How to use

notification

function

in

RemoteMessage

// when the app is running, but in the backgroud
  messaging().onNotificationOpenedApp(remoteMessage => {
   console.log(
    '[FCMService] onNotificationOpenedApp Notification caused app to open',
   );
   if (remoteMessage) {
    const notification = remoteMessage.notification;
    onOpenNotification(notification);
    // this.removeDeliveredNotification(notification.notificationId)
   }
  });

// when the app is opened from a quit state.
  messaging()
   .getInitialNotification()
   .then(remoteMessage => {
    console.log(
     '[FCMService] getInitialNotification Notification caused app to open',
    );
    if (remoteMessage) {
     const notification = remoteMessage.notification;
     onOpenNotification(notification);
     // this.removeDeliveredNotification(notification.notificationId)
    }
   });

messaging().onMessage(async remoteMessage => {
   console.log('[FCMService] a new FCM message arrived!', remoteMessage);
   if (remoteMessage) {
    let notification = null;
    if (Platform.OS === 'ios') {
     notification = remoteMessage.data.notification;
    } else {
     notification = remoteMessage.notification;
    }
    onNotification(notification);
   }
  })