refactor: clean up remove unused code

Author: alan-agius4

packages/angular/cli/models/command.ts

@@ -16,7 +16,6 @@ import {
   CommandDescriptionMap,
   CommandScope,
   Option,
-  SubCommandDescription,
 } from './interface';
 
 export interface BaseCommandOptions {

packages/angular_devkit/build_angular/src/karma/tests/options/code-coverage_spec.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import { first, last, tap } from 'rxjs/operators';
+import { last, tap } from 'rxjs/operators';
 import { promisify } from 'util';
 import { execute } from '../../index';
 import { BASE_OPTIONS, KARMA_BUILDER_INFO, describeBuilder } from '../setup';

packages/ngtools/webpack/src/resource_loader.ts

@@ -202,13 +202,11 @@ export class WebpackResourceLoader {
     );
 
     let finalContent: string | undefined;
-    let finalMap: string | undefined;
     childCompiler.hooks.compilation.tap('angular-compiler', (childCompilation) => {
       childCompilation.hooks.processAssets.tap(
         { name: 'angular-compiler', stage: webpack.Compilation.PROCESS_ASSETS_STAGE_REPORT },
         () => {
           finalContent = childCompilation.assets[outputFilePath]?.source().toString();
-          finalMap = childCompilation.assets[outputFilePath + '.map']?.source().toString();
 
           delete childCompilation.assets[outputFilePath];
           delete childCompilation.assets[outputFilePath + '.map'];