Change serverless to typescript.

serverless/package.json

@@ -2,8 +2,14 @@
   "name": "serverless",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "dist/index.js",
   "scripts": {
+    "build": "tsc",
+    "lint": "eslint 'src/**/*.ts'",
+    "lint:fix": "eslint 'src/**/*.ts' --fix",
+    "format": "prettier --write 'src/**/*.ts'",
+    "format:check": "prettier --check 'src/**/*.ts'",
+    "type-check": "tsc --noEmit",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "keywords": [],
@@ -15,5 +21,20 @@
     "@aws-sdk/s3-request-presigner": "^3.965.0",
     "axios": "^1.13.2",
     "form-data": "^4.0.1"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.39.2",
+    "@types/aws-lambda": "^8.10.159",
+    "@types/node": "^25.0.8",
+    "@typescript-eslint/eslint-plugin": "^8.53.0",
+    "@typescript-eslint/parser": "^8.53.0",
+    "esbuild": "^0.27.2",
+    "eslint": "^9.39.2",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-prettier": "^5.5.4",
+    "prettier": "^3.7.4",
+    "serverless-esbuild": "^1.57.0",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.9.3"
   }
 }