Progressive Web Apps with React

Changing the user inside NotificationResource

We already have a method to handle user changes inside App.js--our old friend, onAuthStateChanged. Let's hook in to that, and use that to call a method inside NotificationResource:

componentDidMount() {   this.notifications = new NotificationResource(firebase.messaging(), firebase.database());  firebase.auth().onAuthStateChanged((user) => {     if (user) {       this.setState({ user });       this.listenForMessages();       this.notifications.changeUser(user);     } else {       this.props.history.push('/login')     }   });

Then, inside NotificationResource:

changeUser(user) {   this.user = user; }

Incidentally, this helps us solve another problem with tokens. As noted earlier, onTokenRefresh is called when a new token is generated, either ...