build: produce metadata bundles for @angular modules (#14509)

Closes #14509

modules/@angular/common/index.ts

@@ -6,11 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-/**
- * @module
- * @description
- * Entry point for all public APIs of the common package.
- */
-export * from './src/common';
+// This file is not used to build this module. It is only used during editing
+// by the TypeScript language serivce and during build for verifcation. `ngc`
+// replaces this file with production index.ts when it rewrites private symbol
+// names.
 
-// This file only reexports content of the `src` folder. Keep it that way.
+export * from './public_api';

modules/@angular/common/public_api.ts

@@ -0,0 +1,16 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+/**
+ * @module
+ * @description
+ * Entry point for all public APIs of the common package.
+ */
+export * from './src/common';
+
+// This file only reexports content of the `src` folder. Keep it that way.

modules/@angular/common/src/common.ts

@@ -13,7 +13,7 @@
  */
 export * from './location/index';
 export {NgLocaleLocalization, NgLocalization} from './localization';
-export {CommonModule} from './common_module';
+export {CommonModule, DeprecatedCommonModule} from './common_module';
 export {NgClass, NgFor, NgForOf, NgIf, NgPlural, NgPluralCase, NgStyle, NgSwitch, NgSwitchCase, NgSwitchDefault, NgTemplateOutlet, NgComponentOutlet} from './directives/index';
 export {AsyncPipe, DatePipe, I18nPluralPipe, I18nSelectPipe, JsonPipe, LowerCasePipe, CurrencyPipe, DecimalPipe, PercentPipe, SlicePipe, UpperCasePipe, TitleCasePipe} from './pipes/index';
 export {VERSION} from './version';

modules/@angular/common/src/common_module.ts

@@ -32,7 +32,9 @@ export class CommonModule {
 
 /**
  * A module to contain deprecated directives.
+ *
+ * @deprecated
  */
 @NgModule({declarations: [COMMON_DEPRECATED_DIRECTIVES], exports: [COMMON_DEPRECATED_DIRECTIVES]})
-export class CommonDeprecatedModule {
+export class DeprecatedCommonModule {
 }

modules/@angular/common/tsconfig-build.json

@@ -20,11 +20,13 @@
     "types": []
   },
   "files": [
-    "index.ts",
+    "public_api.ts",
     "../../../node_modules/zone.js/dist/zone.js.d.ts"
   ],
   "angularCompilerOptions": {
     "annotateForClosureCompiler": true,
-    "strictMetadataEmit": true
+    "strictMetadataEmit": true,
+    "bundleIndex": "index",
+    "importAs": "@angular/common"
   }
 }