feat(compiler): Added "strictMetadataEmit" option to ngc (#10951)

ngc can now validate metadata before emitting to verify it doesn't
contain an error symbol that will result in a runtime error if
it is used by the StaticReflector.

To enable this add the section,

  "angularCompilerOptions": {
    "strictMetadataEmit": true
  }

to the top level of the tsconfig.json file passed to ngc.

Enabled metadata validation for packages that are intended to be
used statically.

modules/@angular/platform-browser/index.ts

@@ -27,5 +27,5 @@ export {WORKER_UI_LOCATION_PROVIDERS} from './src/web_workers/ui/location_provid
 
 export {NgProbeToken} from './src/dom/debug/ng_probe';
 export * from './src/worker_render';
-export * from './src/worker_app';
+export {platformWorkerApp, WorkerAppModule} from './src/worker_app';
 export * from './private_export';

modules/@angular/platform-browser/src/worker_app.ts

@@ -21,7 +21,12 @@ import {ServiceMessageBrokerFactory, ServiceMessageBrokerFactory_} from './web_w
 import {WebWorkerRootRenderer} from './web_workers/worker/renderer';
 import {WorkerDomAdapter} from './web_workers/worker/worker_adapter';
 
-class PrintLogger {
+/**
+ * Logger for web workers.
+ *
+ * @experimental
+ */
+export class PrintLogger {
   log = print;
   logError = print;
   logGroup = print;
@@ -33,7 +38,12 @@ class PrintLogger {
  */
 export const platformWorkerApp = createPlatformFactory(platformCore, 'workerApp');
 
-function _exceptionHandler(): ExceptionHandler {
+/**
+ * Exception handler factory function.
+ *
+ * @experimental
+ */
+export function exceptionHandler(): ExceptionHandler {
   return new ExceptionHandler(new PrintLogger());
 }
 
@@ -44,7 +54,12 @@ let _postMessage = {
   }
 };
 
-function createMessageBus(zone: NgZone): MessageBus {
+/**
+ * MessageBus factory function.
+ *
+ * @experimental
+ */
+export function createMessageBus(zone: NgZone): MessageBus {
   let sink = new PostMessageBusSink(_postMessage);
   let source = new PostMessageBusSource();
   let bus = new PostMessageBus(sink, source);
@@ -52,7 +67,12 @@ function createMessageBus(zone: NgZone): MessageBus {
   return bus;
 }
 
-function setupWebWorker(): void {
+/**
+ * Application initializer for web workers.
+ *
+ * @experimental
+ */
+export function setupWebWorker(): void {
   WorkerDomAdapter.makeCurrent();
 }
 
@@ -68,7 +88,7 @@ function setupWebWorker(): void {
     {provide: ServiceMessageBrokerFactory, useClass: ServiceMessageBrokerFactory_},
     WebWorkerRootRenderer, {provide: RootRenderer, useExisting: WebWorkerRootRenderer},
     {provide: ON_WEB_WORKER, useValue: true}, RenderStore,
-    {provide: ExceptionHandler, useFactory: _exceptionHandler, deps: []},
+    {provide: ExceptionHandler, useFactory: exceptionHandler, deps: []},
     {provide: MessageBus, useFactory: createMessageBus, deps: [NgZone]},
     {provide: APP_INITIALIZER, useValue: setupWebWorker, multi: true}
   ],

modules/@angular/platform-browser/testing/browser.ts

@@ -13,17 +13,13 @@ import {BrowserDomAdapter} from '../src/browser/browser_adapter';
 import {AnimationDriver} from '../src/dom/animation_driver';
 import {ELEMENT_PROBE_PROVIDERS} from '../src/dom/debug/ng_probe';
 
-import {BrowserDetection} from './browser_util';
+import {BrowserDetection, createNgZone} from './browser_util';
 
 function initBrowserTests() {
   BrowserDomAdapter.makeCurrent();
   BrowserDetection.setup();
 }
 
-function createNgZone(): NgZone {
-  return new NgZone({enableLongStackTrace: true});
-}
-
 const _TEST_BROWSER_PLATFORM_PROVIDERS: Provider[] =
     [{provide: PLATFORM_INITIALIZER, useValue: initBrowserTests, multi: true}];
 

modules/@angular/platform-browser/testing/browser_util.ts

@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {NgZone} from '@angular/core';
 import {getDOM} from '../src/dom/dom_adapter';
 import {ListWrapper} from '../src/facade/collection';
 import {RegExp, StringWrapper, global, isPresent, isString} from '../src/facade/lang';
@@ -129,3 +130,7 @@ export function stringifyElement(el: any /** TODO #9100 */): string {
 }
 
 export var browserDetection: BrowserDetection = new BrowserDetection(null);
+
+export function createNgZone(): NgZone {
+  return new NgZone({enableLongStackTrace: true});
+}

modules/@angular/platform-browser/tsconfig-es2015.json

@@ -29,5 +29,8 @@
     "../../../node_modules/@types/jasmine/index.d.ts",
     "../../../node_modules/@types/protractor/index.d.ts",
     "../../../node_modules/zone.js/dist/zone.js.d.ts"
-  ]
+  ],
+  "angularCompilerOptions": {
+    "strictMetadataEmit": true
+  }
 }

modules/@angular/platform-browser/tsconfig-es5.json

@@ -30,5 +30,8 @@
     "../../../node_modules/@types/jasmine/index.d.ts",
     "../../../node_modules/@types/protractor/index.d.ts",
     "../../../node_modules/zone.js/dist/zone.js.d.ts"
-  ]
+  ],
+  "angularCompilerOptions": {
+    "strictMetadataEmit": true
+  }
 }