Method subscribe

src/feed.ts:549–564

* Subscribes to any changes in the feed, return a promise * @link https://getstream.io/activity-feeds/docs/node/web_and_mobile/?language=js#subscribe-to-realtime-updates-via-api-client * @method subscribe * @memberof StreamFeed.prototype * @param {function} Faye.Callback<RealTimeMessage

(callback: Faye.SubscribeCallback<RealTimeMessage<StreamFeedGenerics>>)

   * });
   */
  subscribe(callback: Faye.SubscribeCallback<RealTimeMessage<StreamFeedGenerics>>) {
    if (!this.client.appId) {
      throw new SiteError(
        'Missing app id, which is needed to subscribe, use var client = stream.connect(key, secret, appId);',
      );
    }

    const subscription = this.getFayeClient().subscribe(`/${this.notificationChannel}`, callback);
    this.client.subscriptions[`/${this.notificationChannel}`] = {
      token: this.token,
      userId: this.notificationChannel,
      fayeSubscription: subscription,
    };

    return subscription;
  }

  /**
   * Cancel updates created via feed.subscribe()