How to use the @storybook/channel-postmessage function in @storybook/channel-postmessage

return decorateStory => {
    if (cache) {
      return cache;
    }
    let channel = null;
    if (isBrowser) {
      try {
        channel = addons.getChannel();
      } catch (e) {
        channel = createChannel({ page: 'preview' });
        addons.setChannel(channel);
      }
    }
    let storyStore;
    let clientApi;
    if (typeof window !== 'undefined' && window.__STORYBOOK_CLIENT_API__) {
      clientApi = window.__STORYBOOK_CLIENT_API__;
      // eslint-disable-next-line no-underscore-dangle
      storyStore = clientApi._storyStore;
    } else {
      storyStore = new StoryStore({ channel });
      clientApi = new ClientApi({ storyStore, decorateStory });
    }
    const { clearDecorators } = clientApi;
    const configApi = new ConfigApi({ clearDecorators, storyStore, channel, clientApi });

constructor() {
    super();

    const channel = createChannel({ page: 'manager' });

    addons.setChannel(channel);
    channel.emit(Events.CHANNEL_CREATED);

    this.addons = addons;
    this.channel = channel;
  }