fix(@angular-devkit/build-angular): never split polyfill chunks

Fix #14280

Author: filipesilva

packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/browser.ts

@@ -11,7 +11,7 @@ import * as webpack from 'webpack';
 import { IndexHtmlWebpackPlugin } from '../../plugins/index-html-webpack-plugin';
 import { generateEntryPoints } from '../../utilities/package-chunk-sort';
 import { WebpackConfigOptions } from '../build-options';
-import { getSourceMapDevTool, normalizeExtraEntryPoints } from './utils';
+import { getSourceMapDevTool, isPolyfillsEntry, normalizeExtraEntryPoints } from './utils';
 
 const SubresourceIntegrityPlugin = require('webpack-subresource-integrity');
 
@@ -114,7 +114,7 @@ export function getBrowserConfig(wco: WebpackConfigOptions): webpack.Configurati
               const moduleName = module.nameForCondition ? module.nameForCondition() : '';
 
               return /[\\/]node_modules[\\/]/.test(moduleName)
-                && !chunks.some(({ name }) => name === 'polyfills' || name === 'polyfills-es5'
+                && !chunks.some(({ name }) => isPolyfillsEntry(name)
                   || globalStylesBundleNames.includes(name));
             },
           },

packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/test.ts

@@ -10,7 +10,7 @@ import * as glob from 'glob';
 import * as path from 'path';
 import * as webpack from 'webpack';
 import { WebpackConfigOptions, WebpackTestOptions } from '../build-options';
-import { getSourceMapDevTool } from './utils';
+import { getSourceMapDevTool, isPolyfillsEntry } from './utils';
 
 
 /**
@@ -85,7 +85,7 @@ export function getTestConfig(
     plugins: extraPlugins,
     optimization: {
       splitChunks: {
-        chunks: ((chunk: { name: string }) => chunk.name !== 'polyfills'),
+        chunks: ((chunk: { name: string }) => !isPolyfillsEntry(chunk.name)),
         cacheGroups: {
           vendors: false,
           vendor: {
@@ -95,7 +95,7 @@ export function getTestConfig(
               const moduleName = module.nameForCondition ? module.nameForCondition() : '';
 
               return /[\\/]node_modules[\\/]/.test(moduleName)
-                && !chunks.some(({ name }) => name === 'polyfills');
+                && !chunks.some(({ name }) => isPolyfillsEntry(name));
             },
           },
         },

packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/utils.ts

@@ -101,3 +101,7 @@ export function getEsVersionForFileName(
   return scriptTargetOverride && esVersionInFileName ?
     '-' + ScriptTarget[scriptTargetOverride].toLowerCase() : '';
 }
+
+export function isPolyfillsEntry(name: string) {
+  return name === 'polyfills' || name === 'polyfills-es5';
+}