How to not use _firebaseMessaging.configure in flutter?

[AjayrajSingh]

I'm new to flutter and as stated in the Changlog of firebase_messaging repo configure method is been removed. Right now I'm having no clue how to change my existing code of firebase_messaging to adopt these BREAKING changes. Kindly help me in that. Here's my code snippet where I'm getting the issue:

  Future takeFCMTokenWhenAppLaunch() async {
    try {
      if (Platform.isIOS) {
        _firebaseMessaging.requestPermission(
            sound: true, badge: true, alert: true);
      }

      SharedPreferences prefs = await SharedPreferences.getInstance();
      String userToken = prefs.get('FCMToken');
      if (userToken == null) {
        _firebaseMessaging.getToken().then((val) async {
          print('Token: ' + val);
          prefs.setString('FCMToken', val);
          String userID = prefs.get('userId');
          if (userID != null) {
            FirebaseController.instanace.updateUserToken(userID, val);
          }
        });
      }

      // ===============Getting issue here====================
      _firebaseMessaging.configure(
        onMessage: (Map<String, dynamic> message) async {
          print("onMessage: $message");
          String msg = 'notibody';
          String name = 'chatapp';
          if (Platform.isIOS) {
            msg = message['aps']['alert']['body'];
            name = message['aps']['alert']['title'];
          } else {
            msg = message['notification']['body'];
            name = message['notification']['title'];
          }

          String currentChatRoom = (prefs.get('currentChatRoom') ?? 'None');

          if (Platform.isIOS) {
            if (message['chatroomid'] != currentChatRoom) {
              sendLocalNotification(name, msg);
            }
          } else {
            if (message['data']['chatroomid'] != currentChatRoom) {
              sendLocalNotification(name, msg);
            }
          }

          FirebaseController.instanace.getUnreadMSGCount();
        },
        onBackgroundMessage: Platform.isIOS ? null : myBackgroundMessageHandler,
        onLaunch: (Map<String, dynamic> message) async {
          print("onLaunch: $message");
        },
        onResume: (Map<String, dynamic> message) async {
          print("onResume: $message");
        },
      );
    } catch (e) {
      print(e.message);
    }
  }

_firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) async {
        completer.complete(message);
      },
    );

Any help will be highly appreciated. Thanks in advance.

[Pcol10]

I mentioned here your problem.

Look here for migration guide