How to use

getInitialNotification

function

in

Module

// 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)
    }
   });

.getInitialNotification()
.then(remoteMessage => {
  if (remoteMessage) {