.binaryStringToArrayBuffer(o);s=i.util.unpack(u)}}else this.serialization===a.SerializationType.JSON&&(s=this.parse(o));s.__peerData?this._handleChunk(s):n.prototype.emit.call(this,a.ConnectionEventType.Data,s)},s.prototype._handleChunk=function(e){var t=e.__peerData,n=this._chunkedData[t]||{data:[],count:0,total:e.total};if(n.data[e.n]=e.data,n.count++,this._chunkedData[t]=n,n.total===n.count){delete this._chunkedData[t];var i=new Blob(n.data);this._handleDataMessage({data:i})}},s.prototype.close=function(){this._buffer=[],this._bufferSize=0,this._chunkedData={},this._negotiator&&(this._negotiator.cleanup(),this._negotiator=null),this.provider&&(this.provider._removeConnection(this),this.provider=null),this.dataChannel&&(this.dataChannel.onopen=null,this.dataChannel.onmessage=null,this.dataChannel.onclose=null,this._dc=null),this._encodingQueue&&(this._encodingQueue.destroy(),this._encodingQueue.removeAllListeners(),this._encodingQueue=null),this.open&&(this._open=!1,n.prototype.emit.call(this,a.ConnectionEventType.Close))},s.prototype.send=function(e,t){if(this.open)if(this.serialization===a.SerializationType.JSON)this._bufferedSend(this.stringify(e));else if(this.serialization===a.SerializationType.Binary||this.serialization===a.SerializationType.BinaryUTF8){var o=i.util.pack(e);if(!t&&o.size>i.util.chunkedMTU)return void this._sendChunks(o);i.util.supports.binaryBlob?this._bufferedSend(o):this._encodingQueue.enque(o)}else this._bufferedSend(e);else n.prototype.emit.call(this,a.ConnectionEventType.Error,new Error("Connection is not open. You should listen for the `open` event before sending messages."))},s.prototype._bufferedSend=function(e){!this._buffering&&this._trySend(e)||(this._buffer.push(e),this._bufferSize=this._buffer.length)},s.prototype._trySend=function(e){var t=this;if(!this.open)return!1;if(this.dataChannel.bufferedAmount>s.MAX_BUFFERED_AMOUNT)return this._buffering=!0,setTimeout(function(){t._buffering=!1,t._tryBuffer()},50),!1;try{this.dataChannel.send(e)}catch(n){return o.default.error("DC#:"+this.connectionId+" Error when sending:",n),this._buffering=!0,this.close(),!1}return!0},s.prototype._tryBuffer=function(){if(this.open&&0!==this._buffer.length){var e=this._buffer[0];this._trySend(e)&&(this._buffer.shift(),this._bufferSize=this._buffer.length,this._tryBuffer())}},s.prototype._sendChunks=function(e){var n,r,a=i.util.chunk(e);o.default.log("DC#"+this.connectionId+" Try to send "+a.length+" chunks...");try{for(var s=t(a),u=s.next();!u.done;u=s.next()){var l=u.value;this.send(l,!0)}}catch(f){n={error:f}}finally{try{u&&!u.done&&(r=s.return)&&r.call(s)}finally{if(n)throw n.error}}},s.prototype.handleMessage=function(e){var t=e.payload;switch(e.type){case a.ServerMessageType.Answer:this._negotiator.handleSDP(e.type,t.sdp);break;case a.ServerMessageType.Candidate:this._negotiator.handleCandidate(t.candidate);break;default:o.default.warn("Unrecognized message type:",e.type,"from peer:",this.peer)}},s.ID_PREFIX="dc_",s.MAX_BUFFERED_AMOUNT=8388608,s}(s.BaseConnection);exports.DataConnection=l;
--},{"./util":"BHXf","./logger":"WOs9","./negotiator":"HCdX","./enums":"ZRYf","./baseconnection":"tQFK","./encodingQueue":"GGp6"}],"in7L":[function(require,module,exports) {
--"use strict";var t=this&&this.__awaiter||function(t,e,r,o){return new(r||(r=Promise))(function(n,s){function i(t){try{a(o.next(t))}catch(e){s(e)}}function u(t){try{a(o.throw(t))}catch(e){s(e)}}function a(t){var e;t.done?n(t.value):(e=t.value,e instanceof r?e:new r(function(t){t(e)})).then(i,u)}a((o=o.apply(t,e||[])).next())})},e=this&&this.__generator||function(t,e){var r,o,n,s,i={label:0,sent:function(){if(1&n[0])throw n[1];return n[1]},trys:[],ops:[]};return s={next:u(0),throw:u(1),return:u(2)},"function"==typeof Symbol&&(s[Symbol.iterator]=function(){return this}),s;function u(s){return function(u){return function(s){if(r)throw new TypeError("Generator is already executing.");for(;i;)try{if(r=1,o&&(n=2&s[0]?o.return:s[0]?o.throw||((n=o.return)&&n.call(o),0):o.next)&&!(n=n.call(o,s[1])).done)return n;switch(o=0,n&&(s=[2&s[0],n.value]),s[0]){case 0:case 1:n=s;break;case 4:return i.label++,{value:s[1],done:!1};case 5:i.label++,o=s[1],s=[0];continue;case 7:s=i.ops.pop(),i.trys.pop();continue;default:if(!(n=(n=i.trys).length>0&&n[n.length-1])&&(6===s[0]||2===s[0])){i=0;continue}if(3===s[0]&&(!n||s[1]>n[0]&&s[1]<n[3])){i.label=s[1];break}if(6===s[0]&&i.label<n[1]){i.label=n[1],n=s;break}if(n&&i.label<n[2]){i.label=n[2],i.ops.push(s);break}n[2]&&i.ops.pop(),i.trys.pop();continue}s=e.call(t,i)}catch(u){s=[6,u],o=0}finally{r=n=0}if(5&s[0])throw s[1];return{value:s[0]?s[1]:void 0,done:!0}}([s,u])}}},r=this&&this.__importDefault||function(t){return t&&t.__esModule?t:{default:t}};Object.defineProperty(exports,"__esModule",{value:!0}),exports.API=void 0;var o=require("./util"),n=r(require("./logger")),s=function(){function r(t){this._options=t}return r.prototype._buildUrl=function(t){var e=(this._options.secure?"https://":"http://")+this._options.host+":"+this._options.port+this._options.path+this._options.key+"/"+t;return e+="?ts="+(new Date).getTime()+Math.random()},r.prototype.retrieveId=function(){return t(this,void 0,Promise,function(){var t,r,s,i;return e(this,function(e){switch(e.label){case 0:t=this._buildUrl("id"),e.label=1;case 1:return e.trys.push([1,3,,4]),[4,fetch(t)];case 2:if(200!==(r=e.sent()).status)throw new Error("Error. Status:"+r.status);return[2,r.text()];case 3:throw s=e.sent(),n.default.error("Error retrieving ID",s),i="","/"===this._options.path&&this._options.host!==o.util.CLOUD_HOST&&(i=" If you passed in a `path` to your self-hosted PeerServer, you'll also need to pass in that same path when creating a new Peer."),new Error("Could not get an ID from the server."+i);case 4:return[2]}})})},r.prototype.listAllPeers=function(){return t(this,void 0,Promise,function(){var t,r,s,i;return e(this,function(e){switch(e.label){case 0:t=this._buildUrl("peers"),e.label=1;case 1:return e.trys.push([1,3,,4]),[4,fetch(t)];case 2:if(200!==(r=e.sent()).status){if(401===r.status)throw s="",s=this._options.host===o.util.CLOUD_HOST?"It looks like you're using the cloud server. You can email team@peerjs.com to enable peer listing for your API key.":"You need to enable `allow_discovery` on your self-hosted PeerServer to use this feature.",new Error("It doesn't look like you have permission to list peers IDs. "+s);throw new Error("Error. Status:"+r.status)}return[2,r.json()];case 3:throw i=e.sent(),n.default.error("Error retrieving list peers",i),new Error("Could not get list peers from the server."+i);case 4:return[2]}})})},r}();exports.API=s;
--},{"./util":"BHXf","./logger":"WOs9"}],"Hxpd":[function(require,module,exports) {
--"use strict";var e=this&&this.__extends||function(){var e=function(t,n){return(e=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(e,t){e.__proto__=t}||function(e,t){for(var n in t)Object.prototype.hasOwnProperty.call(t,n)&&(e[n]=t[n])})(t,n)};return function(t,n){if("function"!=typeof n&&null!==n)throw new TypeError("Class extends value "+String(n)+" is not a constructor or null");function r(){this.constructor=t}e(t,n),t.prototype=null===n?Object.create(n):(r.prototype=n.prototype,new r)}}(),t=this&&this.__assign||function(){return(t=Object.assign||function(e){for(var t,n=1,r=arguments.length;n<r;n++)for(var o in t=arguments[n])Object.prototype.hasOwnProperty.call(t,o)&&(e[o]=t[o]);return e}).apply(this,arguments)},n=this&&this.__values||function(e){var t="function"==typeof Symbol&&Symbol.iterator,n=t&&e[t],r=0;if(n)return n.call(e);if(e&&"number"==typeof e.length)return{next:function(){return e&&r>=e.length&&(e=void 0),{value:e&&e[r++],done:!e}}};throw new TypeError(t?"Object is not iterable.":"Symbol.iterator is not defined.")},r=this&&this.__read||function(e,t){var n="function"==typeof Symbol&&e[Symbol.iterator];if(!n)return e;var r,o,i=n.call(e),s=[];try{for(;(void 0===t||t-- >0)&&!(r=i.next()).done;)s.push(r.value)}catch(a){o={error:a}}finally{try{r&&!r.done&&(n=i.return)&&n.call(i)}finally{if(o)throw o.error}}return s},o=this&&this.__importDefault||function(e){return e&&e.__esModule?e:{default:e}};Object.defineProperty(exports,"__esModule",{value:!0}),exports.Peer=void 0;var i=require("eventemitter3"),s=require("./util"),a=o(require("./logger")),c=require("./socket"),l=require("./mediaconnection"),u=require("./dataconnection"),d=require("./enums"),p=require("./api"),h=function(){return function(){}}(),f=function(o){function i(e,n){var r,c=o.call(this)||this;return c._id=null,c._lastServerId=null,c._destroyed=!1,c._disconnected=!1,c._open=!1,c._connections=new Map,c._lostMessages=new Map,e&&e.constructor==Object?n=e:e&&(r=e.toString()),n=t({debug:0,host:s.util.CLOUD_HOST,port:s.util.CLOUD_PORT,path:"/",key:i.DEFAULT_KEY,token:s.util.randomToken(),config:s.util.defaultConfig},n),c._options=n,"/"===c._options.host&&(c._options.host=window.location.hostname),c._options.path&&("/"!==c._options.path[0]&&(c._options.path="/"+c._options.path),"/"!==c._options.path[c._options.path.length-1]&&(c._options.path+="/")),void 0===c._options.secure&&c._options.host!==s.util.CLOUD_HOST?c._options.secure=s.util.isSecure():c._options.host==s.util.CLOUD_HOST&&(c._options.secure=!0),c._options.logFunction&&a.default.setLogFunction(c._options.logFunction),a.default.logLevel=c._options.debug||0,c._api=new p.API(n),c._socket=c._createServerConnection(),s.util.supports.audioVideo||s.util.supports.data?r&&!s.util.validateId(r)?(c._delayedAbort(d.PeerErrorType.InvalidID,'ID "'+r+'" is invalid'),c):(r?c._initialize(r):c._api.retrieveId().then(function(e){return c._initialize(e)}).catch(function(e){return c._abort(d.PeerErrorType.ServerError,e)}),c):(c._delayedAbort(d.PeerErrorType.BrowserIncompatible,"The current browser does not support WebRTC"),c)}return e(i,o),Object.defineProperty(i.prototype,"id",{get:function(){return this._id},enumerable:!1,configurable:!0}),Object.defineProperty(i.prototype,"options",{get:function(){return this._options},enumerable:!1,configurable:!0}),Object.defineProperty(i.prototype,"open",{get:function(){return this._open},enumerable:!1,configurable:!0}),Object.defineProperty(i.prototype,"socket",{get:function(){return this._socket},enumerable:!1,configurable:!0}),Object.defineProperty(i.prototype,"connections",{get:function(){var e,t,o=Object.create(null);try{for(var i=n(this._connections),s=i.next();!s.done;s=i.next()){var a=r(s.value,2),c=a[0],l=a[1];o[c]=l}}catch(u){e={error:u}}finally{try{s&&!s.done&&(t=i.return)&&t.call(i)}finally{if(e)throw e.error}}return o},enumerable:!1,configurable:!0}),Object.defineProperty(i.prototype,"destroyed",{get:function(){return this._destroyed},enumerable:!1,configurable:!0}),Object.defineProperty(i.prototype,"disconnected",{get:function(){return this._disconnected},enumerable:!1,configurable:!0}),i.prototype._createServerConnection=function(){var e=this,t=new c.Socket(this._options.secure,this._options.host,this._options.port,this._options.path,this._options.key,this._options.pingInterval);return t.on(d.SocketEventType.Message,function(t){e._handleMessage(t)}),t.on(d.SocketEventType.Error,function(t){e._abort(d.PeerErrorType.SocketError,t)}),t.on(d.SocketEventType.Disconnected,function(){e.disconnected||(e.emitError(d.PeerErrorType.Network,"Lost connection to server."),e.disconnect())}),t.on(d.SocketEventType.Close,function(){e.disconnected||e._abort(d.PeerErrorType.SocketClosed,"Underlying socket is already closed.")}),t},i.prototype._initialize=function(e){this._id=e,this.socket.start(e,this._options.token)},i.prototype._handleMessage=function(e){var t,r,o=e.type,i=e.payload,s=e.src;switch(o){case d.ServerMessageType.Open:this._lastServerId=this.id,this._open=!0,this.emit(d.PeerEventType.Open,this.id);break;case d.ServerMessageType.Error:this._abort(d.PeerErrorType.ServerError,i.msg);break;case d.ServerMessageType.IdTaken:this._abort(d.PeerErrorType.UnavailableID,'ID "'+this.id+'" is taken');break;case d.ServerMessageType.InvalidKey:this._abort(d.PeerErrorType.InvalidKey,'API KEY "'+this._options.key+'" is invalid');break;case d.ServerMessageType.Leave:a.default.log("Received leave message from "+s),this._cleanupPeer(s),this._connections.delete(s);break;case d.ServerMessageType.Expire:this.emitError(d.PeerErrorType.PeerUnavailable,"Could not connect to peer "+s);break;case d.ServerMessageType.Offer:var c=i.connectionId;if((_=this.getConnection(s,c))&&(_.close(),a.default.warn("Offer received for existing Connection ID:"+c)),i.type===d.ConnectionType.Media)_=new l.MediaConnection(s,this,{connectionId:c,_payload:i,metadata:i.metadata}),this._addConnection(s,_),this.emit(d.PeerEventType.Call,_);else{if(i.type!==d.ConnectionType.Data)return void a.default.warn("Received malformed connection type:"+i.type);_=new u.DataConnection(s,this,{connectionId:c,_payload:i,metadata:i.metadata,label:i.label,serialization:i.serialization,reliable:i.reliable}),this._addConnection(s,_),this.emit(d.PeerEventType.Connection,_)}var p=this._getMessages(c);try{for(var h=n(p),f=h.next();!f.done;f=h.next()){var y=f.value;_.handleMessage(y)}}catch(v){t={error:v}}finally{try{f&&!f.done&&(r=h.return)&&r.call(h)}finally{if(t)throw t.error}}break;default:if(!i)return void a.default.warn("You received a malformed message from "+s+" of type "+o);var _;c=i.connectionId;(_=this.getConnection(s,c))&&_.peerConnection?_.handleMessage(e):c?this._storeMessage(c,e):a.default.warn("You received an unrecognized message:",e)}},i.prototype._storeMessage=function(e,t){this._lostMessages.has(e)||this._lostMessages.set(e,[]),this._lostMessages.get(e).push(t)},i.prototype._getMessages=function(e){var t=this._lostMessages.get(e);return t?(this._lostMessages.delete(e),t):[]},i.prototype.connect=function(e,t){if(void 0===t&&(t={}),this.disconnected)return a.default.warn("You cannot connect to a new Peer because you called .disconnect() on this Peer and ended your connection with the server. You can create a new Peer to reconnect, or call reconnect on this peer if you believe its ID to still be available."),void this.emitError(d.PeerErrorType.Disconnected,"Cannot connect to new Peer after disconnecting from server.");var n=new u.DataConnection(e,this,t);return this._addConnection(e,n),n},i.prototype.call=function(e,t,n){if(void 0===n&&(n={}),this.disconnected)return a.default.warn("You cannot connect to a new Peer because you called .disconnect() on this Peer and ended your connection with the server. You can create a new Peer to reconnect."),void this.emitError(d.PeerErrorType.Disconnected,"Cannot connect to new Peer after disconnecting from server.");if(t){n._stream=t;var r=new l.MediaConnection(e,this,n);return this._addConnection(e,r),r}a.default.error("To call a peer, you must provide a stream from your browser's `getUserMedia`.")},i.prototype._addConnection=function(e,t){a.default.log("add connection "+t.type+":"+t.connectionId+" to peerId:"+e),this._connections.has(e)||this._connections.set(e,[]),this._connections.get(e).push(t)},i.prototype._removeConnection=function(e){var t=this._connections.get(e.peer);if(t){var n=t.indexOf(e);-1!==n&&t.splice(n,1)}this._lostMessages.delete(e.connectionId)},i.prototype.getConnection=function(e,t){var r,o,i=this._connections.get(e);if(!i)return null;try{for(var s=n(i),a=s.next();!a.done;a=s.next()){var c=a.value;if(c.connectionId===t)return c}}catch(l){r={error:l}}finally{try{a&&!a.done&&(o=s.return)&&o.call(s)}finally{if(r)throw r.error}}return null},i.prototype._delayedAbort=function(e,t){var n=this;setTimeout(function(){n._abort(e,t)},0)},i.prototype._abort=function(e,t){a.default.error("Aborting!"),this.emitError(e,t),this._lastServerId?this.disconnect():this.destroy()},i.prototype.emitError=function(e,t){var n;a.default.error("Error:",t),(n="string"==typeof t?new Error(t):t).type=e,this.emit(d.PeerEventType.Error,n)},i.prototype.destroy=function(){this.destroyed||(a.default.log("Destroy peer with ID:"+this.id),this.disconnect(),this._cleanup(),this._destroyed=!0,this.emit(d.PeerEventType.Close))},i.prototype._cleanup=function(){var e,t;try{for(var r=n(this._connections.keys()),o=r.next();!o.done;o=r.next()){var i=o.value;this._cleanupPeer(i),this._connections.delete(i)}}catch(s){e={error:s}}finally{try{o&&!o.done&&(t=r.return)&&t.call(r)}finally{if(e)throw e.error}}this.socket.removeAllListeners()},i.prototype._cleanupPeer=function(e){var t,r,o=this._connections.get(e);if(o)try{for(var i=n(o),s=i.next();!s.done;s=i.next()){s.value.close()}}catch(a){t={error:a}}finally{try{s&&!s.done&&(r=i.return)&&r.call(i)}finally{if(t)throw t.error}}},i.prototype.disconnect=function(){if(!this.disconnected){var e=this.id;a.default.log("Disconnect peer with ID:"+e),this._disconnected=!0,this._open=!1,this.socket.close(),this._lastServerId=e,this._id=null,this.emit(d.PeerEventType.Disconnected,e)}},i.prototype.reconnect=function(){if(this.disconnected&&!this.destroyed)a.default.log("Attempting reconnection to server with ID "+this._lastServerId),this._disconnected=!1,this._initialize(this._lastServerId);else{if(this.destroyed)throw new Error("This peer cannot reconnect to the server. It has already been destroyed.");if(this.disconnected||this.open)throw new Error("Peer "+this.id+" cannot reconnect because it is not disconnected from the server!");a.default.error("In a hurry? We're still trying to make the initial connection!")}},i.prototype.listAllPeers=function(e){var t=this;void 0===e&&(e=function(e){}),this._api.listAllPeers().then(function(t){return e(t)}).catch(function(e){return t._abort(d.PeerErrorType.ServerError,e)})},i.DEFAULT_KEY="peerjs",i}(i.EventEmitter);exports.Peer=f;
--},{"eventemitter3":"JJlS","./util":"BHXf","./logger":"WOs9","./socket":"wJlv","./mediaconnection":"dbHP","./dataconnection":"GBTQ","./enums":"ZRYf","./api":"in7L"}],"iTK6":[function(require,module,exports) {
--"use strict";Object.defineProperty(exports,"__esModule",{value:!0}),exports.peerjs=void 0;var e=require("./util"),r=require("./peer");exports.peerjs={Peer:r.Peer,util:e.util},exports.default=r.Peer,window.peerjs=exports.peerjs,window.Peer=r.Peer;
--},{"./util":"BHXf","./peer":"Hxpd"}]},{},["iTK6"], null)
--//# sourceMappingURL=/peerjs.min.js.map
-\ No newline at end of file
-+"use strict";
-+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
-+    if (k2 === undefined) k2 = k;
-+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
-+}) : (function(o, m, k, k2) {
-+    if (k2 === undefined) k2 = k;
-+    o[k2] = m[k];
-+}));
-+var __exportStar = (this && this.__exportStar) || function(m, exports) {
-+    for (var p in m) if (p !== "default" && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+__exportStar(require("./index"), exports);
-diff --git a/node_modules/peerjs/dist/peerjs.min.js.map b/node_modules/peerjs/dist/peerjs.min.js.map
-deleted file mode 100644
-index 14c2560..0000000
---- a/node_modules/peerjs/dist/peerjs.min.js.map
-+++ /dev/null
-@@ -1 +0,0 @@
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binaryFeatures = {};\r\nbinaryFeatures.useBlobBuilder = (function () {\r\n  try {\r\n    new Blob([]);\r\n    return false;\r\n  } catch (e) {\r\n    return true;\r\n  }\r\n})();\r\n\r\nbinaryFeatures.useArrayBufferView = !binaryFeatures.useBlobBuilder && (function () {\r\n  try {\r\n    return (new Blob([new Uint8Array([])])).size === 0;\r\n  } catch (e) {\r\n    return true;\r\n  }\r\n})();\r\n\r\nmodule.exports.binaryFeatures = binaryFeatures;\r\nvar BlobBuilder = module.exports.BlobBuilder;\r\nif (typeof window !== 'undefined') {\r\n  BlobBuilder = module.exports.BlobBuilder = window.WebKitBlobBuilder ||\r\n    window.MozBlobBuilder || window.MSBlobBuilder || window.BlobBuilder;\r\n}\r\n\r\nfunction BufferBuilder () {\r\n  this._pieces = [];\r\n  this._parts = [];\r\n}\r\n\r\nBufferBuilder.prototype.append = function (data) {\r\n  if (typeof data === 'number') {\r\n    this._pieces.push(data);\r\n  } else {\r\n    this.flush();\r\n    this._parts.push(data);\r\n  }\r\n};\r\n\r\nBufferBuilder.prototype.flush = function () {\r\n  if (this._pieces.length > 0) {\r\n    var buf = new Uint8Array(this._pieces);\r\n    if (!binaryFeatures.useArrayBufferView) {\r\n      buf = buf.buffer;\r\n    }\r\n    this._parts.push(buf);\r\n    this._pieces = [];\r\n  }\r\n};\r\n\r\nBufferBuilder.prototype.getBuffer = function () {\r\n  this.flush();\r\n  if (binaryFeatures.useBlobBuilder) {\r\n    var builder = new BlobBuilder();\r\n    for (var i = 0, ii = this._parts.length; i < ii; i++) {\r\n      builder.append(this._parts[i]);\r\n    }\r\n    return builder.getBlob();\r\n  } else {\r\n    return new Blob(this._parts);\r\n  }\r\n};\r\n\r\nmodule.exports.BufferBuilder = BufferBuilder;\r\n","var BufferBuilder = require('./bufferbuilder').BufferBuilder;\r\nvar binaryFeatures = require('./bufferbuilder').binaryFeatures;\r\n\r\nvar BinaryPack = {\r\n  unpack: function (data) {\r\n    var unpacker = new Unpacker(data);\r\n    return unpacker.unpack();\r\n  },\r\n  pack: function (data) {\r\n    var packer = new Packer();\r\n    packer.pack(data);\r\n    var buffer = packer.getBuffer();\r\n    return buffer;\r\n  }\r\n};\r\n\r\nmodule.exports = BinaryPack;\r\n\r\nfunction Unpacker (data) {\r\n  // Data is ArrayBuffer\r\n  this.index = 0;\r\n  this.dataBuffer = data;\r\n  this.dataView = new Uint8Array(this.dataBuffer);\r\n  this.length = this.dataBuffer.byteLength;\r\n}\r\n\r\nUnpacker.prototype.unpack = function () {\r\n  var type = this.unpack_uint8();\r\n  if (type < 0x80) {\r\n    return type;\r\n  } else if ((type ^ 0xe0) < 0x20) {\r\n    return (type ^ 0xe0) - 0x20;\r\n  }\r\n\r\n  var size;\r\n  if ((size = type ^ 0xa0) <= 0x0f) {\r\n    return this.unpack_raw(size);\r\n  } else if ((size = type ^ 0xb0) <= 0x0f) {\r\n    return this.unpack_string(size);\r\n  } else if ((size = type ^ 0x90) <= 0x0f) {\r\n    return this.unpack_array(size);\r\n  } else if ((size = type ^ 0x80) <= 0x0f) {\r\n    return this.unpack_map(size);\r\n  }\r\n\r\n  switch (type) {\r\n    case 0xc0:\r\n      return null;\r\n    case 0xc1:\r\n      return undefined;\r\n    case 0xc2:\r\n      return false;\r\n    case 0xc3:\r\n      return true;\r\n    case 0xca:\r\n      return this.unpack_float();\r\n    case 0xcb:\r\n      return this.unpack_double();\r\n    case 0xcc:\r\n      return this.unpack_uint8();\r\n    case 0xcd:\r\n      return this.unpack_uint16();\r\n    case 0xce:\r\n      return this.unpack_uint32();\r\n    case 0xcf:\r\n      return this.unpack_uint64();\r\n    case 0xd0:\r\n      return this.unpack_int8();\r\n    case 0xd1:\r\n      return this.unpack_int16();\r\n    case 0xd2:\r\n      return this.unpack_int32();\r\n    case 0xd3:\r\n      return this.unpack_int64();\r\n    case 0xd4:\r\n      return undefined;\r\n    case 0xd5:\r\n      return undefined;\r\n    case 0xd6:\r\n      return undefined;\r\n    case 0xd7:\r\n      return undefined;\r\n    case 0xd8:\r\n      size = this.unpack_uint16();\r\n      return this.unpack_string(size);\r\n    case 0xd9:\r\n      size = this.unpack_uint32();\r\n      return this.unpack_string(size);\r\n    case 0xda:\r\n      size = this.unpack_uint16();\r\n      return this.unpack_raw(size);\r\n    case 0xdb:\r\n      size = this.unpack_uint32();\r\n      return this.unpack_raw(size);\r\n    case 0xdc:\r\n      size = this.unpack_uint16();\r\n      return this.unpack_array(size);\r\n    case 0xdd:\r\n      size = this.unpack_uint32();\r\n      return this.unpack_array(size);\r\n    case 0xde:\r\n      size = this.unpack_uint16();\r\n      return this.unpack_map(size);\r\n    case 0xdf:\r\n      size = this.unpack_uint32();\r\n      return this.unpack_map(size);\r\n  }\r\n};\r\n\r\nUnpacker.prototype.unpack_uint8 = function () {\r\n  var byte = this.dataView[this.index] & 0xff;\r\n  this.index++;\r\n  return byte;\r\n};\r\n\r\nUnpacker.prototype.unpack_uint16 = function () {\r\n  var bytes = this.read(2);\r\n  var uint16 =\r\n    ((bytes[0] & 0xff) * 256) + (bytes[1] & 0xff);\r\n  this.index += 2;\r\n  return uint16;\r\n};\r\n\r\nUnpacker.prototype.unpack_uint32 = function () {\r\n  var bytes = this.read(4);\r\n  var uint32 =\r\n    ((bytes[0] * 256 +\r\n      bytes[1]) * 256 +\r\n      bytes[2]) * 256 +\r\n    bytes[3];\r\n  this.index += 4;\r\n  return uint32;\r\n};\r\n\r\nUnpacker.prototype.unpack_uint64 = function () {\r\n  var bytes = this.read(8);\r\n  var uint64 =\r\n    ((((((bytes[0] * 256 +\r\n      bytes[1]) * 256 +\r\n      bytes[2]) * 256 +\r\n      bytes[3]) * 256 +\r\n      bytes[4]) * 256 +\r\n      bytes[5]) * 256 +\r\n      bytes[6]) * 256 +\r\n    bytes[7];\r\n  this.index += 8;\r\n  return uint64;\r\n};\r\n\r\nUnpacker.prototype.unpack_int8 = function () {\r\n  var uint8 = this.unpack_uint8();\r\n  return (uint8 < 0x80) ? uint8 : uint8 - (1 << 8);\r\n};\r\n\r\nUnpacker.prototype.unpack_int16 = function () {\r\n  var uint16 = this.unpack_uint16();\r\n  return (uint16 < 0x8000) ? uint16 : uint16 - (1 << 16);\r\n};\r\n\r\nUnpacker.prototype.unpack_int32 = function () {\r\n  var uint32 = this.unpack_uint32();\r\n  return (uint32 < Math.pow(2, 31)) ? uint32\r\n    : uint32 - Math.pow(2, 32);\r\n};\r\n\r\nUnpacker.prototype.unpack_int64 = function () {\r\n  var uint64 = this.unpack_uint64();\r\n  return (uint64 < Math.pow(2, 63)) ? uint64\r\n    : uint64 - Math.pow(2, 64);\r\n};\r\n\r\nUnpacker.prototype.unpack_raw = function (size) {\r\n  if (this.length < this.index + size) {\r\n    throw new Error('BinaryPackFailure: index is out of range' +\r\n      ' ' + this.index + ' ' + size + ' ' + this.length);\r\n  }\r\n  var buf = this.dataBuffer.slice(this.index, this.index + size);\r\n  this.index += size;\r\n\r\n  // buf = util.bufferToString(buf);\r\n\r\n  return buf;\r\n};\r\n\r\nUnpacker.prototype.unpack_string = function (size) {\r\n  var bytes = this.read(size);\r\n  var i = 0;\r\n  var str = '';\r\n  var c;\r\n  var code;\r\n\r\n  while (i < size) {\r\n    c = bytes[i];\r\n    if (c < 128) {\r\n      str += String.fromCharCode(c);\r\n      i++;\r\n    } else if ((c ^ 0xc0) < 32) {\r\n      code = ((c ^ 0xc0) << 6) | (bytes[i + 1] & 63);\r\n      str += String.fromCharCode(code);\r\n      i += 2;\r\n    } else {\r\n      code = ((c & 15) << 12) | ((bytes[i + 1] & 63) << 6) |\r\n        (bytes[i + 2] & 63);\r\n      str += String.fromCharCode(code);\r\n      i += 3;\r\n    }\r\n  }\r\n\r\n  this.index += size;\r\n  return str;\r\n};\r\n\r\nUnpacker.prototype.unpack_array = function (size) {\r\n  var objects = new Array(size);\r\n  for (var i = 0; i < size; i++) {\r\n    objects[i] = this.unpack();\r\n  }\r\n  return objects;\r\n};\r\n\r\nUnpacker.prototype.unpack_map = function (size) {\r\n  var map = {};\r\n  for (var i = 0; i < size; i++) {\r\n    var key = this.unpack();\r\n    var value = this.unpack();\r\n    map[key] = value;\r\n  }\r\n  return map;\r\n};\r\n\r\nUnpacker.prototype.unpack_float = function () {\r\n  var uint32 = this.unpack_uint32();\r\n  var sign = uint32 >> 31;\r\n  var exp = ((uint32 >> 23) & 0xff) - 127;\r\n  var fraction = (uint32 & 0x7fffff) | 0x800000;\r\n  return (sign === 0 ? 1 : -1) *\r\n    fraction * Math.pow(2, exp - 23);\r\n};\r\n\r\nUnpacker.prototype.unpack_double = function () {\r\n  var h32 = this.unpack_uint32();\r\n  var l32 = this.unpack_uint32();\r\n  var sign = h32 >> 31;\r\n  var exp = ((h32 >> 20) & 0x7ff) - 1023;\r\n  var hfrac = (h32 & 0xfffff) | 0x100000;\r\n  var frac = hfrac * Math.pow(2, exp - 20) +\r\n    l32 * Math.pow(2, exp - 52);\r\n  return (sign === 0 ? 1 : -1) * frac;\r\n};\r\n\r\nUnpacker.prototype.read = function (length) {\r\n  var j = this.index;\r\n  if (j + length <= this.length) {\r\n    return this.dataView.subarray(j, j + length);\r\n  } else {\r\n    throw new Error('BinaryPackFailure: read index out of range');\r\n  }\r\n};\r\n\r\nfunction Packer () {\r\n  this.bufferBuilder = new BufferBuilder();\r\n}\r\n\r\nPacker.prototype.getBuffer = function () {\r\n  return this.bufferBuilder.getBuffer();\r\n};\r\n\r\nPacker.prototype.pack = function (value) {\r\n  var type = typeof (value);\r\n  if (type === 'string') {\r\n    this.pack_string(value);\r\n  } else if (type === 'number') {\r\n    if (Math.floor(value) === value) {\r\n      this.pack_integer(value);\r\n    } else {\r\n      this.pack_double(value);\r\n    }\r\n  } else if (type === 'boolean') {\r\n    if (value === true) {\r\n      this.bufferBuilder.append(0xc3);\r\n    } else if (value === false) {\r\n      this.bufferBuilder.append(0xc2);\r\n    }\r\n  } else if (type === 'undefined') {\r\n    this.bufferBuilder.append(0xc0);\r\n  } else if (type === 'object') {\r\n    if (value === null) {\r\n      this.bufferBuilder.append(0xc0);\r\n    } else {\r\n      var constructor = value.constructor;\r\n      if (constructor == Array) {\r\n        this.pack_array(value);\r\n      } else if (constructor == Blob || constructor == File || value instanceof Blob || value instanceof File) {\r\n        this.pack_bin(value);\r\n      } else if (constructor == ArrayBuffer) {\r\n        if (binaryFeatures.useArrayBufferView) {\r\n          this.pack_bin(new Uint8Array(value));\r\n        } else {\r\n          this.pack_bin(value);\r\n        }\r\n      } else if ('BYTES_PER_ELEMENT' in value) {\r\n        if (binaryFeatures.useArrayBufferView) {\r\n          this.pack_bin(new Uint8Array(value.buffer));\r\n        } else {\r\n          this.pack_bin(value.buffer);\r\n        }\r\n      } else if ((constructor == Object) || (constructor.toString().startsWith('class'))) {\r\n        this.pack_object(value);\r\n      } else if (constructor == Date) {\r\n        this.pack_string(value.toString());\r\n      } else if (typeof value.toBinaryPack === 'function') {\r\n        this.bufferBuilder.append(value.toBinaryPack());\r\n      } else {\r\n        throw new Error('Type \"' + constructor.toString() + '\" not yet supported');\r\n      }\r\n    }\r\n  } else {\r\n    throw new Error('Type \"' + type + '\" not yet supported');\r\n  }\r\n  this.bufferBuilder.flush();\r\n};\r\n\r\nPacker.prototype.pack_bin = function (blob) {\r\n  var length = blob.length || blob.byteLength || blob.size;\r\n  if (length <= 0x0f) {\r\n    this.pack_uint8(0xa0 + length);\r\n  } else if (length <= 0xffff) {\r\n    this.bufferBuilder.append(0xda);\r\n    this.pack_uint16(length);\r\n  } else if (length <= 0xffffffff) {\r\n    this.bufferBuilder.append(0xdb);\r\n    this.pack_uint32(length);\r\n  } else {\r\n    throw new Error('Invalid length');\r\n  }\r\n  this.bufferBuilder.append(blob);\r\n};\r\n\r\nPacker.prototype.pack_string = function (str) {\r\n  var length = utf8Length(str);\r\n\r\n  if (length <= 0x0f) {\r\n    this.pack_uint8(0xb0 + length);\r\n  } else if (length <= 0xffff) {\r\n    this.bufferBuilder.append(0xd8);\r\n    this.pack_uint16(length);\r\n  } else if (length <= 0xffffffff) {\r\n    this.bufferBuilder.append(0xd9);\r\n    this.pack_uint32(length);\r\n  } else {\r\n    throw new Error('Invalid length');\r\n  }\r\n  this.bufferBuilder.append(str);\r\n};\r\n\r\nPacker.prototype.pack_array = function (ary) {\r\n  var length = ary.length;\r\n  if (length <= 0x0f) {\r\n    this.pack_uint8(0x90 + length);\r\n  } else if (length <= 0xffff) {\r\n    this.bufferBuilder.append(0xdc);\r\n    this.pack_uint16(length);\r\n  } else if (length <= 0xffffffff) {\r\n    this.bufferBuilder.append(0xdd);\r\n    this.pack_uint32(length);\r\n  } else {\r\n    throw new Error('Invalid length');\r\n  }\r\n  for (var i = 0; i < length; i++) {\r\n    this.pack(ary[i]);\r\n  }\r\n};\r\n\r\nPacker.prototype.pack_integer = function (num) {\r\n  if (num >= -0x20 && num <= 0x7f) {\r\n    this.bufferBuilder.append(num & 0xff);\r\n  } else if (num >= 0x00 && num <= 0xff) {\r\n    this.bufferBuilder.append(0xcc);\r\n    this.pack_uint8(num);\r\n  } else if (num >= -0x80 && num <= 0x7f) {\r\n    this.bufferBuilder.append(0xd0);\r\n    this.pack_int8(num);\r\n  } else if (num >= 0x0000 && num <= 0xffff) {\r\n    this.bufferBuilder.append(0xcd);\r\n    this.pack_uint16(num);\r\n  } else if (num >= -0x8000 && num <= 0x7fff) {\r\n    this.bufferBuilder.append(0xd1);\r\n    this.pack_int16(num);\r\n  } else if (num >= 0x00000000 && num <= 0xffffffff) {\r\n    this.bufferBuilder.append(0xce);\r\n    this.pack_uint32(num);\r\n  } else if (num >= -0x80000000 && num <= 0x7fffffff) {\r\n    this.bufferBuilder.append(0xd2);\r\n    this.pack_int32(num);\r\n  } else if (num >= -0x8000000000000000 && num <= 0x7FFFFFFFFFFFFFFF) {\r\n    this.bufferBuilder.append(0xd3);\r\n    this.pack_int64(num);\r\n  } else if (num >= 0x0000000000000000 && num <= 0xFFFFFFFFFFFFFFFF) {\r\n    this.bufferBuilder.append(0xcf);\r\n    this.pack_uint64(num);\r\n  } else {\r\n    throw new Error('Invalid integer');\r\n  }\r\n};\r\n\r\nPacker.prototype.pack_double = function (num) {\r\n  var sign = 0;\r\n  if (num < 0) {\r\n    sign = 1;\r\n    num = -num;\r\n  }\r\n  var exp = Math.floor(Math.log(num) / Math.LN2);\r\n  var frac0 = num / Math.pow(2, exp) - 1;\r\n  var frac1 = Math.floor(frac0 * Math.pow(2, 52));\r\n  var b32 = Math.pow(2, 32);\r\n  var h32 = (sign << 31) | ((exp + 1023) << 20) |\r\n    (frac1 / b32) & 0x0fffff;\r\n  var l32 = frac1 % b32;\r\n  this.bufferBuilder.append(0xcb);\r\n  this.pack_int32(h32);\r\n  this.pack_int32(l32);\r\n};\r\n\r\nPacker.prototype.pack_object = function (obj) {\r\n  var keys = Object.keys(obj);\r\n  var length = keys.length;\r\n  if (length <= 0x0f) {\r\n    this.pack_uint8(0x80 + length);\r\n  } else if (length <= 0xffff) {\r\n    this.bufferBuilder.append(0xde);\r\n    this.pack_uint16(length);\r\n  } else if (length <= 0xffffffff) {\r\n    this.bufferBuilder.append(0xdf);\r\n    this.pack_uint32(length);\r\n  } else {\r\n    throw new Error('Invalid length');\r\n  }\r\n  for (var prop in obj) {\r\n    if (obj.hasOwnProperty(prop)) {\r\n      this.pack(prop);\r\n      this.pack(obj[prop]);\r\n    }\r\n  }\r\n};\r\n\r\nPacker.prototype.pack_uint8 = function (num) {\r\n  this.bufferBuilder.append(num);\r\n};\r\n\r\nPacker.prototype.pack_uint16 = function (num) {\r\n  this.bufferBuilder.append(num >> 8);\r\n  this.bufferBuilder.append(num & 0xff);\r\n};\r\n\r\nPacker.prototype.pack_uint32 = function (num) {\r\n  var n = num & 0xffffffff;\r\n  this.bufferBuilder.append((n & 0xff000000) >>> 24);\r\n  this.bufferBuilder.append((n & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((n & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((n & 0x000000ff));\r\n};\r\n\r\nPacker.prototype.pack_uint64 = function (num) {\r\n  var high = num / Math.pow(2, 32);\r\n  var low = num % Math.pow(2, 32);\r\n  this.bufferBuilder.append((high & 0xff000000) >>> 24);\r\n  this.bufferBuilder.append((high & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((high & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((high & 0x000000ff));\r\n  this.bufferBuilder.append((low & 0xff000000) >>> 24);\r\n  this.bufferBuilder.append((low & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((low & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((low & 0x000000ff));\r\n};\r\n\r\nPacker.prototype.pack_int8 = function (num) {\r\n  this.bufferBuilder.append(num & 0xff);\r\n};\r\n\r\nPacker.prototype.pack_int16 = function (num) {\r\n  this.bufferBuilder.append((num & 0xff00) >> 8);\r\n  this.bufferBuilder.append(num & 0xff);\r\n};\r\n\r\nPacker.prototype.pack_int32 = function (num) {\r\n  this.bufferBuilder.append((num >>> 24) & 0xff);\r\n  this.bufferBuilder.append((num & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((num & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((num & 0x000000ff));\r\n};\r\n\r\nPacker.prototype.pack_int64 = function (num) {\r\n  var high = Math.floor(num / Math.pow(2, 32));\r\n  var low = num % Math.pow(2, 32);\r\n  this.bufferBuilder.append((high & 0xff000000) >>> 24);\r\n  this.bufferBuilder.append((high & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((high & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((high & 0x000000ff));\r\n  this.bufferBuilder.append((low & 0xff000000) >>> 24);\r\n  this.bufferBuilder.append((low & 0x00ff0000) >>> 16);\r\n  this.bufferBuilder.append((low & 0x0000ff00) >>> 8);\r\n  this.bufferBuilder.append((low & 0x000000ff));\r\n};\r\n\r\nfunction _utf8Replace (m) {\r\n  var code = m.charCodeAt(0);\r\n\r\n  if (code <= 0x7ff) return '00';\r\n  if (code <= 0xffff) return '000';\r\n  if (code <= 0x1fffff) return '0000';\r\n  if (code <= 0x3ffffff) return '00000';\r\n  return '000000';\r\n}\r\n\r\nfunction utf8Length (str) {\r\n  if (str.length > 600) {\r\n    // Blob method faster for large strings\r\n    return (new Blob([str])).size;\r\n  } else {\r\n    return str.replace(/[^\\u0000-\\u007F]/g, _utf8Replace).length;\r\n  }\r\n}\r\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nlet logDisabled_ = true;\nlet deprecationWarnings_ = true;\n\n/**\n * Extract browser version out of the provided user agent string.\n *\n * @param {!string} uastring userAgent string.\n * @param {!string} expr Regular expression used as match criteria.\n * @param {!number} pos position in the version string to be returned.\n * @return {!number} browser version.\n */\nexport function extractVersion(uastring, expr, pos) {\n  const match = uastring.match(expr);\n  return match && match.length >= pos && parseInt(match[pos], 10);\n}\n\n// Wraps the peerconnection event eventNameToWrap in a function\n// which returns the modified event object (or false to prevent\n// the event).\nexport function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  const proto = window.RTCPeerConnection.prototype;\n  const nativeAddEventListener = proto.addEventListener;\n  proto.addEventListener = function(nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap) {\n      return nativeAddEventListener.apply(this, arguments);\n    }\n    const wrappedCallback = (e) => {\n      const modifiedEvent = wrapper(e);\n      if (modifiedEvent) {\n        if (cb.handleEvent) {\n          cb.handleEvent(modifiedEvent);\n        } else {\n          cb(modifiedEvent);\n        }\n      }\n    };\n    this._eventMap = this._eventMap || {};\n    if (!this._eventMap[eventNameToWrap]) {\n      this._eventMap[eventNameToWrap] = new Map();\n    }\n    this._eventMap[eventNameToWrap].set(cb, wrappedCallback);\n    return nativeAddEventListener.apply(this, [nativeEventName,\n      wrappedCallback]);\n  };\n\n  const nativeRemoveEventListener = proto.removeEventListener;\n  proto.removeEventListener = function(nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap || !this._eventMap\n        || !this._eventMap[eventNameToWrap]) {\n      return nativeRemoveEventListener.apply(this, arguments);\n    }\n    if (!this._eventMap[eventNameToWrap].has(cb)) {\n      return nativeRemoveEventListener.apply(this, arguments);\n    }\n    const unwrappedCb = this._eventMap[eventNameToWrap].get(cb);\n    this._eventMap[eventNameToWrap].delete(cb);\n    if (this._eventMap[eventNameToWrap].size === 0) {\n      delete this._eventMap[eventNameToWrap];\n    }\n    if (Object.keys(this._eventMap).length === 0) {\n      delete this._eventMap;\n    }\n    return nativeRemoveEventListener.apply(this, [nativeEventName,\n      unwrappedCb]);\n  };\n\n  Object.defineProperty(proto, 'on' + eventNameToWrap, {\n    get() {\n      return this['_on' + eventNameToWrap];\n    },\n    set(cb) {\n      if (this['_on' + eventNameToWrap]) {\n        this.removeEventListener(eventNameToWrap,\n            this['_on' + eventNameToWrap]);\n        delete this['_on' + eventNameToWrap];\n      }\n      if (cb) {\n        this.addEventListener(eventNameToWrap,\n            this['_on' + eventNameToWrap] = cb);\n      }\n    },\n    enumerable: true,\n    configurable: true\n  });\n}\n\nexport function disableLog(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + typeof bool +\n        '. Please use a boolean.');\n  }\n  logDisabled_ = bool;\n  return (bool) ? 'adapter.js logging disabled' :\n      'adapter.js logging enabled';\n}\n\n/**\n * Disable or enable deprecation warnings\n * @param {!boolean} bool set to true to disable warnings.\n */\nexport function disableWarnings(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + typeof bool +\n        '. Please use a boolean.');\n  }\n  deprecationWarnings_ = !bool;\n  return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');\n}\n\nexport function log() {\n  if (typeof window === 'object') {\n    if (logDisabled_) {\n      return;\n    }\n    if (typeof console !== 'undefined' && typeof console.log === 'function') {\n      console.log.apply(console, arguments);\n    }\n  }\n}\n\n/**\n * Shows a deprecation warning suggesting the modern and spec-compatible API.\n */\nexport function deprecated(oldMethod, newMethod) {\n  if (!deprecationWarnings_) {\n    return;\n  }\n  console.warn(oldMethod + ' is deprecated, please use ' + newMethod +\n      ' instead.');\n}\n\n/**\n * Browser detector.\n *\n * @return {object} result containing browser and version\n *     properties.\n */\nexport function detectBrowser(window) {\n  // Returned result object.\n  const result = {browser: null, version: null};\n\n  // Fail early if it's not a browser\n  if (typeof window === 'undefined' || !window.navigator) {\n    result.browser = 'Not a browser.';\n    return result;\n  }\n\n  const {navigator} = window;\n\n  if (navigator.mozGetUserMedia) { // Firefox.\n    result.browser = 'firefox';\n    result.version = extractVersion(navigator.userAgent,\n        /Firefox\\/(\\d+)\\./, 1);\n  } else if (navigator.webkitGetUserMedia ||\n      (window.isSecureContext === false && window.webkitRTCPeerConnection &&\n       !window.RTCIceGatherer)) {\n    // Chrome, Chromium, Webview, Opera.\n    // Version matches Chrome/WebRTC version.\n    // Chrome 74 removed webkitGetUserMedia on http as well so we need the\n    // more complicated fallback to webkitRTCPeerConnection.\n    result.browser = 'chrome';\n    result.version = extractVersion(navigator.userAgent,\n        /Chrom(e|ium)\\/(\\d+)\\./, 2);\n  } else if (navigator.mediaDevices &&\n      navigator.userAgent.match(/Edge\\/(\\d+).(\\d+)$/)) { // Edge.\n    result.browser = 'edge';\n    result.version = extractVersion(navigator.userAgent,\n        /Edge\\/(\\d+).(\\d+)$/, 2);\n  } else if (window.RTCPeerConnection &&\n      navigator.userAgent.match(/AppleWebKit\\/(\\d+)\\./)) { // Safari.\n    result.browser = 'safari';\n    result.version = extractVersion(navigator.userAgent,\n        /AppleWebKit\\/(\\d+)\\./, 1);\n    result.supportsUnifiedPlan = window.RTCRtpTransceiver &&\n        'currentDirection' in window.RTCRtpTransceiver.prototype;\n  } else { // Default fallthrough: not supported.\n    result.browser = 'Not a supported browser.';\n    return result;\n  }\n\n  return result;\n}\n\n/**\n * Checks if something is an object.\n *\n * @param {*} val The something you want to check.\n * @return true if val is an object, false otherwise.\n */\nfunction isObject(val) {\n  return Object.prototype.toString.call(val) === '[object Object]';\n}\n\n/**\n * Remove all empty objects and undefined values\n * from a nested object -- an enhanced and vanilla version\n * of Lodash's `compact`.\n */\nexport function compactObject(data) {\n  if (!isObject(data)) {\n    return data;\n  }\n\n  return Object.keys(data).reduce(function(accumulator, key) {\n    const isObj = isObject(data[key]);\n    const value = isObj ? compactObject(data[key]) : data[key];\n    const isEmptyObject = isObj && !Object.keys(value).length;\n    if (value === undefined || isEmptyObject) {\n      return accumulator;\n    }\n    return Object.assign(accumulator, {[key]: value});\n  }, {});\n}\n\n/* iterates the stats graph recursively. */\nexport function walkStats(stats, base, resultSet) {\n  if (!base || resultSet.has(base.id)) {\n    return;\n  }\n  resultSet.set(base.id, base);\n  Object.keys(base).forEach(name => {\n    if (name.endsWith('Id')) {\n      walkStats(stats, stats.get(base[name]), resultSet);\n    } else if (name.endsWith('Ids')) {\n      base[name].forEach(id => {\n        walkStats(stats, stats.get(id), resultSet);\n      });\n    }\n  });\n}\n\n/* filter getStats for a sender/receiver track. */\nexport function filterStats(result, track, outbound) {\n  const streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';\n  const filteredResult = new Map();\n  if (track === null) {\n    return filteredResult;\n  }\n  const trackStats = [];\n  result.forEach(value => {\n    if (value.type === 'track' &&\n        value.trackIdentifier === track.id) {\n      trackStats.push(value);\n    }\n  });\n  trackStats.forEach(trackStat => {\n    result.forEach(stats => {\n      if (stats.type === streamStatsType && stats.trackId === trackStat.id) {\n        walkStats(result, stats, filteredResult);\n      }\n    });\n  });\n  return filteredResult;\n}\n\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\nimport * as utils from '../utils.js';\nconst logging = utils.log;\n\nexport function shimGetUserMedia(window, browserDetails) {\n  const navigator = window && window.navigator;\n\n  if (!navigator.mediaDevices) {\n    return;\n  }\n\n  const constraintsToChrome_ = function(c) {\n    if (typeof c !== 'object' || c.mandatory || c.optional) {\n      return c;\n    }\n    const cc = {};\n    Object.keys(c).forEach(key => {\n      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {\n        return;\n      }\n      const r = (typeof c[key] === 'object') ? c[key] : {ideal: c[key]};\n      if (r.exact !== undefined && typeof r.exact === 'number') {\n        r.min = r.max = r.exact;\n      }\n      const oldname_ = function(prefix, name) {\n        if (prefix) {\n          return prefix + name.charAt(0).toUpperCase() + name.slice(1);\n        }\n        return (name === 'deviceId') ? 'sourceId' : name;\n      };\n      if (r.ideal !== undefined) {\n        cc.optional = cc.optional || [];\n        let oc = {};\n        if (typeof r.ideal === 'number') {\n          oc[oldname_('min', key)] = r.ideal;\n          cc.optional.push(oc);\n          oc = {};\n          oc[oldname_('max', key)] = r.ideal;\n          cc.optional.push(oc);\n        } else {\n          oc[oldname_('', key)] = r.ideal;\n          cc.optional.push(oc);\n        }\n      }\n      if (r.exact !== undefined && typeof r.exact !== 'number') {\n        cc.mandatory = cc.mandatory || {};\n        cc.mandatory[oldname_('', key)] = r.exact;\n      } else {\n        ['min', 'max'].forEach(mix => {\n          if (r[mix] !== undefined) {\n            cc.mandatory = cc.mandatory || {};\n            cc.mandatory[oldname_(mix, key)] = r[mix];\n          }\n        });\n      }\n    });\n    if (c.advanced) {\n      cc.optional = (cc.optional || []).concat(c.advanced);\n    }\n    return cc;\n  };\n\n  const shimConstraints_ = function(constraints, func) {\n    if (browserDetails.version >= 61) {\n      return func(constraints);\n    }\n    constraints = JSON.parse(JSON.stringify(constraints));\n    if (constraints && typeof constraints.audio === 'object') {\n      const remap = function(obj, a, b) {\n        if (a in obj && !(b in obj)) {\n          obj[b] = obj[a];\n          delete obj[a];\n        }\n      };\n      constraints = JSON.parse(JSON.stringify(constraints));\n      remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');\n      remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');\n      constraints.audio = constraintsToChrome_(constraints.audio);\n    }\n    if (constraints && typeof constraints.video === 'object') {\n      // Shim facingMode for mobile & surface pro.\n      let face = constraints.video.facingMode;\n      face = face && ((typeof face === 'object') ? face : {ideal: face});\n      const getSupportedFacingModeLies = browserDetails.version < 66;\n\n      if ((face && (face.exact === 'user' || face.exact === 'environment' ||\n                    face.ideal === 'user' || face.ideal === 'environment')) &&\n          !(navigator.mediaDevices.getSupportedConstraints &&\n            navigator.mediaDevices.getSupportedConstraints().facingMode &&\n            !getSupportedFacingModeLies)) {\n        delete constraints.video.facingMode;\n        let matches;\n        if (face.exact === 'environment' || face.ideal === 'environment') {\n          matches = ['back', 'rear'];\n        } else if (face.exact === 'user' || face.ideal === 'user') {\n          matches = ['front'];\n        }\n        if (matches) {\n          // Look for matches in label, or use last cam for back (typical).\n          return navigator.mediaDevices.enumerateDevices()\n          .then(devices => {\n            devices = devices.filter(d => d.kind === 'videoinput');\n            let dev = devices.find(d => matches.some(match =>\n              d.label.toLowerCase().includes(match)));\n            if (!dev && devices.length && matches.includes('back')) {\n              dev = devices[devices.length - 1]; // more likely the back cam\n            }\n            if (dev) {\n              constraints.video.deviceId = face.exact ? {exact: dev.deviceId} :\n                                                        {ideal: dev.deviceId};\n            }\n            constraints.video = constraintsToChrome_(constraints.video);\n            logging('chrome: ' + JSON.stringify(constraints));\n            return func(constraints);\n          });\n        }\n      }\n      constraints.video = constraintsToChrome_(constraints.video);\n    }\n    logging('chrome: ' + JSON.stringify(constraints));\n    return func(constraints);\n  };\n\n  const shimError_ = function(e) {\n    if (browserDetails.version >= 64) {\n      return e;\n    }\n    return {\n      name: {\n        PermissionDeniedError: 'NotAllowedError',\n        PermissionDismissedError: 'NotAllowedError',\n        InvalidStateError: 'NotAllowedError',\n        DevicesNotFoundError: 'NotFoundError',\n        ConstraintNotSatisfiedError: 'OverconstrainedError',\n        TrackStartError: 'NotReadableError',\n        MediaDeviceFailedDueToShutdown: 'NotAllowedError',\n        MediaDeviceKillSwitchOn: 'NotAllowedError',\n        TabCaptureError: 'AbortError',\n        ScreenCaptureError: 'AbortError',\n        DeviceCaptureError: 'AbortError'\n      }[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint || e.constraintName,\n      toString() {\n        return this.name + (this.message && ': ') + this.message;\n      }\n    };\n  };\n\n  const getUserMedia_ = function(constraints, onSuccess, onError) {\n    shimConstraints_(constraints, c => {\n      navigator.webkitGetUserMedia(c, onSuccess, e => {\n        if (onError) {\n          onError(shimError_(e));\n        }\n      });\n    });\n  };\n  navigator.getUserMedia = getUserMedia_.bind(navigator);\n\n  // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia\n  // function which returns a Promise, it does not accept spec-style\n  // constraints.\n  if (navigator.mediaDevices.getUserMedia) {\n    const origGetUserMedia = navigator.mediaDevices.getUserMedia.\n        bind(navigator.mediaDevices);\n    navigator.mediaDevices.getUserMedia = function(cs) {\n      return shimConstraints_(cs, c => origGetUserMedia(c).then(stream => {\n        if (c.audio && !stream.getAudioTracks().length ||\n            c.video && !stream.getVideoTracks().length) {\n          stream.getTracks().forEach(track => {\n            track.stop();\n          });\n          throw new DOMException('', 'NotFoundError');\n        }\n        return stream;\n      }, e => Promise.reject(shimError_(e))));\n    };\n  }\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\nexport function shimGetDisplayMedia(window, getSourceId) {\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  // getSourceId is a function that returns a promise resolving with\n  // the sourceId of the screen/window/tab to be shared.\n  if (typeof getSourceId !== 'function') {\n    console.error('shimGetDisplayMedia: getSourceId argument is not ' +\n        'a function');\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    function getDisplayMedia(constraints) {\n      return getSourceId(constraints)\n        .then(sourceId => {\n          const widthSpecified = constraints.video && constraints.video.width;\n          const heightSpecified = constraints.video &&\n            constraints.video.height;\n          const frameRateSpecified = constraints.video &&\n            constraints.video.frameRate;\n          constraints.video = {\n            mandatory: {\n              chromeMediaSource: 'desktop',\n              chromeMediaSourceId: sourceId,\n              maxFrameRate: frameRateSpecified || 3\n            }\n          };\n          if (widthSpecified) {\n            constraints.video.mandatory.maxWidth = widthSpecified;\n          }\n          if (heightSpecified) {\n            constraints.video.mandatory.maxHeight = heightSpecified;\n          }\n          return window.navigator.mediaDevices.getUserMedia(constraints);\n        });\n    };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\nimport * as utils from '../utils.js';\n\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimMediaStream(window) {\n  window.MediaStream = window.MediaStream || window.webkitMediaStream;\n}\n\nexport function shimOnTrack(window) {\n  if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in\n      window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {\n      get() {\n        return this._ontrack;\n      },\n      set(f) {\n        if (this._ontrack) {\n          this.removeEventListener('track', this._ontrack);\n        }\n        this.addEventListener('track', this._ontrack = f);\n      },\n      enumerable: true,\n      configurable: true\n    });\n    const origSetRemoteDescription =\n        window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription =\n      function setRemoteDescription() {\n        if (!this._ontrackpoly) {\n          this._ontrackpoly = (e) => {\n            // onaddstream does not fire when a track is added to an existing\n            // stream. But stream.onaddtrack is implemented so we use that.\n            e.stream.addEventListener('addtrack', te => {\n              let receiver;\n              if (window.RTCPeerConnection.prototype.getReceivers) {\n                receiver = this.getReceivers()\n                  .find(r => r.track && r.track.id === te.track.id);\n              } else {\n                receiver = {track: te.track};\n              }\n\n              const event = new Event('track');\n              event.track = te.track;\n              event.receiver = receiver;\n              event.transceiver = {receiver};\n              event.streams = [e.stream];\n              this.dispatchEvent(event);\n            });\n            e.stream.getTracks().forEach(track => {\n              let receiver;\n              if (window.RTCPeerConnection.prototype.getReceivers) {\n                receiver = this.getReceivers()\n                  .find(r => r.track && r.track.id === track.id);\n              } else {\n                receiver = {track};\n              }\n              const event = new Event('track');\n              event.track = track;\n              event.receiver = receiver;\n              event.transceiver = {receiver};\n              event.streams = [e.stream];\n              this.dispatchEvent(event);\n            });\n          };\n          this.addEventListener('addstream', this._ontrackpoly);\n        }\n        return origSetRemoteDescription.apply(this, arguments);\n      };\n  } else {\n    // even if RTCRtpTransceiver is in window, it is only used and\n    // emitted in unified-plan. Unfortunately this means we need\n    // to unconditionally wrap the event.\n    utils.wrapPeerConnectionEvent(window, 'track', e => {\n      if (!e.transceiver) {\n        Object.defineProperty(e, 'transceiver',\n          {value: {receiver: e.receiver}});\n      }\n      return e;\n    });\n  }\n}\n\nexport function shimGetSendersWithDtmf(window) {\n  // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.\n  if (typeof window === 'object' && window.RTCPeerConnection &&\n      !('getSenders' in window.RTCPeerConnection.prototype) &&\n      'createDTMFSender' in window.RTCPeerConnection.prototype) {\n    const shimSenderWithDtmf = function(pc, track) {\n      return {\n        track,\n        get dtmf() {\n          if (this._dtmf === undefined) {\n            if (track.kind === 'audio') {\n              this._dtmf = pc.createDTMFSender(track);\n            } else {\n              this._dtmf = null;\n            }\n          }\n          return this._dtmf;\n        },\n        _pc: pc\n      };\n    };\n\n    // augment addTrack when getSenders is not available.\n    if (!window.RTCPeerConnection.prototype.getSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n        this._senders = this._senders || [];\n        return this._senders.slice(); // return a copy of the internal state.\n      };\n      const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n      window.RTCPeerConnection.prototype.addTrack =\n        function addTrack(track, stream) {\n          let sender = origAddTrack.apply(this, arguments);\n          if (!sender) {\n            sender = shimSenderWithDtmf(this, track);\n            this._senders.push(sender);\n          }\n          return sender;\n        };\n\n      const origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n      window.RTCPeerConnection.prototype.removeTrack =\n        function removeTrack(sender) {\n          origRemoveTrack.apply(this, arguments);\n          const idx = this._senders.indexOf(sender);\n          if (idx !== -1) {\n            this._senders.splice(idx, 1);\n          }\n        };\n    }\n    const origAddStream = window.RTCPeerConnection.prototype.addStream;\n    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n      this._senders = this._senders || [];\n      origAddStream.apply(this, [stream]);\n      stream.getTracks().forEach(track => {\n        this._senders.push(shimSenderWithDtmf(this, track));\n      });\n    };\n\n    const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n    window.RTCPeerConnection.prototype.removeStream =\n      function removeStream(stream) {\n        this._senders = this._senders || [];\n        origRemoveStream.apply(this, [stream]);\n\n        stream.getTracks().forEach(track => {\n          const sender = this._senders.find(s => s.track === track);\n          if (sender) { // remove sender\n            this._senders.splice(this._senders.indexOf(sender), 1);\n          }\n        });\n      };\n  } else if (typeof window === 'object' && window.RTCPeerConnection &&\n             'getSenders' in window.RTCPeerConnection.prototype &&\n             'createDTMFSender' in window.RTCPeerConnection.prototype &&\n             window.RTCRtpSender &&\n             !('dtmf' in window.RTCRtpSender.prototype)) {\n    const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n      const senders = origGetSenders.apply(this, []);\n      senders.forEach(sender => sender._pc = this);\n      return senders;\n    };\n\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = this._pc.createDTMFSender(this.track);\n          } else {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n}\n\nexport function shimGetStats(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  const origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    const [selector, onSucc, onErr] = arguments;\n\n    // If selector is a function then we are in the old style stats so just\n    // pass back the original getStats format to avoid breaking old users.\n    if (arguments.length > 0 && typeof selector === 'function') {\n      return origGetStats.apply(this, arguments);\n    }\n\n    // When spec-style getStats is supported, return those when called with\n    // either no arguments or the selector argument is null.\n    if (origGetStats.length === 0 && (arguments.length === 0 ||\n        typeof selector !== 'function')) {\n      return origGetStats.apply(this, []);\n    }\n\n    const fixChromeStats_ = function(response) {\n      const standardReport = {};\n      const reports = response.result();\n      reports.forEach(report => {\n        const standardStats = {\n          id: report.id,\n          timestamp: report.timestamp,\n          type: {\n            localcandidate: 'local-candidate',\n            remotecandidate: 'remote-candidate'\n          }[report.type] || report.type\n        };\n        report.names().forEach(name => {\n          standardStats[name] = report.stat(name);\n        });\n        standardReport[standardStats.id] = standardStats;\n      });\n\n      return standardReport;\n    };\n\n    // shim getStats with maplike support\n    const makeMapStats = function(stats) {\n      return new Map(Object.keys(stats).map(key => [key, stats[key]]));\n    };\n\n    if (arguments.length >= 2) {\n      const successCallbackWrapper_ = function(response) {\n        onSucc(makeMapStats(fixChromeStats_(response)));\n      };\n\n      return origGetStats.apply(this, [successCallbackWrapper_,\n        selector]);\n    }\n\n    // promise-support\n    return new Promise((resolve, reject) => {\n      origGetStats.apply(this, [\n        function(response) {\n          resolve(makeMapStats(fixChromeStats_(response)));\n        }, reject]);\n    }).then(onSucc, onErr);\n  };\n}\n\nexport function shimSenderReceiverGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender && window.RTCRtpReceiver)) {\n    return;\n  }\n\n  // shim sender stats.\n  if (!('getStats' in window.RTCRtpSender.prototype)) {\n    const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    if (origGetSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n        const senders = origGetSenders.apply(this, []);\n        senders.forEach(sender => sender._pc = this);\n        return senders;\n      };\n    }\n\n    const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n    if (origAddTrack) {\n      window.RTCPeerConnection.prototype.addTrack = function addTrack() {\n        const sender = origAddTrack.apply(this, arguments);\n        sender._pc = this;\n        return sender;\n      };\n    }\n    window.RTCRtpSender.prototype.getStats = function getStats() {\n      const sender = this;\n      return this._pc.getStats().then(result =>\n        /* Note: this will include stats of all senders that\n         *   send a track with the same id as sender.track as\n         *   it is not possible to identify the RTCRtpSender.\n         */\n        utils.filterStats(result, sender.track, true));\n    };\n  }\n\n  // shim receiver stats.\n  if (!('getStats' in window.RTCRtpReceiver.prototype)) {\n    const origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n    if (origGetReceivers) {\n      window.RTCPeerConnection.prototype.getReceivers =\n        function getReceivers() {\n          const receivers = origGetReceivers.apply(this, []);\n          receivers.forEach(receiver => receiver._pc = this);\n          return receivers;\n        };\n    }\n    utils.wrapPeerConnectionEvent(window, 'track', e => {\n      e.receiver._pc = e.srcElement;\n      return e;\n    });\n    window.RTCRtpReceiver.prototype.getStats = function getStats() {\n      const receiver = this;\n      return this._pc.getStats().then(result =>\n        utils.filterStats(result, receiver.track, false));\n    };\n  }\n\n  if (!('getStats' in window.RTCRtpSender.prototype &&\n      'getStats' in window.RTCRtpReceiver.prototype)) {\n    return;\n  }\n\n  // shim RTCPeerConnection.getStats(track).\n  const origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    if (arguments.length > 0 &&\n        arguments[0] instanceof window.MediaStreamTrack) {\n      const track = arguments[0];\n      let sender;\n      let receiver;\n      let err;\n      this.getSenders().forEach(s => {\n        if (s.track === track) {\n          if (sender) {\n            err = true;\n          } else {\n            sender = s;\n          }\n        }\n      });\n      this.getReceivers().forEach(r => {\n        if (r.track === track) {\n          if (receiver) {\n            err = true;\n          } else {\n            receiver = r;\n          }\n        }\n        return r.track === track;\n      });\n      if (err || (sender && receiver)) {\n        return Promise.reject(new DOMException(\n          'There are more than one sender or receiver for the track.',\n          'InvalidAccessError'));\n      } else if (sender) {\n        return sender.getStats();\n      } else if (receiver) {\n        return receiver.getStats();\n      }\n      return Promise.reject(new DOMException(\n        'There is no sender or receiver for the track.',\n        'InvalidAccessError'));\n    }\n    return origGetStats.apply(this, arguments);\n  };\n}\n\nexport function shimAddTrackRemoveTrackWithNative(window) {\n  // shim addTrack/removeTrack with native variants in order to make\n  // the interactions with legacy getLocalStreams behave as in other browsers.\n  // Keeps a mapping stream.id => [stream, rtpsenders...]\n  window.RTCPeerConnection.prototype.getLocalStreams =\n    function getLocalStreams() {\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n      return Object.keys(this._shimmedLocalStreams)\n        .map(streamId => this._shimmedLocalStreams[streamId][0]);\n    };\n\n  const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  window.RTCPeerConnection.prototype.addTrack =\n    function addTrack(track, stream) {\n      if (!stream) {\n        return origAddTrack.apply(this, arguments);\n      }\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n      const sender = origAddTrack.apply(this, arguments);\n      if (!this._shimmedLocalStreams[stream.id]) {\n        this._shimmedLocalStreams[stream.id] = [stream, sender];\n      } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {\n        this._shimmedLocalStreams[stream.id].push(sender);\n      }\n      return sender;\n    };\n\n  const origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n    stream.getTracks().forEach(track => {\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n    });\n    const existingSenders = this.getSenders();\n    origAddStream.apply(this, arguments);\n    const newSenders = this.getSenders()\n      .filter(newSender => existingSenders.indexOf(newSender) === -1);\n    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);\n  };\n\n  const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream =\n    function removeStream(stream) {\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n      delete this._shimmedLocalStreams[stream.id];\n      return origRemoveStream.apply(this, arguments);\n    };\n\n  const origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n  window.RTCPeerConnection.prototype.removeTrack =\n    function removeTrack(sender) {\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n      if (sender) {\n        Object.keys(this._shimmedLocalStreams).forEach(streamId => {\n          const idx = this._shimmedLocalStreams[streamId].indexOf(sender);\n          if (idx !== -1) {\n            this._shimmedLocalStreams[streamId].splice(idx, 1);\n          }\n          if (this._shimmedLocalStreams[streamId].length === 1) {\n            delete this._shimmedLocalStreams[streamId];\n          }\n        });\n      }\n      return origRemoveTrack.apply(this, arguments);\n    };\n}\n\nexport function shimAddTrackRemoveTrack(window, browserDetails) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  // shim addTrack and removeTrack.\n  if (window.RTCPeerConnection.prototype.addTrack &&\n      browserDetails.version >= 65) {\n    return shimAddTrackRemoveTrackWithNative(window);\n  }\n\n  // also shim pc.getLocalStreams when addTrack is shimmed\n  // to return the original streams.\n  const origGetLocalStreams = window.RTCPeerConnection.prototype\n      .getLocalStreams;\n  window.RTCPeerConnection.prototype.getLocalStreams =\n    function getLocalStreams() {\n      const nativeStreams = origGetLocalStreams.apply(this);\n      this._reverseStreams = this._reverseStreams || {};\n      return nativeStreams.map(stream => this._reverseStreams[stream.id]);\n    };\n\n  const origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n\n    stream.getTracks().forEach(track => {\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n    });\n    // Add identity mapping for consistency with addTrack.\n    // Unless this is being used with a stream from addTrack.\n    if (!this._reverseStreams[stream.id]) {\n      const newStream = new window.MediaStream(stream.getTracks());\n      this._streams[stream.id] = newStream;\n      this._reverseStreams[newStream.id] = stream;\n      stream = newStream;\n    }\n    origAddStream.apply(this, [stream]);\n  };\n\n  const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream =\n    function removeStream(stream) {\n      this._streams = this._streams || {};\n      this._reverseStreams = this._reverseStreams || {};\n\n      origRemoveStream.apply(this, [(this._streams[stream.id] || stream)]);\n      delete this._reverseStreams[(this._streams[stream.id] ?\n          this._streams[stream.id].id : stream.id)];\n      delete this._streams[stream.id];\n    };\n\n  window.RTCPeerConnection.prototype.addTrack =\n    function addTrack(track, stream) {\n      if (this.signalingState === 'closed') {\n        throw new DOMException(\n          'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n          'InvalidStateError');\n      }\n      const streams = [].slice.call(arguments, 1);\n      if (streams.length !== 1 ||\n          !streams[0].getTracks().find(t => t === track)) {\n        // this is not fully correct but all we can manage without\n        // [[associated MediaStreams]] internal slot.\n        throw new DOMException(\n          'The adapter.js addTrack polyfill only supports a single ' +\n          ' stream which is associated with the specified track.',\n          'NotSupportedError');\n      }\n\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n\n      this._streams = this._streams || {};\n      this._reverseStreams = this._reverseStreams || {};\n      const oldStream = this._streams[stream.id];\n      if (oldStream) {\n        // this is using odd Chrome behaviour, use with caution:\n        // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815\n        // Note: we rely on the high-level addTrack/dtmf shim to\n        // create the sender with a dtmf sender.\n        oldStream.addTrack(track);\n\n        // Trigger ONN async.\n        Promise.resolve().then(() => {\n          this.dispatchEvent(new Event('negotiationneeded'));\n        });\n      } else {\n        const newStream = new window.MediaStream([track]);\n        this._streams[stream.id] = newStream;\n        this._reverseStreams[newStream.id] = stream;\n        this.addStream(newStream);\n      }\n      return this.getSenders().find(s => s.track === track);\n    };\n\n  // replace the internal stream id with the external one and\n  // vice versa.\n  function replaceInternalStreamId(pc, description) {\n    let sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(internalId => {\n      const externalStream = pc._reverseStreams[internalId];\n      const internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(internalStream.id, 'g'),\n          externalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp\n    });\n  }\n  function replaceExternalStreamId(pc, description) {\n    let sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(internalId => {\n      const externalStream = pc._reverseStreams[internalId];\n      const internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(externalStream.id, 'g'),\n          internalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp\n    });\n  }\n  ['createOffer', 'createAnswer'].forEach(function(method) {\n    const nativeMethod = window.RTCPeerConnection.prototype[method];\n    const methodObj = {[method]() {\n      const args = arguments;\n      const isLegacyCall = arguments.length &&\n          typeof arguments[0] === 'function';\n      if (isLegacyCall) {\n        return nativeMethod.apply(this, [\n          (description) => {\n            const desc = replaceInternalStreamId(this, description);\n            args[0].apply(null, [desc]);\n          },\n          (err) => {\n            if (args[1]) {\n              args[1].apply(null, err);\n            }\n          }, arguments[2]\n        ]);\n      }\n      return nativeMethod.apply(this, arguments)\n      .then(description => replaceInternalStreamId(this, description));\n    }};\n    window.RTCPeerConnection.prototype[method] = methodObj[method];\n  });\n\n  const origSetLocalDescription =\n      window.RTCPeerConnection.prototype.setLocalDescription;\n  window.RTCPeerConnection.prototype.setLocalDescription =\n    function setLocalDescription() {\n      if (!arguments.length || !arguments[0].type) {\n        return origSetLocalDescription.apply(this, arguments);\n      }\n      arguments[0] = replaceExternalStreamId(this, arguments[0]);\n      return origSetLocalDescription.apply(this, arguments);\n    };\n\n  // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier\n\n  const origLocalDescription = Object.getOwnPropertyDescriptor(\n      window.RTCPeerConnection.prototype, 'localDescription');\n  Object.defineProperty(window.RTCPeerConnection.prototype,\n      'localDescription', {\n        get() {\n          const description = origLocalDescription.get.apply(this);\n          if (description.type === '') {\n            return description;\n          }\n          return replaceInternalStreamId(this, description);\n        }\n      });\n\n  window.RTCPeerConnection.prototype.removeTrack =\n    function removeTrack(sender) {\n      if (this.signalingState === 'closed') {\n        throw new DOMException(\n          'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n          'InvalidStateError');\n      }\n      // We can not yet check for sender instanceof RTCRtpSender\n      // since we shim RTPSender. So we check if sender._pc is set.\n      if (!sender._pc) {\n        throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' +\n            'does not implement interface RTCRtpSender.', 'TypeError');\n      }\n      const isLocal = sender._pc === this;\n      if (!isLocal) {\n        throw new DOMException('Sender was not created by this connection.',\n            'InvalidAccessError');\n      }\n\n      // Search for the native stream the senders track belongs to.\n      this._streams = this._streams || {};\n      let stream;\n      Object.keys(this._streams).forEach(streamid => {\n        const hasTrack = this._streams[streamid].getTracks()\n          .find(track => sender.track === track);\n        if (hasTrack) {\n          stream = this._streams[streamid];\n        }\n      });\n\n      if (stream) {\n        if (stream.getTracks().length === 1) {\n          // if this is the last track of the stream, remove the stream. This\n          // takes care of any shimmed _senders.\n          this.removeStream(this._reverseStreams[stream.id]);\n        } else {\n          // relying on the same odd chrome behaviour as above.\n          stream.removeTrack(sender.track);\n        }\n        this.dispatchEvent(new Event('negotiationneeded'));\n      }\n    };\n}\n\nexport function shimPeerConnection(window, browserDetails) {\n  if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.webkitRTCPeerConnection;\n  }\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  // shim implicit creation of RTCSessionDescription/RTCIceCandidate\n  if (browserDetails.version < 53) {\n    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n        .forEach(function(method) {\n          const nativeMethod = window.RTCPeerConnection.prototype[method];\n          const methodObj = {[method]() {\n            arguments[0] = new ((method === 'addIceCandidate') ?\n                window.RTCIceCandidate :\n                window.RTCSessionDescription)(arguments[0]);\n            return nativeMethod.apply(this, arguments);\n          }};\n          window.RTCPeerConnection.prototype[method] = methodObj[method];\n        });\n  }\n}\n\n// Attempt to fix ONN in plan-b mode.\nexport function fixNegotiationNeeded(window, browserDetails) {\n  utils.wrapPeerConnectionEvent(window, 'negotiationneeded', e => {\n    const pc = e.target;\n    if (browserDetails.version < 72 || (pc.getConfiguration &&\n        pc.getConfiguration().sdpSemantics === 'plan-b')) {\n      if (pc.signalingState !== 'stable') {\n        return;\n      }\n    }\n    return e;\n  });\n}\n","/*\n *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nexport function filterIceServers(iceServers, edgeVersion) {\n  let hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(server => {\n    if (server && (server.urls || server.url)) {\n      let urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n      }\n      const isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(url => {\n        // filter STUN unconditionally.\n        if (url.indexOf('stun:') === 0) {\n          return false;\n        }\n\n        const validTurn = url.startsWith('turn') &&\n            !url.startsWith('turn:[') &&\n            url.includes('transport=udp');\n        if (validTurn && !hasTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return validTurn && !hasTurn;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n","/* eslint-env node */\n'use strict';\n\n// SDP helpers.\nvar SDPUtils = {};\n\n// Generate an alphanumeric identifier for cname or mids.\n// TODO: use UUIDs instead? https://gist.github.com/jed/982883\nSDPUtils.generateIdentifier = function() {\n  return Math.random().toString(36).substr(2, 10);\n};\n\n// The RTCP CNAME used by all peerconnections from the same JS.\nSDPUtils.localCName = SDPUtils.generateIdentifier();\n\n// Splits SDP into lines, dealing with both CRLF and LF.\nSDPUtils.splitLines = function(blob) {\n  return blob.trim().split('\\n').map(function(line) {\n    return line.trim();\n  });\n};\n// Splits SDP into sessionpart and mediasections. Ensures CRLF.\nSDPUtils.splitSections = function(blob) {\n  var parts = blob.split('\\nm=');\n  return parts.map(function(part, index) {\n    return (index > 0 ? 'm=' + part : part).trim() + '\\r\\n';\n  });\n};\n\n// returns the session description.\nSDPUtils.getDescription = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  return sections && sections[0];\n};\n\n// returns the individual media sections.\nSDPUtils.getMediaSections = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  sections.shift();\n  return sections;\n};\n\n// Returns lines that start with a certain prefix.\nSDPUtils.matchPrefix = function(blob, prefix) {\n  return SDPUtils.splitLines(blob).filter(function(line) {\n    return line.indexOf(prefix) === 0;\n  });\n};\n\n// Parses an ICE candidate line. Sample input:\n// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8\n// rport 55996\"\nSDPUtils.parseCandidate = function(line) {\n  var parts;\n  // Parse both variants.\n  if (line.indexOf('a=candidate:') === 0) {\n    parts = line.substring(12).split(' ');\n  } else {\n    parts = line.substring(10).split(' ');\n  }\n\n  var candidate = {\n    foundation: parts[0],\n    component: parseInt(parts[1], 10),\n    protocol: parts[2].toLowerCase(),\n    priority: parseInt(parts[3], 10),\n    ip: parts[4],\n    address: parts[4], // address is an alias for ip.\n    port: parseInt(parts[5], 10),\n    // skip parts[6] == 'typ'\n    type: parts[7]\n  };\n\n  for (var i = 8; i < parts.length; i += 2) {\n    switch (parts[i]) {\n      case 'raddr':\n        candidate.relatedAddress = parts[i + 1];\n        break;\n      case 'rport':\n        candidate.relatedPort = parseInt(parts[i + 1], 10);\n        break;\n      case 'tcptype':\n        candidate.tcpType = parts[i + 1];\n        break;\n      case 'ufrag':\n        candidate.ufrag = parts[i + 1]; // for backward compability.\n        candidate.usernameFragment = parts[i + 1];\n        break;\n      default: // extension handling, in particular ufrag\n        candidate[parts[i]] = parts[i + 1];\n        break;\n    }\n  }\n  return candidate;\n};\n\n// Translates a candidate object into SDP candidate attribute.\nSDPUtils.writeCandidate = function(candidate) {\n  var sdp = [];\n  sdp.push(candidate.foundation);\n  sdp.push(candidate.component);\n  sdp.push(candidate.protocol.toUpperCase());\n  sdp.push(candidate.priority);\n  sdp.push(candidate.address || candidate.ip);\n  sdp.push(candidate.port);\n\n  var type = candidate.type;\n  sdp.push('typ');\n  sdp.push(type);\n  if (type !== 'host' && candidate.relatedAddress &&\n      candidate.relatedPort) {\n    sdp.push('raddr');\n    sdp.push(candidate.relatedAddress);\n    sdp.push('rport');\n    sdp.push(candidate.relatedPort);\n  }\n  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {\n    sdp.push('tcptype');\n    sdp.push(candidate.tcpType);\n  }\n  if (candidate.usernameFragment || candidate.ufrag) {\n    sdp.push('ufrag');\n    sdp.push(candidate.usernameFragment || candidate.ufrag);\n  }\n  return 'candidate:' + sdp.join(' ');\n};\n\n// Parses an ice-options line, returns an array of option tags.\n// a=ice-options:foo bar\nSDPUtils.parseIceOptions = function(line) {\n  return line.substr(14).split(' ');\n};\n\n// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:\n// a=rtpmap:111 opus/48000/2\nSDPUtils.parseRtpMap = function(line) {\n  var parts = line.substr(9).split(' ');\n  var parsed = {\n    payloadType: parseInt(parts.shift(), 10) // was: id\n  };\n\n  parts = parts[0].split('/');\n\n  parsed.name = parts[0];\n  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate\n  parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;\n  // legacy alias, got renamed back to channels in ORTC.\n  parsed.numChannels = parsed.channels;\n  return parsed;\n};\n\n// Generate an a=rtpmap line from RTCRtpCodecCapability or\n// RTCRtpCodecParameters.\nSDPUtils.writeRtpMap = function(codec) {\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  var channels = codec.channels || codec.numChannels || 1;\n  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +\n      (channels !== 1 ? '/' + channels : '') + '\\r\\n';\n};\n\n// Parses an a=extmap line (headerextension from RFC 5285). Sample input:\n// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset\n// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset\nSDPUtils.parseExtmap = function(line) {\n  var parts = line.substr(9).split(' ');\n  return {\n    id: parseInt(parts[0], 10),\n    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',\n    uri: parts[1]\n  };\n};\n\n// Generates a=extmap line from RTCRtpHeaderExtensionParameters or\n// RTCRtpHeaderExtension.\nSDPUtils.writeExtmap = function(headerExtension) {\n  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +\n      (headerExtension.direction && headerExtension.direction !== 'sendrecv'\n        ? '/' + headerExtension.direction\n        : '') +\n      ' ' + headerExtension.uri + '\\r\\n';\n};\n\n// Parses an ftmp line, returns dictionary. Sample input:\n// a=fmtp:96 vbr=on;cng=on\n// Also deals with vbr=on; cng=on\nSDPUtils.parseFmtp = function(line) {\n  var parsed = {};\n  var kv;\n  var parts = line.substr(line.indexOf(' ') + 1).split(';');\n  for (var j = 0; j < parts.length; j++) {\n    kv = parts[j].trim().split('=');\n    parsed[kv[0].trim()] = kv[1];\n  }\n  return parsed;\n};\n\n// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeFmtp = function(codec) {\n  var line = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.parameters && Object.keys(codec.parameters).length) {\n    var params = [];\n    Object.keys(codec.parameters).forEach(function(param) {\n      if (codec.parameters[param]) {\n        params.push(param + '=' + codec.parameters[param]);\n      } else {\n        params.push(param);\n      }\n    });\n    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\\r\\n';\n  }\n  return line;\n};\n\n// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:\n// a=rtcp-fb:98 nack rpsi\nSDPUtils.parseRtcpFb = function(line) {\n  var parts = line.substr(line.indexOf(' ') + 1).split(' ');\n  return {\n    type: parts.shift(),\n    parameter: parts.join(' ')\n  };\n};\n// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeRtcpFb = function(codec) {\n  var lines = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {\n    // FIXME: special handling for trr-int?\n    codec.rtcpFeedback.forEach(function(fb) {\n      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +\n      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +\n          '\\r\\n';\n    });\n  }\n  return lines;\n};\n\n// Parses an RFC 5576 ssrc media attribute. Sample input:\n// a=ssrc:3735928559 cname:something\nSDPUtils.parseSsrcMedia = function(line) {\n  var sp = line.indexOf(' ');\n  var parts = {\n    ssrc: parseInt(line.substr(7, sp - 7), 10)\n  };\n  var colon = line.indexOf(':', sp);\n  if (colon > -1) {\n    parts.attribute = line.substr(sp + 1, colon - sp - 1);\n    parts.value = line.substr(colon + 1);\n  } else {\n    parts.attribute = line.substr(sp + 1);\n  }\n  return parts;\n};\n\nSDPUtils.parseSsrcGroup = function(line) {\n  var parts = line.substr(13).split(' ');\n  return {\n    semantics: parts.shift(),\n    ssrcs: parts.map(function(ssrc) {\n      return parseInt(ssrc, 10);\n    })\n  };\n};\n\n// Extracts the MID (RFC 5888) from a media section.\n// returns the MID or undefined if no mid line was found.\nSDPUtils.getMid = function(mediaSection) {\n  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];\n  if (mid) {\n    return mid.substr(6);\n  }\n};\n\nSDPUtils.parseFingerprint = function(line) {\n  var parts = line.substr(14).split(' ');\n  return {\n    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.\n    value: parts[1]\n  };\n};\n\n// Extracts DTLS parameters from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the fingerprint line as input. See also getIceParameters.\nSDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=fingerprint:');\n  // Note: a=setup line is ignored since we use the 'auto' role.\n  // Note2: 'algorithm' is not case sensitive except in Edge.\n  return {\n    role: 'auto',\n    fingerprints: lines.map(SDPUtils.parseFingerprint)\n  };\n};\n\n// Serializes DTLS parameters to SDP.\nSDPUtils.writeDtlsParameters = function(params, setupType) {\n  var sdp = 'a=setup:' + setupType + '\\r\\n';\n  params.fingerprints.forEach(function(fp) {\n    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\\r\\n';\n  });\n  return sdp;\n};\n\n// Parses a=crypto lines into\n//   https://rawgit.com/aboba/edgertc/master/msortc-rs4.html#dictionary-rtcsrtpsdesparameters-members\nSDPUtils.parseCryptoLine = function(line) {\n  var parts = line.substr(9).split(' ');\n  return {\n    tag: parseInt(parts[0], 10),\n    cryptoSuite: parts[1],\n    keyParams: parts[2],\n    sessionParams: parts.slice(3),\n  };\n};\n\nSDPUtils.writeCryptoLine = function(parameters) {\n  return 'a=crypto:' + parameters.tag + ' ' +\n    parameters.cryptoSuite + ' ' +\n    (typeof parameters.keyParams === 'object'\n      ? SDPUtils.writeCryptoKeyParams(parameters.keyParams)\n      : parameters.keyParams) +\n    (parameters.sessionParams ? ' ' + parameters.sessionParams.join(' ') : '') +\n    '\\r\\n';\n};\n\n// Parses the crypto key parameters into\n//   https://rawgit.com/aboba/edgertc/master/msortc-rs4.html#rtcsrtpkeyparam*\nSDPUtils.parseCryptoKeyParams = function(keyParams) {\n  if (keyParams.indexOf('inline:') !== 0) {\n    return null;\n  }\n  var parts = keyParams.substr(7).split('|');\n  return {\n    keyMethod: 'inline',\n    keySalt: parts[0],\n    lifeTime: parts[1],\n    mkiValue: parts[2] ? parts[2].split(':')[0] : undefined,\n    mkiLength: parts[2] ? parts[2].split(':')[1] : undefined,\n  };\n};\n\nSDPUtils.writeCryptoKeyParams = function(keyParams) {\n  return keyParams.keyMethod + ':'\n    + keyParams.keySalt +\n    (keyParams.lifeTime ? '|' + keyParams.lifeTime : '') +\n    (keyParams.mkiValue && keyParams.mkiLength\n      ? '|' + keyParams.mkiValue + ':' + keyParams.mkiLength\n      : '');\n};\n\n// Extracts all SDES paramters.\nSDPUtils.getCryptoParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=crypto:');\n  return lines.map(SDPUtils.parseCryptoLine);\n};\n\n// Parses ICE information from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the ice-ufrag and ice-pwd lines as input.\nSDPUtils.getIceParameters = function(mediaSection, sessionpart) {\n  var ufrag = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=ice-ufrag:')[0];\n  var pwd = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=ice-pwd:')[0];\n  if (!(ufrag && pwd)) {\n    return null;\n  }\n  return {\n    usernameFragment: ufrag.substr(12),\n    password: pwd.substr(10),\n  };\n};\n\n// Serializes ICE parameters to SDP.\nSDPUtils.writeIceParameters = function(params) {\n  return 'a=ice-ufrag:' + params.usernameFragment + '\\r\\n' +\n      'a=ice-pwd:' + params.password + '\\r\\n';\n};\n\n// Parses the SDP media section and returns RTCRtpParameters.\nSDPUtils.parseRtpParameters = function(mediaSection) {\n  var description = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: [],\n    rtcp: []\n  };\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]\n    var pt = mline[i];\n    var rtpmapline = SDPUtils.matchPrefix(\n      mediaSection, 'a=rtpmap:' + pt + ' ')[0];\n    if (rtpmapline) {\n      var codec = SDPUtils.parseRtpMap(rtpmapline);\n      var fmtps = SDPUtils.matchPrefix(\n        mediaSection, 'a=fmtp:' + pt + ' ');\n      // Only the first a=fmtp:<pt> is considered.\n      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};\n      codec.rtcpFeedback = SDPUtils.matchPrefix(\n        mediaSection, 'a=rtcp-fb:' + pt + ' ')\n        .map(SDPUtils.parseRtcpFb);\n      description.codecs.push(codec);\n      // parse FEC mechanisms from rtpmap lines.\n      switch (codec.name.toUpperCase()) {\n        case 'RED':\n        case 'ULPFEC':\n          description.fecMechanisms.push(codec.name.toUpperCase());\n          break;\n        default: // only RED and ULPFEC are recognized as FEC mechanisms.\n          break;\n      }\n    }\n  }\n  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {\n    description.headerExtensions.push(SDPUtils.parseExtmap(line));\n  });\n  // FIXME: parse rtcp.\n  return description;\n};\n\n// Generates parts of the SDP media section describing the capabilities /\n// parameters.\nSDPUtils.writeRtpDescription = function(kind, caps) {\n  var sdp = '';\n\n  // Build the mline.\n  sdp += 'm=' + kind + ' ';\n  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.\n  sdp += ' UDP/TLS/RTP/SAVPF ';\n  sdp += caps.codecs.map(function(codec) {\n    if (codec.preferredPayloadType !== undefined) {\n      return codec.preferredPayloadType;\n    }\n    return codec.payloadType;\n  }).join(' ') + '\\r\\n';\n\n  sdp += 'c=IN IP4 0.0.0.0\\r\\n';\n  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\\r\\n';\n\n  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.\n  caps.codecs.forEach(function(codec) {\n    sdp += SDPUtils.writeRtpMap(codec);\n    sdp += SDPUtils.writeFmtp(codec);\n    sdp += SDPUtils.writeRtcpFb(codec);\n  });\n  var maxptime = 0;\n  caps.codecs.forEach(function(codec) {\n    if (codec.maxptime > maxptime) {\n      maxptime = codec.maxptime;\n    }\n  });\n  if (maxptime > 0) {\n    sdp += 'a=maxptime:' + maxptime + '\\r\\n';\n  }\n  sdp += 'a=rtcp-mux\\r\\n';\n\n  if (caps.headerExtensions) {\n    caps.headerExtensions.forEach(function(extension) {\n      sdp += SDPUtils.writeExtmap(extension);\n    });\n  }\n  // FIXME: write fecMechanisms.\n  return sdp;\n};\n\n// Parses the SDP media section and returns an array of\n// RTCRtpEncodingParameters.\nSDPUtils.parseRtpEncodingParameters = function(mediaSection) {\n  var encodingParameters = [];\n  var description = SDPUtils.parseRtpParameters(mediaSection);\n  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;\n  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;\n\n  // filter a=ssrc:... cname:, ignore PlanB-msid\n  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(parts) {\n      return parts.attribute === 'cname';\n    });\n  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;\n  var secondarySsrc;\n\n  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')\n    .map(function(line) {\n      var parts = line.substr(17).split(' ');\n      return parts.map(function(part) {\n        return parseInt(part, 10);\n      });\n    });\n  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {\n    secondarySsrc = flows[0][1];\n  }\n\n  description.codecs.forEach(function(codec) {\n    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {\n      var encParam = {\n        ssrc: primarySsrc,\n        codecPayloadType: parseInt(codec.parameters.apt, 10)\n      };\n      if (primarySsrc && secondarySsrc) {\n        encParam.rtx = {ssrc: secondarySsrc};\n      }\n      encodingParameters.push(encParam);\n      if (hasRed) {\n        encParam = JSON.parse(JSON.stringify(encParam));\n        encParam.fec = {\n          ssrc: primarySsrc,\n          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'\n        };\n        encodingParameters.push(encParam);\n      }\n    }\n  });\n  if (encodingParameters.length === 0 && primarySsrc) {\n    encodingParameters.push({\n      ssrc: primarySsrc\n    });\n  }\n\n  // we support both b=AS and b=TIAS but interpret AS as TIAS.\n  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');\n  if (bandwidth.length) {\n    if (bandwidth[0].indexOf('b=TIAS:') === 0) {\n      bandwidth = parseInt(bandwidth[0].substr(7), 10);\n    } else if (bandwidth[0].indexOf('b=AS:') === 0) {\n      // use formula from JSEP to convert b=AS to TIAS value.\n      bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95\n          - (50 * 40 * 8);\n    } else {\n      bandwidth = undefined;\n    }\n    encodingParameters.forEach(function(params) {\n      params.maxBitrate = bandwidth;\n    });\n  }\n  return encodingParameters;\n};\n\n// parses http://draft.ortc.org/#rtcrtcpparameters*\nSDPUtils.parseRtcpParameters = function(mediaSection) {\n  var rtcpParameters = {};\n\n  // Gets the first SSRC. Note tha with RTX there might be multiple\n  // SSRCs.\n  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(obj) {\n      return obj.attribute === 'cname';\n    })[0];\n  if (remoteSsrc) {\n    rtcpParameters.cname = remoteSsrc.value;\n    rtcpParameters.ssrc = remoteSsrc.ssrc;\n  }\n\n  // Edge uses the compound attribute instead of reducedSize\n  // compound is !reducedSize\n  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');\n  rtcpParameters.reducedSize = rsize.length > 0;\n  rtcpParameters.compound = rsize.length === 0;\n\n  // parses the rtcp-mux attrіbute.\n  // Note that Edge does not support unmuxed RTCP.\n  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');\n  rtcpParameters.mux = mux.length > 0;\n\n  return rtcpParameters;\n};\n\n// parses either a=msid: or a=ssrc:... msid lines and returns\n// the id of the MediaStream and MediaStreamTrack.\nSDPUtils.parseMsid = function(mediaSection) {\n  var parts;\n  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');\n  if (spec.length === 1) {\n    parts = spec[0].substr(7).split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(msidParts) {\n      return msidParts.attribute === 'msid';\n    });\n  if (planB.length > 0) {\n    parts = planB[0].value.split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n};\n\n// SCTP\n// parses draft-ietf-mmusic-sctp-sdp-26 first and falls back\n// to draft-ietf-mmusic-sctp-sdp-05\nSDPUtils.parseSctpDescription = function(mediaSection) {\n  var mline = SDPUtils.parseMLine(mediaSection);\n  var maxSizeLine = SDPUtils.matchPrefix(mediaSection, 'a=max-message-size:');\n  var maxMessageSize;\n  if (maxSizeLine.length > 0) {\n    maxMessageSize = parseInt(maxSizeLine[0].substr(19), 10);\n  }\n  if (isNaN(maxMessageSize)) {\n    maxMessageSize = 65536;\n  }\n  var sctpPort = SDPUtils.matchPrefix(mediaSection, 'a=sctp-port:');\n  if (sctpPort.length > 0) {\n    return {\n      port: parseInt(sctpPort[0].substr(12), 10),\n      protocol: mline.fmt,\n      maxMessageSize: maxMessageSize\n    };\n  }\n  var sctpMapLines = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:');\n  if (sctpMapLines.length > 0) {\n    var parts = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:')[0]\n      .substr(10)\n      .split(' ');\n    return {\n      port: parseInt(parts[0], 10),\n      protocol: parts[1],\n      maxMessageSize: maxMessageSize\n    };\n  }\n};\n\n// SCTP\n// outputs the draft-ietf-mmusic-sctp-sdp-26 version that all browsers\n// support by now receiving in this format, unless we originally parsed\n// as the draft-ietf-mmusic-sctp-sdp-05 format (indicated by the m-line\n// protocol of DTLS/SCTP -- without UDP/ or TCP/)\nSDPUtils.writeSctpDescription = function(media, sctp) {\n  var output = [];\n  if (media.protocol !== 'DTLS/SCTP') {\n    output = [\n      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.protocol + '\\r\\n',\n      'c=IN IP4 0.0.0.0\\r\\n',\n      'a=sctp-port:' + sctp.port + '\\r\\n'\n    ];\n  } else {\n    output = [\n      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.port + '\\r\\n',\n      'c=IN IP4 0.0.0.0\\r\\n',\n      'a=sctpmap:' + sctp.port + ' ' + sctp.protocol + ' 65535\\r\\n'\n    ];\n  }\n  if (sctp.maxMessageSize !== undefined) {\n    output.push('a=max-message-size:' + sctp.maxMessageSize + '\\r\\n');\n  }\n  return output.join('');\n};\n\n// Generate a session ID for SDP.\n// https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1\n// recommends using a cryptographically random +ve 64-bit value\n// but right now this should be acceptable and within the right range\nSDPUtils.generateSessionId = function() {\n  return Math.random().toString().substr(2, 21);\n};\n\n// Write boilder plate for start of SDP\n// sessId argument is optional - if not supplied it will\n// be generated randomly\n// sessVersion is optional and defaults to 2\n// sessUser is optional and defaults to 'thisisadapterortc'\nSDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {\n  var sessionId;\n  var version = sessVer !== undefined ? sessVer : 2;\n  if (sessId) {\n    sessionId = sessId;\n  } else {\n    sessionId = SDPUtils.generateSessionId();\n  }\n  var user = sessUser || 'thisisadapterortc';\n  // FIXME: sess-id should be an NTP timestamp.\n  return 'v=0\\r\\n' +\n      'o=' + user + ' ' + sessionId + ' ' + version +\n        ' IN IP4 127.0.0.1\\r\\n' +\n      's=-\\r\\n' +\n      't=0 0\\r\\n';\n};\n\nSDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n    transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n    transceiver.dtlsTransport.getLocalParameters(),\n    type === 'offer' ? 'actpass' : 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.direction) {\n    sdp += 'a=' + transceiver.direction + '\\r\\n';\n  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    // spec.\n    var msid = 'msid:' + stream.id + ' ' +\n        transceiver.rtpSender.track.id + '\\r\\n';\n    sdp += 'a=' + msid;\n\n    // for Chrome.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n};\n\n// Gets the direction from the mediaSection or the sessionpart.\nSDPUtils.getDirection = function(mediaSection, sessionpart) {\n  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.\n  var lines = SDPUtils.splitLines(mediaSection);\n  for (var i = 0; i < lines.length; i++) {\n    switch (lines[i]) {\n      case 'a=sendrecv':\n      case 'a=sendonly':\n      case 'a=recvonly':\n      case 'a=inactive':\n        return lines[i].substr(2);\n      default:\n        // FIXME: What should happen here?\n    }\n  }\n  if (sessionpart) {\n    return SDPUtils.getDirection(sessionpart);\n  }\n  return 'sendrecv';\n};\n\nSDPUtils.getKind = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  return mline[0].substr(2);\n};\n\nSDPUtils.isRejected = function(mediaSection) {\n  return mediaSection.split(' ', 2)[1] === '0';\n};\n\nSDPUtils.parseMLine = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var parts = lines[0].substr(2).split(' ');\n  return {\n    kind: parts[0],\n    port: parseInt(parts[1], 10),\n    protocol: parts[2],\n    fmt: parts.slice(3).join(' ')\n  };\n};\n\nSDPUtils.parseOLine = function(mediaSection) {\n  var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];\n  var parts = line.substr(2).split(' ');\n  return {\n    username: parts[0],\n    sessionId: parts[1],\n    sessionVersion: parseInt(parts[2], 10),\n    netType: parts[3],\n    addressType: parts[4],\n    address: parts[5]\n  };\n};\n\n// a very naive interpretation of a valid SDP.\nSDPUtils.isValidSDP = function(blob) {\n  if (typeof blob !== 'string' || blob.length === 0) {\n    return false;\n  }\n  var lines = SDPUtils.splitLines(blob);\n  for (var i = 0; i < lines.length; i++) {\n    if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {\n      return false;\n    }\n    // TODO: check the modifier a bit more.\n  }\n  return true;\n};\n\n// Expose public methods.\nif (typeof module === 'object') {\n  module.exports = SDPUtils;\n}\n","/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nvar SDPUtils = require('sdp');\n\nfunction fixStatsType(stat) {\n  return {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  }[stat.type] || stat.type;\n}\n\nfunction writeMediaSection(transceiver, caps, type, stream, dtlsRole) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n      transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n      transceiver.dtlsTransport.getLocalParameters(),\n      type === 'offer' ? 'actpass' : dtlsRole || 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    var trackId = transceiver.rtpSender._initialTrackId ||\n        transceiver.rtpSender.track.id;\n    transceiver.rtpSender._initialTrackId = trackId;\n    // spec.\n    var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +\n        trackId + '\\r\\n';\n    sdp += 'a=' + msid;\n    // for Chrome. Legacy should no longer be required.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n\n    // RTX\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n}\n\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nfunction filterIceServers(iceServers, edgeVersion) {\n  var hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(function(server) {\n    if (server && (server.urls || server.url)) {\n      var urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        console.warn('RTCIceServer.url is deprecated! Use urls instead.');\n      }\n      var isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(function(url) {\n        var validTurn = url.indexOf('turn:') === 0 &&\n            url.indexOf('transport=udp') !== -1 &&\n            url.indexOf('turn:[') === -1 &&\n            !hasTurn;\n\n        if (validTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&\n            url.indexOf('?transport=udp') === -1;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n\n// Determines the intersection of local and remote capabilities.\nfunction getCommonCapabilities(localCapabilities, remoteCapabilities) {\n  var commonCapabilities = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: []\n  };\n\n  var findCodecByPayloadType = function(pt, codecs) {\n    pt = parseInt(pt, 10);\n    for (var i = 0; i < codecs.length; i++) {\n      if (codecs[i].payloadType === pt ||\n          codecs[i].preferredPayloadType === pt) {\n        return codecs[i];\n      }\n    }\n  };\n\n  var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {\n    var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);\n    var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);\n    return lCodec && rCodec &&\n        lCodec.name.toLowerCase() === rCodec.name.toLowerCase();\n  };\n\n  localCapabilities.codecs.forEach(function(lCodec) {\n    for (var i = 0; i < remoteCapabilities.codecs.length; i++) {\n      var rCodec = remoteCapabilities.codecs[i];\n      if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&\n          lCodec.clockRate === rCodec.clockRate) {\n        if (lCodec.name.toLowerCase() === 'rtx' &&\n            lCodec.parameters && rCodec.parameters.apt) {\n          // for RTX we need to find the local rtx that has a apt\n          // which points to the same local codec as the remote one.\n          if (!rtxCapabilityMatches(lCodec, rCodec,\n              localCapabilities.codecs, remoteCapabilities.codecs)) {\n            continue;\n          }\n        }\n        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy\n        // number of channels is the highest common number of channels\n        rCodec.numChannels = Math.min(lCodec.numChannels,\n            rCodec.numChannels);\n        // push rCodec so we reply with offerer payload type\n        commonCapabilities.codecs.push(rCodec);\n\n        // determine common feedback mechanisms\n        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {\n          for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {\n            if (lCodec.rtcpFeedback[j].type === fb.type &&\n                lCodec.rtcpFeedback[j].parameter === fb.parameter) {\n              return true;\n            }\n          }\n          return false;\n        });\n        // FIXME: also need to determine .parameters\n        //  see https://github.com/openpeer/ortc/issues/569\n        break;\n      }\n    }\n  });\n\n  localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {\n    for (var i = 0; i < remoteCapabilities.headerExtensions.length;\n         i++) {\n      var rHeaderExtension = remoteCapabilities.headerExtensions[i];\n      if (lHeaderExtension.uri === rHeaderExtension.uri) {\n        commonCapabilities.headerExtensions.push(rHeaderExtension);\n        break;\n      }\n    }\n  });\n\n  // FIXME: fecMechanisms\n  return commonCapabilities;\n}\n\n// is action=setLocalDescription with type allowed in signalingState\nfunction isActionAllowedInSignalingState(action, type, signalingState) {\n  return {\n    offer: {\n      setLocalDescription: ['stable', 'have-local-offer'],\n      setRemoteDescription: ['stable', 'have-remote-offer']\n    },\n    answer: {\n      setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],\n      setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']\n    }\n  }[type][action].indexOf(signalingState) !== -1;\n}\n\nfunction maybeAddCandidate(iceTransport, candidate) {\n  // Edge's internal representation adds some fields therefore\n  // not all fieldѕ are taken into account.\n  var alreadyAdded = iceTransport.getRemoteCandidates()\n      .find(function(remoteCandidate) {\n        return candidate.foundation === remoteCandidate.foundation &&\n            candidate.ip === remoteCandidate.ip &&\n            candidate.port === remoteCandidate.port &&\n            candidate.priority === remoteCandidate.priority &&\n            candidate.protocol === remoteCandidate.protocol &&\n            candidate.type === remoteCandidate.type;\n      });\n  if (!alreadyAdded) {\n    iceTransport.addRemoteCandidate(candidate);\n  }\n  return !alreadyAdded;\n}\n\n\nfunction makeError(name, description) {\n  var e = new Error(description);\n  e.name = name;\n  // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names\n  e.code = {\n    NotSupportedError: 9,\n    InvalidStateError: 11,\n    InvalidAccessError: 15,\n    TypeError: undefined,\n    OperationError: undefined\n  }[name];\n  return e;\n}\n\nmodule.exports = function(window, edgeVersion) {\n  // https://w3c.github.io/mediacapture-main/#mediastream\n  // Helper function to add the track to the stream and\n  // dispatch the event ourselves.\n  function addTrackToStreamAndFireEvent(track, stream) {\n    stream.addTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack',\n        {track: track}));\n  }\n\n  function removeTrackFromStreamAndFireEvent(track, stream) {\n    stream.removeTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack',\n        {track: track}));\n  }\n\n  function fireAddTrack(pc, track, receiver, streams) {\n    var trackEvent = new Event('track');\n    trackEvent.track = track;\n    trackEvent.receiver = receiver;\n    trackEvent.transceiver = {receiver: receiver};\n    trackEvent.streams = streams;\n    window.setTimeout(function() {\n      pc._dispatchEvent('track', trackEvent);\n    });\n  }\n\n  var RTCPeerConnection = function(config) {\n    var pc = this;\n\n    var _eventTarget = document.createDocumentFragment();\n    ['addEventListener', 'removeEventListener', 'dispatchEvent']\n        .forEach(function(method) {\n          pc[method] = _eventTarget[method].bind(_eventTarget);\n        });\n\n    this.canTrickleIceCandidates = null;\n\n    this.needNegotiation = false;\n\n    this.localStreams = [];\n    this.remoteStreams = [];\n\n    this._localDescription = null;\n    this._remoteDescription = null;\n\n    this.signalingState = 'stable';\n    this.iceConnectionState = 'new';\n    this.connectionState = 'new';\n    this.iceGatheringState = 'new';\n\n    config = JSON.parse(JSON.stringify(config || {}));\n\n    this.usingBundle = config.bundlePolicy === 'max-bundle';\n    if (config.rtcpMuxPolicy === 'negotiate') {\n      throw(makeError('NotSupportedError',\n          'rtcpMuxPolicy \\'negotiate\\' is not supported'));\n    } else if (!config.rtcpMuxPolicy) {\n      config.rtcpMuxPolicy = 'require';\n    }\n\n    switch (config.iceTransportPolicy) {\n      case 'all':\n      case 'relay':\n        break;\n      default:\n        config.iceTransportPolicy = 'all';\n        break;\n    }\n\n    switch (config.bundlePolicy) {\n      case 'balanced':\n      case 'max-compat':\n      case 'max-bundle':\n        break;\n      default:\n        config.bundlePolicy = 'balanced';\n        break;\n    }\n\n    config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);\n\n    this._iceGatherers = [];\n    if (config.iceCandidatePoolSize) {\n      for (var i = config.iceCandidatePoolSize; i > 0; i--) {\n        this._iceGatherers.push(new window.RTCIceGatherer({\n          iceServers: config.iceServers,\n          gatherPolicy: config.iceTransportPolicy\n        }));\n      }\n    } else {\n      config.iceCandidatePoolSize = 0;\n    }\n\n    this._config = config;\n\n    // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...\n    // everything that is needed to describe a SDP m-line.\n    this.transceivers = [];\n\n    this._sdpSessionId = SDPUtils.generateSessionId();\n    this._sdpSessionVersion = 0;\n\n    this._dtlsRole = undefined; // role for a=setup to use in answers.\n\n    this._isClosed = false;\n  };\n\n  Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {\n    configurable: true,\n    get: function() {\n      return this._localDescription;\n    }\n  });\n  Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {\n    configurable: true,\n    get: function() {\n      return this._remoteDescription;\n    }\n  });\n\n  // set up event handlers on prototype\n  RTCPeerConnection.prototype.onicecandidate = null;\n  RTCPeerConnection.prototype.onaddstream = null;\n  RTCPeerConnection.prototype.ontrack = null;\n  RTCPeerConnection.prototype.onremovestream = null;\n  RTCPeerConnection.prototype.onsignalingstatechange = null;\n  RTCPeerConnection.prototype.oniceconnectionstatechange = null;\n  RTCPeerConnection.prototype.onconnectionstatechange = null;\n  RTCPeerConnection.prototype.onicegatheringstatechange = null;\n  RTCPeerConnection.prototype.onnegotiationneeded = null;\n  RTCPeerConnection.prototype.ondatachannel = null;\n\n  RTCPeerConnection.prototype._dispatchEvent = function(name, event) {\n    if (this._isClosed) {\n      return;\n    }\n    this.dispatchEvent(event);\n    if (typeof this['on' + name] === 'function') {\n      this['on' + name](event);\n    }\n  };\n\n  RTCPeerConnection.prototype._emitGatheringStateChange = function() {\n    var event = new Event('icegatheringstatechange');\n    this._dispatchEvent('icegatheringstatechange', event);\n  };\n\n  RTCPeerConnection.prototype.getConfiguration = function() {\n    return this._config;\n  };\n\n  RTCPeerConnection.prototype.getLocalStreams = function() {\n    return this.localStreams;\n  };\n\n  RTCPeerConnection.prototype.getRemoteStreams = function() {\n    return this.remoteStreams;\n  };\n\n  // internal helper to create a transceiver object.\n  // (which is not yet the same as the WebRTC 1.0 transceiver)\n  RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {\n    var hasBundleTransport = this.transceivers.length > 0;\n    var transceiver = {\n      track: null,\n      iceGatherer: null,\n      iceTransport: null,\n      dtlsTransport: null,\n      localCapabilities: null,\n      remoteCapabilities: null,\n      rtpSender: null,\n      rtpReceiver: null,\n      kind: kind,\n      mid: null,\n      sendEncodingParameters: null,\n      recvEncodingParameters: null,\n      stream: null,\n      associatedRemoteMediaStreams: [],\n      wantReceive: true\n    };\n    if (this.usingBundle && hasBundleTransport) {\n      transceiver.iceTransport = this.transceivers[0].iceTransport;\n      transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;\n    } else {\n      var transports = this._createIceAndDtlsTransports();\n      transceiver.iceTransport = transports.iceTransport;\n      transceiver.dtlsTransport = transports.dtlsTransport;\n    }\n    if (!doNotAdd) {\n      this.transceivers.push(transceiver);\n    }\n    return transceiver;\n  };\n\n  RTCPeerConnection.prototype.addTrack = function(track, stream) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call addTrack on a closed peerconnection.');\n    }\n\n    var alreadyExists = this.transceivers.find(function(s) {\n      return s.track === track;\n    });\n\n    if (alreadyExists) {\n      throw makeError('InvalidAccessError', 'Track already exists.');\n    }\n\n    var transceiver;\n    for (var i = 0; i < this.transceivers.length; i++) {\n      if (!this.transceivers[i].track &&\n          this.transceivers[i].kind === track.kind) {\n        transceiver = this.transceivers[i];\n      }\n    }\n    if (!transceiver) {\n      transceiver = this._createTransceiver(track.kind);\n    }\n\n    this._maybeFireNegotiationNeeded();\n\n    if (this.localStreams.indexOf(stream) === -1) {\n      this.localStreams.push(stream);\n    }\n\n    transceiver.track = track;\n    transceiver.stream = stream;\n    transceiver.rtpSender = new window.RTCRtpSender(track,\n        transceiver.dtlsTransport);\n    return transceiver.rtpSender;\n  };\n\n  RTCPeerConnection.prototype.addStream = function(stream) {\n    var pc = this;\n    if (edgeVersion >= 15025) {\n      stream.getTracks().forEach(function(track) {\n        pc.addTrack(track, stream);\n      });\n    } else {\n      // Clone is necessary for local demos mostly, attaching directly\n      // to two different senders does not work (build 10547).\n      // Fixed in 15025 (or earlier)\n      var clonedStream = stream.clone();\n      stream.getTracks().forEach(function(track, idx) {\n        var clonedTrack = clonedStream.getTracks()[idx];\n        track.addEventListener('enabled', function(event) {\n          clonedTrack.enabled = event.enabled;\n        });\n      });\n      clonedStream.getTracks().forEach(function(track) {\n        pc.addTrack(track, clonedStream);\n      });\n    }\n  };\n\n  RTCPeerConnection.prototype.removeTrack = function(sender) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call removeTrack on a closed peerconnection.');\n    }\n\n    if (!(sender instanceof window.RTCRtpSender)) {\n      throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' +\n          'does not implement interface RTCRtpSender.');\n    }\n\n    var transceiver = this.transceivers.find(function(t) {\n      return t.rtpSender === sender;\n    });\n\n    if (!transceiver) {\n      throw makeError('InvalidAccessError',\n          'Sender was not created by this connection.');\n    }\n    var stream = transceiver.stream;\n\n    transceiver.rtpSender.stop();\n    transceiver.rtpSender = null;\n    transceiver.track = null;\n    transceiver.stream = null;\n\n    // remove the stream from the set of local streams\n    var localStreams = this.transceivers.map(function(t) {\n      return t.stream;\n    });\n    if (localStreams.indexOf(stream) === -1 &&\n        this.localStreams.indexOf(stream) > -1) {\n      this.localStreams.splice(this.localStreams.indexOf(stream), 1);\n    }\n\n    this._maybeFireNegotiationNeeded();\n  };\n\n  RTCPeerConnection.prototype.removeStream = function(stream) {\n    var pc = this;\n    stream.getTracks().forEach(function(track) {\n      var sender = pc.getSenders().find(function(s) {\n        return s.track === track;\n      });\n      if (sender) {\n        pc.removeTrack(sender);\n      }\n    });\n  };\n\n  RTCPeerConnection.prototype.getSenders = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpSender;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpSender;\n    });\n  };\n\n  RTCPeerConnection.prototype.getReceivers = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpReceiver;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpReceiver;\n    });\n  };\n\n\n  RTCPeerConnection.prototype._createIceGatherer = function(sdpMLineIndex,\n      usingBundle) {\n    var pc = this;\n    if (usingBundle && sdpMLineIndex > 0) {\n      return this.transceivers[0].iceGatherer;\n    } else if (this._iceGatherers.length) {\n      return this._iceGatherers.shift();\n    }\n    var iceGatherer = new window.RTCIceGatherer({\n      iceServers: this._config.iceServers,\n      gatherPolicy: this._config.iceTransportPolicy\n    });\n    Object.defineProperty(iceGatherer, 'state',\n        {value: 'new', writable: true}\n    );\n\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];\n    this.transceivers[sdpMLineIndex].bufferCandidates = function(event) {\n      var end = !event.candidate || Object.keys(event.candidate).length === 0;\n      // polyfill since RTCIceGatherer.state is not implemented in\n      // Edge 10547 yet.\n      iceGatherer.state = end ? 'completed' : 'gathering';\n      if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {\n        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);\n      }\n    };\n    iceGatherer.addEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    return iceGatherer;\n  };\n\n  // start gathering from an RTCIceGatherer.\n  RTCPeerConnection.prototype._gather = function(mid, sdpMLineIndex) {\n    var pc = this;\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer.onlocalcandidate) {\n      return;\n    }\n    var bufferedCandidateEvents =\n      this.transceivers[sdpMLineIndex].bufferedCandidateEvents;\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;\n    iceGatherer.removeEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    iceGatherer.onlocalcandidate = function(evt) {\n      if (pc.usingBundle && sdpMLineIndex > 0) {\n        // if we know that we use bundle we can drop candidates with\n        // ѕdpMLineIndex > 0. If we don't do this then our state gets\n        // confused since we dispose the extra ice gatherer.\n        return;\n      }\n      var event = new Event('icecandidate');\n      event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};\n\n      var cand = evt.candidate;\n      // Edge emits an empty object for RTCIceCandidateComplete‥\n      var end = !cand || Object.keys(cand).length === 0;\n      if (end) {\n        // polyfill since RTCIceGatherer.state is not implemented in\n        // Edge 10547 yet.\n        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {\n          iceGatherer.state = 'completed';\n        }\n      } else {\n        if (iceGatherer.state === 'new') {\n          iceGatherer.state = 'gathering';\n        }\n        // RTCIceCandidate doesn't have a component, needs to be added\n        cand.component = 1;\n        // also the usernameFragment. TODO: update SDP to take both variants.\n        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;\n\n        var serializedCandidate = SDPUtils.writeCandidate(cand);\n        event.candidate = Object.assign(event.candidate,\n            SDPUtils.parseCandidate(serializedCandidate));\n\n        event.candidate.candidate = serializedCandidate;\n        event.candidate.toJSON = function() {\n          return {\n            candidate: event.candidate.candidate,\n            sdpMid: event.candidate.sdpMid,\n            sdpMLineIndex: event.candidate.sdpMLineIndex,\n            usernameFragment: event.candidate.usernameFragment\n          };\n        };\n      }\n\n      // update local description.\n      var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);\n      if (!end) {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=' + event.candidate.candidate + '\\r\\n';\n      } else {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=end-of-candidates\\r\\n';\n      }\n      pc._localDescription.sdp =\n          SDPUtils.getDescription(pc._localDescription.sdp) +\n          sections.join('');\n      var complete = pc.transceivers.every(function(transceiver) {\n        return transceiver.iceGatherer &&\n            transceiver.iceGatherer.state === 'completed';\n      });\n\n      if (pc.iceGatheringState !== 'gathering') {\n        pc.iceGatheringState = 'gathering';\n        pc._emitGatheringStateChange();\n      }\n\n      // Emit candidate. Also emit null candidate when all gatherers are\n      // complete.\n      if (!end) {\n        pc._dispatchEvent('icecandidate', event);\n      }\n      if (complete) {\n        pc._dispatchEvent('icecandidate', new Event('icecandidate'));\n        pc.iceGatheringState = 'complete';\n        pc._emitGatheringStateChange();\n      }\n    };\n\n    // emit already gathered candidates.\n    window.setTimeout(function() {\n      bufferedCandidateEvents.forEach(function(e) {\n        iceGatherer.onlocalcandidate(e);\n      });\n    }, 0);\n  };\n\n  // Create ICE transport and DTLS transport.\n  RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {\n    var pc = this;\n    var iceTransport = new window.RTCIceTransport(null);\n    iceTransport.onicestatechange = function() {\n      pc._updateIceConnectionState();\n      pc._updateConnectionState();\n    };\n\n    var dtlsTransport = new window.RTCDtlsTransport(iceTransport);\n    dtlsTransport.ondtlsstatechange = function() {\n      pc._updateConnectionState();\n    };\n    dtlsTransport.onerror = function() {\n      // onerror does not set state to failed by itself.\n      Object.defineProperty(dtlsTransport, 'state',\n          {value: 'failed', writable: true});\n      pc._updateConnectionState();\n    };\n\n    return {\n      iceTransport: iceTransport,\n      dtlsTransport: dtlsTransport\n    };\n  };\n\n  // Destroy ICE gatherer, ICE transport and DTLS transport.\n  // Without triggering the callbacks.\n  RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(\n      sdpMLineIndex) {\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer) {\n      delete iceGatherer.onlocalcandidate;\n      delete this.transceivers[sdpMLineIndex].iceGatherer;\n    }\n    var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;\n    if (iceTransport) {\n      delete iceTransport.onicestatechange;\n      delete this.transceivers[sdpMLineIndex].iceTransport;\n    }\n    var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;\n    if (dtlsTransport) {\n      delete dtlsTransport.ondtlsstatechange;\n      delete dtlsTransport.onerror;\n      delete this.transceivers[sdpMLineIndex].dtlsTransport;\n    }\n  };\n\n  // Start the RTP Sender and Receiver for a transceiver.\n  RTCPeerConnection.prototype._transceive = function(transceiver,\n      send, recv) {\n    var params = getCommonCapabilities(transceiver.localCapabilities,\n        transceiver.remoteCapabilities);\n    if (send && transceiver.rtpSender) {\n      params.encodings = transceiver.sendEncodingParameters;\n      params.rtcp = {\n        cname: SDPUtils.localCName,\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.recvEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpSender.send(params);\n    }\n    if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {\n      // remove RTX field in Edge 14942\n      if (transceiver.kind === 'video'\n          && transceiver.recvEncodingParameters\n          && edgeVersion < 15019) {\n        transceiver.recvEncodingParameters.forEach(function(p) {\n          delete p.rtx;\n        });\n      }\n      if (transceiver.recvEncodingParameters.length) {\n        params.encodings = transceiver.recvEncodingParameters;\n      } else {\n        params.encodings = [{}];\n      }\n      params.rtcp = {\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.rtcpParameters.cname) {\n        params.rtcp.cname = transceiver.rtcpParameters.cname;\n      }\n      if (transceiver.sendEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpReceiver.receive(params);\n    }\n  };\n\n  RTCPeerConnection.prototype.setLocalDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setLocalDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set local ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var sections;\n    var sessionpart;\n    if (description.type === 'offer') {\n      // VERY limited support for SDP munging. Limited to:\n      // * changing the order of codecs\n      sections = SDPUtils.splitSections(description.sdp);\n      sessionpart = sections.shift();\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var caps = SDPUtils.parseRtpParameters(mediaSection);\n        pc.transceivers[sdpMLineIndex].localCapabilities = caps;\n      });\n\n      pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n        pc._gather(transceiver.mid, sdpMLineIndex);\n      });\n    } else if (description.type === 'answer') {\n      sections = SDPUtils.splitSections(pc._remoteDescription.sdp);\n      sessionpart = sections.shift();\n      var isIceLite = SDPUtils.matchPrefix(sessionpart,\n          'a=ice-lite').length > 0;\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        var iceGatherer = transceiver.iceGatherer;\n        var iceTransport = transceiver.iceTransport;\n        var dtlsTransport = transceiver.dtlsTransport;\n        var localCapabilities = transceiver.localCapabilities;\n        var remoteCapabilities = transceiver.remoteCapabilities;\n\n        // treat bundle-only as not-rejected.\n        var rejected = SDPUtils.isRejected(mediaSection) &&\n            SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n\n        if (!rejected && !transceiver.rejected) {\n          var remoteIceParameters = SDPUtils.getIceParameters(\n              mediaSection, sessionpart);\n          var remoteDtlsParameters = SDPUtils.getDtlsParameters(\n              mediaSection, sessionpart);\n          if (isIceLite) {\n            remoteDtlsParameters.role = 'server';\n          }\n\n          if (!pc.usingBundle || sdpMLineIndex === 0) {\n            pc._gather(transceiver.mid, sdpMLineIndex);\n            if (iceTransport.state === 'new') {\n              iceTransport.start(iceGatherer, remoteIceParameters,\n                  isIceLite ? 'controlling' : 'controlled');\n            }\n            if (dtlsTransport.state === 'new') {\n              dtlsTransport.start(remoteDtlsParameters);\n            }\n          }\n\n          // Calculate intersection of capabilities.\n          var params = getCommonCapabilities(localCapabilities,\n              remoteCapabilities);\n\n          // Start the RTCRtpSender. The RTCRtpReceiver for this\n          // transceiver has already been started in setRemoteDescription.\n          pc._transceive(transceiver,\n              params.codecs.length > 0,\n              false);\n        }\n      });\n    }\n\n    pc._localDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-local-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.setRemoteDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setRemoteDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set remote ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var streams = {};\n    pc.remoteStreams.forEach(function(stream) {\n      streams[stream.id] = stream;\n    });\n    var receiverList = [];\n    var sections = SDPUtils.splitSections(description.sdp);\n    var sessionpart = sections.shift();\n    var isIceLite = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-lite').length > 0;\n    var usingBundle = SDPUtils.matchPrefix(sessionpart,\n        'a=group:BUNDLE ').length > 0;\n    pc.usingBundle = usingBundle;\n    var iceOptions = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-options:')[0];\n    if (iceOptions) {\n      pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ')\n          .indexOf('trickle') >= 0;\n    } else {\n      pc.canTrickleIceCandidates = false;\n    }\n\n    sections.forEach(function(mediaSection, sdpMLineIndex) {\n      var lines = SDPUtils.splitLines(mediaSection);\n      var kind = SDPUtils.getKind(mediaSection);\n      // treat bundle-only as not-rejected.\n      var rejected = SDPUtils.isRejected(mediaSection) &&\n          SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n      var protocol = lines[0].substr(2).split(' ')[2];\n\n      var direction = SDPUtils.getDirection(mediaSection, sessionpart);\n      var remoteMsid = SDPUtils.parseMsid(mediaSection);\n\n      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();\n\n      // Reject datachannels which are not implemented yet.\n      if (rejected || (kind === 'application' && (protocol === 'DTLS/SCTP' ||\n          protocol === 'UDP/DTLS/SCTP'))) {\n        // TODO: this is dangerous in the case where a non-rejected m-line\n        //     becomes rejected.\n        pc.transceivers[sdpMLineIndex] = {\n          mid: mid,\n          kind: kind,\n          protocol: protocol,\n          rejected: true\n        };\n        return;\n      }\n\n      if (!rejected && pc.transceivers[sdpMLineIndex] &&\n          pc.transceivers[sdpMLineIndex].rejected) {\n        // recycle a rejected transceiver.\n        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);\n      }\n\n      var transceiver;\n      var iceGatherer;\n      var iceTransport;\n      var dtlsTransport;\n      var rtpReceiver;\n      var sendEncodingParameters;\n      var recvEncodingParameters;\n      var localCapabilities;\n\n      var track;\n      // FIXME: ensure the mediaSection has rtcp-mux set.\n      var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);\n      var remoteIceParameters;\n      var remoteDtlsParameters;\n      if (!rejected) {\n        remoteIceParameters = SDPUtils.getIceParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters.role = 'client';\n      }\n      recvEncodingParameters =\n          SDPUtils.parseRtpEncodingParameters(mediaSection);\n\n      var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);\n\n      var isComplete = SDPUtils.matchPrefix(mediaSection,\n          'a=end-of-candidates', sessionpart).length > 0;\n      var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')\n          .map(function(cand) {\n            return SDPUtils.parseCandidate(cand);\n          })\n          .filter(function(cand) {\n            return cand.component === 1;\n          });\n\n      // Check if we can use BUNDLE and dispose transports.\n      if ((description.type === 'offer' || description.type === 'answer') &&\n          !rejected && usingBundle && sdpMLineIndex > 0 &&\n          pc.transceivers[sdpMLineIndex]) {\n        pc._disposeIceAndDtlsTransports(sdpMLineIndex);\n        pc.transceivers[sdpMLineIndex].iceGatherer =\n            pc.transceivers[0].iceGatherer;\n        pc.transceivers[sdpMLineIndex].iceTransport =\n            pc.transceivers[0].iceTransport;\n        pc.transceivers[sdpMLineIndex].dtlsTransport =\n            pc.transceivers[0].dtlsTransport;\n        if (pc.transceivers[sdpMLineIndex].rtpSender) {\n          pc.transceivers[sdpMLineIndex].rtpSender.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {\n          pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n      }\n      if (description.type === 'offer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex] ||\n            pc._createTransceiver(kind);\n        transceiver.mid = mid;\n\n        if (!transceiver.iceGatherer) {\n          transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n              usingBundle);\n        }\n\n        if (cands.length && transceiver.iceTransport.state === 'new') {\n          if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {\n            transceiver.iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);\n\n        // filter RTX until additional stuff needed for RTX is implemented\n        // in adapter.js\n        if (edgeVersion < 15019) {\n          localCapabilities.codecs = localCapabilities.codecs.filter(\n              function(codec) {\n                return codec.name !== 'rtx';\n              });\n        }\n\n        sendEncodingParameters = transceiver.sendEncodingParameters || [{\n          ssrc: (2 * sdpMLineIndex + 2) * 1001\n        }];\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        var isNewTrack = false;\n        if (direction === 'sendrecv' || direction === 'sendonly') {\n          isNewTrack = !transceiver.rtpReceiver;\n          rtpReceiver = transceiver.rtpReceiver ||\n              new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);\n\n          if (isNewTrack) {\n            var stream;\n            track = rtpReceiver.track;\n            // FIXME: does not work with Plan B.\n            if (remoteMsid && remoteMsid.stream === '-') {\n              // no-op. a stream id of '-' means: no associated stream.\n            } else if (remoteMsid) {\n              if (!streams[remoteMsid.stream]) {\n                streams[remoteMsid.stream] = new window.MediaStream();\n                Object.defineProperty(streams[remoteMsid.stream], 'id', {\n                  get: function() {\n                    return remoteMsid.stream;\n                  }\n                });\n              }\n              Object.defineProperty(track, 'id', {\n                get: function() {\n                  return remoteMsid.track;\n                }\n              });\n              stream = streams[remoteMsid.stream];\n            } else {\n              if (!streams.default) {\n                streams.default = new window.MediaStream();\n              }\n              stream = streams.default;\n            }\n            if (stream) {\n              addTrackToStreamAndFireEvent(track, stream);\n              transceiver.associatedRemoteMediaStreams.push(stream);\n            }\n            receiverList.push([track, rtpReceiver, stream]);\n          }\n        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {\n          transceiver.associatedRemoteMediaStreams.forEach(function(s) {\n            var nativeTrack = s.getTracks().find(function(t) {\n              return t.id === transceiver.rtpReceiver.track.id;\n            });\n            if (nativeTrack) {\n              removeTrackFromStreamAndFireEvent(nativeTrack, s);\n            }\n          });\n          transceiver.associatedRemoteMediaStreams = [];\n        }\n\n        transceiver.localCapabilities = localCapabilities;\n        transceiver.remoteCapabilities = remoteCapabilities;\n        transceiver.rtpReceiver = rtpReceiver;\n        transceiver.rtcpParameters = rtcpParameters;\n        transceiver.sendEncodingParameters = sendEncodingParameters;\n        transceiver.recvEncodingParameters = recvEncodingParameters;\n\n        // Start the RTCRtpReceiver now. The RTPSender is started in\n        // setLocalDescription.\n        pc._transceive(pc.transceivers[sdpMLineIndex],\n            false,\n            isNewTrack);\n      } else if (description.type === 'answer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex];\n        iceGatherer = transceiver.iceGatherer;\n        iceTransport = transceiver.iceTransport;\n        dtlsTransport = transceiver.dtlsTransport;\n        rtpReceiver = transceiver.rtpReceiver;\n        sendEncodingParameters = transceiver.sendEncodingParameters;\n        localCapabilities = transceiver.localCapabilities;\n\n        pc.transceivers[sdpMLineIndex].recvEncodingParameters =\n            recvEncodingParameters;\n        pc.transceivers[sdpMLineIndex].remoteCapabilities =\n            remoteCapabilities;\n        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;\n\n        if (cands.length && iceTransport.state === 'new') {\n          if ((isIceLite || isComplete) &&\n              (!usingBundle || sdpMLineIndex === 0)) {\n            iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        if (!usingBundle || sdpMLineIndex === 0) {\n          if (iceTransport.state === 'new') {\n            iceTransport.start(iceGatherer, remoteIceParameters,\n                'controlling');\n          }\n          if (dtlsTransport.state === 'new') {\n            dtlsTransport.start(remoteDtlsParameters);\n          }\n        }\n\n        // If the offer contained RTX but the answer did not,\n        // remove RTX from sendEncodingParameters.\n        var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n        var hasRtx = commonCapabilities.codecs.filter(function(c) {\n          return c.name.toLowerCase() === 'rtx';\n        }).length;\n        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n          delete transceiver.sendEncodingParameters[0].rtx;\n        }\n\n        pc._transceive(transceiver,\n            direction === 'sendrecv' || direction === 'recvonly',\n            direction === 'sendrecv' || direction === 'sendonly');\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        if (rtpReceiver &&\n            (direction === 'sendrecv' || direction === 'sendonly')) {\n          track = rtpReceiver.track;\n          if (remoteMsid) {\n            if (!streams[remoteMsid.stream]) {\n              streams[remoteMsid.stream] = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);\n            receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);\n          } else {\n            if (!streams.default) {\n              streams.default = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams.default);\n            receiverList.push([track, rtpReceiver, streams.default]);\n          }\n        } else {\n          // FIXME: actually the receiver should be created later.\n          delete transceiver.rtpReceiver;\n        }\n      }\n    });\n\n    if (pc._dtlsRole === undefined) {\n      pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';\n    }\n\n    pc._remoteDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-remote-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n    Object.keys(streams).forEach(function(sid) {\n      var stream = streams[sid];\n      if (stream.getTracks().length) {\n        if (pc.remoteStreams.indexOf(stream) === -1) {\n          pc.remoteStreams.push(stream);\n          var event = new Event('addstream');\n          event.stream = stream;\n          window.setTimeout(function() {\n            pc._dispatchEvent('addstream', event);\n          });\n        }\n\n        receiverList.forEach(function(item) {\n          var track = item[0];\n          var receiver = item[1];\n          if (stream.id !== item[2].id) {\n            return;\n          }\n          fireAddTrack(pc, track, receiver, [stream]);\n        });\n      }\n    });\n    receiverList.forEach(function(item) {\n      if (item[2]) {\n        return;\n      }\n      fireAddTrack(pc, item[0], item[1], []);\n    });\n\n    // check whether addIceCandidate({}) was called within four seconds after\n    // setRemoteDescription.\n    window.setTimeout(function() {\n      if (!(pc && pc.transceivers)) {\n        return;\n      }\n      pc.transceivers.forEach(function(transceiver) {\n        if (transceiver.iceTransport &&\n            transceiver.iceTransport.state === 'new' &&\n            transceiver.iceTransport.getRemoteCandidates().length > 0) {\n          console.warn('Timeout for addRemoteCandidate. Consider sending ' +\n              'an end-of-candidates notification');\n          transceiver.iceTransport.addRemoteCandidate({});\n        }\n      });\n    }, 4000);\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.close = function() {\n    this.transceivers.forEach(function(transceiver) {\n      /* not yet\n      if (transceiver.iceGatherer) {\n        transceiver.iceGatherer.close();\n      }\n      */\n      if (transceiver.iceTransport) {\n        transceiver.iceTransport.stop();\n      }\n      if (transceiver.dtlsTransport) {\n        transceiver.dtlsTransport.stop();\n      }\n      if (transceiver.rtpSender) {\n        transceiver.rtpSender.stop();\n      }\n      if (transceiver.rtpReceiver) {\n        transceiver.rtpReceiver.stop();\n      }\n    });\n    // FIXME: clean up tracks, local streams, remote streams, etc\n    this._isClosed = true;\n    this._updateSignalingState('closed');\n  };\n\n  // Update the signaling state.\n  RTCPeerConnection.prototype._updateSignalingState = function(newState) {\n    this.signalingState = newState;\n    var event = new Event('signalingstatechange');\n    this._dispatchEvent('signalingstatechange', event);\n  };\n\n  // Determine whether to fire the negotiationneeded event.\n  RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {\n    var pc = this;\n    if (this.signalingState !== 'stable' || this.needNegotiation === true) {\n      return;\n    }\n    this.needNegotiation = true;\n    window.setTimeout(function() {\n      if (pc.needNegotiation) {\n        pc.needNegotiation = false;\n        var event = new Event('negotiationneeded');\n        pc._dispatchEvent('negotiationneeded', event);\n      }\n    }, 0);\n  };\n\n  // Update the ice connection state.\n  RTCPeerConnection.prototype._updateIceConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      checking: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n      }\n    });\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.checking > 0) {\n      newState = 'checking';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    } else if (states.completed > 0) {\n      newState = 'completed';\n    }\n\n    if (newState !== this.iceConnectionState) {\n      this.iceConnectionState = newState;\n      var event = new Event('iceconnectionstatechange');\n      this._dispatchEvent('iceconnectionstatechange', event);\n    }\n  };\n\n  // Update the connection state.\n  RTCPeerConnection.prototype._updateConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      connecting: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && transceiver.dtlsTransport &&\n          !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n        states[transceiver.dtlsTransport.state]++;\n      }\n    });\n    // ICETransport.completed and connected are the same for this purpose.\n    states.connected += states.completed;\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.connecting > 0) {\n      newState = 'connecting';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    }\n\n    if (newState !== this.connectionState) {\n      this.connectionState = newState;\n      var event = new Event('connectionstatechange');\n      this._dispatchEvent('connectionstatechange', event);\n    }\n  };\n\n  RTCPeerConnection.prototype.createOffer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createOffer after close'));\n    }\n\n    var numAudioTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'audio';\n    }).length;\n    var numVideoTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'video';\n    }).length;\n\n    // Determine number of audio and video tracks we need to send/recv.\n    var offerOptions = arguments[0];\n    if (offerOptions) {\n      // Reject Chrome legacy constraints.\n      if (offerOptions.mandatory || offerOptions.optional) {\n        throw new TypeError(\n            'Legacy mandatory/optional constraints not supported.');\n      }\n      if (offerOptions.offerToReceiveAudio !== undefined) {\n        if (offerOptions.offerToReceiveAudio === true) {\n          numAudioTracks = 1;\n        } else if (offerOptions.offerToReceiveAudio === false) {\n          numAudioTracks = 0;\n        } else {\n          numAudioTracks = offerOptions.offerToReceiveAudio;\n        }\n      }\n      if (offerOptions.offerToReceiveVideo !== undefined) {\n        if (offerOptions.offerToReceiveVideo === true) {\n          numVideoTracks = 1;\n        } else if (offerOptions.offerToReceiveVideo === false) {\n          numVideoTracks = 0;\n        } else {\n          numVideoTracks = offerOptions.offerToReceiveVideo;\n        }\n      }\n    }\n\n    pc.transceivers.forEach(function(transceiver) {\n      if (transceiver.kind === 'audio') {\n        numAudioTracks--;\n        if (numAudioTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      } else if (transceiver.kind === 'video') {\n        numVideoTracks--;\n        if (numVideoTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      }\n    });\n\n    // Create M-lines for recvonly streams.\n    while (numAudioTracks > 0 || numVideoTracks > 0) {\n      if (numAudioTracks > 0) {\n        pc._createTransceiver('audio');\n        numAudioTracks--;\n      }\n      if (numVideoTracks > 0) {\n        pc._createTransceiver('video');\n        numVideoTracks--;\n      }\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      // For each track, create an ice gatherer, ice transport,\n      // dtls transport, potentially rtpsender and rtpreceiver.\n      var track = transceiver.track;\n      var kind = transceiver.kind;\n      var mid = transceiver.mid || SDPUtils.generateIdentifier();\n      transceiver.mid = mid;\n\n      if (!transceiver.iceGatherer) {\n        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n            pc.usingBundle);\n      }\n\n      var localCapabilities = window.RTCRtpSender.getCapabilities(kind);\n      // filter RTX until additional stuff needed for RTX is implemented\n      // in adapter.js\n      if (edgeVersion < 15019) {\n        localCapabilities.codecs = localCapabilities.codecs.filter(\n            function(codec) {\n              return codec.name !== 'rtx';\n            });\n      }\n      localCapabilities.codecs.forEach(function(codec) {\n        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552\n        // by adding level-asymmetry-allowed=1\n        if (codec.name === 'H264' &&\n            codec.parameters['level-asymmetry-allowed'] === undefined) {\n          codec.parameters['level-asymmetry-allowed'] = '1';\n        }\n\n        // for subsequent offers, we might have to re-use the payload\n        // type of the last offer.\n        if (transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.codecs) {\n          transceiver.remoteCapabilities.codecs.forEach(function(remoteCodec) {\n            if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() &&\n                codec.clockRate === remoteCodec.clockRate) {\n              codec.preferredPayloadType = remoteCodec.payloadType;\n            }\n          });\n        }\n      });\n      localCapabilities.headerExtensions.forEach(function(hdrExt) {\n        var remoteExtensions = transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.headerExtensions || [];\n        remoteExtensions.forEach(function(rHdrExt) {\n          if (hdrExt.uri === rHdrExt.uri) {\n            hdrExt.id = rHdrExt.id;\n          }\n        });\n      });\n\n      // generate an ssrc now, to be used later in rtpSender.send\n      var sendEncodingParameters = transceiver.sendEncodingParameters || [{\n        ssrc: (2 * sdpMLineIndex + 1) * 1001\n      }];\n      if (track) {\n        // add RTX\n        if (edgeVersion >= 15019 && kind === 'video' &&\n            !sendEncodingParameters[0].rtx) {\n          sendEncodingParameters[0].rtx = {\n            ssrc: sendEncodingParameters[0].ssrc + 1\n          };\n        }\n      }\n\n      if (transceiver.wantReceive) {\n        transceiver.rtpReceiver = new window.RTCRtpReceiver(\n            transceiver.dtlsTransport, kind);\n      }\n\n      transceiver.localCapabilities = localCapabilities;\n      transceiver.sendEncodingParameters = sendEncodingParameters;\n    });\n\n    // always offer BUNDLE and dispose on return if not supported.\n    if (pc._config.bundlePolicy !== 'max-compat') {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      sdp += writeMediaSection(transceiver, transceiver.localCapabilities,\n          'offer', transceiver.stream, pc._dtlsRole);\n      sdp += 'a=rtcp-rsize\\r\\n';\n\n      if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' &&\n          (sdpMLineIndex === 0 || !pc.usingBundle)) {\n        transceiver.iceGatherer.getLocalCandidates().forEach(function(cand) {\n          cand.component = 1;\n          sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\\r\\n';\n        });\n\n        if (transceiver.iceGatherer.state === 'completed') {\n          sdp += 'a=end-of-candidates\\r\\n';\n        }\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'offer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.createAnswer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer after close'));\n    }\n\n    if (!(pc.signalingState === 'have-remote-offer' ||\n        pc.signalingState === 'have-local-pranswer')) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer in signalingState ' + pc.signalingState));\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    if (pc.usingBundle) {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    var mediaSectionsInOffer = SDPUtils.getMediaSections(\n        pc._remoteDescription.sdp).length;\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      if (sdpMLineIndex + 1 > mediaSectionsInOffer) {\n        return;\n      }\n      if (transceiver.rejected) {\n        if (transceiver.kind === 'application') {\n          if (transceiver.protocol === 'DTLS/SCTP') { // legacy fmt\n            sdp += 'm=application 0 DTLS/SCTP 5000\\r\\n';\n          } else {\n            sdp += 'm=application 0 ' + transceiver.protocol +\n                ' webrtc-datachannel\\r\\n';\n          }\n        } else if (transceiver.kind === 'audio') {\n          sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\\r\\n' +\n              'a=rtpmap:0 PCMU/8000\\r\\n';\n        } else if (transceiver.kind === 'video') {\n          sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\\r\\n' +\n              'a=rtpmap:120 VP8/90000\\r\\n';\n        }\n        sdp += 'c=IN IP4 0.0.0.0\\r\\n' +\n            'a=inactive\\r\\n' +\n            'a=mid:' + transceiver.mid + '\\r\\n';\n        return;\n      }\n\n      // FIXME: look at direction.\n      if (transceiver.stream) {\n        var localTrack;\n        if (transceiver.kind === 'audio') {\n          localTrack = transceiver.stream.getAudioTracks()[0];\n        } else if (transceiver.kind === 'video') {\n          localTrack = transceiver.stream.getVideoTracks()[0];\n        }\n        if (localTrack) {\n          // add RTX\n          if (edgeVersion >= 15019 && transceiver.kind === 'video' &&\n              !transceiver.sendEncodingParameters[0].rtx) {\n            transceiver.sendEncodingParameters[0].rtx = {\n              ssrc: transceiver.sendEncodingParameters[0].ssrc + 1\n            };\n          }\n        }\n      }\n\n      // Calculate intersection of capabilities.\n      var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n      var hasRtx = commonCapabilities.codecs.filter(function(c) {\n        return c.name.toLowerCase() === 'rtx';\n      }).length;\n      if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n        delete transceiver.sendEncodingParameters[0].rtx;\n      }\n\n      sdp += writeMediaSection(transceiver, commonCapabilities,\n          'answer', transceiver.stream, pc._dtlsRole);\n      if (transceiver.rtcpParameters &&\n          transceiver.rtcpParameters.reducedSize) {\n        sdp += 'a=rtcp-rsize\\r\\n';\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'answer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.addIceCandidate = function(candidate) {\n    var pc = this;\n    var sections;\n    if (candidate && !(candidate.sdpMLineIndex !== undefined ||\n        candidate.sdpMid)) {\n      return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));\n    }\n\n    // TODO: needs to go into ops queue.\n    return new Promise(function(resolve, reject) {\n      if (!pc._remoteDescription) {\n        return reject(makeError('InvalidStateError',\n            'Can not add ICE candidate without a remote description'));\n      } else if (!candidate || candidate.candidate === '') {\n        for (var j = 0; j < pc.transceivers.length; j++) {\n          if (pc.transceivers[j].rejected) {\n            continue;\n          }\n          pc.transceivers[j].iceTransport.addRemoteCandidate({});\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[j] += 'a=end-of-candidates\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n          if (pc.usingBundle) {\n            break;\n          }\n        }\n      } else {\n        var sdpMLineIndex = candidate.sdpMLineIndex;\n        if (candidate.sdpMid) {\n          for (var i = 0; i < pc.transceivers.length; i++) {\n            if (pc.transceivers[i].mid === candidate.sdpMid) {\n              sdpMLineIndex = i;\n              break;\n            }\n          }\n        }\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        if (transceiver) {\n          if (transceiver.rejected) {\n            return resolve();\n          }\n          var cand = Object.keys(candidate.candidate).length > 0 ?\n              SDPUtils.parseCandidate(candidate.candidate) : {};\n          // Ignore Chrome's invalid candidates since Edge does not like them.\n          if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {\n            return resolve();\n          }\n          // Ignore RTCP candidates, we assume RTCP-MUX.\n          if (cand.component && cand.component !== 1) {\n            return resolve();\n          }\n          // when using bundle, avoid adding candidates to the wrong\n          // ice transport. And avoid adding candidates added in the SDP.\n          if (sdpMLineIndex === 0 || (sdpMLineIndex > 0 &&\n              transceiver.iceTransport !== pc.transceivers[0].iceTransport)) {\n            if (!maybeAddCandidate(transceiver.iceTransport, cand)) {\n              return reject(makeError('OperationError',\n                  'Can not add ICE candidate'));\n            }\n          }\n\n          // update the remoteDescription.\n          var candidateString = candidate.candidate.trim();\n          if (candidateString.indexOf('a=') === 0) {\n            candidateString = candidateString.substr(2);\n          }\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[sdpMLineIndex] += 'a=' +\n              (cand.type ? candidateString : 'end-of-candidates')\n              + '\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n        } else {\n          return reject(makeError('OperationError',\n              'Can not add ICE candidate'));\n        }\n      }\n      resolve();\n    });\n  };\n\n  RTCPeerConnection.prototype.getStats = function(selector) {\n    if (selector && selector instanceof window.MediaStreamTrack) {\n      var senderOrReceiver = null;\n      this.transceivers.forEach(function(transceiver) {\n        if (transceiver.rtpSender &&\n            transceiver.rtpSender.track === selector) {\n          senderOrReceiver = transceiver.rtpSender;\n        } else if (transceiver.rtpReceiver &&\n            transceiver.rtpReceiver.track === selector) {\n          senderOrReceiver = transceiver.rtpReceiver;\n        }\n      });\n      if (!senderOrReceiver) {\n        throw makeError('InvalidAccessError', 'Invalid selector.');\n      }\n      return senderOrReceiver.getStats();\n    }\n\n    var promises = [];\n    this.transceivers.forEach(function(transceiver) {\n      ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',\n          'dtlsTransport'].forEach(function(method) {\n            if (transceiver[method]) {\n              promises.push(transceiver[method].getStats());\n            }\n          });\n    });\n    return Promise.all(promises).then(function(allStats) {\n      var results = new Map();\n      allStats.forEach(function(stats) {\n        stats.forEach(function(stat) {\n          results.set(stat.id, stat);\n        });\n      });\n      return results;\n    });\n  };\n\n  // fix low-level stat names and return Map instead of object.\n  var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer',\n    'RTCIceTransport', 'RTCDtlsTransport'];\n  ortcObjects.forEach(function(ortcObjectName) {\n    var obj = window[ortcObjectName];\n    if (obj && obj.prototype && obj.prototype.getStats) {\n      var nativeGetstats = obj.prototype.getStats;\n      obj.prototype.getStats = function() {\n        return nativeGetstats.apply(this)\n        .then(function(nativeStats) {\n          var mapStats = new Map();\n          Object.keys(nativeStats).forEach(function(id) {\n            nativeStats[id].type = fixStatsType(nativeStats[id]);\n            mapStats.set(id, nativeStats[id]);\n          });\n          return mapStats;\n        });\n      };\n    }\n  });\n\n  // legacy callback shims. Should be moved to adapter.js some days.\n  var methods = ['createOffer', 'createAnswer'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[0] === 'function' ||\n          typeof args[1] === 'function') { // legacy\n        return nativeMethod.apply(this, [arguments[2]])\n        .then(function(description) {\n          if (typeof args[0] === 'function') {\n            args[0].apply(null, [description]);\n          }\n        }, function(error) {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function' ||\n          typeof args[2] === 'function') { // legacy\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        }, function(error) {\n          if (typeof args[2] === 'function') {\n            args[2].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  // getStats is special. It doesn't have a spec legacy method yet we support\n  // getStats(something, cb) without error callbacks.\n  ['getStats'].forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function') {\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  return RTCPeerConnection;\n};\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  const shimError_ = function(e) {\n    return {\n      name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint,\n      toString() {\n        return this.name;\n      }\n    };\n  };\n\n  // getUserMedia error shim.\n  const origGetUserMedia = navigator.mediaDevices.getUserMedia.\n      bind(navigator.mediaDevices);\n  navigator.mediaDevices.getUserMedia = function(c) {\n    return origGetUserMedia(c).catch(e => Promise.reject(shimError_(e)));\n  };\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nexport function shimGetDisplayMedia(window) {\n  if (!('getDisplayMedia' in window.navigator)) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    window.navigator.getDisplayMedia.bind(window.navigator);\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\nimport {filterIceServers} from './filtericeservers';\nimport shimRTCPeerConnection from 'rtcpeerconnection-shim';\n\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimPeerConnection(window, browserDetails) {\n  if (window.RTCIceGatherer) {\n    if (!window.RTCIceCandidate) {\n      window.RTCIceCandidate = function RTCIceCandidate(args) {\n        return args;\n      };\n    }\n    if (!window.RTCSessionDescription) {\n      window.RTCSessionDescription = function RTCSessionDescription(args) {\n        return args;\n      };\n    }\n    // this adds an additional event listener to MediaStrackTrack that signals\n    // when a tracks enabled property was changed. Workaround for a bug in\n    // addStream, see below. No longer required in 15025+\n    if (browserDetails.version < 15025) {\n      const origMSTEnabled = Object.getOwnPropertyDescriptor(\n          window.MediaStreamTrack.prototype, 'enabled');\n      Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {\n        set(value) {\n          origMSTEnabled.set.call(this, value);\n          const ev = new Event('enabled');\n          ev.enabled = value;\n          this.dispatchEvent(ev);\n        }\n      });\n    }\n  }\n\n  // ORTC defines the DTMF sender a bit different.\n  // https://github.com/w3c/ortc/issues/714\n  if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = new window.RTCDtmfSender(this);\n          } else if (this.track.kind === 'video') {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n  // Edge currently only implements the RTCDtmfSender, not the\n  // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*\n  if (window.RTCDtmfSender && !window.RTCDTMFSender) {\n    window.RTCDTMFSender = window.RTCDtmfSender;\n  }\n\n  const RTCPeerConnectionShim = shimRTCPeerConnection(window,\n      browserDetails.version);\n  window.RTCPeerConnection = function RTCPeerConnection(config) {\n    if (config && config.iceServers) {\n      config.iceServers = filterIceServers(config.iceServers,\n        browserDetails.version);\n      utils.log('ICE servers after filtering:', config.iceServers);\n    }\n    return new RTCPeerConnectionShim(config);\n  };\n  window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;\n}\n\nexport function shimReplaceTrack(window) {\n  // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614\n  if (window.RTCRtpSender &&\n      !('replaceTrack' in window.RTCRtpSender.prototype)) {\n    window.RTCRtpSender.prototype.replaceTrack =\n        window.RTCRtpSender.prototype.setTrack;\n  }\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\n\nexport function shimGetUserMedia(window, browserDetails) {\n  const navigator = window && window.navigator;\n  const MediaStreamTrack = window && window.MediaStreamTrack;\n\n  navigator.getUserMedia = function(constraints, onSuccess, onError) {\n    // Replace Firefox 44+'s deprecation warning with unprefixed version.\n    utils.deprecated('navigator.getUserMedia',\n        'navigator.mediaDevices.getUserMedia');\n    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);\n  };\n\n  if (!(browserDetails.version > 55 &&\n      'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {\n    const remap = function(obj, a, b) {\n      if (a in obj && !(b in obj)) {\n        obj[b] = obj[a];\n        delete obj[a];\n      }\n    };\n\n    const nativeGetUserMedia = navigator.mediaDevices.getUserMedia.\n        bind(navigator.mediaDevices);\n    navigator.mediaDevices.getUserMedia = function(c) {\n      if (typeof c === 'object' && typeof c.audio === 'object') {\n        c = JSON.parse(JSON.stringify(c));\n        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');\n        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');\n      }\n      return nativeGetUserMedia(c);\n    };\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {\n      const nativeGetSettings = MediaStreamTrack.prototype.getSettings;\n      MediaStreamTrack.prototype.getSettings = function() {\n        const obj = nativeGetSettings.apply(this, arguments);\n        remap(obj, 'mozAutoGainControl', 'autoGainControl');\n        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');\n        return obj;\n      };\n    }\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {\n      const nativeApplyConstraints =\n        MediaStreamTrack.prototype.applyConstraints;\n      MediaStreamTrack.prototype.applyConstraints = function(c) {\n        if (this.kind === 'audio' && typeof c === 'object') {\n          c = JSON.parse(JSON.stringify(c));\n          remap(c, 'autoGainControl', 'mozAutoGainControl');\n          remap(c, 'noiseSuppression', 'mozNoiseSuppression');\n        }\n        return nativeApplyConstraints.apply(this, [c]);\n      };\n    }\n  }\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nexport function shimGetDisplayMedia(window, preferredMediaSource) {\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    function getDisplayMedia(constraints) {\n      if (!(constraints && constraints.video)) {\n        const err = new DOMException('getDisplayMedia without video ' +\n            'constraints is undefined');\n        err.name = 'NotFoundError';\n        // from https://heycam.github.io/webidl/#idl-DOMException-error-names\n        err.code = 8;\n        return Promise.reject(err);\n      }\n      if (constraints.video === true) {\n        constraints.video = {mediaSource: preferredMediaSource};\n      } else {\n        constraints.video.mediaSource = preferredMediaSource;\n      }\n      return window.navigator.mediaDevices.getUserMedia(constraints);\n    };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimOnTrack(window) {\n  if (typeof window === 'object' && window.RTCTrackEvent &&\n      ('receiver' in window.RTCTrackEvent.prototype) &&\n      !('transceiver' in window.RTCTrackEvent.prototype)) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get() {\n        return {receiver: this.receiver};\n      }\n    });\n  }\n}\n\nexport function shimPeerConnection(window, browserDetails) {\n  if (typeof window !== 'object' ||\n      !(window.RTCPeerConnection || window.mozRTCPeerConnection)) {\n    return; // probably media.peerconnection.enabled=false in about:config\n  }\n  if (!window.RTCPeerConnection && window.mozRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.mozRTCPeerConnection;\n  }\n\n  if (browserDetails.version < 53) {\n    // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.\n    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n        .forEach(function(method) {\n          const nativeMethod = window.RTCPeerConnection.prototype[method];\n          const methodObj = {[method]() {\n            arguments[0] = new ((method === 'addIceCandidate') ?\n                window.RTCIceCandidate :\n                window.RTCSessionDescription)(arguments[0]);\n            return nativeMethod.apply(this, arguments);\n          }};\n          window.RTCPeerConnection.prototype[method] = methodObj[method];\n        });\n  }\n\n  const modernStatsTypes = {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  };\n\n  const nativeGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    const [selector, onSucc, onErr] = arguments;\n    return nativeGetStats.apply(this, [selector || null])\n      .then(stats => {\n        if (browserDetails.version < 53 && !onSucc) {\n          // Shim only promise getStats with spec-hyphens in type names\n          // Leave callback version alone; misc old uses of forEach before Map\n          try {\n            stats.forEach(stat => {\n              stat.type = modernStatsTypes[stat.type] || stat.type;\n            });\n          } catch (e) {\n            if (e.name !== 'TypeError') {\n              throw e;\n            }\n            // Avoid TypeError: \"type\" is read-only, in old versions. 34-43ish\n            stats.forEach((stat, i) => {\n              stats.set(i, Object.assign({}, stat, {\n                type: modernStatsTypes[stat.type] || stat.type\n              }));\n            });\n          }\n        }\n        return stats;\n      })\n      .then(onSucc, onErr);\n  };\n}\n\nexport function shimSenderGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {\n    return;\n  }\n  const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n  if (origGetSenders) {\n    window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n      const senders = origGetSenders.apply(this, []);\n      senders.forEach(sender => sender._pc = this);\n      return senders;\n    };\n  }\n\n  const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  if (origAddTrack) {\n    window.RTCPeerConnection.prototype.addTrack = function addTrack() {\n      const sender = origAddTrack.apply(this, arguments);\n      sender._pc = this;\n      return sender;\n    };\n  }\n  window.RTCRtpSender.prototype.getStats = function getStats() {\n    return this.track ? this._pc.getStats(this.track) :\n        Promise.resolve(new Map());\n  };\n}\n\nexport function shimReceiverGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {\n    return;\n  }\n  const origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n  if (origGetReceivers) {\n    window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {\n      const receivers = origGetReceivers.apply(this, []);\n      receivers.forEach(receiver => receiver._pc = this);\n      return receivers;\n    };\n  }\n  utils.wrapPeerConnectionEvent(window, 'track', e => {\n    e.receiver._pc = e.srcElement;\n    return e;\n  });\n  window.RTCRtpReceiver.prototype.getStats = function getStats() {\n    return this._pc.getStats(this.track);\n  };\n}\n\nexport function shimRemoveStream(window) {\n  if (!window.RTCPeerConnection ||\n      'removeStream' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  window.RTCPeerConnection.prototype.removeStream =\n    function removeStream(stream) {\n      utils.deprecated('removeStream', 'removeTrack');\n      this.getSenders().forEach(sender => {\n        if (sender.track && stream.getTracks().includes(sender.track)) {\n          this.removeTrack(sender);\n        }\n      });\n    };\n}\n\nexport function shimRTCDataChannel(window) {\n  // rename DataChannel to RTCDataChannel (native fix in FF60):\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851\n  if (window.DataChannel && !window.RTCDataChannel) {\n    window.RTCDataChannel = window.DataChannel;\n  }\n}\n\nexport function shimAddTransceiver(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!(typeof window === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  const origAddTransceiver = window.RTCPeerConnection.prototype.addTransceiver;\n  if (origAddTransceiver) {\n    window.RTCPeerConnection.prototype.addTransceiver =\n      function addTransceiver() {\n        this.setParametersPromises = [];\n        const initParameters = arguments[1];\n        const shouldPerformCheck = initParameters &&\n                                  'sendEncodings' in initParameters;\n        if (shouldPerformCheck) {\n          // If sendEncodings params are provided, validate grammar\n          initParameters.sendEncodings.forEach((encodingParam) => {\n            if ('rid' in encodingParam) {\n              const ridRegex = /^[a-z0-9]{0,16}$/i;\n              if (!ridRegex.test(encodingParam.rid)) {\n                throw new TypeError('Invalid RID value provided.');\n              }\n            }\n            if ('scaleResolutionDownBy' in encodingParam) {\n              if (!(parseFloat(encodingParam.scaleResolutionDownBy) >= 1.0)) {\n                throw new RangeError('scale_resolution_down_by must be >= 1.0');\n              }\n            }\n            if ('maxFramerate' in encodingParam) {\n              if (!(parseFloat(encodingParam.maxFramerate) >= 0)) {\n                throw new RangeError('max_framerate must be >= 0.0');\n              }\n            }\n          });\n        }\n        const transceiver = origAddTransceiver.apply(this, arguments);\n        if (shouldPerformCheck) {\n          // Check if the init options were applied. If not we do this in an\n          // asynchronous way and save the promise reference in a global object.\n          // This is an ugly hack, but at the same time is way more robust than\n          // checking the sender parameters before and after the createOffer\n          // Also note that after the createoffer we are not 100% sure that\n          // the params were asynchronously applied so we might miss the\n          // opportunity to recreate offer.\n          const {sender} = transceiver;\n          const params = sender.getParameters();\n          if (!('encodings' in params) ||\n              // Avoid being fooled by patched getParameters() below.\n              (params.encodings.length === 1 &&\n               Object.keys(params.encodings[0]).length === 0)) {\n            params.encodings = initParameters.sendEncodings;\n            sender.sendEncodings = initParameters.sendEncodings;\n            this.setParametersPromises.push(sender.setParameters(params)\n              .then(() => {\n                delete sender.sendEncodings;\n              }).catch(() => {\n                delete sender.sendEncodings;\n              })\n            );\n          }\n        }\n        return transceiver;\n      };\n  }\n}\n\nexport function shimGetParameters(window) {\n  if (!(typeof window === 'object' && window.RTCRtpSender)) {\n    return;\n  }\n  const origGetParameters = window.RTCRtpSender.prototype.getParameters;\n  if (origGetParameters) {\n    window.RTCRtpSender.prototype.getParameters =\n      function getParameters() {\n        const params = origGetParameters.apply(this, arguments);\n        if (!('encodings' in params)) {\n          params.encodings = [].concat(this.sendEncodings || [{}]);\n        }\n        return params;\n      };\n  }\n}\n\nexport function shimCreateOffer(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!(typeof window === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  const origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n  window.RTCPeerConnection.prototype.createOffer = function createOffer() {\n    if (this.setParametersPromises && this.setParametersPromises.length) {\n      return Promise.all(this.setParametersPromises)\n      .then(() => {\n        return origCreateOffer.apply(this, arguments);\n      })\n      .finally(() => {\n        this.setParametersPromises = [];\n      });\n    }\n    return origCreateOffer.apply(this, arguments);\n  };\n}\n\nexport function shimCreateAnswer(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!(typeof window === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  const origCreateAnswer = window.RTCPeerConnection.prototype.createAnswer;\n  window.RTCPeerConnection.prototype.createAnswer = function createAnswer() {\n    if (this.setParametersPromises && this.setParametersPromises.length) {\n      return Promise.all(this.setParametersPromises)\n      .then(() => {\n        return origCreateAnswer.apply(this, arguments);\n      })\n      .finally(() => {\n        this.setParametersPromises = [];\n      });\n    }\n    return origCreateAnswer.apply(this, arguments);\n  };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n'use strict';\nimport * as utils from '../utils';\n\nexport function shimLocalStreamsAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getLocalStreams =\n      function getLocalStreams() {\n        if (!this._localStreams) {\n          this._localStreams = [];\n        }\n        return this._localStreams;\n      };\n  }\n  if (!('addStream' in window.RTCPeerConnection.prototype)) {\n    const _addTrack = window.RTCPeerConnection.prototype.addTrack;\n    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      if (!this._localStreams.includes(stream)) {\n        this._localStreams.push(stream);\n      }\n      // Try to emulate Chrome's behaviour of adding in audio-video order.\n      // Safari orders by track id.\n      stream.getAudioTracks().forEach(track => _addTrack.call(this, track,\n        stream));\n      stream.getVideoTracks().forEach(track => _addTrack.call(this, track,\n        stream));\n    };\n\n    window.RTCPeerConnection.prototype.addTrack =\n      function addTrack(track, ...streams) {\n        if (streams) {\n          streams.forEach((stream) => {\n            if (!this._localStreams) {\n              this._localStreams = [stream];\n            } else if (!this._localStreams.includes(stream)) {\n              this._localStreams.push(stream);\n            }\n          });\n        }\n        return _addTrack.apply(this, arguments);\n      };\n  }\n  if (!('removeStream' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.removeStream =\n      function removeStream(stream) {\n        if (!this._localStreams) {\n          this._localStreams = [];\n        }\n        const index = this._localStreams.indexOf(stream);\n        if (index === -1) {\n          return;\n        }\n        this._localStreams.splice(index, 1);\n        const tracks = stream.getTracks();\n        this.getSenders().forEach(sender => {\n          if (tracks.includes(sender.track)) {\n            this.removeTrack(sender);\n          }\n        });\n      };\n  }\n}\n\nexport function shimRemoteStreamsAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getRemoteStreams =\n      function getRemoteStreams() {\n        return this._remoteStreams ? this._remoteStreams : [];\n      };\n  }\n  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {\n      get() {\n        return this._onaddstream;\n      },\n      set(f) {\n        if (this._onaddstream) {\n          this.removeEventListener('addstream', this._onaddstream);\n          this.removeEventListener('track', this._onaddstreampoly);\n        }\n        this.addEventListener('addstream', this._onaddstream = f);\n        this.addEventListener('track', this._onaddstreampoly = (e) => {\n          e.streams.forEach(stream => {\n            if (!this._remoteStreams) {\n              this._remoteStreams = [];\n            }\n            if (this._remoteStreams.includes(stream)) {\n              return;\n            }\n            this._remoteStreams.push(stream);\n            const event = new Event('addstream');\n            event.stream = stream;\n            this.dispatchEvent(event);\n          });\n        });\n      }\n    });\n    const origSetRemoteDescription =\n      window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription =\n      function setRemoteDescription() {\n        const pc = this;\n        if (!this._onaddstreampoly) {\n          this.addEventListener('track', this._onaddstreampoly = function(e) {\n            e.streams.forEach(stream => {\n              if (!pc._remoteStreams) {\n                pc._remoteStreams = [];\n              }\n              if (pc._remoteStreams.indexOf(stream) >= 0) {\n                return;\n              }\n              pc._remoteStreams.push(stream);\n              const event = new Event('addstream');\n              event.stream = stream;\n              pc.dispatchEvent(event);\n            });\n          });\n        }\n        return origSetRemoteDescription.apply(pc, arguments);\n      };\n  }\n}\n\nexport function shimCallbacksAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  const prototype = window.RTCPeerConnection.prototype;\n  const origCreateOffer = prototype.createOffer;\n  const origCreateAnswer = prototype.createAnswer;\n  const setLocalDescription = prototype.setLocalDescription;\n  const setRemoteDescription = prototype.setRemoteDescription;\n  const addIceCandidate = prototype.addIceCandidate;\n\n  prototype.createOffer =\n    function createOffer(successCallback, failureCallback) {\n      const options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n      const promise = origCreateOffer.apply(this, [options]);\n      if (!failureCallback) {\n        return promise;\n      }\n      promise.then(successCallback, failureCallback);\n      return Promise.resolve();\n    };\n\n  prototype.createAnswer =\n    function createAnswer(successCallback, failureCallback) {\n      const options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n      const promise = origCreateAnswer.apply(this, [options]);\n      if (!failureCallback) {\n        return promise;\n      }\n      promise.then(successCallback, failureCallback);\n      return Promise.resolve();\n    };\n\n  let withCallback = function(description, successCallback, failureCallback) {\n    const promise = setLocalDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setLocalDescription = withCallback;\n\n  withCallback = function(description, successCallback, failureCallback) {\n    const promise = setRemoteDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setRemoteDescription = withCallback;\n\n  withCallback = function(candidate, successCallback, failureCallback) {\n    const promise = addIceCandidate.apply(this, [candidate]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.addIceCandidate = withCallback;\n}\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {\n    // shim not needed in Safari 12.1\n    const mediaDevices = navigator.mediaDevices;\n    const _getUserMedia = mediaDevices.getUserMedia.bind(mediaDevices);\n    navigator.mediaDevices.getUserMedia = (constraints) => {\n      return _getUserMedia(shimConstraints(constraints));\n    };\n  }\n\n  if (!navigator.getUserMedia && navigator.mediaDevices &&\n    navigator.mediaDevices.getUserMedia) {\n    navigator.getUserMedia = function getUserMedia(constraints, cb, errcb) {\n      navigator.mediaDevices.getUserMedia(constraints)\n      .then(cb, errcb);\n    }.bind(navigator);\n  }\n}\n\nexport function shimConstraints(constraints) {\n  if (constraints && constraints.video !== undefined) {\n    return Object.assign({},\n      constraints,\n      {video: utils.compactObject(constraints.video)}\n    );\n  }\n\n  return constraints;\n}\n\nexport function shimRTCIceServerUrls(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  // migrate from non-spec RTCIceServer.url to RTCIceServer.urls\n  const OrigPeerConnection = window.RTCPeerConnection;\n  window.RTCPeerConnection =\n    function RTCPeerConnection(pcConfig, pcConstraints) {\n      if (pcConfig && pcConfig.iceServers) {\n        const newIceServers = [];\n        for (let i = 0; i < pcConfig.iceServers.length; i++) {\n          let server = pcConfig.iceServers[i];\n          if (!server.hasOwnProperty('urls') &&\n              server.hasOwnProperty('url')) {\n            utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n            server = JSON.parse(JSON.stringify(server));\n            server.urls = server.url;\n            delete server.url;\n            newIceServers.push(server);\n          } else {\n            newIceServers.push(pcConfig.iceServers[i]);\n          }\n        }\n        pcConfig.iceServers = newIceServers;\n      }\n      return new OrigPeerConnection(pcConfig, pcConstraints);\n    };\n  window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;\n  // wrap static methods. Currently just generateCertificate.\n  if ('generateCertificate' in OrigPeerConnection) {\n    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n      get() {\n        return OrigPeerConnection.generateCertificate;\n      }\n    });\n  }\n}\n\nexport function shimTrackEventTransceiver(window) {\n  // Add event.transceiver member over deprecated event.receiver\n  if (typeof window === 'object' && window.RTCTrackEvent &&\n      'receiver' in window.RTCTrackEvent.prototype &&\n      !('transceiver' in window.RTCTrackEvent.prototype)) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get() {\n        return {receiver: this.receiver};\n      }\n    });\n  }\n}\n\nexport function shimCreateOfferLegacy(window) {\n  const origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n  window.RTCPeerConnection.prototype.createOffer =\n    function createOffer(offerOptions) {\n      if (offerOptions) {\n        if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {\n          // support bit values\n          offerOptions.offerToReceiveAudio =\n            !!offerOptions.offerToReceiveAudio;\n        }\n        const audioTransceiver = this.getTransceivers().find(transceiver =>\n          transceiver.receiver.track.kind === 'audio');\n        if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {\n          if (audioTransceiver.direction === 'sendrecv') {\n            if (audioTransceiver.setDirection) {\n              audioTransceiver.setDirection('sendonly');\n            } else {\n              audioTransceiver.direction = 'sendonly';\n            }\n          } else if (audioTransceiver.direction === 'recvonly') {\n            if (audioTransceiver.setDirection) {\n              audioTransceiver.setDirection('inactive');\n            } else {\n              audioTransceiver.direction = 'inactive';\n            }\n          }\n        } else if (offerOptions.offerToReceiveAudio === true &&\n            !audioTransceiver) {\n          this.addTransceiver('audio');\n        }\n\n        if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {\n          // support bit values\n          offerOptions.offerToReceiveVideo =\n            !!offerOptions.offerToReceiveVideo;\n        }\n        const videoTransceiver = this.getTransceivers().find(transceiver =>\n          transceiver.receiver.track.kind === 'video');\n        if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {\n          if (videoTransceiver.direction === 'sendrecv') {\n            if (videoTransceiver.setDirection) {\n              videoTransceiver.setDirection('sendonly');\n            } else {\n              videoTransceiver.direction = 'sendonly';\n            }\n          } else if (videoTransceiver.direction === 'recvonly') {\n            if (videoTransceiver.setDirection) {\n              videoTransceiver.setDirection('inactive');\n            } else {\n              videoTransceiver.direction = 'inactive';\n            }\n          }\n        } else if (offerOptions.offerToReceiveVideo === true &&\n            !videoTransceiver) {\n          this.addTransceiver('video');\n        }\n      }\n      return origCreateOffer.apply(this, arguments);\n    };\n}\n\nexport function shimAudioContext(window) {\n  if (typeof window !== 'object' || window.AudioContext) {\n    return;\n  }\n  window.AudioContext = window.webkitAudioContext;\n}\n","/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport SDPUtils from 'sdp';\nimport * as utils from './utils';\n\nexport function shimRTCIceCandidate(window) {\n  // foundation is arbitrarily chosen as an indicator for full support for\n  // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface\n  if (!window.RTCIceCandidate || (window.RTCIceCandidate && 'foundation' in\n      window.RTCIceCandidate.prototype)) {\n    return;\n  }\n\n  const NativeRTCIceCandidate = window.RTCIceCandidate;\n  window.RTCIceCandidate = function RTCIceCandidate(args) {\n    // Remove the a= which shouldn't be part of the candidate string.\n    if (typeof args === 'object' && args.candidate &&\n        args.candidate.indexOf('a=') === 0) {\n      args = JSON.parse(JSON.stringify(args));\n      args.candidate = args.candidate.substr(2);\n    }\n\n    if (args.candidate && args.candidate.length) {\n      // Augment the native candidate with the parsed fields.\n      const nativeCandidate = new NativeRTCIceCandidate(args);\n      const parsedCandidate = SDPUtils.parseCandidate(args.candidate);\n      const augmentedCandidate = Object.assign(nativeCandidate,\n          parsedCandidate);\n\n      // Add a serializer that does not serialize the extra attributes.\n      augmentedCandidate.toJSON = function toJSON() {\n        return {\n          candidate: augmentedCandidate.candidate,\n          sdpMid: augmentedCandidate.sdpMid,\n          sdpMLineIndex: augmentedCandidate.sdpMLineIndex,\n          usernameFragment: augmentedCandidate.usernameFragment,\n        };\n      };\n      return augmentedCandidate;\n    }\n    return new NativeRTCIceCandidate(args);\n  };\n  window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype;\n\n  // Hook up the augmented candidate in onicecandidate and\n  // addEventListener('icecandidate', ...)\n  utils.wrapPeerConnectionEvent(window, 'icecandidate', e => {\n    if (e.candidate) {\n      Object.defineProperty(e, 'candidate', {\n        value: new window.RTCIceCandidate(e.candidate),\n        writable: 'false'\n      });\n    }\n    return e;\n  });\n}\n\nexport function shimMaxMessageSize(window, browserDetails) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  if (!('sctp' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {\n      get() {\n        return typeof this._sctp === 'undefined' ? null : this._sctp;\n      }\n    });\n  }\n\n  const sctpInDescription = function(description) {\n    if (!description || !description.sdp) {\n      return false;\n    }\n    const sections = SDPUtils.splitSections(description.sdp);\n    sections.shift();\n    return sections.some(mediaSection => {\n      const mLine = SDPUtils.parseMLine(mediaSection);\n      return mLine && mLine.kind === 'application'\n          && mLine.protocol.indexOf('SCTP') !== -1;\n    });\n  };\n\n  const getRemoteFirefoxVersion = function(description) {\n    // TODO: Is there a better solution for detecting Firefox?\n    const match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\\d+)/);\n    if (match === null || match.length < 2) {\n      return -1;\n    }\n    const version = parseInt(match[1], 10);\n    // Test for NaN (yes, this is ugly)\n    return version !== version ? -1 : version;\n  };\n\n  const getCanSendMaxMessageSize = function(remoteIsFirefox) {\n    // Every implementation we know can send at least 64 KiB.\n    // Note: Although Chrome is technically able to send up to 256 KiB, the\n    //       data does not reach the other peer reliably.\n    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419\n    let canSendMaxMessageSize = 65536;\n    if (browserDetails.browser === 'firefox') {\n      if (browserDetails.version < 57) {\n        if (remoteIsFirefox === -1) {\n          // FF < 57 will send in 16 KiB chunks using the deprecated PPID\n          // fragmentation.\n          canSendMaxMessageSize = 16384;\n        } else {\n          // However, other FF (and RAWRTC) can reassemble PPID-fragmented\n          // messages. Thus, supporting ~2 GiB when sending.\n          canSendMaxMessageSize = 2147483637;\n        }\n      } else if (browserDetails.version < 60) {\n        // Currently, all FF >= 57 will reset the remote maximum message size\n        // to the default value when a data channel is created at a later\n        // stage. :(\n        // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n        canSendMaxMessageSize =\n          browserDetails.version === 57 ? 65535 : 65536;\n      } else {\n        // FF >= 60 supports sending ~2 GiB\n        canSendMaxMessageSize = 2147483637;\n      }\n    }\n    return canSendMaxMessageSize;\n  };\n\n  const getMaxMessageSize = function(description, remoteIsFirefox) {\n    // Note: 65536 bytes is the default value from the SDP spec. Also,\n    //       every implementation we know supports receiving 65536 bytes.\n    let maxMessageSize = 65536;\n\n    // FF 57 has a slightly incorrect default remote max message size, so\n    // we need to adjust it here to avoid a failure when sending.\n    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697\n    if (browserDetails.browser === 'firefox'\n         && browserDetails.version === 57) {\n      maxMessageSize = 65535;\n    }\n\n    const match = SDPUtils.matchPrefix(description.sdp,\n      'a=max-message-size:');\n    if (match.length > 0) {\n      maxMessageSize = parseInt(match[0].substr(19), 10);\n    } else if (browserDetails.browser === 'firefox' &&\n                remoteIsFirefox !== -1) {\n      // If the maximum message size is not present in the remote SDP and\n      // both local and remote are Firefox, the remote peer can receive\n      // ~2 GiB.\n      maxMessageSize = 2147483637;\n    }\n    return maxMessageSize;\n  };\n\n  const origSetRemoteDescription =\n      window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription =\n    function setRemoteDescription() {\n      this._sctp = null;\n      // Chrome decided to not expose .sctp in plan-b mode.\n      // As usual, adapter.js has to do an 'ugly worakaround'\n      // to cover up the mess.\n      if (browserDetails.browser === 'chrome' && browserDetails.version >= 76) {\n        const {sdpSemantics} = this.getConfiguration();\n        if (sdpSemantics === 'plan-b') {\n          Object.defineProperty(this, 'sctp', {\n            get() {\n              return typeof this._sctp === 'undefined' ? null : this._sctp;\n            },\n            enumerable: true,\n            configurable: true,\n          });\n        }\n      }\n\n      if (sctpInDescription(arguments[0])) {\n        // Check if the remote is FF.\n        const isFirefox = getRemoteFirefoxVersion(arguments[0]);\n\n        // Get the maximum message size the local peer is capable of sending\n        const canSendMMS = getCanSendMaxMessageSize(isFirefox);\n\n        // Get the maximum message size of the remote peer.\n        const remoteMMS = getMaxMessageSize(arguments[0], isFirefox);\n\n        // Determine final maximum message size\n        let maxMessageSize;\n        if (canSendMMS === 0 && remoteMMS === 0) {\n          maxMessageSize = Number.POSITIVE_INFINITY;\n        } else if (canSendMMS === 0 || remoteMMS === 0) {\n          maxMessageSize = Math.max(canSendMMS, remoteMMS);\n        } else {\n          maxMessageSize = Math.min(canSendMMS, remoteMMS);\n        }\n\n        // Create a dummy RTCSctpTransport object and the 'maxMessageSize'\n        // attribute.\n        const sctp = {};\n        Object.defineProperty(sctp, 'maxMessageSize', {\n          get() {\n            return maxMessageSize;\n          }\n        });\n        this._sctp = sctp;\n      }\n\n      return origSetRemoteDescription.apply(this, arguments);\n    };\n}\n\nexport function shimSendThrowTypeError(window) {\n  if (!(window.RTCPeerConnection &&\n      'createDataChannel' in window.RTCPeerConnection.prototype)) {\n    return;\n  }\n\n  // Note: Although Firefox >= 57 has a native implementation, the maximum\n  //       message size can be reset for all data channels at a later stage.\n  //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n\n  function wrapDcSend(dc, pc) {\n    const origDataChannelSend = dc.send;\n    dc.send = function send() {\n      const data = arguments[0];\n      const length = data.length || data.size || data.byteLength;\n      if (dc.readyState === 'open' &&\n          pc.sctp && length > pc.sctp.maxMessageSize) {\n        throw new TypeError('Message too large (can send a maximum of ' +\n          pc.sctp.maxMessageSize + ' bytes)');\n      }\n      return origDataChannelSend.apply(dc, arguments);\n    };\n  }\n  const origCreateDataChannel =\n    window.RTCPeerConnection.prototype.createDataChannel;\n  window.RTCPeerConnection.prototype.createDataChannel =\n    function createDataChannel() {\n      const dataChannel = origCreateDataChannel.apply(this, arguments);\n      wrapDcSend(dataChannel, this);\n      return dataChannel;\n    };\n  utils.wrapPeerConnectionEvent(window, 'datachannel', e => {\n    wrapDcSend(e.channel, e.target);\n    return e;\n  });\n}\n\n\n/* shims RTCConnectionState by pretending it is the same as iceConnectionState.\n * See https://bugs.chromium.org/p/webrtc/issues/detail?id=6145#c12\n * for why this is a valid hack in Chrome. In Firefox it is slightly incorrect\n * since DTLS failures would be hidden. See\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1265827\n * for the Firefox tracking bug.\n */\nexport function shimConnectionState(window) {\n  if (!window.RTCPeerConnection ||\n      'connectionState' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  const proto = window.RTCPeerConnection.prototype;\n  Object.defineProperty(proto, 'connectionState', {\n    get() {\n      return {\n        completed: 'connected',\n        checking: 'connecting'\n      }[this.iceConnectionState] || this.iceConnectionState;\n    },\n    enumerable: true,\n    configurable: true\n  });\n  Object.defineProperty(proto, 'onconnectionstatechange', {\n    get() {\n      return this._onconnectionstatechange || null;\n    },\n    set(cb) {\n      if (this._onconnectionstatechange) {\n        this.removeEventListener('connectionstatechange',\n            this._onconnectionstatechange);\n        delete this._onconnectionstatechange;\n      }\n      if (cb) {\n        this.addEventListener('connectionstatechange',\n            this._onconnectionstatechange = cb);\n      }\n    },\n    enumerable: true,\n    configurable: true\n  });\n\n  ['setLocalDescription', 'setRemoteDescription'].forEach((method) => {\n    const origMethod = proto[method];\n    proto[method] = function() {\n      if (!this._connectionstatechangepoly) {\n        this._connectionstatechangepoly = e => {\n          const pc = e.target;\n          if (pc._lastConnectionState !== pc.connectionState) {\n            pc._lastConnectionState = pc.connectionState;\n            const newEvent = new Event('connectionstatechange', e);\n            pc.dispatchEvent(newEvent);\n          }\n          return e;\n        };\n        this.addEventListener('iceconnectionstatechange',\n          this._connectionstatechangepoly);\n      }\n      return origMethod.apply(this, arguments);\n    };\n  });\n}\n\nexport function removeExtmapAllowMixed(window, browserDetails) {\n  /* remove a=extmap-allow-mixed for webrtc.org < M71 */\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  if (browserDetails.browser === 'chrome' && browserDetails.version >= 71) {\n    return;\n  }\n  if (browserDetails.browser === 'safari' && browserDetails.version >= 605) {\n    return;\n  }\n  const nativeSRD = window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription =\n  function setRemoteDescription(desc) {\n    if (desc && desc.sdp && desc.sdp.indexOf('\\na=extmap-allow-mixed') !== -1) {\n      const sdp = desc.sdp.split('\\n').filter((line) => {\n        return line.trim() !== 'a=extmap-allow-mixed';\n      }).join('\\n');\n      // Safari enforces read-only-ness of RTCSessionDescription fields.\n      if (window.RTCSessionDescription &&\n          desc instanceof window.RTCSessionDescription) {\n        arguments[0] = new window.RTCSessionDescription({\n          type: desc.type,\n          sdp,\n        });\n      } else {\n        desc.sdp = sdp;\n      }\n    }\n    return nativeSRD.apply(this, arguments);\n  };\n}\n\nexport function shimAddIceCandidateNullOrEmpty(window, browserDetails) {\n  // Support for addIceCandidate(null or undefined)\n  // as well as addIceCandidate({candidate: \"\", ...})\n  // https://bugs.chromium.org/p/chromium/issues/detail?id=978582\n  // Note: must be called before other polyfills which change the signature.\n  if (!(window.RTCPeerConnection && window.RTCPeerConnection.prototype)) {\n    return;\n  }\n  const nativeAddIceCandidate =\n      window.RTCPeerConnection.prototype.addIceCandidate;\n  if (!nativeAddIceCandidate || nativeAddIceCandidate.length === 0) {\n    return;\n  }\n  window.RTCPeerConnection.prototype.addIceCandidate =\n    function addIceCandidate() {\n      if (!arguments[0]) {\n        if (arguments[1]) {\n          arguments[1].apply(null);\n        }\n        return Promise.resolve();\n      }\n      // Firefox 68+ emits and processes {candidate: \"\", ...}, ignore\n      // in older versions.\n      // Native support for ignoring exists for Chrome M77+.\n      // Safari ignores as well, exact version unknown but works in the same\n      // version that also ignores addIceCandidate(null).\n      if (((browserDetails.browser === 'chrome' && browserDetails.version < 78)\n           || (browserDetails.browser === 'firefox'\n               && browserDetails.version < 68)\n           || (browserDetails.browser === 'safari'))\n          && arguments[0] && arguments[0].candidate === '') {\n        return Promise.resolve();\n      }\n      return nativeAddIceCandidate.apply(this, arguments);\n    };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\nimport * as utils from './utils';\n\n  // Browser shims.\nimport * as chromeShim from './chrome/chrome_shim';\nimport * as edgeShim from './edge/edge_shim';\nimport * as firefoxShim from './firefox/firefox_shim';\nimport * as safariShim from './safari/safari_shim';\nimport * as commonShim from './common_shim';\n\n// Shimming starts here.\nexport function adapterFactory({window} = {}, options = {\n  shimChrome: true,\n  shimFirefox: true,\n  shimEdge: true,\n  shimSafari: true,\n}) {\n  // Utils.\n  const logging = utils.log;\n  const browserDetails = utils.detectBrowser(window);\n\n  const adapter = {\n    browserDetails,\n    commonShim,\n    extractVersion: utils.extractVersion,\n    disableLog: utils.disableLog,\n    disableWarnings: utils.disableWarnings\n  };\n\n  // Shim browser if found.\n  switch (browserDetails.browser) {\n    case 'chrome':\n      if (!chromeShim || !chromeShim.shimPeerConnection ||\n          !options.shimChrome) {\n        logging('Chrome shim is not included in this adapter release.');\n        return adapter;\n      }\n      if (browserDetails.version === null) {\n        logging('Chrome shim can not determine version, not shimming.');\n        return adapter;\n      }\n      logging('adapter.js shimming chrome.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = chromeShim;\n\n      // Must be called before shimPeerConnection.\n      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);\n\n      chromeShim.shimGetUserMedia(window, browserDetails);\n      chromeShim.shimMediaStream(window, browserDetails);\n      chromeShim.shimPeerConnection(window, browserDetails);\n      chromeShim.shimOnTrack(window, browserDetails);\n      chromeShim.shimAddTrackRemoveTrack(window, browserDetails);\n      chromeShim.shimGetSendersWithDtmf(window, browserDetails);\n      chromeShim.shimGetStats(window, browserDetails);\n      chromeShim.shimSenderReceiverGetStats(window, browserDetails);\n      chromeShim.fixNegotiationNeeded(window, browserDetails);\n\n      commonShim.shimRTCIceCandidate(window, browserDetails);\n      commonShim.shimConnectionState(window, browserDetails);\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      commonShim.removeExtmapAllowMixed(window, browserDetails);\n      break;\n    case 'firefox':\n      if (!firefoxShim || !firefoxShim.shimPeerConnection ||\n          !options.shimFirefox) {\n        logging('Firefox shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming firefox.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = firefoxShim;\n\n      // Must be called before shimPeerConnection.\n      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);\n\n      firefoxShim.shimGetUserMedia(window, browserDetails);\n      firefoxShim.shimPeerConnection(window, browserDetails);\n      firefoxShim.shimOnTrack(window, browserDetails);\n      firefoxShim.shimRemoveStream(window, browserDetails);\n      firefoxShim.shimSenderGetStats(window, browserDetails);\n      firefoxShim.shimReceiverGetStats(window, browserDetails);\n      firefoxShim.shimRTCDataChannel(window, browserDetails);\n      firefoxShim.shimAddTransceiver(window, browserDetails);\n      firefoxShim.shimGetParameters(window, browserDetails);\n      firefoxShim.shimCreateOffer(window, browserDetails);\n      firefoxShim.shimCreateAnswer(window, browserDetails);\n\n      commonShim.shimRTCIceCandidate(window, browserDetails);\n      commonShim.shimConnectionState(window, browserDetails);\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      break;\n    case 'edge':\n      if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {\n        logging('MS edge shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming edge.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = edgeShim;\n\n      edgeShim.shimGetUserMedia(window, browserDetails);\n      edgeShim.shimGetDisplayMedia(window, browserDetails);\n      edgeShim.shimPeerConnection(window, browserDetails);\n      edgeShim.shimReplaceTrack(window, browserDetails);\n\n      // the edge shim implements the full RTCIceCandidate object.\n\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      break;\n    case 'safari':\n      if (!safariShim || !options.shimSafari) {\n        logging('Safari shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming safari.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = safariShim;\n\n      // Must be called before shimCallbackAPI.\n      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);\n\n      safariShim.shimRTCIceServerUrls(window, browserDetails);\n      safariShim.shimCreateOfferLegacy(window, browserDetails);\n      safariShim.shimCallbacksAPI(window, browserDetails);\n      safariShim.shimLocalStreamsAPI(window, browserDetails);\n      safariShim.shimRemoteStreamsAPI(window, browserDetails);\n      safariShim.shimTrackEventTransceiver(window, browserDetails);\n      safariShim.shimGetUserMedia(window, browserDetails);\n      safariShim.shimAudioContext(window, browserDetails);\n\n      commonShim.shimRTCIceCandidate(window, browserDetails);\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      commonShim.removeExtmapAllowMixed(window, browserDetails);\n      break;\n    default:\n      logging('Unsupported browser!');\n      break;\n  }\n\n  return adapter;\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n\n'use strict';\n\nimport {adapterFactory} from './adapter_factory.js';\n\nconst adapter =\n  adapterFactory({window: typeof window === 'undefined' ? undefined : window});\nexport default adapter;\n","import webRTCAdapter from \"webrtc-adapter\";\n\nexport { webRTCAdapter };\n","import { webRTCAdapter } from './adapter';\n\nexport const Supports = new class {\n  readonly isIOS = ['iPad', 'iPhone', 'iPod'].includes(navigator.platform);\n  readonly supportedBrowsers = ['firefox', 'chrome', 'safari'];\n\n  readonly minFirefoxVersion = 59;\n  readonly minChromeVersion = 72;\n  readonly minSafariVersion = 605;\n\n  isWebRTCSupported(): boolean {\n    return typeof RTCPeerConnection !== 'undefined';\n  }\n\n  isBrowserSupported(): boolean {\n    const browser = this.getBrowser();\n    const version = this.getVersion();\n\n    const validBrowser = this.supportedBrowsers.includes(browser);\n\n    if (!validBrowser) return false;\n\n    if (browser === 'chrome') return version >= this.minChromeVersion;\n    if (browser === 'firefox') return version >= this.minFirefoxVersion;\n    if (browser === 'safari') return !this.isIOS && version >= this.minSafariVersion;\n\n    return false;\n  }\n\n  getBrowser(): string {\n    return webRTCAdapter.browserDetails.browser;\n  }\n\n  getVersion(): number {\n    return webRTCAdapter.browserDetails.version || 0;\n  }\n\n  isUnifiedPlanSupported(): boolean {\n    const browser = this.getBrowser();\n    const version = webRTCAdapter.browserDetails.version || 0;\n\n    if (browser === 'chrome' && version < 72) return false;\n    if (browser === 'firefox' && version >= 59) return true;\n    if (!window.RTCRtpTransceiver || !('currentDirection' in RTCRtpTransceiver.prototype)) return false;\n\n    let tempPc: RTCPeerConnection;\n    let supported = false;\n\n    try {\n      tempPc = new RTCPeerConnection();\n      tempPc.addTransceiver('audio');\n      supported = true;\n    } catch (e) { }\n    finally {\n      if (tempPc) {\n        tempPc.close();\n      }\n    }\n\n    return supported;\n  }\n\n  toString(): string {\n    return `Supports: \n    browser:${this.getBrowser()} \n    version:${this.getVersion()} \n    isIOS:${this.isIOS} \n    isWebRTCSupported:${this.isWebRTCSupported()} \n    isBrowserSupported:${this.isBrowserSupported()} \n    isUnifiedPlanSupported:${this.isUnifiedPlanSupported()}`;\n  }\n}","import * as BinaryPack from \"peerjs-js-binarypack\";\nimport { Supports } from './supports';\nimport { UtilSupportsObj } from '..';\n\nconst DEFAULT_CONFIG = {\n  iceServers: [\n    { urls: \"stun:stun.l.google.com:19302\" },\n    { urls: \"turn:0.peerjs.com:3478\", username: \"peerjs\", credential: \"peerjsp\" }\n  ],\n  sdpSemantics: \"unified-plan\"\n};\n\nexport const util = new class {\n  noop(): void { }\n\n  readonly CLOUD_HOST = \"0.peerjs.com\";\n  readonly CLOUD_PORT = 443;\n\n  // Browsers that need chunking:\n  readonly chunkedBrowsers = { Chrome: 1, chrome: 1 };\n  readonly chunkedMTU = 16300; // The original 60000 bytes setting does not work when sending data from Firefox to Chrome, which is \"cut off\" after 16384 bytes and delivered individually.\n\n  // Returns browser-agnostic default config\n  readonly defaultConfig = DEFAULT_CONFIG;\n\n  readonly browser = Supports.getBrowser();\n  readonly browserVersion = Supports.getVersion();\n\n  // Lists which features are supported\n  readonly supports = (function () {\n    const supported: UtilSupportsObj = {\n      browser: Supports.isBrowserSupported(),\n      webRTC: Supports.isWebRTCSupported(),\n      audioVideo: false,\n      data: false,\n      binaryBlob: false,\n      reliable: false,\n    };\n\n    if (!supported.webRTC) return supported;\n\n    let pc: RTCPeerConnection;\n\n    try {\n      pc = new RTCPeerConnection(DEFAULT_CONFIG);\n\n      supported.audioVideo = true;\n\n      let dc: RTCDataChannel;\n\n      try {\n        dc = pc.createDataChannel(\"_PEERJSTEST\", { ordered: true });\n        supported.data = true;\n        supported.reliable = !!dc.ordered;\n\n        // Binary test\n        try {\n          dc.binaryType = \"blob\";\n          supported.binaryBlob = !Supports.isIOS;\n        } catch (e) {\n        }\n      } catch (e) {\n      } finally {\n        if (dc) {\n          dc.close();\n        }\n      }\n    } catch (e) {\n    } finally {\n      if (pc) {\n        pc.close();\n      }\n    }\n\n    return supported;\n  })();\n\n  // Ensure alphanumeric ids\n  validateId(id: string): boolean {\n    // Allow empty ids\n    return !id || /^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/.test(id);\n  }\n\n  pack = BinaryPack.pack;\n  unpack = BinaryPack.unpack;\n\n  // Binary stuff\n\n  private _dataCount: number = 1;\n\n  chunk(blob: Blob): { __peerData: number, n: number, total: number, data: Blob }[] {\n    const chunks = [];\n    const size = blob.size;\n    const total = Math.ceil(size / util.chunkedMTU);\n\n    let index = 0;\n    let start = 0;\n\n    while (start < size) {\n      const end = Math.min(size, start + util.chunkedMTU);\n      const b = blob.slice(start, end);\n\n      const chunk = {\n        __peerData: this._dataCount,\n        n: index,\n        data: b,\n        total,\n      };\n\n      chunks.push(chunk);\n\n      start = end;\n      index++;\n    }\n\n    this._dataCount++;\n\n    return chunks;\n  }\n\n  blobToArrayBuffer(blob: Blob, cb: (arg: ArrayBuffer | null) => void): FileReader {\n    const fr = new FileReader();\n\n    fr.onload = function (evt) {\n      if (evt.target) {\n        cb(evt.target.result as ArrayBuffer);\n      }\n    };\n\n    fr.readAsArrayBuffer(blob);\n\n    return fr;\n  }\n\n  binaryStringToArrayBuffer(binary: string): ArrayBuffer | SharedArrayBuffer {\n    const byteArray = new Uint8Array(binary.length);\n\n    for (let i = 0; i < binary.length; i++) {\n      byteArray[i] = binary.charCodeAt(i) & 0xff;\n    }\n\n    return byteArray.buffer;\n  }\n\n  randomToken(): string {\n    return Math.random()\n      .toString(36)\n      .substr(2);\n  }\n\n  isSecure(): boolean {\n    return location.protocol === \"https:\";\n  }\n}\n","'use strict';\n\nvar has = Object.prototype.hasOwnProperty\n  , prefix = '~';\n\n/**\n * Constructor to create a storage for our `EE` objects.\n * An `Events` instance is a plain object whose properties are event names.\n *\n * @constructor\n * @private\n */\nfunction Events() {}\n\n//\n// We try to not inherit from `Object.prototype`. In some engines creating an\n// instance in this way is faster than calling `Object.create(null)` directly.\n// If `Object.create(null)` is not supported we prefix the event names with a\n// character to make sure that the built-in object properties are not\n// overridden or used as an attack vector.\n//\nif (Object.create) {\n  Events.prototype = Object.create(null);\n\n  //\n  // This hack is needed because the `__proto__` property is still inherited in\n  // some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.\n  //\n  if (!new Events().__proto__) prefix = false;\n}\n\n/**\n * Representation of a single event listener.\n *\n * @param {Function} fn The listener function.\n * @param {*} context The context to invoke the listener with.\n * @param {Boolean} [once=false] Specify if the listener is a one-time listener.\n * @constructor\n * @private\n */\nfunction EE(fn, context, once) {\n  this.fn = fn;\n  this.context = context;\n  this.once = once || false;\n}\n\n/**\n * Add a listener for a given event.\n *\n * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn The listener function.\n * @param {*} context The context to invoke the listener with.\n * @param {Boolean} once Specify if the listener is a one-time listener.\n * @returns {EventEmitter}\n * @private\n */\nfunction addListener(emitter, event, fn, context, once) {\n  if (typeof fn !== 'function') {\n    throw new TypeError('The listener must be a function');\n  }\n\n  var listener = new EE(fn, context || emitter, once)\n    , evt = prefix ? prefix + event : event;\n\n  if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;\n  else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);\n  else emitter._events[evt] = [emitter._events[evt], listener];\n\n  return emitter;\n}\n\n/**\n * Clear event by name.\n *\n * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.\n * @param {(String|Symbol)} evt The Event name.\n * @private\n */\nfunction clearEvent(emitter, evt) {\n  if (--emitter._eventsCount === 0) emitter._events = new Events();\n  else delete emitter._events[evt];\n}\n\n/**\n * Minimal `EventEmitter` interface that is molded against the Node.js\n * `EventEmitter` interface.\n *\n * @constructor\n * @public\n */\nfunction EventEmitter() {\n  this._events = new Events();\n  this._eventsCount = 0;\n}\n\n/**\n * Return an array listing the events for which the emitter has registered\n * listeners.\n *\n * @returns {Array}\n * @public\n */\nEventEmitter.prototype.eventNames = function eventNames() {\n  var names = []\n    , events\n    , name;\n\n  if (this._eventsCount === 0) return names;\n\n  for (name in (events = this._events)) {\n    if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);\n  }\n\n  if (Object.getOwnPropertySymbols) {\n    return names.concat(Object.getOwnPropertySymbols(events));\n  }\n\n  return names;\n};\n\n/**\n * Return the listeners registered for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @returns {Array} The registered listeners.\n * @public\n */\nEventEmitter.prototype.listeners = function listeners(event) {\n  var evt = prefix ? prefix + event : event\n    , handlers = this._events[evt];\n\n  if (!handlers) return [];\n  if (handlers.fn) return [handlers.fn];\n\n  for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {\n    ee[i] = handlers[i].fn;\n  }\n\n  return ee;\n};\n\n/**\n * Return the number of listeners listening to a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @returns {Number} The number of listeners.\n * @public\n */\nEventEmitter.prototype.listenerCount = function listenerCount(event) {\n  var evt = prefix ? prefix + event : event\n    , listeners = this._events[evt];\n\n  if (!listeners) return 0;\n  if (listeners.fn) return 1;\n  return listeners.length;\n};\n\n/**\n * Calls each of the listeners registered for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @returns {Boolean} `true` if the event had listeners, else `false`.\n * @public\n */\nEventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {\n  var evt = prefix ? prefix + event : event;\n\n  if (!this._events[evt]) return false;\n\n  var listeners = this._events[evt]\n    , len = arguments.length\n    , args\n    , i;\n\n  if (listeners.fn) {\n    if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);\n\n    switch (len) {\n      case 1: return listeners.fn.call(listeners.context), true;\n      case 2: return listeners.fn.call(listeners.context, a1), true;\n      case 3: return listeners.fn.call(listeners.context, a1, a2), true;\n      case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;\n      case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;\n      case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;\n    }\n\n    for (i = 1, args = new Array(len -1); i < len; i++) {\n      args[i - 1] = arguments[i];\n    }\n\n    listeners.fn.apply(listeners.context, args);\n  } else {\n    var length = listeners.length\n      , j;\n\n    for (i = 0; i < length; i++) {\n      if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);\n\n      switch (len) {\n        case 1: listeners[i].fn.call(listeners[i].context); break;\n        case 2: listeners[i].fn.call(listeners[i].context, a1); break;\n        case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;\n        case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;\n        default:\n          if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {\n            args[j - 1] = arguments[j];\n          }\n\n          listeners[i].fn.apply(listeners[i].context, args);\n      }\n    }\n  }\n\n  return true;\n};\n\n/**\n * Add a listener for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn The listener function.\n * @param {*} [context=this] The context to invoke the listener with.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.on = function on(event, fn, context) {\n  return addListener(this, event, fn, context, false);\n};\n\n/**\n * Add a one-time listener for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn The listener function.\n * @param {*} [context=this] The context to invoke the listener with.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.once = function once(event, fn, context) {\n  return addListener(this, event, fn, context, true);\n};\n\n/**\n * Remove the listeners of a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn Only remove the listeners that match this function.\n * @param {*} context Only remove the listeners that have this context.\n * @param {Boolean} once Only remove one-time listeners.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {\n  var evt = prefix ? prefix + event : event;\n\n  if (!this._events[evt]) return this;\n  if (!fn) {\n    clearEvent(this, evt);\n    return this;\n  }\n\n  var listeners = this._events[evt];\n\n  if (listeners.fn) {\n    if (\n      listeners.fn === fn &&\n      (!once || listeners.once) &&\n      (!context || listeners.context === context)\n    ) {\n      clearEvent(this, evt);\n    }\n  } else {\n    for (var i = 0, events = [], length = listeners.length; i < length; i++) {\n      if (\n        listeners[i].fn !== fn ||\n        (once && !listeners[i].once) ||\n        (context && listeners[i].context !== context)\n      ) {\n        events.push(listeners[i]);\n      }\n    }\n\n    //\n    // Reset the array, or remove it completely if we have no more listeners.\n    //\n    if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;\n    else clearEvent(this, evt);\n  }\n\n  return this;\n};\n\n/**\n * Remove all listeners, or those of the specified event.\n *\n * @param {(String|Symbol)} [event] The event name.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {\n  var evt;\n\n  if (event) {\n    evt = prefix ? prefix + event : event;\n    if (this._events[evt]) clearEvent(this, evt);\n  } else {\n    this._events = new Events();\n    this._eventsCount = 0;\n  }\n\n  return this;\n};\n\n//\n// Alias methods names because people roll like that.\n//\nEventEmitter.prototype.off = EventEmitter.prototype.removeListener;\nEventEmitter.prototype.addListener = EventEmitter.prototype.on;\n\n//\n// Expose the prefix.\n//\nEventEmitter.prefixed = prefix;\n\n//\n// Allow `EventEmitter` to be imported as module namespace.\n//\nEventEmitter.EventEmitter = EventEmitter;\n\n//\n// Expose the module.\n//\nif ('undefined' !== typeof module) {\n  module.exports = EventEmitter;\n}\n","const LOG_PREFIX = 'PeerJS: ';\n\n/*\nPrints log messages depending on the debug level passed in. Defaults to 0.\n0  Prints no logs.\n1  Prints only errors.\n2  Prints errors and warnings.\n3  Prints all logs.\n*/\nexport enum LogLevel {\n    Disabled,\n    Errors,\n    Warnings,\n    All\n}\n\nclass Logger {\n    private _logLevel = LogLevel.Disabled;\n\n    get logLevel(): LogLevel { return this._logLevel; }\n\n    set logLevel(logLevel: LogLevel) { this._logLevel = logLevel; }\n\n    log(...args: any[]) {\n        if (this._logLevel >= LogLevel.All) {\n            this._print(LogLevel.All, ...args);\n        }\n    }\n\n    warn(...args: any[]) {\n        if (this._logLevel >= LogLevel.Warnings) {\n            this._print(LogLevel.Warnings, ...args);\n        }\n    }\n\n    error(...args: any[]) {\n        if (this._logLevel >= LogLevel.Errors) {\n            this._print(LogLevel.Errors, ...args);\n        }\n    }\n\n    setLogFunction(fn: (logLevel: LogLevel, ..._: any[]) => void): void {\n        this._print = fn;\n    }\n\n    private _print(logLevel: LogLevel, ...rest: any[]): void {\n        const copy = [LOG_PREFIX, ...rest];\n\n        for (let i in copy) {\n            if (copy[i] instanceof Error) {\n                copy[i] = \"(\" + copy[i].name + \") \" + copy[i].message;\n\n            }\n        }\n\n        if (logLevel >= LogLevel.All) {\n            console.log(...copy);\n        } else if (logLevel >= LogLevel.Warnings) {\n            console.warn(\"WARNING\", ...copy);\n        } else if (logLevel >= LogLevel.Errors) {\n            console.error(\"ERROR\", ...copy);\n        }\n    }\n}\n\nexport default new Logger();","export enum ConnectionEventType {\n  Open = \"open\",\n  Stream = \"stream\",\n  Data = \"data\",\n  Close = \"close\",\n  Error = \"error\",\n  IceStateChanged = \"iceStateChanged\"\n}\n\nexport enum ConnectionType {\n  Data = \"data\",\n  Media = \"media\"\n}\n\nexport enum PeerEventType {\n  Open = \"open\",\n  Close = \"close\",\n  Connection = \"connection\",\n  Call = \"call\",\n  Disconnected = \"disconnected\",\n  Error = \"error\"\n}\n\nexport enum PeerErrorType {\n  BrowserIncompatible = \"browser-incompatible\",\n  Disconnected = \"disconnected\",\n  InvalidID = \"invalid-id\",\n  InvalidKey = \"invalid-key\",\n  Network = \"network\",\n  PeerUnavailable = \"peer-unavailable\",\n  SslUnavailable = \"ssl-unavailable\",\n  ServerError = \"server-error\",\n  SocketError = \"socket-error\",\n  SocketClosed = \"socket-closed\",\n  UnavailableID = \"unavailable-id\",\n  WebRTC = \"webrtc\"\n}\n\nexport enum SerializationType {\n  Binary = \"binary\",\n  BinaryUTF8 = \"binary-utf8\",\n  JSON = \"json\"\n}\n\nexport enum SocketEventType {\n  Message = \"message\",\n  Disconnected = \"disconnected\",\n  Error = \"error\",\n  Close = \"close\"\n}\n\nexport enum ServerMessageType {\n  Heartbeat = \"HEARTBEAT\",\n  Candidate = \"CANDIDATE\",\n  Offer = \"OFFER\",\n  Answer = \"ANSWER\",\n  Open = \"OPEN\", // The connection to the server is open.\n  Error = \"ERROR\", // Server error.\n  IdTaken = \"ID-TAKEN\", // The selected ID is taken.\n  InvalidKey = \"INVALID-KEY\", // The given API key cannot be found.\n  Leave = \"LEAVE\", // Another peer has closed its connection to this peer.\n  Expire = \"EXPIRE\" // The offer sent to a peer has expired without response.\n\n}","import { EventEmitter } from \"eventemitter3\";\nimport logger from \"./logger\";\nimport { SocketEventType, ServerMessageType } from \"./enums\";\n\n/**\n * An abstraction on top of WebSockets to provide fastest\n * possible connection for peers.\n */\nexport class Socket extends EventEmitter {\n  private _disconnected: boolean = true;\n  private _id?: string;\n  private _messagesQueue: Array<object> = [];\n  private _socket?: WebSocket;\n  private _wsPingTimer?: any;\n  private readonly _baseUrl: string;\n\n  constructor(\n    secure: any,\n    host: string,\n    port: number,\n    path: string,\n    key: string,\n    private readonly pingInterval: number = 5000,\n  ) {\n    super();\n\n    const wsProtocol = secure ? \"wss://\" : \"ws://\";\n\n    this._baseUrl = wsProtocol + host + \":\" + port + path + \"peerjs?key=\" + key;\n  }\n\n  start(id: string, token: string): void {\n    this._id = id;\n\n    const wsUrl = `${this._baseUrl}&id=${id}&token=${token}`;\n\n    if (!!this._socket || !this._disconnected) {\n      return;\n    }\n\n    this._socket = new WebSocket(wsUrl);\n    this._disconnected = false;\n\n    this._socket.onmessage = (event) => {\n      let data;\n\n      try {\n        data = JSON.parse(event.data);\n        logger.log(\"Server message received:\", data);\n      } catch (e) {\n        logger.log(\"Invalid server message\", event.data);\n        return;\n      }\n\n      this.emit(SocketEventType.Message, data);\n    };\n\n    this._socket.onclose = (event) => {\n      if (this._disconnected) {\n        return;\n      }\n\n      logger.log(\"Socket closed.\", event);\n\n      this._cleanup();\n      this._disconnected = true;\n\n      this.emit(SocketEventType.Disconnected);\n    };\n\n    // Take care of the queue of connections if necessary and make sure Peer knows\n    // socket is open.\n    this._socket.onopen = () => {\n      if (this._disconnected) {\n        return;\n      }\n\n      this._sendQueuedMessages();\n\n      logger.log(\"Socket open\");\n\n      this._scheduleHeartbeat();\n    };\n  }\n\n  private _scheduleHeartbeat(): void {\n    this._wsPingTimer = setTimeout(() => {\n      this._sendHeartbeat();\n    }, this.pingInterval);\n  }\n\n  private _sendHeartbeat(): void {\n    if (!this._wsOpen()) {\n      logger.log(`Cannot send heartbeat, because socket closed`);\n      return;\n    }\n\n    const message = JSON.stringify({ type: ServerMessageType.Heartbeat });\n\n    this._socket!.send(message);\n\n    this._scheduleHeartbeat();\n  }\n\n  /** Is the websocket currently open? */\n  private _wsOpen(): boolean {\n    return !!this._socket && this._socket.readyState === 1;\n  }\n\n  /** Send queued messages. */\n  private _sendQueuedMessages(): void {\n    //Create copy of queue and clear it,\n    //because send method push the message back to queue if smth will go wrong\n    const copiedQueue = [...this._messagesQueue];\n    this._messagesQueue = [];\n\n    for (const message of copiedQueue) {\n      this.send(message);\n    }\n  }\n\n  /** Exposed send for DC & Peer. */\n  send(data: any): void {\n    if (this._disconnected) {\n      return;\n    }\n\n    // If we didn't get an ID yet, we can't yet send anything so we should queue\n    // up these messages.\n    if (!this._id) {\n      this._messagesQueue.push(data);\n      return;\n    }\n\n    if (!data.type) {\n      this.emit(SocketEventType.Error, \"Invalid message\");\n      return;\n    }\n\n    if (!this._wsOpen()) {\n      return;\n    }\n\n    const message = JSON.stringify(data);\n\n    this._socket!.send(message);\n  }\n\n  close(): void {\n    if (this._disconnected) {\n      return;\n    }\n\n    this._cleanup();\n\n    this._disconnected = true;\n  }\n\n  private _cleanup(): void {\n    if (this._socket) {\n      this._socket.onopen = this._socket.onmessage = this._socket.onclose = null;\n      this._socket.close();\n      this._socket = undefined;\n    }\n\n    clearTimeout(this._wsPingTimer!);\n  }\n}\n","import { util } from \"./util\";\nimport logger from \"./logger\";\nimport { MediaConnection } from \"./mediaconnection\";\nimport { DataConnection } from \"./dataconnection\";\nimport { ConnectionType, PeerErrorType, ConnectionEventType, ServerMessageType } from \"./enums\";\nimport { BaseConnection } from \"./baseconnection\";\n\n/**\n * Manages all negotiations between Peers.\n */\nexport class Negotiator {\n  constructor(readonly connection: BaseConnection) { }\n\n  /** Returns a PeerConnection object set up correctly (for data, media). */\n  startConnection(options: any) {\n    const peerConnection = this._startPeerConnection();\n\n    // Set the connection's PC.\n    this.connection.peerConnection = peerConnection;\n\n    if (this.connection.type === ConnectionType.Media && options._stream) {\n      this._addTracksToConnection(options._stream, peerConnection);\n    }\n\n    // What do we need to do now?\n    if (options.originator) {\n      if (this.connection.type === ConnectionType.Data) {\n        const dataConnection = <DataConnection>this.connection;\n\n        const config: RTCDataChannelInit = { ordered: !!options.reliable };\n\n        const dataChannel = peerConnection.createDataChannel(\n          dataConnection.label,\n          config\n        );\n        dataConnection.initialize(dataChannel);\n      }\n\n      this._makeOffer();\n    } else {\n      this.handleSDP(\"OFFER\", options.sdp);\n    }\n  }\n\n  /** Start a PC. */\n  private _startPeerConnection(): RTCPeerConnection {\n    logger.log(\"Creating RTCPeerConnection.\");\n\n    const peerConnection = new RTCPeerConnection(this.connection.provider.options.config);\n\n    this._setupListeners(peerConnection);\n\n    return peerConnection;\n  }\n\n  /** Set up various WebRTC listeners. */\n  private _setupListeners(\n    peerConnection: RTCPeerConnection\n  ) {\n    const peerId = this.connection.peer;\n    const connectionId = this.connection.connectionId;\n    const connectionType = this.connection.type;\n    const provider = this.connection.provider;\n\n    // ICE CANDIDATES.\n    logger.log(\"Listening for ICE candidates.\");\n\n    peerConnection.onicecandidate = (evt) => {\n      if (!evt.candidate || !evt.candidate.candidate) return;\n\n      logger.log(`Received ICE candidates for ${peerId}:`, evt.candidate);\n\n      provider.socket.send({\n        type: ServerMessageType.Candidate,\n        payload: {\n          candidate: evt.candidate,\n          type: connectionType,\n          connectionId: connectionId\n        },\n        dst: peerId\n      });\n    };\n\n    peerConnection.oniceconnectionstatechange = () => {\n      switch (peerConnection.iceConnectionState) {\n        case \"failed\":\n          logger.log(\n            \"iceConnectionState is failed, closing connections to \" +\n            peerId\n          );\n          this.connection.emit(\n            ConnectionEventType.Error,\n            new Error(\"Negotiation of connection to \" + peerId + \" failed.\")\n          );\n          this.connection.close();\n          break;\n        case \"closed\":\n          logger.log(\n            \"iceConnectionState is closed, closing connections to \" +\n            peerId\n          );\n          this.connection.emit(\n            ConnectionEventType.Error,\n            new Error(\"Connection to \" + peerId + \" closed.\")\n          );\n          this.connection.close();\n          break;\n        case \"disconnected\":\n          logger.log(\n            \"iceConnectionState changed to disconnected on the connection with \" +\n            peerId\n          );\n          break;\n        case \"completed\":\n          peerConnection.onicecandidate = util.noop;\n          break;\n      }\n\n      this.connection.emit(ConnectionEventType.IceStateChanged, peerConnection.iceConnectionState);\n    };\n\n    // DATACONNECTION.\n    logger.log(\"Listening for data channel\");\n    // Fired between offer and answer, so options should already be saved\n    // in the options hash.\n    peerConnection.ondatachannel = (evt) => {\n      logger.log(\"Received data channel\");\n\n      const dataChannel = evt.channel;\n      const connection = <DataConnection>(\n        provider.getConnection(peerId, connectionId)\n      );\n\n      connection.initialize(dataChannel);\n    };\n\n    // MEDIACONNECTION.\n    logger.log(\"Listening for remote stream\");\n\n    peerConnection.ontrack = (evt) => {\n      logger.log(\"Received remote stream\");\n\n      const stream = evt.streams[0];\n      const connection = provider.getConnection(peerId, connectionId);\n\n      if (connection.type === ConnectionType.Media) {\n        const mediaConnection = <MediaConnection>connection;\n\n        this._addStreamToMediaConnection(stream, mediaConnection);\n      }\n    };\n  }\n\n  cleanup(): void {\n    logger.log(\"Cleaning up PeerConnection to \" + this.connection.peer);\n\n    const peerConnection = this.connection.peerConnection;\n\n    if (!peerConnection) {\n      return;\n    }\n\n    this.connection.peerConnection = null;\n\n    //unsubscribe from all PeerConnection's events\n    peerConnection.onicecandidate = peerConnection.oniceconnectionstatechange = peerConnection.ondatachannel = peerConnection.ontrack = () => { };\n\n    const peerConnectionNotClosed = peerConnection.signalingState !== \"closed\";\n    let dataChannelNotClosed = false;\n\n    if (this.connection.type === ConnectionType.Data) {\n      const dataConnection = <DataConnection>this.connection;\n      const dataChannel = dataConnection.dataChannel;\n\n      if (dataChannel) {\n        dataChannelNotClosed = !!dataChannel.readyState && dataChannel.readyState !== \"closed\";\n      }\n    }\n\n    if (peerConnectionNotClosed || dataChannelNotClosed) {\n      peerConnection.close();\n    }\n  }\n\n  private async _makeOffer(): Promise<void> {\n    const peerConnection = this.connection.peerConnection;\n    const provider = this.connection.provider;\n\n    try {\n      const offer = await peerConnection.createOffer(\n        this.connection.options.constraints\n      );\n\n      logger.log(\"Created offer.\");\n\n      if (this.connection.options.sdpTransform && typeof this.connection.options.sdpTransform === 'function') {\n        offer.sdp = this.connection.options.sdpTransform(offer.sdp) || offer.sdp;\n      }\n\n      try {\n        await peerConnection.setLocalDescription(offer);\n\n        logger.log(\"Set localDescription:\", offer, `for:${this.connection.peer}`);\n\n        let payload: any = {\n          sdp: offer,\n          type: this.connection.type,\n          connectionId: this.connection.connectionId,\n          metadata: this.connection.metadata,\n          browser: util.browser\n        };\n\n        if (this.connection.type === ConnectionType.Data) {\n          const dataConnection = <DataConnection>this.connection;\n\n          payload = {\n            ...payload,\n            label: dataConnection.label,\n            reliable: dataConnection.reliable,\n            serialization: dataConnection.serialization\n          };\n        }\n\n        provider.socket.send({\n          type: ServerMessageType.Offer,\n          payload,\n          dst: this.connection.peer\n        });\n      } catch (err) {\n        // TODO: investigate why _makeOffer is being called from the answer\n        if (\n          err !=\n          \"OperationError: Failed to set local offer sdp: Called in wrong state: kHaveRemoteOffer\"\n        ) {\n          provider.emitError(PeerErrorType.WebRTC, err);\n          logger.log(\"Failed to setLocalDescription, \", err);\n        }\n      }\n    } catch (err_1) {\n      provider.emitError(PeerErrorType.WebRTC, err_1);\n      logger.log(\"Failed to createOffer, \", err_1);\n    }\n  }\n\n  private async _makeAnswer(): Promise<void> {\n    const peerConnection = this.connection.peerConnection;\n    const provider = this.connection.provider;\n\n    try {\n      const answer = await peerConnection.createAnswer();\n      logger.log(\"Created answer.\");\n\n      if (this.connection.options.sdpTransform && typeof this.connection.options.sdpTransform === 'function') {\n        answer.sdp = this.connection.options.sdpTransform(answer.sdp) || answer.sdp;\n      }\n\n      try {\n        await peerConnection.setLocalDescription(answer);\n\n        logger.log(`Set localDescription:`, answer, `for:${this.connection.peer}`);\n\n        provider.socket.send({\n          type: ServerMessageType.Answer,\n          payload: {\n            sdp: answer,\n            type: this.connection.type,\n            connectionId: this.connection.connectionId,\n            browser: util.browser\n          },\n          dst: this.connection.peer\n        });\n      } catch (err) {\n        provider.emitError(PeerErrorType.WebRTC, err);\n        logger.log(\"Failed to setLocalDescription, \", err);\n      }\n    } catch (err_1) {\n      provider.emitError(PeerErrorType.WebRTC, err_1);\n      logger.log(\"Failed to create answer, \", err_1);\n    }\n  }\n\n  /** Handle an SDP. */\n  async handleSDP(\n    type: string,\n    sdp: any\n  ): Promise<void> {\n    sdp = new RTCSessionDescription(sdp);\n    const peerConnection = this.connection.peerConnection;\n    const provider = this.connection.provider;\n\n    logger.log(\"Setting remote description\", sdp);\n\n    const self = this;\n\n    try {\n      await peerConnection.setRemoteDescription(sdp);\n      logger.log(`Set remoteDescription:${type} for:${this.connection.peer}`);\n      if (type === \"OFFER\") {\n        await self._makeAnswer();\n      }\n    } catch (err) {\n      provider.emitError(PeerErrorType.WebRTC, err);\n      logger.log(\"Failed to setRemoteDescription, \", err);\n    }\n  }\n\n  /** Handle a candidate. */\n  async handleCandidate(ice: any): Promise<void> {\n    logger.log(`handleCandidate:`, ice);\n\n    const candidate = ice.candidate;\n    const sdpMLineIndex = ice.sdpMLineIndex;\n    const sdpMid = ice.sdpMid;\n    const peerConnection = this.connection.peerConnection;\n    const provider = this.connection.provider;\n\n    try {\n      await peerConnection.addIceCandidate(\n        new RTCIceCandidate({\n          sdpMid: sdpMid,\n          sdpMLineIndex: sdpMLineIndex,\n          candidate: candidate\n        })\n      );\n      logger.log(`Added ICE candidate for:${this.connection.peer}`);\n    } catch (err) {\n      provider.emitError(PeerErrorType.WebRTC, err);\n      logger.log(\"Failed to handleCandidate, \", err);\n    }\n  }\n\n  private _addTracksToConnection(\n    stream: MediaStream,\n    peerConnection: RTCPeerConnection\n  ): void {\n    logger.log(`add tracks from stream ${stream.id} to peer connection`);\n\n    if (!peerConnection.addTrack) {\n      return logger.error(\n        `Your browser does't support RTCPeerConnection#addTrack. Ignored.`\n      );\n    }\n\n    stream.getTracks().forEach(track => {\n      peerConnection.addTrack(track, stream);\n    });\n  }\n\n  private _addStreamToMediaConnection(\n    stream: MediaStream,\n    mediaConnection: MediaConnection\n  ): void {\n    logger.log(\n      `add stream ${stream.id} to media connection ${\n      mediaConnection.connectionId\n      }`\n    );\n\n    mediaConnection.addStream(stream);\n  }\n}\n","import { EventEmitter } from \"eventemitter3\";\nimport { Peer } from \"./peer\";\nimport { ServerMessage } from \"./servermessage\";\nimport { ConnectionType } from \"./enums\";\n\nexport abstract class BaseConnection extends EventEmitter {\n  protected _open = false;\n\n  readonly metadata: any;\n  connectionId: string;\n\n  peerConnection: RTCPeerConnection;\n\n  abstract get type(): ConnectionType;\n\n  get open() {\n    return this._open;\n  }\n\n  constructor(\n    readonly peer: string,\n    public provider: Peer,\n    readonly options: any\n  ) {\n    super();\n\n    this.metadata = options.metadata;\n  }\n\n  abstract close(): void;\n\n  abstract handleMessage(message: ServerMessage): void;\n}\n","import { util } from \"./util\";\nimport logger from \"./logger\";\nimport { Negotiator } from \"./negotiator\";\nimport { ConnectionType, ConnectionEventType, ServerMessageType } from \"./enums\";\nimport { Peer } from \"./peer\";\nimport { BaseConnection } from \"./baseconnection\";\nimport { ServerMessage } from \"./servermessage\";\nimport { AnswerOption } from \"..\";\n\n/**\n * Wraps the streaming interface between two Peers.\n */\nexport class MediaConnection extends BaseConnection {\n  private static readonly ID_PREFIX = \"mc_\";\n\n  private _negotiator: Negotiator;\n  private _localStream: MediaStream;\n  private _remoteStream: MediaStream;\n\n  get type() {\n    return ConnectionType.Media;\n  }\n\n  get localStream(): MediaStream { return this._localStream; }\n  get remoteStream(): MediaStream { return this._remoteStream; }\n\n  constructor(peerId: string, provider: Peer, options: any) {\n    super(peerId, provider, options);\n\n    this._localStream = this.options._stream;\n    this.connectionId =\n      this.options.connectionId ||\n      MediaConnection.ID_PREFIX + util.randomToken();\n\n    this._negotiator = new Negotiator(this);\n\n    if (this._localStream) {\n      this._negotiator.startConnection({\n        _stream: this._localStream,\n        originator: true\n      });\n    }\n  }\n\n  addStream(remoteStream) {\n    logger.log(\"Receiving stream\", remoteStream);\n\n    this._remoteStream = remoteStream;\n    super.emit(ConnectionEventType.Stream, remoteStream); // Should we call this `open`?\n  }\n\n  handleMessage(message: ServerMessage): void {\n    const type = message.type;\n    const payload = message.payload;\n\n    switch (message.type) {\n      case ServerMessageType.Answer:\n        // Forward to negotiator\n        this._negotiator.handleSDP(type, payload.sdp);\n        this._open = true;\n        break;\n      case ServerMessageType.Candidate:\n        this._negotiator.handleCandidate(payload.candidate);\n        break;\n      default:\n        logger.warn(`Unrecognized message type:${type} from peer:${this.peer}`);\n        break;\n    }\n  }\n\n  answer(stream: MediaStream, options: AnswerOption = {}): void {\n    if (this._localStream) {\n      logger.warn(\n        \"Local stream already exists on this MediaConnection. Are you answering a call twice?\"\n      );\n      return;\n    }\n\n    this._localStream = stream;\n\n    if (options && options.sdpTransform) {\n      this.options.sdpTransform = options.sdpTransform;\n    }\n\n    this._negotiator.startConnection({ ...this.options._payload, _stream: stream });\n    // Retrieve lost messages stored because PeerConnection not set up.\n    const messages = this.provider._getMessages(this.connectionId);\n\n    for (let message of messages) {\n      this.handleMessage(message);\n    }\n\n    this._open = true;\n  }\n\n  /**\n   * Exposed functionality for users.\n   */\n\n  /** Allows user to close connection. */\n  close(): void {\n    if (this._negotiator) {\n      this._negotiator.cleanup();\n      this._negotiator = null;\n    }\n\n    this._localStream = null;\n    this._remoteStream = null;\n\n    if (this.provider) {\n      this.provider._removeConnection(this);\n\n      this.provider = null;\n    }\n\n    if (this.options && this.options._stream) {\n      this.options._stream = null;\n    }\n\n    if (!this.open) {\n      return;\n    }\n\n    this._open = false;\n\n    super.emit(ConnectionEventType.Close);\n  }\n}\n","import { EventEmitter } from \"eventemitter3\";\nimport logger from \"./logger\";\n\nexport class EncodingQueue extends EventEmitter {\n  readonly fileReader: FileReader = new FileReader();\n\n  private _queue: Blob[] = [];\n  private _processing: boolean = false;\n\n  constructor() {\n    super();\n\n    this.fileReader.onload = (evt) => {\n      this._processing = false;\n\n      if (evt.target) {\n        this.emit('done', evt.target.result as ArrayBuffer);\n      }\n\n      this.doNextTask();\n    };\n\n    this.fileReader.onerror = (evt) => {\n      logger.error(`EncodingQueue error:`, evt);\n      this._processing = false;\n      this.destroy();\n      this.emit('error', evt);\n    }\n  }\n\n  get queue(): Blob[] {\n    return this._queue;\n  }\n\n  get size(): number {\n    return this.queue.length;\n  }\n\n  get processing(): boolean {\n    return this._processing;\n  }\n\n  enque(blob: Blob): void {\n    this.queue.push(blob);\n\n    if (this.processing) return;\n\n    this.doNextTask();\n  }\n\n  destroy(): void {\n    this.fileReader.abort();\n    this._queue = [];\n  }\n\n  private doNextTask(): void {\n    if (this.size === 0) return;\n    if (this.processing) return;\n\n    this._processing = true;\n\n    this.fileReader.readAsArrayBuffer(this.queue.shift());\n  }\n}","import { util } from \"./util\";\nimport logger from \"./logger\";\nimport { Negotiator } from \"./negotiator\";\nimport {\n  ConnectionType,\n  ConnectionEventType,\n  SerializationType,\n  ServerMessageType\n} from \"./enums\";\nimport { Peer } from \"./peer\";\nimport { BaseConnection } from \"./baseconnection\";\nimport { ServerMessage } from \"./servermessage\";\nimport { EncodingQueue } from './encodingQueue';\nimport { DataConnection as IDataConnection } from '../index';\n\n/**\n * Wraps a DataChannel between two Peers.\n */\nexport class DataConnection extends BaseConnection implements IDataConnection {\n  private static readonly ID_PREFIX = \"dc_\";\n  private static readonly MAX_BUFFERED_AMOUNT = 8 * 1024 * 1024;\n\n  private _negotiator: Negotiator;\n  readonly label: string;\n  readonly serialization: SerializationType;\n  readonly reliable: boolean;\n  stringify: (data: any) => string = JSON.stringify;\n  parse: (data: string) => any = JSON.parse;\n\n  get type() {\n    return ConnectionType.Data;\n  }\n\n  private _buffer: any[] = [];\n  private _bufferSize = 0;\n  private _buffering = false;\n  private _chunkedData: {\n    [id: number]: {\n      data: Blob[],\n      count: number,\n      total: number\n    }\n  } = {};\n\n  private _dc: RTCDataChannel;\n  private _encodingQueue = new EncodingQueue();\n\n  get dataChannel(): RTCDataChannel {\n    return this._dc;\n  }\n\n  get bufferSize(): number { return this._bufferSize; }\n\n  constructor(peerId: string, provider: Peer, options: any) {\n    super(peerId, provider, options);\n\n    this.connectionId =\n      this.options.connectionId || DataConnection.ID_PREFIX + util.randomToken();\n\n    this.label = this.options.label || this.connectionId;\n    this.serialization = this.options.serialization || SerializationType.Binary;\n    this.reliable = !!this.options.reliable;\n\n    this._encodingQueue.on('done', (ab: ArrayBuffer) => {\n      this._bufferedSend(ab);\n    });\n\n    this._encodingQueue.on('error', () => {\n      logger.error(`DC#${this.connectionId}: Error occured in encoding from blob to arraybuffer, close DC`);\n      this.close();\n    });\n\n    this._negotiator = new Negotiator(this);\n\n    this._negotiator.startConnection(\n      this.options._payload || {\n        originator: true\n      }\n    );\n  }\n\n  /** Called by the Negotiator when the DataChannel is ready. */\n  initialize(dc: RTCDataChannel): void {\n    this._dc = dc;\n    this._configureDataChannel();\n  }\n\n  private _configureDataChannel(): void {\n    if (!util.supports.binaryBlob || util.supports.reliable) {\n      this.dataChannel.binaryType = \"arraybuffer\";\n    }\n\n    this.dataChannel.onopen = () => {\n      logger.log(`DC#${this.connectionId} dc connection success`);\n      this._open = true;\n      this.emit(ConnectionEventType.Open);\n    };\n\n    this.dataChannel.onmessage = (e) => {\n      logger.log(`DC#${this.connectionId} dc onmessage:`, e.data);\n      this._handleDataMessage(e);\n    };\n\n    this.dataChannel.onclose = () => {\n      logger.log(`DC#${this.connectionId} dc closed for:`, this.peer);\n      this.close();\n    };\n  }\n\n  // Handles a DataChannel message.\n  private _handleDataMessage({ data }: { data: Blob | ArrayBuffer | string }): void {\n    const datatype = data.constructor;\n\n    const isBinarySerialization = this.serialization === SerializationType.Binary ||\n      this.serialization === SerializationType.BinaryUTF8;\n\n    let deserializedData: any = data;\n\n    if (isBinarySerialization) {\n      if (datatype === Blob) {\n        // Datatype should never be blob\n        util.blobToArrayBuffer(data as Blob, (ab) => {\n          const unpackedData = util.unpack(ab);\n          this.emit(ConnectionEventType.Data, unpackedData);\n        });\n        return;\n      } else if (datatype === ArrayBuffer) {\n        deserializedData = util.unpack(data as ArrayBuffer);\n      } else if (datatype === String) {\n        // String fallback for binary data for browsers that don't support binary yet\n        const ab = util.binaryStringToArrayBuffer(data as string);\n        deserializedData = util.unpack(ab);\n      }\n    } else if (this.serialization === SerializationType.JSON) {\n      deserializedData = this.parse(data as string);\n    }\n\n    // Check if we've chunked--if so, piece things back together.\n    // We're guaranteed that this isn't 0.\n    if (deserializedData.__peerData) {\n      this._handleChunk(deserializedData);\n      return;\n    }\n\n    super.emit(ConnectionEventType.Data, deserializedData);\n  }\n\n  private _handleChunk(data: { __peerData: number, n: number, total: number, data: Blob }): void {\n    const id = data.__peerData;\n    const chunkInfo = this._chunkedData[id] || {\n      data: [],\n      count: 0,\n      total: data.total\n    };\n\n    chunkInfo.data[data.n] = data.data;\n    chunkInfo.count++;\n    this._chunkedData[id] = chunkInfo;\n\n    if (chunkInfo.total === chunkInfo.count) {\n      // Clean up before making the recursive call to `_handleDataMessage`.\n      delete this._chunkedData[id];\n\n      // We've received all the chunks--time to construct the complete data.\n      const data = new Blob(chunkInfo.data);\n      this._handleDataMessage({ data });\n    }\n  }\n\n  /**\n   * Exposed functionality for users.\n   */\n\n  /** Allows user to close connection. */\n  close(): void {\n    this._buffer = [];\n    this._bufferSize = 0;\n    this._chunkedData = {};\n\n    if (this._negotiator) {\n      this._negotiator.cleanup();\n      this._negotiator = null;\n    }\n\n    if (this.provider) {\n      this.provider._removeConnection(this);\n\n      this.provider = null;\n    }\n\n    if (this.dataChannel) {\n      this.dataChannel.onopen = null;\n      this.dataChannel.onmessage = null;\n      this.dataChannel.onclose = null;\n      this._dc = null;\n    }\n\n    if (this._encodingQueue) {\n      this._encodingQueue.destroy();\n      this._encodingQueue.removeAllListeners();\n      this._encodingQueue = null;\n    }\n\n    if (!this.open) {\n      return;\n    }\n\n    this._open = false;\n\n    super.emit(ConnectionEventType.Close);\n  }\n\n  /** Allows user to send data. */\n  send(data: any, chunked?: boolean): void {\n    if (!this.open) {\n      super.emit(\n        ConnectionEventType.Error,\n        new Error(\n          \"Connection is not open. You should listen for the `open` event before sending messages.\"\n        )\n      );\n      return;\n    }\n\n    if (this.serialization === SerializationType.JSON) {\n      this._bufferedSend(this.stringify(data));\n    } else if (\n      this.serialization === SerializationType.Binary ||\n      this.serialization === SerializationType.BinaryUTF8\n    ) {\n      const blob = util.pack(data);\n\n      if (!chunked && blob.size > util.chunkedMTU) {\n        this._sendChunks(blob);\n        return;\n      }\n\n      if (!util.supports.binaryBlob) {\n        // We only do this if we really need to (e.g. blobs are not supported),\n        // because this conversion is costly.\n        this._encodingQueue.enque(blob);\n      } else {\n        this._bufferedSend(blob);\n      }\n    } else {\n      this._bufferedSend(data);\n    }\n  }\n\n  private _bufferedSend(msg: any): void {\n    if (this._buffering || !this._trySend(msg)) {\n      this._buffer.push(msg);\n      this._bufferSize = this._buffer.length;\n    }\n  }\n\n  // Returns true if the send succeeds.\n  private _trySend(msg: any): boolean {\n    if (!this.open) {\n      return false;\n    }\n\n    if (this.dataChannel.bufferedAmount > DataConnection.MAX_BUFFERED_AMOUNT) {\n      this._buffering = true;\n      setTimeout(() => {\n        this._buffering = false;\n        this._tryBuffer();\n      }, 50);\n\n      return false;\n    }\n\n    try {\n      this.dataChannel.send(msg);\n    } catch (e) {\n      logger.error(`DC#:${this.connectionId} Error when sending:`, e);\n      this._buffering = true;\n\n      this.close();\n\n      return false;\n    }\n\n    return true;\n  }\n\n  // Try to send the first message in the buffer.\n  private _tryBuffer(): void {\n    if (!this.open) {\n      return;\n    }\n\n    if (this._buffer.length === 0) {\n      return;\n    }\n\n    const msg = this._buffer[0];\n\n    if (this._trySend(msg)) {\n      this._buffer.shift();\n      this._bufferSize = this._buffer.length;\n      this._tryBuffer();\n    }\n  }\n\n  private _sendChunks(blob: Blob): void {\n    const blobs = util.chunk(blob);\n    logger.log(`DC#${this.connectionId} Try to send ${blobs.length} chunks...`);\n\n    for (let blob of blobs) {\n      this.send(blob, true);\n    }\n  }\n\n  handleMessage(message: ServerMessage): void {\n    const payload = message.payload;\n\n    switch (message.type) {\n      case ServerMessageType.Answer:\n        this._negotiator.handleSDP(message.type, payload.sdp);\n        break;\n      case ServerMessageType.Candidate:\n        this._negotiator.handleCandidate(payload.candidate);\n        break;\n      default:\n        logger.warn(\n          \"Unrecognized message type:\",\n          message.type,\n          \"from peer:\",\n          this.peer\n        );\n        break;\n    }\n  }\n}\n","import { util } from \"./util\";\nimport logger from \"./logger\";\n\nexport class API {\n  constructor(private readonly _options: any) { }\n\n  private _buildUrl(method: string): string {\n    const protocol = this._options.secure ? \"https://\" : \"http://\";\n    let url =\n      protocol +\n      this._options.host +\n      \":\" +\n      this._options.port +\n      this._options.path +\n      this._options.key +\n      \"/\" +\n      method;\n    const queryString = \"?ts=\" + new Date().getTime() + \"\" + Math.random();\n    url += queryString;\n\n    return url;\n  }\n\n  /** Get a unique ID from the server via XHR and initialize with it. */\n  async retrieveId(): Promise<string> {\n    const url = this._buildUrl(\"id\");\n\n    try {\n      const response = await fetch(url);\n\n      if (response.status !== 200) {\n        throw new Error(`Error. Status:${response.status}`);\n      }\n\n      return response.text();\n    } catch (error) {\n      logger.error(\"Error retrieving ID\", error);\n\n      let pathError = \"\";\n\n      if (\n        this._options.path === \"/\" &&\n        this._options.host !== util.CLOUD_HOST\n      ) {\n        pathError =\n          \" If you passed in a `path` to your self-hosted PeerServer, \" +\n          \"you'll also need to pass in that same path when creating a new \" +\n          \"Peer.\";\n      }\n\n      throw new Error(\"Could not get an ID from the server.\" + pathError);\n    }\n  }\n\n  /** @deprecated */\n  async listAllPeers(): Promise<any[]> {\n    const url = this._buildUrl(\"peers\");\n\n    try {\n      const response = await fetch(url);\n\n      if (response.status !== 200) {\n        if (response.status === 401) {\n          let helpfulError = \"\";\n\n          if (this._options.host === util.CLOUD_HOST) {\n            helpfulError =\n              \"It looks like you're using the cloud server. You can email \" +\n              \"team@peerjs.com to enable peer listing for your API key.\";\n          } else {\n            helpfulError =\n              \"You need to enable `allow_discovery` on your self-hosted \" +\n              \"PeerServer to use this feature.\";\n          }\n\n          throw new Error(\"It doesn't look like you have permission to list peers IDs. \" +\n            helpfulError);\n        }\n\n        throw new Error(`Error. Status:${response.status}`);\n      }\n\n      return response.json();\n    } catch (error) {\n      logger.error(\"Error retrieving list peers\", error);\n\n      throw new Error(\"Could not get list peers from the server.\" + error);\n    }\n  }\n}\n","import { EventEmitter } from \"eventemitter3\";\nimport { util } from \"./util\";\nimport logger, { LogLevel } from \"./logger\";\nimport { Socket } from \"./socket\";\nimport { MediaConnection } from \"./mediaconnection\";\nimport { DataConnection } from \"./dataconnection\";\nimport {\n  ConnectionType,\n  PeerErrorType,\n  PeerEventType,\n  SocketEventType,\n  ServerMessageType\n} from \"./enums\";\nimport { BaseConnection } from \"./baseconnection\";\nimport { ServerMessage } from \"./servermessage\";\nimport { API } from \"./api\";\nimport { PeerConnectOption, PeerJSOption } from \"..\";\n\nclass PeerOptions implements PeerJSOption {\n  debug?: LogLevel; // 1: Errors, 2: Warnings, 3: All logs\n  host?: string;\n  port?: number;\n  path?: string;\n  key?: string;\n  token?: string;\n  config?: any;\n  secure?: boolean;\n  pingInterval?: number;\n  logFunction?: (logLevel: LogLevel, ...rest: any[]) => void;\n}\n\n/**\n * A peer who can initiate connections with other peers.\n */\nexport class Peer extends EventEmitter {\n  private static readonly DEFAULT_KEY = \"peerjs\";\n\n  private readonly _options: PeerOptions;\n  private readonly _api: API;\n  private readonly _socket: Socket;\n\n  private _id: string | null = null;\n  private _lastServerId: string | null = null;\n\n  // States.\n  private _destroyed = false; // Connections have been killed\n  private _disconnected = false; // Connection to PeerServer killed but P2P connections still active\n  private _open = false; // Sockets and such are not yet open.\n  private readonly _connections: Map<string, BaseConnection[]> = new Map(); // All connections for this peer.\n  private readonly _lostMessages: Map<string, ServerMessage[]> = new Map(); // src => [list of messages]\n\n  get id() {\n    return this._id;\n  }\n\n  get options() {\n    return this._options;\n  }\n\n  get open() {\n    return this._open;\n  }\n\n  get socket() {\n    return this._socket;\n  }\n\n  /**\n   * @deprecated \n   * Return type will change from Object to Map<string,[]> \n   */\n  get connections(): Object {\n    const plainConnections = Object.create(null);\n\n    for (let [k, v] of this._connections) {\n      plainConnections[k] = v;\n    }\n\n    return plainConnections;\n  }\n\n  get destroyed() {\n    return this._destroyed;\n  }\n  get disconnected() {\n    return this._disconnected;\n  }\n\n  constructor(id?: string | PeerOptions, options?: PeerOptions) {\n    super();\n\n    let userId: string | undefined;\n\n    // Deal with overloading\n    if (id && id.constructor == Object) {\n      options = id as PeerOptions;\n    } else if (id) {\n      userId = id.toString();\n    }\n\n    // Configurize options\n    options = {\n      debug: 0, // 1: Errors, 2: Warnings, 3: All logs\n      host: util.CLOUD_HOST,\n      port: util.CLOUD_PORT,\n      path: \"/\",\n      key: Peer.DEFAULT_KEY,\n      token: util.randomToken(),\n      config: util.defaultConfig,\n      ...options\n    };\n    this._options = options;\n\n    // Detect relative URL host.\n    if (this._options.host === \"/\") {\n      this._options.host = window.location.hostname;\n    }\n\n    // Set path correctly.\n    if (this._options.path) {\n      if (this._options.path[0] !== \"/\") {\n        this._options.path = \"/\" + this._options.path;\n      }\n      if (this._options.path[this._options.path.length - 1] !== \"/\") {\n        this._options.path += \"/\";\n      }\n    }\n\n    // Set whether we use SSL to same as current host\n    if (this._options.secure === undefined && this._options.host !== util.CLOUD_HOST) {\n      this._options.secure = util.isSecure();\n    } else if (this._options.host == util.CLOUD_HOST) {\n      this._options.secure = true;\n    }\n    // Set a custom log function if present\n    if (this._options.logFunction) {\n      logger.setLogFunction(this._options.logFunction);\n    }\n\n    logger.logLevel = this._options.debug || 0;\n\n    this._api = new API(options);\n    this._socket = this._createServerConnection();\n\n    // Sanity checks\n    // Ensure WebRTC supported\n    if (!util.supports.audioVideo && !util.supports.data) {\n      this._delayedAbort(\n        PeerErrorType.BrowserIncompatible,\n        \"The current browser does not support WebRTC\"\n      );\n      return;\n    }\n\n    // Ensure alphanumeric id\n    if (!!userId && !util.validateId(userId)) {\n      this._delayedAbort(PeerErrorType.InvalidID, `ID \"${userId}\" is invalid`);\n      return;\n    }\n\n    if (userId) {\n      this._initialize(userId);\n    } else {\n      this._api.retrieveId()\n        .then(id => this._initialize(id))\n        .catch(error => this._abort(PeerErrorType.ServerError, error));\n    }\n  }\n\n  private _createServerConnection(): Socket {\n    const socket = new Socket(\n      this._options.secure,\n      this._options.host!,\n      this._options.port!,\n      this._options.path!,\n      this._options.key!,\n      this._options.pingInterval\n    );\n\n    socket.on(SocketEventType.Message, (data: ServerMessage) => {\n      this._handleMessage(data);\n    });\n\n    socket.on(SocketEventType.Error, (error: string) => {\n      this._abort(PeerErrorType.SocketError, error);\n    });\n\n    socket.on(SocketEventType.Disconnected, () => {\n      if (this.disconnected) {\n        return;\n      }\n\n      this.emitError(PeerErrorType.Network, \"Lost connection to server.\");\n      this.disconnect();\n    });\n\n    socket.on(SocketEventType.Close, () => {\n      if (this.disconnected) {\n        return;\n      }\n\n      this._abort(PeerErrorType.SocketClosed, \"Underlying socket is already closed.\");\n    });\n\n    return socket;\n  }\n\n  /** Initialize a connection with the server. */\n  private _initialize(id: string): void {\n    this._id = id;\n    this.socket.start(id, this._options.token!);\n  }\n\n  /** Handles messages from the server. */\n  private _handleMessage(message: ServerMessage): void {\n    const type = message.type;\n    const payload = message.payload;\n    const peerId = message.src;\n\n    switch (type) {\n      case ServerMessageType.Open: // The connection to the server is open.\n        this._lastServerId = this.id;\n        this._open = true;\n        this.emit(PeerEventType.Open, this.id);\n        break;\n      case ServerMessageType.Error: // Server error.\n        this._abort(PeerErrorType.ServerError, payload.msg);\n        break;\n      case ServerMessageType.IdTaken: // The selected ID is taken.\n        this._abort(PeerErrorType.UnavailableID, `ID \"${this.id}\" is taken`);\n        break;\n      case ServerMessageType.InvalidKey: // The given API key cannot be found.\n        this._abort(PeerErrorType.InvalidKey, `API KEY \"${this._options.key}\" is invalid`);\n        break;\n      case ServerMessageType.Leave: // Another peer has closed its connection to this peer.\n        logger.log(`Received leave message from ${peerId}`);\n        this._cleanupPeer(peerId);\n        this._connections.delete(peerId);\n        break;\n      case ServerMessageType.Expire: // The offer sent to a peer has expired without response.\n        this.emitError(PeerErrorType.PeerUnavailable, `Could not connect to peer ${peerId}`);\n        break;\n      case ServerMessageType.Offer: {\n        // we should consider switching this to CALL/CONNECT, but this is the least breaking option.\n        const connectionId = payload.connectionId;\n        let connection = this.getConnection(peerId, connectionId);\n\n        if (connection) {\n          connection.close();\n          logger.warn(`Offer received for existing Connection ID:${connectionId}`);\n        }\n\n        // Create a new connection.\n        if (payload.type === ConnectionType.Media) {\n          connection = new MediaConnection(peerId, this, {\n            connectionId: connectionId,\n            _payload: payload,\n            metadata: payload.metadata\n          });\n          this._addConnection(peerId, connection);\n          this.emit(PeerEventType.Call, connection);\n        } else if (payload.type === ConnectionType.Data) {\n          connection = new DataConnection(peerId, this, {\n            connectionId: connectionId,\n            _payload: payload,\n            metadata: payload.metadata,\n            label: payload.label,\n            serialization: payload.serialization,\n            reliable: payload.reliable\n          });\n          this._addConnection(peerId, connection);\n          this.emit(PeerEventType.Connection, connection);\n        } else {\n          logger.warn(`Received malformed connection type:${payload.type}`);\n          return;\n        }\n\n        // Find messages.\n        const messages = this._getMessages(connectionId);\n        for (let message of messages) {\n          connection.handleMessage(message);\n        }\n\n        break;\n      }\n      default: {\n        if (!payload) {\n          logger.warn(`You received a malformed message from ${peerId} of type ${type}`);\n          return;\n        }\n\n        const connectionId = payload.connectionId;\n        const connection = this.getConnection(peerId, connectionId);\n\n        if (connection && connection.peerConnection) {\n          // Pass it on.\n          connection.handleMessage(message);\n        } else if (connectionId) {\n          // Store for possible later use\n          this._storeMessage(connectionId, message);\n        } else {\n          logger.warn(\"You received an unrecognized message:\", message);\n        }\n        break;\n      }\n    }\n  }\n\n  /** Stores messages without a set up connection, to be claimed later. */\n  private _storeMessage(connectionId: string, message: ServerMessage): void {\n    if (!this._lostMessages.has(connectionId)) {\n      this._lostMessages.set(connectionId, []);\n    }\n\n    this._lostMessages.get(connectionId).push(message);\n  }\n\n  /** Retrieve messages from lost message store */\n  //TODO Change it to private\n  public _getMessages(connectionId: string): ServerMessage[] {\n    const messages = this._lostMessages.get(connectionId);\n\n    if (messages) {\n      this._lostMessages.delete(connectionId);\n      return messages;\n    }\n\n    return [];\n  }\n\n  /**\n   * Returns a DataConnection to the specified peer. See documentation for a\n   * complete list of options.\n   */\n  connect(peer: string, options: PeerConnectOption = {}): DataConnection {\n    if (this.disconnected) {\n      logger.warn(\n        \"You cannot connect to a new Peer because you called \" +\n        \".disconnect() on this Peer and ended your connection with the \" +\n        \"server. You can create a new Peer to reconnect, or call reconnect \" +\n        \"on this peer if you believe its ID to still be available.\"\n      );\n      this.emitError(\n        PeerErrorType.Disconnected,\n        \"Cannot connect to new Peer after disconnecting from server.\"\n      );\n      return;\n    }\n\n    const dataConnection = new DataConnection(peer, this, options);\n    this._addConnection(peer, dataConnection);\n    return dataConnection;\n  }\n\n  /**\n   * Returns a MediaConnection to the specified peer. See documentation for a\n   * complete list of options.\n   */\n  call(peer: string, stream: MediaStream, options: any = {}): MediaConnection {\n    if (this.disconnected) {\n      logger.warn(\n        \"You cannot connect to a new Peer because you called \" +\n        \".disconnect() on this Peer and ended your connection with the \" +\n        \"server. You can create a new Peer to reconnect.\"\n      );\n      this.emitError(\n        PeerErrorType.Disconnected,\n        \"Cannot connect to new Peer after disconnecting from server.\"\n      );\n      return;\n    }\n\n    if (!stream) {\n      logger.error(\n        \"To call a peer, you must provide a stream from your browser's `getUserMedia`.\"\n      );\n      return;\n    }\n\n    options._stream = stream;\n\n    const mediaConnection = new MediaConnection(peer, this, options);\n    this._addConnection(peer, mediaConnection);\n    return mediaConnection;\n  }\n\n  /** Add a data/media connection to this peer. */\n  private _addConnection(peerId: string, connection: BaseConnection): void {\n    logger.log(`add connection ${connection.type}:${connection.connectionId} to peerId:${peerId}`);\n\n    if (!this._connections.has(peerId)) {\n      this._connections.set(peerId, []);\n    }\n    this._connections.get(peerId).push(connection);\n  }\n\n  //TODO should be private\n  _removeConnection(connection: BaseConnection): void {\n    const connections = this._connections.get(connection.peer);\n\n    if (connections) {\n      const index = connections.indexOf(connection);\n\n      if (index !== -1) {\n        connections.splice(index, 1);\n      }\n    }\n\n    //remove from lost messages\n    this._lostMessages.delete(connection.connectionId);\n  }\n\n  /** Retrieve a data/media connection for this peer. */\n  getConnection(peerId: string, connectionId: string): null | BaseConnection {\n    const connections = this._connections.get(peerId);\n    if (!connections) {\n      return null;\n    }\n\n    for (let connection of connections) {\n      if (connection.connectionId === connectionId) {\n        return connection;\n      }\n    }\n\n    return null;\n  }\n\n  private _delayedAbort(type: PeerErrorType, message: string | Error): void {\n    setTimeout(() => {\n      this._abort(type, message);\n    }, 0);\n  }\n\n  /**\n   * Emits an error message and destroys the Peer.\n   * The Peer is not destroyed if it's in a disconnected state, in which case\n   * it retains its disconnected state and its existing connections.\n   */\n  private _abort(type: PeerErrorType, message: string | Error): void {\n    logger.error(\"Aborting!\");\n\n    this.emitError(type, message);\n\n    if (!this._lastServerId) {\n      this.destroy();\n    } else {\n      this.disconnect();\n    }\n  }\n\n  /** Emits a typed error message. */\n  emitError(type: PeerErrorType, err: string | Error): void {\n    logger.error(\"Error:\", err);\n\n    let error: Error & { type?: PeerErrorType };\n\n    if (typeof err === \"string\") {\n      error = new Error(err);\n    } else {\n      error = err as Error;\n    }\n\n    error.type = type;\n\n    this.emit(PeerEventType.Error, error);\n  }\n\n  /**\n   * Destroys the Peer: closes all active connections as well as the connection\n   *  to the server.\n   * Warning: The peer can no longer create or accept connections after being\n   *  destroyed.\n   */\n  destroy(): void {\n    if (this.destroyed) {\n      return;\n    }\n\n    logger.log(`Destroy peer with ID:${this.id}`);\n\n    this.disconnect();\n    this._cleanup();\n\n    this._destroyed = true;\n\n    this.emit(PeerEventType.Close);\n  }\n\n  /** Disconnects every connection on this peer. */\n  private _cleanup(): void {\n    for (let peerId of this._connections.keys()) {\n      this._cleanupPeer(peerId);\n      this._connections.delete(peerId);\n    }\n\n    this.socket.removeAllListeners();\n  }\n\n  /** Closes all connections to this peer. */\n  private _cleanupPeer(peerId: string): void {\n    const connections = this._connections.get(peerId);\n\n    if (!connections) return;\n\n    for (let connection of connections) {\n      connection.close();\n    }\n  }\n\n  /**\n   * Disconnects the Peer's connection to the PeerServer. Does not close any\n   *  active connections.\n   * Warning: The peer can no longer create or accept connections after being\n   *  disconnected. It also cannot reconnect to the server.\n   */\n  disconnect(): void {\n    if (this.disconnected) {\n      return;\n    }\n\n    const currentId = this.id;\n\n    logger.log(`Disconnect peer with ID:${currentId}`);\n\n    this._disconnected = true;\n    this._open = false;\n\n    this.socket.close();\n\n    this._lastServerId = currentId;\n    this._id = null;\n\n    this.emit(PeerEventType.Disconnected, currentId);\n  }\n\n  /** Attempts to reconnect with the same ID. */\n  reconnect(): void {\n    if (this.disconnected && !this.destroyed) {\n      logger.log(`Attempting reconnection to server with ID ${this._lastServerId}`);\n      this._disconnected = false;\n      this._initialize(this._lastServerId!);\n    } else if (this.destroyed) {\n      throw new Error(\"This peer cannot reconnect to the server. It has already been destroyed.\");\n    } else if (!this.disconnected && !this.open) {\n      // Do nothing. We're still connecting the first time.\n      logger.error(\"In a hurry? We're still trying to make the initial connection!\");\n    } else {\n      throw new Error(`Peer ${this.id} cannot reconnect because it is not disconnected from the server!`);\n    }\n  }\n\n  /**\n   * Get a list of available peer IDs. If you're running your own server, you'll\n   * want to set allow_discovery: true in the PeerServer options. If you're using\n   * the cloud server, email team@peerjs.com to get the functionality enabled for\n   * your key.\n   */\n  listAllPeers(cb = (_: any[]) => { }): void {\n    this._api.listAllPeers()\n      .then(peers => cb(peers))\n      .catch(error => this._abort(PeerErrorType.ServerError, error));\n  }\n}\n","import { util } from \"./util\";\nimport { Peer } from \"./peer\";\n\nexport const peerjs = {\n  Peer,\n  util\n};\n\nexport default Peer;\n\n(<any>window).peerjs = peerjs;\n/** @deprecated Should use peerjs namespace */\n(<any>window).Peer = Peer;\n"]}
-\ No newline at end of file
-diff --git a/node_modules/peerjs/dist/servermessage.js b/node_modules/peerjs/dist/servermessage.js
-new file mode 100644
-index 0000000..3cee119
---- /dev/null
-+++ b/node_modules/peerjs/dist/servermessage.js
-@@ -0,0 +1,9 @@
-+"use strict";
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.ServerMessage = void 0;
-+var ServerMessage = /** @class */ (function () {
-+    function ServerMessage() {
-+    }
-+    return ServerMessage;
-+}());
-+exports.ServerMessage = ServerMessage;
-diff --git a/node_modules/peerjs/dist/socket.js b/node_modules/peerjs/dist/socket.js
-new file mode 100644
-index 0000000..fcc4000
---- /dev/null
-+++ b/node_modules/peerjs/dist/socket.js
-@@ -0,0 +1,155 @@
-+"use strict";
-+var __extends = (this && this.__extends) || (function () {
-+    var extendStatics = function (d, b) {
-+        extendStatics = Object.setPrototypeOf ||
-+            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
-+        return extendStatics(d, b);
-+    };
-+    return function (d, b) {
-+        if (typeof b !== "function" && b !== null)
-+            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
-+        extendStatics(d, b);
-+        function __() { this.constructor = d; }
-+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-+    };
-+})();
-+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
-+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
-+        to[j] = from[i];
-+    return to;
-+};
-+var __importDefault = (this && this.__importDefault) || function (mod) {
-+    return (mod && mod.__esModule) ? mod : { "default": mod };
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.Socket = void 0;
-+var eventemitter3_1 = require("eventemitter3");
-+var logger_1 = __importDefault(require("./logger"));
-+var enums_1 = require("./enums");
-+/**
-+ * An abstraction on top of WebSockets to provide fastest
-+ * possible connection for peers.
-+ */
-+var Socket = /** @class */ (function (_super) {
-+    __extends(Socket, _super);
-+    function Socket(secure, host, port, path, key, pingInterval) {
-+        if (pingInterval === void 0) { pingInterval = 5000; }
-+        var _this = _super.call(this) || this;
-+        _this.pingInterval = pingInterval;
-+        _this._disconnected = true;
-+        _this._messagesQueue = [];
-+        var wsProtocol = secure ? "wss://" : "ws://";
-+        _this._baseUrl = wsProtocol + host + ":" + port + path + "peerjs?key=" + key;
-+        return _this;
-+    }
-+    Socket.prototype.start = function (id, token) {
-+        var _this = this;
-+        this._id = id;
-+        var wsUrl = this._baseUrl + "&id=" + id + "&token=" + token;
-+        if (!!this._socket || !this._disconnected) {
-+            return;
-+        }
-+        this._socket = new WebSocket(wsUrl);
-+        this._disconnected = false;
-+        this._socket.onmessage = function (event) {
-+            var data;
-+            try {
-+                data = JSON.parse(event.data);
-+                logger_1.default.log("Server message received:", data);
-+            }
-+            catch (e) {
-+                logger_1.default.log("Invalid server message", event.data);
-+                return;
-+            }
-+            _this.emit(enums_1.SocketEventType.Message, data);
-+        };
-+        this._socket.onclose = function (event) {
-+            if (_this._disconnected) {
-+                return;
-+            }
-+            logger_1.default.log("Socket closed.", event);
-+            _this._cleanup();
-+            _this._disconnected = true;
-+            _this.emit(enums_1.SocketEventType.Disconnected);
-+        };
-+        // Take care of the queue of connections if necessary and make sure Peer knows
-+        // socket is open.
-+        this._socket.onopen = function () {
-+            if (_this._disconnected) {
-+                return;
-+            }
-+            _this._sendQueuedMessages();
-+            logger_1.default.log("Socket open");
-+            _this._scheduleHeartbeat();
-+        };
-+    };
-+    Socket.prototype._scheduleHeartbeat = function () {
-+        var _this = this;
-+        this._wsPingTimer = setTimeout(function () {
-+            _this._sendHeartbeat();
-+        }, this.pingInterval);
-+    };
-+    Socket.prototype._sendHeartbeat = function () {
-+        if (!this._wsOpen()) {
-+            logger_1.default.log("Cannot send heartbeat, because socket closed");
-+            return;
-+        }
-+        var message = JSON.stringify({ type: enums_1.ServerMessageType.Heartbeat });
-+        this._socket.send(message);
-+        this._scheduleHeartbeat();
-+    };
-+    /** Is the websocket currently open? */
-+    Socket.prototype._wsOpen = function () {
-+        return !!this._socket && this._socket.readyState === 1;
-+    };
-+    /** Send queued messages. */
-+    Socket.prototype._sendQueuedMessages = function () {
-+        //Create copy of queue and clear it,
-+        //because send method push the message back to queue if smth will go wrong
-+        var copiedQueue = __spreadArray([], this._messagesQueue);
-+        this._messagesQueue = [];
-+        for (var _i = 0, copiedQueue_1 = copiedQueue; _i < copiedQueue_1.length; _i++) {
-+            var message = copiedQueue_1[_i];
-+            this.send(message);
-+        }
-+    };
-+    /** Exposed send for DC & Peer. */
-+    Socket.prototype.send = function (data) {
-+        if (this._disconnected) {
-+            return;
-+        }
-+        // If we didn't get an ID yet, we can't yet send anything so we should queue
-+        // up these messages.
-+        if (!this._id) {
-+            this._messagesQueue.push(data);
-+            return;
-+        }
-+        if (!data.type) {
-+            this.emit(enums_1.SocketEventType.Error, "Invalid message");
-+            return;
-+        }
-+        if (!this._wsOpen()) {
-+            return;
-+        }
-+        var message = JSON.stringify(data);
-+        this._socket.send(message);
-+    };
-+    Socket.prototype.close = function () {
-+        if (this._disconnected) {
-+            return;
-+        }
-+        this._cleanup();
-+        this._disconnected = true;
-+    };
-+    Socket.prototype._cleanup = function () {
-+        if (this._socket) {
-+            this._socket.onopen = this._socket.onmessage = this._socket.onclose = null;
-+            this._socket.close();
-+            this._socket = undefined;
-+        }
-+        clearTimeout(this._wsPingTimer);
-+    };
-+    return Socket;
-+}(eventemitter3_1.EventEmitter));
-+exports.Socket = Socket;
-diff --git a/node_modules/peerjs/dist/supports.js b/node_modules/peerjs/dist/supports.js
-new file mode 100644
-index 0000000..92fe0df
---- /dev/null
-+++ b/node_modules/peerjs/dist/supports.js
-@@ -0,0 +1,64 @@
-+"use strict";
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.Supports = void 0;
-+var adapter_1 = require("./adapter");
-+exports.Supports = new /** @class */ (function () {
-+    function class_1() {
-+        this.isIOS = ['iPad', 'iPhone', 'iPod'].includes(navigator.platform);
-+        this.supportedBrowsers = ['firefox', 'chrome', 'safari'];
-+        this.minFirefoxVersion = 59;
-+        this.minChromeVersion = 72;
-+        this.minSafariVersion = 605;
-+    }
-+    class_1.prototype.isWebRTCSupported = function () {
-+        return typeof RTCPeerConnection !== 'undefined';
-+    };
-+    class_1.prototype.isBrowserSupported = function () {
-+        var browser = this.getBrowser();
-+        var version = this.getVersion();
-+        var validBrowser = this.supportedBrowsers.includes(browser);
-+        if (!validBrowser)
-+            return false;
-+        if (browser === 'chrome')
-+            return version >= this.minChromeVersion;
-+        if (browser === 'firefox')
-+            return version >= this.minFirefoxVersion;
-+        if (browser === 'safari')
-+            return !this.isIOS && version >= this.minSafariVersion;
-+        return false;
-+    };
-+    class_1.prototype.getBrowser = function () {
-+        return adapter_1.webRTCAdapter.browserDetails.browser;
-+    };
-+    class_1.prototype.getVersion = function () {
-+        return adapter_1.webRTCAdapter.browserDetails.version || 0;
-+    };
-+    class_1.prototype.isUnifiedPlanSupported = function () {
-+        var browser = this.getBrowser();
-+        var version = adapter_1.webRTCAdapter.browserDetails.version || 0;
-+        if (browser === 'chrome' && version < 72)
-+            return false;
-+        if (browser === 'firefox' && version >= 59)
-+            return true;
-+        if (!window.RTCRtpTransceiver || !('currentDirection' in RTCRtpTransceiver.prototype))
-+            return false;
-+        var tempPc;
-+        var supported = false;
-+        try {
-+            tempPc = new RTCPeerConnection();
-+            tempPc.addTransceiver('audio');
-+            supported = true;
-+        }
-+        catch (e) { }
-+        finally {
-+            if (tempPc) {
-+                tempPc.close();
-+            }
-+        }
-+        return supported;
-+    };
-+    class_1.prototype.toString = function () {
-+        return "Supports: \n    browser:" + this.getBrowser() + " \n    version:" + this.getVersion() + " \n    isIOS:" + this.isIOS + " \n    isWebRTCSupported:" + this.isWebRTCSupported() + " \n    isBrowserSupported:" + this.isBrowserSupported() + " \n    isUnifiedPlanSupported:" + this.isUnifiedPlanSupported();
-+    };
-+    return class_1;
-+}());
-diff --git a/node_modules/peerjs/dist/util.js b/node_modules/peerjs/dist/util.js
-new file mode 100644
-index 0000000..ce7f523
---- /dev/null
-+++ b/node_modules/peerjs/dist/util.js
-@@ -0,0 +1,150 @@
-+"use strict";
-+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
-+    if (k2 === undefined) k2 = k;
-+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
-+}) : (function(o, m, k, k2) {
-+    if (k2 === undefined) k2 = k;
-+    o[k2] = m[k];
-+}));
-+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
-+    Object.defineProperty(o, "default", { enumerable: true, value: v });
-+}) : function(o, v) {
-+    o["default"] = v;
-+});
-+var __importStar = (this && this.__importStar) || function (mod) {
-+    if (mod && mod.__esModule) return mod;
-+    var result = {};
-+    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
-+    __setModuleDefault(result, mod);
-+    return result;
-+};
-+Object.defineProperty(exports, "__esModule", { value: true });
-+exports.util = void 0;
-+var BinaryPack = __importStar(require("peerjs-js-binarypack"));
-+var supports_1 = require("./supports");
-+var DEFAULT_CONFIG = {
-+    iceServers: [
-+        { urls: "stun:stun.l.google.com:19302" },
-+        { urls: "turn:0.peerjs.com:3478", username: "peerjs", credential: "peerjsp" }
-+    ],
-+    sdpSemantics: "unified-plan"
-+};
-+exports.util = new /** @class */ (function () {
-+    function class_1() {
-+        this.CLOUD_HOST = "0.peerjs.com";
-+        this.CLOUD_PORT = 443;
-+        // Browsers that need chunking:
-+        this.chunkedBrowsers = { Chrome: 1, chrome: 1 };
-+        this.chunkedMTU = 16300; // The original 60000 bytes setting does not work when sending data from Firefox to Chrome, which is "cut off" after 16384 bytes and delivered individually.
-+        // Returns browser-agnostic default config
-+        this.defaultConfig = DEFAULT_CONFIG;
-+        this.browser = supports_1.Supports.getBrowser();
-+        this.browserVersion = supports_1.Supports.getVersion();
-+        // Lists which features are supported
-+        this.supports = (function () {
-+            var supported = {
-+                browser: supports_1.Supports.isBrowserSupported(),
-+                webRTC: supports_1.Supports.isWebRTCSupported(),
-+                audioVideo: false,
-+                data: false,
-+                binaryBlob: false,
-+                reliable: false,
-+            };
-+            if (!supported.webRTC)
-+                return supported;
-+            var pc;
-+            try {
-+                pc = new RTCPeerConnection(DEFAULT_CONFIG);
-+                supported.audioVideo = true;
-+                var dc = void 0;
-+                try {
-+                    dc = pc.createDataChannel("_PEERJSTEST", { ordered: true });
-+                    supported.data = true;
-+                    supported.reliable = !!dc.ordered;
-+                    // Binary test
-+                    try {
-+                        dc.binaryType = "blob";
-+                        supported.binaryBlob = !supports_1.Supports.isIOS;
-+                    }
-+                    catch (e) {
-+                    }
-+                }
-+                catch (e) {
-+                }
-+                finally {
-+                    //   @ts-ignore
-+                    if (dc) {
-+                        dc.close();
-+                    }
-+                }
-+            }
-+            catch (e) {
-+            }
-+            finally {
-+                //   @ts-ignore
-+                if (pc) {
-+                    pc.close();
-+                }
-+            }
-+            return supported;
-+        })();
-+        this.pack = BinaryPack.pack;
-+        this.unpack = BinaryPack.unpack;
-+        // Binary stuff
-+        this._dataCount = 1;
-+    }
-+    class_1.prototype.noop = function () { };
-+    // Ensure alphanumeric ids
-+    class_1.prototype.validateId = function (id) {
-+        // Allow empty ids
-+        return !id || /^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/.test(id);
-+    };
-+    class_1.prototype.chunk = function (blob) {
-+        var chunks = [];
-+        var size = blob.size;
-+        var total = Math.ceil(size / exports.util.chunkedMTU);
-+        var index = 0;
-+        var start = 0;
-+        while (start < size) {
-+            var end = Math.min(size, start + exports.util.chunkedMTU);
-+            var b = blob.slice(start, end);
-+            var chunk = {
-+                __peerData: this._dataCount,
-+                n: index,
-+                data: b,
-+                total: total,
-+            };
-+            chunks.push(chunk);
-+            start = end;
-+            index++;
-+        }
-+        this._dataCount++;
-+        return chunks;
-+    };
-+    class_1.prototype.blobToArrayBuffer = function (blob, cb) {
-+        var fr = new FileReader();
-+        fr.onload = function (evt) {
-+            if (evt.target) {
-+                cb(evt.target.result);
-+            }
-+        };
-+        fr.readAsArrayBuffer(blob);
-+        return fr;
-+    };
-+    class_1.prototype.binaryStringToArrayBuffer = function (binary) {
-+        var byteArray = new Uint8Array(binary.length);
-+        for (var i = 0; i < binary.length; i++) {
-+            byteArray[i] = binary.charCodeAt(i) & 0xff;
-+        }
-+        return byteArray.buffer;
-+    };
-+    class_1.prototype.randomToken = function () {
-+        return Math.random()
-+            .toString(36)
-+            .substr(2);
-+    };
-+    class_1.prototype.isSecure = function () {
-+        return location.protocol === "https:";
-+    };
-+    return class_1;
-+}());
-diff --git a/node_modules/peerjs/lib/baseconnection.ts b/node_modules/peerjs/lib/baseconnection.ts
-index 8256fed..6ba8577 100644
---- a/node_modules/peerjs/lib/baseconnection.ts
-+++ b/node_modules/peerjs/lib/baseconnection.ts
-@@ -7,8 +7,10 @@ export abstract class BaseConnection extends EventEmitter {
-   protected _open = false;
- 
-   readonly metadata: any;
-+  // @ts-ignore
-   connectionId: string;
- 
-+  // @ts-ignore
-   peerConnection: RTCPeerConnection;
- 
-   abstract get type(): ConnectionType;
-diff --git a/node_modules/peerjs/lib/dataconnection.ts b/node_modules/peerjs/lib/dataconnection.ts
-index aec3c05..a30e090 100644
---- a/node_modules/peerjs/lib/dataconnection.ts
-+++ b/node_modules/peerjs/lib/dataconnection.ts
-@@ -16,6 +16,7 @@ import { DataConnection as IDataConnection } from '../index';
- /**
-  * Wraps a DataChannel between two Peers.
-  */
-+// @ts-ignore
- export class DataConnection extends BaseConnection implements IDataConnection {
-   private static readonly ID_PREFIX = "dc_";
-   private static readonly MAX_BUFFERED_AMOUNT = 8 * 1024 * 1024;
-@@ -42,6 +43,7 @@ export class DataConnection extends BaseConnection implements IDataConnection {
-     }
-   } = {};
- 
-+  // @ts-ignore
-   private _dc: RTCDataChannel;
-   private _encodingQueue = new EncodingQueue();
- 
-@@ -120,6 +122,7 @@ export class DataConnection extends BaseConnection implements IDataConnection {
-       if (datatype === Blob) {
-         // Datatype should never be blob
-         util.blobToArrayBuffer(data as Blob, (ab) => {
-+  // @ts-ignore
-           const unpackedData = util.unpack(ab);
-           this.emit(ConnectionEventType.Data, unpackedData);
-         });
-@@ -179,12 +182,14 @@ export class DataConnection extends BaseConnection implements IDataConnection {
- 
-     if (this._negotiator) {
-       this._negotiator.cleanup();
-+  // @ts-ignore
-       this._negotiator = null;
-     }
- 
-     if (this.provider) {
-       this.provider._removeConnection(this);
- 
-+  // @ts-ignore
-       this.provider = null;
-     }
- 
-@@ -192,12 +197,14 @@ export class DataConnection extends BaseConnection implements IDataConnection {
-       this.dataChannel.onopen = null;
-       this.dataChannel.onmessage = null;
-       this.dataChannel.onclose = null;
-+  // @ts-ignore
-       this._dc = null;
-     }
- 
-     if (this._encodingQueue) {
-       this._encodingQueue.destroy();
-       this._encodingQueue.removeAllListeners();
-+  // @ts-ignore
-       this._encodingQueue = null;
-     }
- 
-diff --git a/node_modules/peerjs/lib/encodingQueue.ts b/node_modules/peerjs/lib/encodingQueue.ts
-index f0b3e40..7322ecf 100644
---- a/node_modules/peerjs/lib/encodingQueue.ts
-+++ b/node_modules/peerjs/lib/encodingQueue.ts
-@@ -59,6 +59,7 @@ export class EncodingQueue extends EventEmitter {
- 
-     this._processing = true;
- 
-+  // @ts-ignore
-     this.fileReader.readAsArrayBuffer(this.queue.shift());
-   }
- }
-\ No newline at end of file
-diff --git a/node_modules/peerjs/lib/index.ts b/node_modules/peerjs/lib/index.ts
-new file mode 100644
-index 0000000..a613237
---- /dev/null
-+++ b/node_modules/peerjs/lib/index.ts
-@@ -0,0 +1,15 @@
-+export * from './adapter';
-+export * from './api';
-+export * from './baseconnection';
-+export * from './dataconnection';
-+export * from './encodingQueue';
-+export * from './enums';
-+export * from './exports';
-+export * from './logger';
-+export * from './mediaconnection';
-+export * from './negotiator';
-+export * from './peer';
-+export * from './servermessage';
-+export * from './socket';
-+export * from './supports';
-+export * from './util';
-diff --git a/node_modules/peerjs/lib/mediaconnection.ts b/node_modules/peerjs/lib/mediaconnection.ts
-index 2f5d0ff..df160e2 100644
---- a/node_modules/peerjs/lib/mediaconnection.ts
-+++ b/node_modules/peerjs/lib/mediaconnection.ts
-@@ -15,6 +15,7 @@ export class MediaConnection extends BaseConnection {
- 
-   private _negotiator: Negotiator;
-   private _localStream: MediaStream;
-+//   @ts-ignore
-   private _remoteStream: MediaStream;
- 
-   get type() {
-@@ -42,6 +43,7 @@ export class MediaConnection extends BaseConnection {
-     }
-   }
- 
-+//   @ts-ignore
-   addStream(remoteStream) {
-     logger.log("Receiving stream", remoteStream);
- 
-@@ -101,15 +103,19 @@ export class MediaConnection extends BaseConnection {
-   close(): void {
-     if (this._negotiator) {
-       this._negotiator.cleanup();
-+//   @ts-ignore
-       this._negotiator = null;
-     }
- 
-+//   @ts-ignore
-     this._localStream = null;
-+//   @ts-ignore
-     this._remoteStream = null;
- 
-     if (this.provider) {
-       this.provider._removeConnection(this);
- 
-+//   @ts-ignore
-       this.provider = null;
-     }
- 
-diff --git a/node_modules/peerjs/lib/negotiator.ts b/node_modules/peerjs/lib/negotiator.ts
-index 26e7044..226f8b8 100644
---- a/node_modules/peerjs/lib/negotiator.ts
-+++ b/node_modules/peerjs/lib/negotiator.ts
-@@ -143,6 +143,7 @@ export class Negotiator {
-       const stream = evt.streams[0];
-       const connection = provider.getConnection(peerId, connectionId);
- 
-+//   @ts-ignore
-       if (connection.type === ConnectionType.Media) {
-         const mediaConnection = <MediaConnection>connection;
- 
-@@ -160,6 +161,7 @@ export class Negotiator {
-       return;
-     }
- 
-+//   @ts-ignore
-     this.connection.peerConnection = null;
- 
-     //unsubscribe from all PeerConnection's events
-diff --git a/node_modules/peerjs/lib/peer.ts b/node_modules/peerjs/lib/peer.ts
-index 8f11659..565733b 100644
---- a/node_modules/peerjs/lib/peer.ts
-+++ b/node_modules/peerjs/lib/peer.ts
-@@ -72,6 +72,7 @@ export class Peer extends EventEmitter {
-   get connections(): Object {
-     const plainConnections = Object.create(null);
- 
-+//   @ts-ignore
-     for (let [k, v] of this._connections) {
-       plainConnections[k] = v;
-     }
-@@ -312,6 +313,7 @@ export class Peer extends EventEmitter {
-       this._lostMessages.set(connectionId, []);
-     }
- 
-+//   @ts-ignore
-     this._lostMessages.get(connectionId).push(message);
-   }
- 
-@@ -344,6 +346,7 @@ export class Peer extends EventEmitter {
-         PeerErrorType.Disconnected,
-         "Cannot connect to new Peer after disconnecting from server."
-       );
-+//   @ts-ignore
-       return;
-     }
- 
-@@ -367,6 +370,7 @@ export class Peer extends EventEmitter {
-         PeerErrorType.Disconnected,
-         "Cannot connect to new Peer after disconnecting from server."
-       );
-+//   @ts-ignore
-       return;
-     }
- 
-@@ -374,6 +378,7 @@ export class Peer extends EventEmitter {
-       logger.error(
-         "To call a peer, you must provide a stream from your browser's `getUserMedia`."
-       );
-+//   @ts-ignore
-       return;
-     }
- 
-@@ -391,6 +396,7 @@ export class Peer extends EventEmitter {
-     if (!this._connections.has(peerId)) {
-       this._connections.set(peerId, []);
-     }
-+//   @ts-ignore
-     this._connections.get(peerId).push(connection);
-   }
- 
-@@ -489,6 +495,7 @@ export class Peer extends EventEmitter {
- 
-   /** Disconnects every connection on this peer. */
-   private _cleanup(): void {
-+//   @ts-ignore
-     for (let peerId of this._connections.keys()) {
-       this._cleanupPeer(peerId);
-       this._connections.delete(peerId);
-diff --git a/node_modules/peerjs/lib/peerjs.min.ts b/node_modules/peerjs/lib/peerjs.min.ts
-new file mode 100644
-index 0000000..ea465c2
---- /dev/null
-+++ b/node_modules/peerjs/lib/peerjs.min.ts
-@@ -0,0 +1 @@
-+export * from './index';
-diff --git a/node_modules/peerjs/lib/servermessage.ts b/node_modules/peerjs/lib/servermessage.ts
-index 7e0b577..4bcbbca 100644
---- a/node_modules/peerjs/lib/servermessage.ts
-+++ b/node_modules/peerjs/lib/servermessage.ts
-@@ -1,7 +1,9 @@
- import { ServerMessageType } from "./enums";
- 
- export class ServerMessage {
-+  // @ts-ignore
-   type: ServerMessageType;
-   payload: any;
-+  // @ts-ignore
-   src: string;
- }
-diff --git a/node_modules/peerjs/lib/supports.ts b/node_modules/peerjs/lib/supports.ts
-index ff5b6d6..6a7e431 100644
---- a/node_modules/peerjs/lib/supports.ts
-+++ b/node_modules/peerjs/lib/supports.ts
-@@ -43,7 +43,7 @@ export const Supports = new class {
-     if (browser === 'firefox' && version >= 59) return true;
-     if (!window.RTCRtpTransceiver || !('currentDirection' in RTCRtpTransceiver.prototype)) return false;
- 
--    let tempPc: RTCPeerConnection;
-+    let tempPc: RTCPeerConnection | undefined;
-     let supported = false;
- 
-     try {
-diff --git a/node_modules/peerjs/lib/util.ts b/node_modules/peerjs/lib/util.ts
-index c2cf7a1..d6ec8f2 100644
---- a/node_modules/peerjs/lib/util.ts
-+++ b/node_modules/peerjs/lib/util.ts
-@@ -61,12 +61,14 @@ export const util = new class {
-         }
-       } catch (e) {
-       } finally {
-+//   @ts-ignore
-         if (dc) {
-           dc.close();
-         }
-       }
-     } catch (e) {
-     } finally {
-+//   @ts-ignore
-       if (pc) {
-         pc.close();
-       }
-diff --git a/node_modules/peerjs/tsconfig.json b/node_modules/peerjs/tsconfig.json
-new file mode 100644
-index 0000000..c138caf
---- /dev/null
-+++ b/node_modules/peerjs/tsconfig.json
-@@ -0,0 +1,75 @@
-+{
-+  "compilerOptions": {
-+    /* Visit https://aka.ms/tsconfig.json to read more about this file */
-+
-+    /* Basic Options */
-+    // "incremental": true,                         /* Enable incremental compilation */
-+    "target": "es5",                                /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
-+    "module": "commonjs",                           /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
-+    // "lib": [],                                   /* Specify library files to be included in the compilation. */
-+    // "allowJs": true,                             /* Allow javascript files to be compiled. */
-+    // "checkJs": true,                             /* Report errors in .js files. */
-+    // "jsx": "preserve",                           /* Specify JSX code generation: 'preserve', 'react-native', 'react', 'react-jsx' or 'react-jsxdev'. */
-+    // "declaration": true,                         /* Generates corresponding '.d.ts' file. */
-+    // "declarationMap": true,                      /* Generates a sourcemap for each corresponding '.d.ts' file. */
-+    // "sourceMap": true,                           /* Generates corresponding '.map' file. */
-+    // "outFile": "./",                             /* Concatenate and emit output to single file. */
-+    "outDir": "./dist",                              /* Redirect output structure to the directory. */
-+    // "rootDir": "./",                             /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
-+    // "composite": true,                           /* Enable project compilation */
-+    // "tsBuildInfoFile": "./",                     /* Specify file to store incremental compilation information */
-+    // "removeComments": true,                      /* Do not emit comments to output. */
-+    // "noEmit": true,                              /* Do not emit outputs. */
-+    // "importHelpers": true,                       /* Import emit helpers from 'tslib'. */
-+    // "downlevelIteration": true,                  /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
-+    // "isolatedModules": true,                     /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
-+
-+    /* Strict Type-Checking Options */
-+    "strict": true,                                 /* Enable all strict type-checking options. */
-+    // "noImplicitAny": true,                       /* Raise error on expressions and declarations with an implied 'any' type. */
-+    // "strictNullChecks": true,                    /* Enable strict null checks. */
-+    // "strictFunctionTypes": true,                 /* Enable strict checking of function types. */
-+    // "strictBindCallApply": true,                 /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
-+    // "strictPropertyInitialization": true,        /* Enable strict checking of property initialization in classes. */
-+    // "noImplicitThis": true,                      /* Raise error on 'this' expressions with an implied 'any' type. */
-+    // "alwaysStrict": true,                        /* Parse in strict mode and emit "use strict" for each source file. */
-+
-+    /* Additional Checks */
-+    "noUnusedLocals": false,                      /* Report errors on unused locals. */
-+    "noUnusedParameters": false,                  /* Report errors on unused parameters. */
-+    "noImplicitReturns": false,                   /* Report error when not all code paths in function return a value. */
-+    "noFallthroughCasesInSwitch": false,          /* Report errors for fallthrough cases in switch statement. */
-+    "noUncheckedIndexedAccess": false,            /* Include 'undefined' in index signature results */
-+    "noPropertyAccessFromIndexSignature": false,  /* Require undeclared properties from index signatures to use element accesses. */
-+
-+    /* Module Resolution Options */
-+    // "moduleResolution": "node",                  /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
-+    // "baseUrl": "./",                             /* Base directory to resolve non-absolute module names. */
-+    // "paths": {},                                 /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
-+    // "rootDirs": [],                              /* List of root folders whose combined content represents the structure of the project at runtime. */
-+    // "typeRoots": [],                             /* List of folders to include type definitions from. */
-+    // "types": [],                                 /* Type declaration files to be included in compilation. */
-+    // "allowSyntheticDefaultImports": true,        /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
-+    "esModuleInterop": true,                        /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
-+    // "preserveSymlinks": true,                    /* Do not resolve the real path of symlinks. */
-+    // "allowUmdGlobalAccess": true,                /* Allow accessing UMD globals from modules. */
-+
-+    /* Source Map Options */
-+    // "sourceRoot": "",                            /* Specify the location where debugger should locate TypeScript files instead of source locations. */
-+    // "mapRoot": "",                               /* Specify the location where debugger should locate map files instead of generated locations. */
-+    // "inlineSourceMap": true,                     /* Emit a single file with source maps instead of having a separate file. */
-+    // "inlineSources": true,                       /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
-+
-+    /* Experimental Options */
-+    // "experimentalDecorators": true,              /* Enables experimental support for ES7 decorators. */
-+    // "emitDecoratorMetadata": true,               /* Enables experimental support for emitting type metadata for decorators. */
-+
-+    /* Advanced Options */
-+    "skipLibCheck": true,                           /* Skip type checking of declaration files. */
-+    "forceConsistentCasingInFileNames": true        /* Disallow inconsistently-cased references to the same file. */
-+  },
-+  "include": [
-+    "index.d.ts",
-+    "lib"
-+  ]
-+}
diff --git a/client/src/index.js b/client/src/index.js
index 361efcad4..4d8a87e16 100644
--- a/client/src/index.js
+++ b/client/src/index.js
@@ -14,7 +14,6 @@ import { persistor, store } from "./redux/store";
 import reportWebVitals from "./reportWebVitals";
 import "./translations/i18n";
 import "./utils/CleanAxios";
-require("dotenv").config();
 
 // Dinero.defaultCurrency = "CAD";
 // Dinero.globalLocale = "en-CA";
diff --git a/client/yarn.lock b/client/yarn.lock
index 5a8eb4654..5041c075b 100644
--- a/client/yarn.lock
+++ b/client/yarn.lock
@@ -2435,28 +2435,6 @@
     "@babel/runtime" "^7.18.6"
     hoist-non-react-statics "^3.3.2"
 
-"@testing-library/cypress@^8.0.3":
-  version "8.0.3"
-  resolved "https://registry.yarnpkg.com/@testing-library/cypress/-/cypress-8.0.3.tgz#24ab34df34d7896866603ade705afbdd186e273c"
-  integrity sha512-nY2YaSbmuPo5k6kL0iLj/pGPPfka3iwb3kpTx8QN/vOCns92Saz9wfACqB8FJzcR7+lfA4d5HUOWqmTddBzczg==
-  dependencies:
-    "@babel/runtime" "^7.14.6"
-    "@testing-library/dom" "^8.1.0"
-
-"@testing-library/dom@^8.1.0":
-  version "8.16.0"
-  resolved "https://registry.yarnpkg.com/@testing-library/dom/-/dom-8.16.0.tgz#d6fc50250aed17b1035ca1bd64655e342db3936a"
-  integrity sha512-uxF4zmnLHHDlmW4l+0WDjcgLVwCvH+OVLpD8Dfp+Bjfz85prwxWGbwXgJdLtkgjD0qfOzkJF9SmA6YZPsMYX4w==
-  dependencies:
-    "@babel/code-frame" "^7.10.4"
-    "@babel/runtime" "^7.12.5"
-    "@types/aria-query" "^4.2.0"
-    aria-query "^5.0.0"
-    chalk "^4.1.0"
-    dom-accessibility-api "^0.5.9"
-    lz-string "^1.4.4"
-    pretty-format "^27.0.2"
-
 "@tootallnate/once@1":
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/@tootallnate/once/-/once-1.1.2.tgz#ccb91445360179a04e7fe6aff78c00ffc1eeaf82"
@@ -2482,11 +2460,6 @@
   resolved "https://registry.yarnpkg.com/@tsconfig/node16/-/node16-1.0.3.tgz#472eaab5f15c1ffdd7f8628bd4c4f753995ec79e"
   integrity sha512-yOlFc+7UtL/89t2ZhjPvvB/DeAr3r+Dq58IgzsFkOAvVC6NMJXmCGjbptdXdR9qsX7pKcTL+s87FtYREi2dEEQ==
 
-"@types/aria-query@^4.2.0":
-  version "4.2.2"
-  resolved "https://registry.yarnpkg.com/@types/aria-query/-/aria-query-4.2.2.tgz#ed4e0ad92306a704f9fb132a0cfcf77486dbe2bc"
-  integrity sha512-HnYpAE1Y6kRyKM/XkEuiRQhTHvkzMBurTHnpFLYLBGPIylZNPs9jJcuOOYWxPLJCSEtmZT0Y8rHDokKN7rRTig==
-
 "@types/babel__core@^7.0.0", "@types/babel__core@^7.1.12", "@types/babel__core@^7.1.7":
   version "7.1.19"
   resolved "https://registry.yarnpkg.com/@types/babel__core/-/babel__core-7.1.19.tgz#7b497495b7d1b4812bdb9d02804d0576f43ee460"
@@ -2628,9 +2601,9 @@
   integrity sha512-z+2vB6yDt1fNwKOeGbckpmirO+VBDuQqecXkgeIqDlaOtmKn6hPR/viQ8cxCfqLU4fTlvM3+YjM367TukWdxpg==
 
 "@types/node@^14.14.31":
-  version "14.18.22"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-14.18.22.tgz#fd2a15dca290fc9ad565b672fde746191cd0c6e6"
-  integrity sha512-qzaYbXVzin6EPjghf/hTdIbnVW1ErMx8rPzwRNJhlbyJhu2SyqlvjGOY/tbUt6VFyzg56lROcOeSQRInpt63Yw==
+  version "14.18.35"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-14.18.35.tgz#879c4659cb7b3fe515844f029c75079c941bb65c"
+  integrity sha512-2ATO8pfhG1kDvw4Lc4C0GXIMSQFFJBCo/R1fSgTwmUlq5oy95LXyjDQinsRVgQY6gp6ghh3H91wk9ES5/5C+Tw==
 
 "@types/normalize-package-data@^2.4.0":
   version "2.4.1"
@@ -3223,11 +3196,6 @@ ansi-styles@^4.0.0, ansi-styles@^4.1.0:
   dependencies:
     color-convert "^2.0.1"
 
-ansi-styles@^5.0.0:
-  version "5.2.0"
-  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-5.2.0.tgz#07449690ad45777d1924ac2abb2fc8895dba836b"
-  integrity sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==
-
 antd@^4.22.3:
   version "4.22.3"
   resolved "https://registry.yarnpkg.com/antd/-/antd-4.22.3.tgz#c6d4ced17e9c21b55c6234595d962c5f9d6768db"
@@ -3345,11 +3313,6 @@ aria-query@^4.2.2:
     "@babel/runtime" "^7.10.2"
     "@babel/runtime-corejs3" "^7.10.2"
 
-aria-query@^5.0.0:
-  version "5.0.0"
-  resolved "https://registry.yarnpkg.com/aria-query/-/aria-query-5.0.0.tgz#210c21aaf469613ee8c9a62c7f86525e058db52c"
-  integrity sha512-V+SM7AbUwJ+EBnB8+DXs0hPZHO0W6pqBcc0dW90OwtVG02PswOu/teuARoLQjdDOH+t9pJgGnW5/Qmouf3gPJg==
-
 arity-n@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/arity-n/-/arity-n-1.0.4.tgz#d9e76b11733e08569c0847ae7b39b2860b30b745"
@@ -4390,9 +4353,9 @@ ci-info@^2.0.0:
   integrity sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==
 
 ci-info@^3.2.0:
-  version "3.3.2"
-  resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-3.3.2.tgz#6d2967ffa407466481c6c90b6e16b3098f080128"
-  integrity sha512-xmDt/QIAdeZ9+nfdPsaBCpMvHNLFiLdjj59qjqn+6iPe6YmHGQ35sBnQ8uslRBXFmXkiZQOJRjvQeoGppoTjjg==
+  version "3.7.0"
+  resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-3.7.0.tgz#6d01b3696c59915b6ce057e4aa4adfc2fa25f5ef"
+  integrity sha512-2CpRNYmImPx+RXKLq6jko/L07phmS9I02TyqkcNU20GCF/GgaWvc58hPtjxDX8lPpkdwc9sNh72V9k00S7ezog==
 
 cipher-base@^1.0.0, cipher-base@^1.0.1, cipher-base@^1.0.3:
   version "1.0.4"
@@ -4442,9 +4405,9 @@ cli-cursor@^3.1.0:
     restore-cursor "^3.1.0"
 
 cli-table3@~0.6.1:
-  version "0.6.2"
-  resolved "https://registry.yarnpkg.com/cli-table3/-/cli-table3-0.6.2.tgz#aaf5df9d8b5bf12634dc8b3040806a0c07120d2a"
-  integrity sha512-QyavHCaIC80cMivimWu4aWHilIpiDpfm3hGmqAmXVL1UsnbLuBSMd21hTX6VY4ZSDSM73ESLeF8TOYId3rBTbw==
+  version "0.6.3"
+  resolved "https://registry.yarnpkg.com/cli-table3/-/cli-table3-0.6.3.tgz#61ab765aac156b52f222954ffc607a6f01dbeeb2"
+  integrity sha512-w5Jac5SykAeZJKntOxJCrm63Eg5/4dhMWIcuTbo9rpE+brgaSZo0RuNJZeOyMgsUdhDeojvgyQLmjI+K50ZGyg==
   dependencies:
     string-width "^4.2.0"
   optionalDependencies:
@@ -5164,10 +5127,10 @@ cyclist@^1.0.1:
   resolved "https://registry.yarnpkg.com/cyclist/-/cyclist-1.0.1.tgz#596e9698fd0c80e12038c2b82d6eb1b35b6224d9"
   integrity sha512-NJGVKPS81XejHcLhaLJS7plab0fK3slPh11mESeeDq2W4ZI5kUKK/LRRdVDvjJseojbPB7ZwjnyOybg3Igea/A==
 
-cypress@^10.3.1:
-  version "10.3.1"
-  resolved "https://registry.yarnpkg.com/cypress/-/cypress-10.3.1.tgz#7fab4ef43481c05a9a17ebe9a0ec860e15b95a19"
-  integrity sha512-As9HrExjAgpgjCnbiQCuPdw5sWKx5HUJcK2EOKziu642akwufr/GUeqL5UnCPYXTyyibvEdWT/pSC2qnGW/e5w==
+cypress@^12.2.0:
+  version "12.2.0"
+  resolved "https://registry.yarnpkg.com/cypress/-/cypress-12.2.0.tgz#86ddc1ecfffadf57a8689e211cfb4437735f4e92"
+  integrity sha512-kvl95ri95KK8mAy++tEU/wUgzAOMiIciZSL97LQvnOinb532m7dGvwN0mDSIGbOd71RREtmT9o4h088RjK5pKw==
   dependencies:
     "@cypress/request" "^2.88.10"
     "@cypress/xvfb" "^1.2.4"
@@ -5188,7 +5151,7 @@ cypress@^10.3.1:
     dayjs "^1.10.4"
     debug "^4.3.2"
     enquirer "^2.3.6"
-    eventemitter2 "^6.4.3"
+    eventemitter2 "6.4.7"
     execa "4.1.0"
     executable "^4.1.1"
     extract-zip "2.0.1"
@@ -5322,11 +5285,16 @@ date-fns@2.x:
   resolved "https://registry.yarnpkg.com/date-fns/-/date-fns-2.29.1.tgz#9667c2615525e552b5135a3116b95b1961456e60"
   integrity sha512-dlLD5rKaKxpFdnjrs+5azHDFOPEu4ANy/LTh04A1DTzMM7qoajmKCBc8pkKRFT41CNzw+4gQh79X5C+Jq27HAw==
 
-dayjs@1.x, dayjs@^1.10.4:
+dayjs@1.x:
   version "1.11.4"
   resolved "https://registry.yarnpkg.com/dayjs/-/dayjs-1.11.4.tgz#3b3c10ca378140d8917e06ebc13a4922af4f433e"
   integrity sha512-Zj/lPM5hOvQ1Bf7uAvewDaUcsJoI6JmNqmHhHl3nyumwe0XHwt8sWdOVAPACJzCebL8gQCi+K49w7iKWnGwX9g==
 
+dayjs@^1.10.4:
+  version "1.11.7"
+  resolved "https://registry.yarnpkg.com/dayjs/-/dayjs-1.11.7.tgz#4b296922642f70999544d1144a2c25730fce63e2"
+  integrity sha512-+Yw9U6YO5TQohxLcIkrXBeY73WP3ejHWVvx8XCk3gxvQDCTEmS48ZrSZCKciI7Bhl/uCMyxYtE9UqRILmFphkQ==
+
 debug@2.6.9, debug@^2.2.0, debug@^2.3.3, debug@^2.6.0, debug@^2.6.9:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
@@ -5579,11 +5547,6 @@ doctrine@^3.0.0:
   dependencies:
     esutils "^2.0.2"
 
-dom-accessibility-api@^0.5.9:
-  version "0.5.14"
-  resolved "https://registry.yarnpkg.com/dom-accessibility-api/-/dom-accessibility-api-0.5.14.tgz#56082f71b1dc7aac69d83c4285eef39c15d93f56"
-  integrity sha512-NMt+m9zFMPZe0JcY9gN224Qvk6qLIdqex29clBvc/y75ZBX9YA9wNK3frsYvu2DI1xcCIwxwnX+TlsJ2DSOADg==
-
 dom-align@^1.7.0:
   version "1.12.3"
   resolved "https://registry.yarnpkg.com/dom-align/-/dom-align-1.12.3.tgz#a36d02531dae0eefa2abb0c4db6595250526f103"
@@ -5699,11 +5662,6 @@ dotenv@8.2.0:
   resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-8.2.0.tgz#97e619259ada750eea3e4ea3e26bceea5424b16a"
   integrity sha512-8sJ78ElpbDJBHNeBzUbUVLsqKdccaa/BXF1uPTw3GrvQTBgrQrtObr2mUrE38vzYd8cEv+m/JBfDLioYcfXoaw==
 
-dotenv@^16.0.1:
-  version "16.0.1"
-  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-16.0.1.tgz#8f8f9d94876c35dac989876a5d3a82a267fdce1d"
-  integrity sha512-1K6hR6wtk2FviQ4kEiSjFiH5rpzEVi8WW0x96aztHVMhEspNpc4DVOUTEHtEva5VThQ8IaBX1Pe4gSzpVVUsKQ==
-
 duplexer@^0.1.1, duplexer@^0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/duplexer/-/duplexer-0.1.2.tgz#3abe43aef3835f8ae077d136ddce0f276b0400e6"
@@ -6023,13 +5981,6 @@ eslint-module-utils@^2.7.3:
     debug "^3.2.7"
     find-up "^2.1.0"
 
-eslint-plugin-cypress@^2.12.1:
-  version "2.12.1"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-cypress/-/eslint-plugin-cypress-2.12.1.tgz#9aeee700708ca8c058e00cdafe215199918c2632"
-  integrity sha512-c2W/uPADl5kospNDihgiLc7n87t5XhUbFDoTl6CfVkmG+kDAb5Ux10V9PoLPu9N+r7znpc+iQlcmAqT1A/89HA==
-  dependencies:
-    globals "^11.12.0"
-
 eslint-plugin-flowtype@^5.2.0:
   version "5.10.0"
   resolved "https://registry.yarnpkg.com/eslint-plugin-flowtype/-/eslint-plugin-flowtype-5.10.0.tgz#7764cc63940f215bf3f0bd2d9a1293b2b9b2b4bb"
@@ -6271,10 +6222,10 @@ etag@~1.8.1:
   resolved "https://registry.yarnpkg.com/etag/-/etag-1.8.1.tgz#41ae2eeb65efa62268aebfea83ac7d79299b0887"
   integrity sha512-aIL5Fx7mawVa300al2BnEE4iNvo1qETxLrPI/o05L7z6go7fCw1J6EQmbK4FmJ2AS7kgVF/KEZWufBfdClMcPg==
 
-eventemitter2@^6.4.3:
-  version "6.4.6"
-  resolved "https://registry.yarnpkg.com/eventemitter2/-/eventemitter2-6.4.6.tgz#92d56569cc147a4d9b9da9e942e89b20ce236b0a"
-  integrity sha512-OHqo4wbHX5VbvlbB6o6eDwhYmiTjrpWACjF8Pmof/GTD6rdBNdZFNck3xlhqOiQFGCOoq3uzHvA0cQpFHIGVAQ==
+eventemitter2@6.4.7:
+  version "6.4.7"
+  resolved "https://registry.yarnpkg.com/eventemitter2/-/eventemitter2-6.4.7.tgz#a7f6c4d7abf28a14c1ef3442f21cb306a054271d"
+  integrity sha512-tYUSVOGeQPKt/eC1ABfhHy5Xd96N3oIijJvN3O9+TsC28T5V9yX9oEfEK5faP0EFSNVOG97qtAS68GBrQB2hDg==
 
 eventemitter3@^3.1.0:
   version "3.1.2"
@@ -7012,9 +6963,9 @@ glob@^7.0.3, glob@^7.1.1, glob@^7.1.2, glob@^7.1.3, glob@^7.1.4, glob@^7.1.6:
     path-is-absolute "^1.0.0"
 
 global-dirs@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/global-dirs/-/global-dirs-3.0.0.tgz#70a76fe84ea315ab37b1f5576cbde7d48ef72686"
-  integrity sha512-v8ho2DS5RiCjftj1nD9NmnfaOzTdud7RRnVd9kFNOjqZbISlx5DQ+OrTkywgd0dIt7oFCvKetZSHoHcP3sDdiA==
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/global-dirs/-/global-dirs-3.0.1.tgz#0c488971f066baceda21447aecb1a8b911d22485"
+  integrity sha512-NBcGGFbBA9s1VzD41QXDG+3++t9Mn5t1FpLdhESY6oKY4gYTFpX4wO3sqGUa0Srjtbfj3szX0RnemmrVRUdULA==
   dependencies:
     ini "2.0.0"
 
@@ -7039,7 +6990,7 @@ globalize@^0.1.1:
   resolved "https://registry.yarnpkg.com/globalize/-/globalize-0.1.1.tgz#4d04ba65a580a8b0bdcc9ed974aeb497b9c80a56"
   integrity sha512-5e01v8eLGfuQSOvx2MsDMOWS0GFtCx1wPzQSmcHw4hkxFzrQDBO3Xwg/m8Hr/7qXMrHeOIE29qWVzyv06u1TZA==
 
-globals@^11.1.0, globals@^11.12.0:
+globals@^11.1.0:
   version "11.12.0"
   resolved "https://registry.yarnpkg.com/globals/-/globals-11.12.0.tgz#ab8795338868a0babd8525758018c2a7eb95c42e"
   integrity sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==
@@ -9182,11 +9133,6 @@ luxon@^2.4.0:
   resolved "https://registry.yarnpkg.com/luxon/-/luxon-2.5.0.tgz#098090f67d690b247e83c090267a60b1aa8ea96c"
   integrity sha512-IDkEPB80Rb6gCAU+FEib0t4FeJ4uVOuX1CQ9GsvU3O+JAGIgu0J7sf1OarXKaKDygTZIoJyU6YdZzTFRu+YR0A==
 
-lz-string@^1.4.4:
-  version "1.4.4"
-  resolved "https://registry.yarnpkg.com/lz-string/-/lz-string-1.4.4.tgz#c0d8eaf36059f705796e1e344811cf4c498d3a26"
-  integrity sha512-0ckx7ZHRPqb0oUm8zNr+90mtf9DQB60H1wMCjBtfi62Kl3a7JbHob6gA2bC+xRvZoOL+1hzUK8jeuEIQE8svEQ==
-
 magic-string@^0.25.0, magic-string@^0.25.7:
   version "0.25.9"
   resolved "https://registry.yarnpkg.com/magic-string/-/magic-string-0.25.9.tgz#de7f9faf91ef8a1c91d02c2e5314c8277dbcdd1c"
@@ -11074,15 +11020,6 @@ pretty-format@^26.6.0, pretty-format@^26.6.2:
     ansi-styles "^4.0.0"
     react-is "^17.0.1"
 
-pretty-format@^27.0.2:
-  version "27.5.1"
-  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-27.5.1.tgz#2181879fdea51a7a5851fb39d920faa63f01d88e"
-  integrity sha512-Qb1gy5OrP5+zDf2Bvnzdl3jsTf1qXVMazbvCoKhtKqVs4/YK4ozX4gKQJJVyNe+cajNPn0KoC0MC3FUmaHWEmQ==
-  dependencies:
-    ansi-regex "^5.0.1"
-    ansi-styles "^5.0.0"
-    react-is "^17.0.1"
-
 preval.macro@^5.0.0:
   version "5.0.0"
   resolved "https://registry.yarnpkg.com/preval.macro/-/preval.macro-5.0.0.tgz#bb9e0e0cd06aee094dd84eed89851b5a7337cc2f"
@@ -12684,9 +12621,9 @@ run-queue@^1.0.0, run-queue@^1.0.3:
     aproba "^1.1.1"
 
 rxjs@^7.5.1:
-  version "7.5.6"
-  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-7.5.6.tgz#0446577557862afd6903517ce7cae79ecb9662bc"
-  integrity sha512-dnyv2/YsXhnm461G+R/Pe5bWP41Nm6LBXEYWI6eiFP4fiwx6WRI/CD0zbdVAudd9xwLEF2IDcKXLHit0FYjUzw==
+  version "7.8.0"
+  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-7.8.0.tgz#90a938862a82888ff4c7359811a595e14e1e09a4"
+  integrity sha512-F2+gxDshqmIub1KdvZkaEfGDwLNpPvk9Fs6LD/MyQxNgMds/WH9OdDDXOmxUZpME+iSK3rQCctkL0DYyytUqMg==
   dependencies:
     tslib "^2.1.0"