How to use the monaco-languageclient/lib.createMonacoServices function in monaco-languageclient

listenTo(lang: string) {
    const langUrl = this.createUrl(lang);
    const langWebSocket = this.createWebSocket(langUrl);
    const langService = createMonacoServices(this.editorControl.editor.getValue());

    this.log.info(`Connecting to ${lang} server`);

    listen({
      webSocket: langWebSocket,
      onConnection: connection => {
        // create and start the language client
        const languageClient = this.createLanguageClient(lang, connection, langService);
        const disposable = languageClient.start();
        connection.onClose(() => disposable.dispose());
        connection.onDispose(() => disposable.dispose());
        this.languageService.addConnection(lang, connection);
      }
    });
  }