Add watcher status and additional typing.

src/main/decoder/decode-stl.ts

@@ -6,7 +6,7 @@ import errorTypeCheck from "../../util/errorTypeCheck";
 import { DecodedStl, DecodedStlLine } from "./decode-stl.interface";
 
 const DecodeStl = async (
-  extensionlessFilePath: string
+  extensionlessFilePath: string,
 ): Promise<DecodedStl> => {
   let dbf: DBFFile | null = null;
   try {
@@ -47,7 +47,7 @@ const DecodeStl = async (
         "TTL_TYPAMT",
         "TTL_HRS",
         "TTL_AMT",
-      ])
+      ]),
     );
     //Apply line by line adjustments.