refactor(@angular-devkit/build-angular): remove deprecated es5BrowserSupport build option

BREAKING CHANGE
Deprecated browser builder option `es5BrowserSupport` has been removed. The inclusion for ES5 polyfills will be determined from the browsers listed in the browserslist configuration.

Author: alan-agius4

packages/angular/cli/lib/config/schema.json

@@ -950,11 +950,6 @@
               },
               "default": []
             },
-            "es5BrowserSupport": {
-              "description": "Enables conditionally loaded ES2015 polyfills.",
-              "type": "boolean",
-              "default": false
-            },
             "rebaseRootRelativeCssUrls": {
               "description": "Change root relative URLs in stylesheets to include base HREF and deploy URL. Use only for compatibility and transition. The behavior of this option is non-standard and will be removed in the next major release.",
               "type": "boolean",

packages/angular_devkit/build_angular/src/angular-cli-files/models/build-options.ts

@@ -68,8 +68,6 @@ export interface BuildOptions {
   statsJson: boolean;
   forkTypeChecker: boolean;
   profile?: boolean;
-  /** @deprecated since version 8 **/
-  es5BrowserSupport?: boolean;
 
   main: string;
   polyfills?: string;

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

@@ -130,10 +130,7 @@ export function getCommonConfig(wco: WebpackConfigOptions): Configuration {
         tsConfig.options.target || ScriptTarget.ES5,
       );
 
-      if (
-        buildOptions.es5BrowserSupport ||
-        (buildOptions.es5BrowserSupport === undefined && buildBrowserFeatures.isEs5SupportNeeded())
-      ) {
+      if (buildBrowserFeatures.isEs5SupportNeeded()) {
         const polyfillsChunkName = 'polyfills-es5';
         entryPoints[polyfillsChunkName] = [path.join(__dirname, '..', 'es5-polyfills.js')];
         if (differentialLoadingMode) {

packages/angular_devkit/build_angular/src/browser/schema.json

@@ -350,11 +350,6 @@
       "default": false,
       "x-deprecated": "Use \"NG_BUILD_PROFILING\" environment variable instead."
     },
-    "es5BrowserSupport": {
-      "description": "Enables conditionally loaded ES2015 polyfills.",
-      "type": "boolean",
-      "x-deprecated": "This will be determined from the list of supported browsers specified in the 'browserslist' file."
-    },
     "rebaseRootRelativeCssUrls": {
       "description": "Change root relative URLs in stylesheets to include base HREF and deploy URL. Use only for compatibility and transition. The behavior of this option is non-standard and will be removed in the next major release.",
       "type": "boolean",

packages/angular_devkit/build_angular/src/utils/webpack-browser-config.ts

@@ -82,7 +82,6 @@ export async function generateWebpackConfig(
       // Under downlevel differential loading we copy the assets outside of webpack.
       assets: [],
       esVersionInFileName: true,
-      es5BrowserSupport: undefined,
     };
   }
 

packages/schematics/angular/utility/workspace-models.ts

@@ -62,7 +62,6 @@ export interface BrowserBuilderOptions extends BrowserBuilderBaseOptions {
         maximumWarning?: string;
         maximumError?: string;
     }[];
-    es5BrowserSupport?: boolean;
     webWorkerTsConfig?: string;
 }
 

tests/legacy-cli/e2e/tests/misc/support-ie.ts renamed to tests/legacy-cli/e2e/tests/misc/es5-polyfills.ts

@@ -9,11 +9,6 @@ export default async function () {
     compilerOptions['target'] = 'es5';
   });
 
-  await updateJsonFile('angular.json', workspaceJson => {
-      const appArchitect = workspaceJson.projects['test-project'].architect;
-      appArchitect.build.options.es5BrowserSupport = false;
-  });
-
   await writeFile('.browserslistrc', 'last 2 Chrome versions');
   await ng('build');
   await expectFileNotToExist('dist/test-project/polyfills-es5.js');
@@ -25,21 +20,6 @@ export default async function () {
     <script src="main.js" defer></script>
   `);
 
-  await ng('build', `--es5BrowserSupport`);
-  await expectFileToMatch('dist/test-project/polyfills-es5.js', 'core-js');
-  await expectFileToMatch('dist/test-project/index.html', oneLineTrim`
-    <script src="runtime.js" defer></script>
-    <script src="polyfills-es5.js" nomodule defer></script>
-    <script src="polyfills.js" defer></script>
-    <script src="styles.js" defer></script>
-    <script src="vendor.js" defer></script>
-    <script src="main.js" defer></script>
-  `);
-
-  await updateJsonFile('angular.json', workspaceJson => {
-    const appArchitect = workspaceJson.projects['test-project'].architect;
-    appArchitect.build.options.es5BrowserSupport = undefined;
-  });
   await writeFile('.browserslistrc', 'IE 10');
   await ng('build');
   await expectFileToMatch('dist/test-project/polyfills-es5.js', 'core-js');