build: TypeScript 3.5 upgrade (#31615)

https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-35

PR Close #31615

packages/platform-webworker/src/web_workers/shared/post_message_bus.ts

@@ -14,7 +14,7 @@ import {MessageBus, MessageBusSink, MessageBusSource} from './message_bus';
 
 // TODO(jteplitz602): Replace this with the definition in lib.webworker.d.ts(#3492)
 export interface PostMessageTarget {
-  postMessage: (message: any, transfer?: [ArrayBuffer]) => void;
+  postMessage: (message: any, transfer?: [Transferable]) => void;
 }
 
 export class PostMessageBusSink implements MessageBusSink {

packages/platform-webworker/src/worker_app.ts

@@ -36,7 +36,7 @@ export function errorHandler(): ErrorHandler {
 
 // TODO(jteplitz602): remove this and compile with lib.webworker.d.ts (#3492)
 const _postMessage = {
-  postMessage: (message: any, transferrables?: [ArrayBuffer]) => {
+  postMessage: (message: any, transferrables: [Transferable]) => {
     (<any>postMessage)(message, transferrables);
   }
 };

packages/platform-webworker/src/worker_render.ts

@@ -171,7 +171,10 @@ function createNgZone(): NgZone {
  */
 function spawnWebWorker(uri: string, instance: WebWorkerInstance): void {
   const webWorker: Worker = new Worker(uri);
-  const sink = new PostMessageBusSink(webWorker);
+  // webWorker is casted to any because the lib.d.ts signature changed in TS3.5 to require the
+  // transfer argument in postMessage method.
+  // this seems wrong but since all of this code is deprecated it shouldn't matter that much.
+  const sink = new PostMessageBusSink(webWorker as any);
   const source = new PostMessageBusSource(webWorker);
   const bus = new PostMessageBus(sink, source);
 

packages/platform-webworker/test/web_workers/shared/message_bus_util.ts

@@ -32,5 +32,5 @@ class MockPostMessage {
     }
   }
 
-  postMessage(data: any, transfer?: [ArrayBuffer]): void { this._listener(<any>{data: data}); }
+  postMessage(data: any, transfer?: [Transferable]): void { this._listener(<any>{data: data}); }
 }