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/common/http/src/headers.ts

@@ -20,7 +20,8 @@ export class HttpHeaders {
   /**
    * Internal map of lowercase header names to values.
    */
-  private headers: Map<string, string[]>;
+  // TODO(issue/24571): remove '!'.
+  private headers !: Map<string, string[]>;
 
 
   /**
@@ -32,7 +33,8 @@ export class HttpHeaders {
   /**
    * Complete the lazy initialization of this object (needed before reading).
    */
-  private lazyInit: HttpHeaders|Function|null;
+  // TODO(issue/24571): remove '!'.
+  private lazyInit !: HttpHeaders | Function | null;
 
   /**
    * Queued updates to be materialized the next initialization.

packages/common/http/src/request.ts

@@ -88,7 +88,8 @@ export class HttpRequest<T> {
   /**
    * Outgoing headers for this request.
    */
-  readonly headers: HttpHeaders;
+  // TODO(issue/24571): remove '!'.
+  readonly headers !: HttpHeaders;
 
   /**
    * Whether this request should be made in a way that exposes progress events.
@@ -119,7 +120,8 @@ export class HttpRequest<T> {
   /**
    * Outgoing URL parameters.
    */
-  readonly params: HttpParams;
+  // TODO(issue/24571): remove '!'.
+  readonly params !: HttpParams;
 
   /**
    * The outgoing URL with all URL parameters set.

packages/common/http/src/response.ts

@@ -171,7 +171,8 @@ export abstract class HttpResponseBase {
   /**
    * Type of the response, narrowed to either the full response or the header.
    */
-  readonly type: HttpEventType.Response|HttpEventType.ResponseHeader;
+  // TODO(issue/24571): remove '!'.
+  readonly type !: HttpEventType.Response | HttpEventType.ResponseHeader;
 
   /**
    * Super-constructor for all responses.

packages/common/http/test/jsonp_mock.ts

@@ -22,7 +22,8 @@ export class MockScriptElement {
 }
 
 export class MockDocument {
-  mock: MockScriptElement|null;
+  // TODO(issue/24571): remove '!'.
+  mock !: MockScriptElement | null;
   readonly body: any = this;
 
   createElement(tag: 'script'): HTMLScriptElement {

packages/common/http/test/xhr_mock.ts

@@ -10,7 +10,8 @@ import {HttpHeaders} from '../src/headers';
 import {XhrFactory} from '../src/xhr';
 
 export class MockXhrFactory implements XhrFactory {
-  mock: MockXMLHttpRequest;
+  // TODO(issue/24571): remove '!'.
+  mock !: MockXMLHttpRequest;
 
   build(): XMLHttpRequest { return (this.mock = new MockXMLHttpRequest()) as any; }
 }
@@ -30,8 +31,10 @@ export class MockXMLHttpRequestUpload {
 export class MockXMLHttpRequest {
   // Set by method calls.
   body: any;
-  method: string;
-  url: string;
+  // TODO(issue/24571): remove '!'.
+  method !: string;
+  // TODO(issue/24571): remove '!'.
+  url !: string;
   mockHeaders: {[key: string]: string} = {};
   mockAborted: boolean = false;