MulticastMessage constructor
      
      MulticastMessage({ 
    
    
- Map<String, String> ? data,
- Notification? notification,
- AndroidConfig? android,
- WebpushConfig? webpush,
- ApnsConfig? apns,
- FcmOptions? fcmOptions,
- required List<String> tokens,
Implementation
MulticastMessage({
  super.data,
  super.notification,
  super.android,
  super.webpush,
  super.apns,
  super.fcmOptions,
  required this.tokens,
}) : super._();