Method subscribeToTopic

packages/firebase-messaging/index.ios.ts:115–125

(topic: string)

	}

	subscribeToTopic(topic: string): Promise<void> {
		return new Promise((resolve, reject) => {
			this.native.subscribeToTopicCompletion(topic, (error) => {
				if (error) {
					reject(FirebaseError.fromNative(error));
				} else {
					resolve();
				}
			});
		});
	}
	unregisterDeviceForRemoteMessages(): Promise<void> {
		return this._instance.unregisterDeviceForRemoteMessages();
	}