style: remove unused locals and imports

Closes #12435

Author: alan-agius4

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

@@ -15,8 +15,6 @@ import { LicenseWebpackPlugin } from 'license-webpack-plugin';
 import { generateEntryPoints, packageChunkSort } from '../../utilities/package-chunk-sort';
 import { BaseHrefWebpackPlugin } from '../../lib/base-href-webpack';
 import { IndexHtmlWebpackPlugin } from '../../plugins/index-html-webpack-plugin';
-import { ExtraEntryPoint } from '../../../browser/schema';
-import { BrowserBuilderSchema } from '../../../browser/schema';
 import { WebpackConfigOptions } from '../build-options';
 import { normalizeExtraEntryPoints } from './utils';
 

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

@@ -19,7 +19,7 @@ import { BundleBudgetPlugin } from '../../plugins/bundle-budget';
 import { CleanCssWebpackPlugin } from '../../plugins/cleancss-webpack-plugin';
 import { ScriptsWebpackPlugin } from '../../plugins/scripts-webpack-plugin';
 import { findUp } from '../../utilities/find-up';
-import { AssetPatternObject, ExtraEntryPoint } from '../../../browser/schema';
+import { AssetPatternObject } from '../../../browser/schema';
 import { normalizeExtraEntryPoints } from './utils';
 
 const ProgressPlugin = require('webpack/lib/ProgressPlugin');
@@ -214,9 +214,6 @@ export function getCommonConfig(wco: WebpackConfigOptions) {
     alias = rxPaths(nodeModules);
   } catch { }
 
-  const isIvyEnabled = wco.tsConfig.raw.angularCompilerOptions
-                    && wco.tsConfig.raw.angularCompilerOptions.enableIvy;
-
   const terserOptions = {
     ecma: wco.supportES2015 ? 6 : 5,
     warnings: !!buildOptions.verbose,