subscribeToTopic method
Subscribe to topic in background.
topic
must match the following regular expression:
[a-zA-Z0-9-_.~%]{1,900}
.
Implementation
@override
Future<void> subscribeToTopic(String topic) {
throw UnimplementedError('''
subscribeToTopic() is not supported on the web clients.
To learn how to manage subscriptions for web users, visit the
official Firebase documentation:
https://firebase.google.com/docs/cloud-messaging/js/topic-messaging
''');
}