hunk.code_window:       "default": false,
         "alias": "o"
       },
       "liveReload": {
         "type": "boolean",
         "description": "Whether to reload the page on change, using live-reload.",
  
hunk.labels: keep keep add keep keep keep
hunk.after_edit:     "verbose": {
         "type": "boolean",
         "description": "Adds more details to output logging.",
         "default": false
       },
  
hunk.file_path: packages/angular_devkit/build_angular/src/dev-server/schema.json
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 { strings } from '@angular-devkit/core';
  import {
    Rule,
    SchematicsException,
    Tree,
    apply,
    branchAndMerge,
    chain,
    filter,
    mergeWith,
    move,
    noop,
    template,
    url,
  } from '@angular-devkit/schematics';
  import * as ts from 'typescript';
  import { addDeclarationToModule, addExportToModule } from '../utility/ast-utils';
  import { InsertChange } from '../utility/change';
  import { buildRelativePath, findModuleFromOptions } from '../utility/find-module';
  import { applyLintFix } from '../utility/lint-fix';
  import { parseName } from '../utility/parse-name';
  import { buildDefaultPath, getProject } from '../utility/project';
  import { Schema as PipeOptions } from './schema';
  
  
  function addDeclarationToNgModule(options: PipeOptions): Rule {
    return (host: Tree) => {
      if (options.skipImport || !options.module) {
        return host;
      }
  
      const modulePath = options.module;
      const text = host.read(modulePath);
      if (text === null) {
        throw new SchematicsException(`File ${modulePath} does not exist.`);
      }
      const sourceText = text.toString('utf-8');
      const source = ts.createSourceFile(modulePath, sourceText, ts.ScriptTarget.Latest, true);
  
      const pipePath = `/${options.path}/`
                       + (options.flat ? '' : strings.dasherize(options.name) + '/')
                       + strings.dasherize(options.name)
                       + '.pipe';
      const relativePath = buildRelativePath(modulePath, pipePath);
      const changes = addDeclarationToModule(source, modulePath,
                                             strings.classify(`${options.name}Pipe`),
                                             relativePath);
      const recorder = host.beginUpdate(modulePath);
      for (const change of changes) {
        if (change instanceof InsertChange) {
          recorder.insertLeft(change.pos, change.toAdd);
        }
      }
      host.commitUpdate(recorder);
  
      if (options.export) {
        const text = host.read(modulePath);
        if (text === null) {
          throw new SchematicsException(`File ${modulePath} does not exist.`);
        }
        const sourceText = text.toString('utf-8');
        const source = ts.createSourceFile(modulePath, sourceText, ts.ScriptTarget.Latest, true);
  
        const exportRecorder = host.beginUpdate(modulePath);
        const exportChanges = addExportToModule(source, modulePath,
                                                strings.classify(`${options.name}Pipe`),
                                                relativePath);
  
        for (const change of exportChanges) {
          if (change instanceof InsertChange) {
            exportRecorder.insertLeft(change.pos, change.toAdd);
          }
        }
        host.commitUpdate(exportRecorder);
      }
  
      return host;
    };
  }
  
  export default function (options: PipeOptions): Rule {
    return (host: Tree) => {
      if (!options.project) {
        throw new SchematicsException('Option (project) is required.');
      }
      const project = getProject(host, options.project);
  
      if (options.path === undefined) {
        options.path = buildDefaultPath(project);
      }
  
      const parsedPath = parseName(options.path, options.name);
      options.name = parsedPath.name;
      options.path = parsedPath.path;
  
      options.module = findModuleFromOptions(host, options);
  
      const templateSource = apply(url('./files'), [
        options.spec ? noop() : filter(path => !path.endsWith('.spec.ts')),
        template({
          ...strings,
          'if-flat': (s: string) => options.flat ? '' : s,
          ...options,
        }),
        move(parsedPath.path),
      ]);
  
      return branchAndMerge(
        chain([
          addDeclarationToNgModule(options),
          mergeWith(templateSource),
          options.lintFix ? applyLintFix(options.path) : noop(),
        ]),
      );
    };
  }
  