build(bazel): Turning on strictPropertyInitialization for Angular. (#24572)

All errors for existing fields have been detected and suppressed with a
`!` assertion.

Issue/24571 is tracking proper clean up of those instances.

One-line change required in ivy/compilation.ts, because it appears that
the new syntax causes tsickle emitted node to no longer track their
original sourceFiles.

PR Close #24572

packages/service-worker/cli/tsconfig.json

@@ -6,6 +6,7 @@
     "module": "es2015",
     "moduleResolution": "node",
     "strictNullChecks": true,
+    "strictPropertyInitialization": true,
     "outDir": "../../../dist/all/@angular/service-worker/cli-custom",
     "noImplicitAny": true,
     "noFallthroughCasesInSwitch": true,

packages/service-worker/src/push.ts

@@ -23,7 +23,8 @@ export class SwPush {
   readonly messages: Observable<object>;
   readonly subscription: Observable<PushSubscription|null>;
 
-  private pushManager: Observable<PushManager>;
+  // TODO(issue/24571): remove '!'.
+  private pushManager !: Observable<PushManager>;
   private subscriptionChanges: Subject<PushSubscription|null> =
       new Subject<PushSubscription|null>();
 

packages/service-worker/worker/testing/mock.ts

@@ -95,7 +95,8 @@ export class MockServerState {
   private requests: Request[] = [];
   private gate: Promise<void> = Promise.resolve();
   private resolve: Function|null = null;
-  private resolveNextRequest: Function;
+  // TODO(issue/24571): remove '!'.
+  private resolveNextRequest !: Function;
   online = true;
   nextRequest: Promise<Request>;
 

packages/service-worker/worker/testing/scope.ts

@@ -79,7 +79,8 @@ export class SwTestHarness implements ServiceWorkerGlobalScope, Adapter, Context
   private skippedWaiting = true;
 
   private selfMessageQueue: any[] = [];
-  unregistered: boolean;
+  // TODO(issue/24571): remove '!'.
+  unregistered !: boolean;
   readonly notifications: {title: string, options: Object}[] = [];
   readonly registration: ServiceWorkerRegistration = {
     active: {

packages/service-worker/worker/tsconfig.json

@@ -6,6 +6,7 @@
     "module": "es2015",
     "moduleResolution": "node",
     "strictNullChecks": true,
+    "strictPropertyInitialization": true,
     "outDir": "../../../dist/all/@angular/service-worker/worker-es2017",
     "noImplicitAny": true,
     "noFallthroughCasesInSwitch": true,