## Service

  currentUser: BehaviorSubject<ApplicationUser>;

  constructor(private http: HttpClient, private router: Router) {
    this.currentUser = new BehaviorSubject(JSON.parse(localStorage.getItem('currentUser')));
  }

## Component
  currentUser: ApplicationUser;

  ngOnInit() {
    this.authService.currentUser.subscribe((userData: ApplicationUser) => { this.currentUser = userData; });
  }

## Setter of currentUser
  func() {
    const user: ApplicationUser = {
      Email: 'as',
      Id: 'a12'
    };
    this.authService.currentUser.next(user);
  }