hunk.code_window:       });
       }
       return new Observable<BuilderOutput>(observer => {
         const subscriptions: Subscription[] = [];
         const inputSubscription = context.inboundBus.subscribe(
           i => {
  
hunk.labels: keep keep keep replace keep keep keep keep
hunk.after_edit:     return new Observable<OutT>(observer => {
  
hunk.file_path: packages/angular_devkit/architect/src/create-builder.ts
hunk.type: replace
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
   */
  // tslint:disable:no-implicit-dependencies
  import { JsonObject, logging } from '@angular-devkit/core';
  import * as fs from 'fs';
  import * as path from 'path';
  import * as semver from 'semver';
  import { packages } from '../lib/packages';
  
  const changelogTemplate = require('./templates/changelog').default;
  
  const conventionalCommitsParser = require('conventional-commits-parser');
  const gitRawCommits = require('git-raw-commits');
  const ghGot = require('gh-got');
  const through = require('through2');
  
  
  export interface ChangelogOptions {
    from: string;
    to?: string;
    githubTokenFile?: string;
    githubToken?: string;
  
    stdout?: boolean;
  }
  
  
  export default function(args: ChangelogOptions, logger: logging.Logger) {
    const commits: JsonObject[] = [];
    let toSha: string | null = null;
  
    const githubToken = (
      args.githubToken
      || (args.githubTokenFile && fs.readFileSync(args.githubTokenFile, 'utf-8'))
      || ''
    ).trim();
  
    return new Promise((resolve) => {
      (gitRawCommits({
        from: args.from,
        to: args.to || 'HEAD',
        format: '%B%n-hash-%n%H%n-gitTags-%n%D%n-committerDate-%n%ci%n-authorName-%n%aN%n',
      }) as NodeJS.ReadStream)
        .on('error', err => {
          logger.fatal('An error happened: ' + err.message);
          process.exit(1);
        })
        .pipe(through((chunk: Buffer, enc: string, callback: Function) => {
          // Replace github URLs with `@XYZ#123`
          const commit = chunk.toString('utf-8')
            .replace(/https?:\/\/github.com\/(.*?)\/issues\/(\d+)/g, '@$1#$2');
  
          callback(undefined, Buffer.from(commit));
        }))
        .pipe(conventionalCommitsParser({
          headerPattern: /^(\w*)(?:\(([^)]*)\))?: (.*)$/,
          headerCorrespondence: ['type', 'scope', 'subject'],
          noteKeywords: ['BREAKING CHANGE'],
          revertPattern: /^revert:\s([\s\S]*?)\s*This reverts commit (\w*)\./,
          revertCorrespondence: [`header`, `hash`],
        }))
        .pipe(through.obj((chunk: JsonObject, _: string, cb: Function) => {
          try {
            const maybeTag = chunk.gitTags && (chunk.gitTags as string).match(/tag: (.*)/);
            const tags = maybeTag && maybeTag[1].split(/,/g);
            chunk['tags'] = tags;
  
            if (tags && tags.find(x => x == args.to)) {
              toSha = chunk.hash as string;
            }
  
            commits.push(chunk);
            cb();
          } catch (err) {
            cb(err);
          }
        }))
        .on('finish', resolve);
    })
      .then(() => {
        const markdown: string = changelogTemplate({
          ...args,
          include: (x: string, v: {}) => require('./' + path.join('templates', x)).default(v),
          commits,
          packages,
        });
  
        if (args.stdout || !githubToken) {
          console.log(markdown);
          process.exit(0);
        }
  
        // Check if we need to edit or create a new one.
        return ghGot('repos/angular/angular-cli/releases').then((x: JsonObject) => [x, markdown]);
      })
      .then(([body, markdown]) => {
        const json = body.body;
  
        const maybeRelease = json.find((x: JsonObject) => x.tag_name == args.to);
        const id = maybeRelease ? `/${maybeRelease.id}` : '';
  
        const semversion = (args.to && semver.parse(args.to)) || { prerelease: '' };
  
        return ghGot('repos/angular/angular-cli/releases' + id, {
          body: {
            body: markdown,
            draft: !maybeRelease,
            name: args.to,
            prerelease: semversion.prerelease.length > 0,
            tag_name: args.to,
            ...(toSha ? { target_commitish: toSha } : {}),
          },
          token: githubToken,
        });
      });
  }
  