hunk.code_window:       ...(options.commonChunk !== undefined ? { commonChunk: options.commonChunk } : {}),
         ...(options.baseHref !== undefined ? { baseHref: options.baseHref } : {}),
         ...(options.progress !== undefined ? { progress: options.progress } : {}),
         ...(options.poll !== undefined ? { poll: options.poll } : {}),
       };
       const browserTargetSpec = { project, target, configuration, overrides };
       const builderConfig = architect.getBuilderConfiguration<BrowserBuilderSchema>(
  
hunk.labels: keep keep keep add keep keep keep keep
hunk.after_edit:       ...(options.verbose !== undefined ? { verbose: options.verbose } : {}),
  
hunk.file_path: packages/angular_devkit/build_angular/src/dev-server/index.ts
hunk.type: add
file: /**
   * @license
   * Copyright Google Inc. All Rights Reserved.
   *
   * Use of this source code is governed by an MIT-style license that can be
   * found in the LICENSE file at https://angular.io/license
   */
  import { NormalizedRoot, Path, PathFragment, join, split } from '../path';
  import { ResolverHost } from './resolver';
  
  
  /**
   * A Virtual Host that allow to alias some paths to other paths.
   *
   * This does not verify, when setting an alias, that the target or source exist. Neither does it
   * check whether it's a file or a directory. Please not that directories are also renamed/replaced.
   *
   * No recursion is done on the resolution, which means the following is perfectly valid then:
   *
   * ```
   *     host.aliases.set(normalize('/file/a'), normalize('/file/b'));
   *     host.aliases.set(normalize('/file/b'), normalize('/file/a'));
   * ```
   *
   * This will result in a proper swap of two files for each others.
   *
   * @example
   *   const host = new SimpleMemoryHost();
   *   host.write(normalize('/some/file'), content).subscribe();
   *
   *   const aHost = new AliasHost(host);
   *   aHost.read(normalize('/some/file'))
   *     .subscribe(x => expect(x).toBe(content));
   *   aHost.aliases.set(normalize('/some/file'), normalize('/other/path');
   *
   *   // This file will not exist because /other/path does not exist.
   *   aHost.read(normalize('/some/file'))
   *     .subscribe(undefined, err => expect(err.message).toMatch(/does not exist/));
   *
   * @example
   *   const host = new SimpleMemoryHost();
   *   host.write(normalize('/some/folder/file'), content).subscribe();
   *
   *   const aHost = new AliasHost(host);
   *   aHost.read(normalize('/some/folder/file'))
   *     .subscribe(x => expect(x).toBe(content));
   *   aHost.aliases.set(normalize('/some'), normalize('/other');
   *
   *   // This file will not exist because /other/path does not exist.
   *   aHost.read(normalize('/some/folder/file'))
   *     .subscribe(undefined, err => expect(err.message).toMatch(/does not exist/));
   *
   *   // Create the file with new content and verify that this has the new content.
   *   aHost.write(normalize('/other/folder/file'), content2).subscribe();
   *   aHost.read(normalize('/some/folder/file'))
   *     .subscribe(x => expect(x).toBe(content2));
   */
  export class AliasHost<StatsT extends object = {}> extends ResolverHost<StatsT> {
    protected _aliases = new Map<Path, Path>();
  
    protected _resolve(path: Path) {
      let maybeAlias = this._aliases.get(path);
      const sp = split(path);
      const remaining: PathFragment[] = [];
  
      // Also resolve all parents of the requested files, only picking the first one that matches.
      // This can have surprising behaviour when aliases are inside another alias. It will always
      // use the closest one to the file.
      while (!maybeAlias && sp.length > 0) {
        const p = join(NormalizedRoot, ...sp);
        maybeAlias = this._aliases.get(p);
  
        if (maybeAlias) {
          maybeAlias = join(maybeAlias, ...remaining);
        }
        // Allow non-null-operator because we know sp.length > 0 (condition on while).
        remaining.unshift(sp.pop() !);  // tslint:disable-line:no-non-null-assertion
      }
  
      return maybeAlias || path;
    }
  
    get aliases(): Map<Path, Path> { return this._aliases; }
  }
  