beforeEach(async () => {
    const registry = new schema.CoreSchemaRegistry();
    registry.addPostTransform(schema.transforms.addUndefinedDefaults);
    testArchitectHost = new TestingArchitectHost();
    architect = new Architect(testArchitectHost, registry);

    options = {};
    called = 0;
    testArchitectHost.addBuilder('package:test', createBuilder(async o => {
      called++;
      options = o;

      return new Promise<BuilderOutput>(resolve => {
        setTimeout(() => resolve({ success: true }), 10);
      });
    }));
    testArchitectHost.addBuilder('package:test-options', createBuilder(o => {
      options = o;

      return { success: true };
    }));

    testArchitectHost.addTarget(target1, 'package:test');
    testArchitectHost.addTarget(target2, 'package:test');
  });

export async function generateBrowserWebpackConfigFromContext(
  options: BrowserBuilderSchema,
  context: BuilderContext,
  webpackPartialGenerator: (wco: BrowserWebpackConfigOptions) => webpack.Configuration[],
  host: virtualFs.Host<fs.Stats> = new NodeJsSyncHost(),
): Promise<{ workspace: experimental.workspace.Workspace, config: webpack.Configuration[] }> {
  const registry = new schema.CoreSchemaRegistry();
  registry.addPostTransform(schema.transforms.addUndefinedDefaults);

  const workspace = await experimental.workspace.Workspace.fromPath(
    host,
    normalize(context.workspaceRoot),
    registry,
  );

  const projectName = context.target ? context.target.project : workspace.getDefaultProjectName();

  if (!projectName) {
    throw new Error('Must either have a target from the context or a default project.');
  }

  const config = await generateBrowserWebpackConfigFromWorkspace(
    options,
    context,
    projectName,
    workspace,
    host,
    webpackPartialGenerator,
    context.logger,
  );

  return { workspace, config };
}

  beforeEach(() => {
    registry = new schema.CoreSchemaRegistry([]);
    registry.registerUriHandler((uri: string) => {
      if (uri.startsWith('ng-cli://')) {
        const content = readFileSync(
          join(__dirname, '..', uri.substr('ng-cli://'.length)), 'utf-8');

        return Promise.resolve(JSON.parse(content));
      } else {
        return null;
      }
    });
  });

  beforeEach(async () => {
    await host.initialize().toPromise();

    const registry = new schema.CoreSchemaRegistry();
    registry.addPostTransform(schema.transforms.addUndefinedDefaults);

    const workspace = await experimental.workspace.Workspace.fromPath(host, host.root(), registry);
    const architectHost = new TestingArchitectHost(
      host.root(),
      host.root(),
      new WorkspaceNodeModulesArchitectHost(workspace, host.root()),
    );
    architect = new Architect(architectHost, registry);
  });

async function main(args: string[]): Promise<number> {
  /** Parse the command line. */
  const argv = minimist(args, { boolean: ['help'] });

  /** Create the DevKit Logger used through the CLI. */
  const logger = createConsoleLogger(argv['verbose']);

  // Check the target.
  const targetStr = argv._[0] || '';
  if (!targetStr || argv.help) {
    // Show architect usage if there's no target.
    usage(logger);
  }

  // Load workspace configuration file.
  const currentPath = process.cwd();
  const configFileNames = [
    'angular.json',
    '.angular.json',
    'workspace.json',
    '.workspace.json',
  ];

  const configFilePath = findUp(configFileNames, currentPath);

  if (!configFilePath) {
    logger.fatal(`Workspace configuration file (${configFileNames.join(', ')}) cannot be found in `
      + `'${currentPath}' or in parent directories.`);

    return 3;
  }

  const root = path.dirname(configFilePath);
  const configContent = readFileSync(configFilePath, 'utf-8');
  const workspaceJson = JSON.parse(configContent);

  const registry = new schema.CoreSchemaRegistry();
  registry.addPostTransform(schema.transforms.addUndefinedDefaults);

  const host = new NodeJsSyncHost();
  const workspace = new experimental.workspace.Workspace(normalize(root), host);

  await workspace.loadWorkspaceFromJson(workspaceJson).toPromise();

  // Clear the console.
  process.stdout.write('\u001Bc');

  return await _executeTarget(logger, workspace, root, argv, registry);
}

export function formatValidator(
  data: JsonValue,
  dataSchema: JsonObject,
  formats: schema.SchemaFormat[],
): Observable<schema.SchemaValidatorResult> {
  const registry = new schema.CoreSchemaRegistry();

  for (const format of formats) {
    registry.addFormat(format);
  }

  return registry
    .compile(dataSchema)
    .pipe(mergeMap(validator => validator(data)));
}

  async function createArchitect(workspaceRoot: string) {
    vfHost = new NodeJsSyncHost();
    const configContent = fs.readFileSync(path.join(workspaceRoot, 'angular.json'), 'utf-8');
    const workspaceJson = JSON.parse(configContent);

    const registry = new schema.CoreSchemaRegistry();
    registry.addPostTransform(schema.transforms.addUndefinedDefaults);

    const workspace = new experimental.workspace.Workspace(normalize(workspaceRoot), vfHost);
    await workspace.loadWorkspaceFromJson(workspaceJson).toPromise();

    testArchitectHost = new TestingArchitectHost(workspaceRoot, workspaceRoot,
      new WorkspaceNodeModulesArchitectHost(workspace, workspaceRoot));
    architect = new Architect(testArchitectHost, registry);
  }

export async function createArchitect(workspaceRoot: Path) {
  const registry = new schema.CoreSchemaRegistry();
  registry.addPostTransform(schema.transforms.addUndefinedDefaults);
  const workspaceSysPath = getSystemPath(workspaceRoot);

  const workspace = await experimental.workspace.Workspace.fromPath(host, host.root(), registry);
  const architectHost = new TestingArchitectHost(
    workspaceSysPath,
    workspaceSysPath,
    new WorkspaceNodeModulesArchitectHost(workspace, workspaceSysPath),
  );
  const architect = new Architect(architectHost, registry);

  return {
    workspace,
    architectHost,
    architect,
  };
}

export async function runCommand(
  args: string[],
  logger: logging.Logger,
  workspace: CommandWorkspace,
  commands?: CommandMapOptions,
): Promise<number | void> {
  if (commands === undefined) {
    const commandMapPath = findUp('commands.json', __dirname);
    if (commandMapPath === null) {
      throw new Error('Unable to find command map.');
    }
    const cliDir = dirname(commandMapPath);
    const commandsText = readFileSync(commandMapPath).toString('utf-8');
    const commandJson = json.parseJson(
      commandsText,
      JsonParseMode.Loose,
      { path: commandMapPath },
    );
    if (!isJsonObject(commandJson)) {
      throw Error('Invalid command.json');
    }

    commands = {};
    for (const commandName of Object.keys(commandJson)) {
      const commandValue = commandJson[commandName];
      if (typeof commandValue == 'string') {
        commands[commandName] = resolve(cliDir, commandValue);
      }
    }
  }

  // This registry is exclusively used for flattening schemas, and not for validating.
  const registry = new schema.CoreSchemaRegistry([]);
  registry.registerUriHandler((uri: string) => {
    if (uri.startsWith('ng-cli://')) {
      const content = readFileSync(join(__dirname, '..', uri.substr('ng-cli://'.length)), 'utf-8');

      return Promise.resolve(JSON.parse(content));
    } else {
      return null;
    }
  });

  // Normalize the commandMap
  const commandMap: CommandDescriptionMap = {};
  for (const name of Object.keys(commands)) {
    const schemaPath = commands[name];
    const schemaContent = readFileSync(schemaPath, 'utf-8');
    const schema = json.parseJson(schemaContent, JsonParseMode.Loose, { path: schemaPath });
    if (!isJsonObject(schema)) {
      throw new Error('Invalid command JSON loaded from ' + JSON.stringify(schemaPath));
    }

    commandMap[name] =
      await parseJsonSchemaToCommandDescription(name, schemaPath, registry, schema);
  }

  let commandName: string | undefined = undefined;
  for (let i = 0; i < args.length; i++) {
    const arg = args[i];

    if (arg in commandMap) {
      commandName = arg;
      args.splice(i, 1);
      break;
    } else if (!arg.startsWith('-')) {
      commandName = arg;
      args.splice(i, 1);
      break;
    }
  }

  // if no commands were found, use `help`.
  if (commandName === undefined) {
    if (args.length === 1 && args[0] === '--version') {
      commandName = 'version';
    } else {
      commandName = 'help';
    }
  }

  let description: CommandDescription | null = null;

  if (commandName !== undefined) {
    if (commandMap[commandName]) {
      description = commandMap[commandName];
    } else {
      Object.keys(commandMap).forEach(name => {
        const commandDescription = commandMap[name];
        const aliases = commandDescription.aliases;

        let found = false;
        if (aliases) {
          if (aliases.some(alias => alias === commandName)) {
            found = true;
          }
        }

        if (found) {
          if (description) {
//.........这里部分代码省略.........

async function _renderUniversal(
  options: BuildWebpackAppShellSchema,
  context: BuilderContext,
  browserResult: BrowserBuilderOutput,
  serverResult: ServerBuilderOutput,
): Promise<BrowserBuilderOutput> {
  const browserIndexOutputPath = path.join(browserResult.outputPath || '', 'index.html');
  const indexHtml = fs.readFileSync(browserIndexOutputPath, 'utf8');
  const serverBundlePath = await _getServerModuleBundlePath(options, context, serverResult);

  const root = context.workspaceRoot;
  requireProjectModule(root, 'zone.js/dist/zone-node');

  const renderModuleFactory = requireProjectModule(
    root,
    '@angular/platform-server',
  ).renderModuleFactory;
  const AppServerModuleNgFactory = require(serverBundlePath).AppServerModuleNgFactory;
  const outputIndexPath = options.outputIndexPath
    ? path.join(root, options.outputIndexPath)
    : browserIndexOutputPath;

  // Render to HTML and overwrite the client index file.
  const html = await renderModuleFactory(AppServerModuleNgFactory, {
    document: indexHtml,
    url: options.route,
  });

  fs.writeFileSync(outputIndexPath, html);

  const browserTarget = targetFromTargetString(options.browserTarget);
  const rawBrowserOptions = await context.getTargetOptions(browserTarget);
  const browserBuilderName = await context.getBuilderNameForTarget(browserTarget);
  const browserOptions = await context.validateOptions<JsonObject & BrowserBuilderSchema>(
    rawBrowserOptions,
    browserBuilderName,
  );

  if (browserOptions.serviceWorker) {
    const host = new NodeJsSyncHost();
    // Create workspace.
    const registry = new schema.CoreSchemaRegistry();
    registry.addPostTransform(schema.transforms.addUndefinedDefaults);

    const workspace = await experimental.workspace.Workspace.fromPath(
      host,
      normalize(context.workspaceRoot),
      registry,
    );
    const projectName = context.target ? context.target.project : workspace.getDefaultProjectName();

    if (!projectName) {
      throw new Error('Must either have a target from the context or a default project.');
    }
    const projectRoot = resolve(
      workspace.root,
      normalize(workspace.getProject(projectName).root),
    );

    await augmentAppWithServiceWorker(
      host,
      normalize(root),
      projectRoot,
      join(normalize(root), browserOptions.outputPath),
      browserOptions.baseHref || '/',
      browserOptions.ngswConfigPath,
    );
  }

  return browserResult;
}