build: setup primary entry-point package.json files to match release output

The primary entry-point `package.json` files are not generated by the
`ng_package` bazel rule. This is by intention because it does not
try to overwrite existing `package.json` files in the release output
(i.e. to preserve placeholders; dependencies etc.)

We need to update the `package.json` fields to match the new
release output that is generated by Bazel. Also adds a new
release output validation that ensures that those fields in the
`package.json` files are resolving to existing files.

Author: devversion

src/cdk-experimental/package.json

@@ -3,9 +3,13 @@
   "version": "0.0.0-PLACEHOLDER",
   "description": "Experimental components for Angular CDK",
   "main": "./bundles/cdk-experimental.umd.js",
-  "module": "./esm5/cdk-experimental.es5.js",
-  "es2015": "./esm2015/cdk-experimental.js",
-  "typings": "./cdk-experimental.d.ts",
+  "fesm5": "./fesm5/cdk-experimental.js",
+  "fesm2015": "./fesm2015/cdk-experimental.js",
+  "esm5": "./esm5/cdk-experimental_public_index.js",
+  "esm2015": "./esm2015/cdk-experimental_public_index.js",
+  "typings": "./cdk-experimental_public_index.d.ts",
+  "module": "./fesm5/cdk-experimental.js",
+  "es2015": "./fesm2015/cdk-experimental.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/angular/components.git"

src/cdk/package.json

@@ -3,9 +3,13 @@
   "version": "0.0.0-PLACEHOLDER",
   "description": "Angular Material Component Development Kit",
   "main": "./bundles/cdk.umd.js",
-  "module": "./esm5/cdk.es5.js",
-  "es2015": "./esm2015/cdk.js",
-  "typings": "./cdk.d.ts",
+  "fesm5": "./fesm5/cdk.js",
+  "fesm2015": "./fesm2015/cdk.js",
+  "esm5": "./esm5/cdk_public_index.js",
+  "esm2015": "./esm2015/cdk_public_index.js",
+  "typings": "./cdk_public_index.d.ts",
+  "module": "./fesm5/cdk.js",
+  "es2015": "./fesm2015/cdk.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/angular/components.git"

src/google-maps/package.json

@@ -3,9 +3,13 @@
   "version": "0.0.0-PLACEHOLDER",
   "description": "Angular Google Maps",
   "main": "./bundles/google-maps.umd.js",
-  "module": "./esm5/google-maps.es5.js",
-  "es2015": "./esm2015/google-maps.js",
-  "typings": "./google-maps.d.ts",
+  "fesm5": "./fesm5/google-maps.js",
+  "fesm2015": "./fesm2015/google-maps.js",
+  "esm5": "./esm5/google-maps_public_index.js",
+  "esm2015": "./esm2015/google-maps_public_index.js",
+  "typings": "./google-maps_public_index.d.ts",
+  "module": "./fesm5/google-maps.js",
+  "es2015": "./fesm2015/google-maps.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/angular/components.git"

src/material-examples/package.json

@@ -3,9 +3,13 @@
   "version": "0.0.0-PLACEHOLDER",
   "description": "Angular Material Examples",
   "main": "./bundles/material-examples.umd.js",
-  "module": "./esm5/material-examples.es5.js",
-  "es2015": "./esm2015/material-examples.js",
-  "typings": "./material-examples.d.ts",
+  "fesm5": "./fesm5/material-examples.js",
+  "fesm2015": "./fesm2015/material-examples.js",
+  "esm5": "./esm5/material-examples_public_index.js",
+  "esm2015": "./esm2015/material-examples_public_index.js",
+  "typings": "./material-examples_public_index.d.ts",
+  "module": "./fesm5/material-examples.js",
+  "es2015": "./fesm2015/material-examples.js",
   "private": true,
   "repository": {
     "type": "git",

src/material-experimental/package.json

@@ -3,9 +3,13 @@
   "version": "0.0.0-PLACEHOLDER",
   "description": "Experimental components for Angular Material",
   "main": "./bundles/material-experimental.umd.js",
-  "module": "./esm5/material-experimental.es5.js",
-  "es2015": "./esm2015/material-experimental.js",
-  "typings": "./material-experimental.d.ts",
+  "fesm5": "./fesm5/material-experimental.js",
+  "fesm2015": "./fesm2015/material-experimental.js",
+  "esm5": "./esm5/material-experimental_public_index.js",
+  "esm2015": "./esm2015/material-experimental_public_index.js",
+  "typings": "./material-experimental_public_index.d.ts",
+  "module": "./fesm5/material-experimental.js",
+  "es2015": "./fesm2015/material-experimental.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/angular/components.git"

src/material-moment-adapter/package.json

@@ -3,9 +3,13 @@
   "version": "0.0.0-PLACEHOLDER",
   "description": "Angular Material Moment Adapter",
   "main": "./bundles/material-moment-adapter.umd.js",
-  "module": "./esm5/material-moment-adapter.es5.js",
-  "es2015": "./esm2015/material-moment-adapter.js",
-  "typings": "./material-moment-adapter.d.ts",
+  "fesm5": "./fesm5/material-moment-adapter.js",
+  "fesm2015": "./fesm2015/material-moment-adapter.js",
+  "esm5": "./esm5/material-moment-adapter_public_index.js",
+  "esm2015": "./esm2015/material-moment-adapter_public_index.js",
+  "typings": "./material-moment-adapter_public_index.d.ts",
+  "module": "./fesm5/material-moment-adapter.js",
+  "es2015": "./fesm2015/material-moment-adapter.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/angular/components.git"

src/material/package.json

@@ -3,9 +3,13 @@
   "version": "0.0.0-PLACEHOLDER",
   "description": "Angular Material",
   "main": "./bundles/material.umd.js",
-  "module": "./esm5/material.es5.js",
-  "es2015": "./esm2015/material.js",
-  "typings": "./material.d.ts",
+  "fesm5": "./fesm5/material.js",
+  "fesm2015": "./fesm2015/material.js",
+  "esm5": "./esm5/index.js",
+  "esm2015": "./esm2015/index.js",
+  "typings": "./index.d.ts",
+  "module": "./fesm5/material.js",
+  "es2015": "./fesm2015/material.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/angular/components.git"

src/youtube-player/package.json

@@ -3,9 +3,13 @@
   "version": "0.0.0-PLACEHOLDER",
   "description": "Angular YouTube Player",
   "main": "./bundles/youtube-player.umd.js",
-  "module": "./esm5/youtube-player.es5.js",
-  "es2015": "./esm2015/youtube-player.js",
-  "typings": "./youtube-player.d.ts",
+  "fesm5": "./fesm5/youtube-player.js",
+  "fesm2015": "./fesm2015/youtube-player.js",
+  "esm5": "./esm5/youtube-player_public_index.js",
+  "esm2015": "./esm2015/youtube-player_public_index.js",
+  "typings": "./youtube-player_public_index.d.ts",
+  "module": "./fesm5/youtube-player.js",
+  "es2015": "./fesm2015/youtube-player.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/angular/components.git"

tools/release/release-output/check-package.ts

@@ -6,6 +6,7 @@ import {join} from 'path';
 import {
   checkCdkPackage,
   checkMaterialPackage,
+  checkPackageJsonFile,
   checkReleaseBundle,
   checkTypeDefinitionFile
 } from './output-validations';
@@ -16,6 +17,9 @@ const releaseBundlesGlob = '+(fesm5|fesm2015|esm5|esm2015|bundles)/*.js';
 /** Glob that matches all TypeScript definition files within a release package. */
 const releaseTypeDefinitionsGlob = '**/*.d.ts';
 
+/** Glob that matches all "package.json" files within a release package. */
+const packageJsonFilesGlob = '**/package.json';
+
 /**
  * Type that describes a map of package failures. The keys are failure messages and
  * their value is an array of specifically affected files.
@@ -41,18 +45,23 @@ export function checkReleasePackage(releasesPath: string, packageName: string):
 
   const bundlePaths = glob(releaseBundlesGlob, {cwd: packagePath, absolute: true});
   const typeDefinitions = glob(releaseTypeDefinitionsGlob, {cwd: packagePath, absolute: true});
+  const packageJsonFiles = glob(packageJsonFilesGlob, {cwd: packagePath, absolute: true});
 
   // We want to walk through each bundle within the current package and run
   // release validations that ensure that the bundles are not invalid.
   bundlePaths.forEach(bundlePath => {
-    checkReleaseBundle(bundlePath)
-      .forEach(message => addFailure(message, bundlePath));
+    checkReleaseBundle(bundlePath).forEach(message => addFailure(message, bundlePath));
   });
 
   // Run output validations for all TypeScript definition files within the release output.
   typeDefinitions.forEach(filePath => {
-    checkTypeDefinitionFile(filePath)
-      .forEach(message => addFailure(message, filePath));
+    checkTypeDefinitionFile(filePath).forEach(message => addFailure(message, filePath));
+  });
+
+  // Check each "package.json" file in the release output. We want to ensure
+  // that there are no invalid file references in the entry-point definitions.
+  packageJsonFiles.forEach(filePath => {
+    checkPackageJsonFile(filePath).forEach(message => addFailure(message, filePath));
   });
 
   // Special release validation checks for the "material" release package.

tools/release/release-output/output-validations.ts

@@ -1,6 +1,6 @@
 import {existsSync, readFileSync} from 'fs';
 import {sync as glob} from 'glob';
-import {dirname, isAbsolute, join, basename} from 'path';
+import {basename, dirname, isAbsolute, join} from 'path';
 import * as ts from 'typescript';
 
 /** RegExp that matches Angular component inline styles that contain a sourcemap reference. */
@@ -9,6 +9,13 @@ const inlineStylesSourcemapRegex = /styles: ?\[["'].*sourceMappingURL=.*["']/;
 /** RegExp that matches Angular component metadata properties that refer to external resources. */
 const externalReferencesRegex = /(templateUrl|styleUrls): *["'[]/;
 
+/**
+ * List of fields which are mandatory in entry-point "package.json" files and refer
+ * to files in the release output.
+ */
+const packageJsonPathFields =
+    ['main', 'module', 'typings', 'es2015', 'fesm5', 'fesm2015', 'esm5', 'esm2015'];
+
 /**
  * Checks the specified release bundle and ensures that it does not contain
  * any external resource URLs.
@@ -30,6 +37,32 @@ export function checkReleaseBundle(bundlePath: string): string[] {
   return failures;
 }
 
+/**
+ * Checks a "package.json" file by ensuring that common fields which are
+ * specified in the Angular package format are present. Those fields which
+ * resolve to paths are checked so that they do not refer to non-existent files.
+ */
+export function checkPackageJsonFile(filePath: string): string[] {
+  const fileContent = readFileSync(filePath, 'utf8');
+  const parsed = JSON.parse(fileContent);
+  const packageJsonDir = dirname(filePath);
+  const failures: string[] = [];
+
+  packageJsonPathFields.forEach(fieldName => {
+    if (!parsed[fieldName]) {
+      failures.push(`Missing field: ${fieldName}`);
+    }
+
+    const resolvedPath = join(packageJsonDir, parsed[fieldName]);
+
+    if (!existsSync(resolvedPath)) {
+      failures.push(`File referenced in "${fieldName}" field does not exist.`);
+    }
+  });
+
+  return failures;
+}
+
 /**
  * Checks the specified TypeScript definition file by ensuring it does not contain invalid
  * dynamic import statements. There can be invalid type imports paths because we compose the