TypeScript core.isJsonObject函數代碼示例

  return (tree) => {
    const angularConfigContent = tree.read('angular.json') || tree.read('.angular.json');

    if (!angularConfigContent) {
      return;
    }

    const angularJson = parseJson(angularConfigContent.toString(), JsonParseMode.Loose);

    if (!isJsonObject(angularJson) || !isJsonObject(angularJson.projects)) {
      // If that field isn't there, no use...
      return;
    }

    // For all projects
    for (const [name, project] of Object.entries(angularJson.projects)) {
      if (!isJsonObject(project)) {
        continue;
      }
      if (typeof project.root != 'string' || project.projectType !== 'application') {
        continue;
      }
      if (name.endsWith('-e2e')) {
        // Skip existing separate E2E projects
        continue;
      }

      const browserslistPath = join(normalize(project.root), 'browserslist');
      if (typeof project.sourceRoot === 'string') {
        // Move the CLI 7 style browserlist to root if it's there.
        const srcBrowsersList = join(normalize(project.sourceRoot), 'browserslist');
        if (tree.exists(srcBrowsersList) && !tree.exists(browserslistPath)) {
          // TODO: use rename instead.
          // This is a hacky workaround. We should be able to just rename it.
          // On unit tests the rename works fine but on real projects it fails with
          //     ERROR! browserslist does not exist..
          // This seems to happen because we are both renaming and then commiting an update.
          // But it's fine if we read/create/delete. There's a bug somewhere.
          // tree.rename(srcBrowsersList, browserslistPath);
          const content = tree.read(srcBrowsersList);
          if (content) {
            tree.create(browserslistPath, content);
            tree.delete(srcBrowsersList);
          }
        }
      }

      const source = tree.read(browserslistPath);
      if (!source) {
        tree.create(browserslistPath, browserslistContent);
      } else if (!source.toString().toLowerCase().includes('chrome 41')) {
        const recorder = tree.beginUpdate(browserslistPath);
        recorder.insertRight(source.length, '\nChrome 41 # Googlebot');
        tree.commitUpdate(recorder);
      }
    }

    return tree;
  };

  return (tree) => {
    // Simple. Take the ast of polyfills (if it exists) and find the import metadata. Remove it.
    const angularConfigContent = tree.read('angular.json') || tree.read('.angular.json');
    const rules: Rule[] = [];

    if (!angularConfigContent) {
      // Is this even an angular project?
      return;
    }

    const angularJson = parseJson(angularConfigContent.toString(), JsonParseMode.Loose);

    if (!isJsonObject(angularJson) || !isJsonObject(angularJson.projects)) {
      // If that field isn't there, no use...
      return;
    }

    // For all projects
    for (const projectName of Object.keys(angularJson.projects)) {
      const project = angularJson.projects[projectName];
      if (!isJsonObject(project)) {
        continue;
      }
      if (project.projectType !== 'application') {
        continue;
      }

      const architect = project.architect;
      if (!isJsonObject(architect)
        || !isJsonObject(architect.build)
        || !isJsonObject(architect.build.options)
        || typeof architect.build.options.polyfills !== 'string') {
        continue;
      }

      rules.push(dropES2015PolyfillsFromFile(architect.build.options.polyfills));
    }

    return chain(rules);
  };

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) {
//.........這裏部分代碼省略.........