[destus]

Shitbox2,

<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/5.5.3/Rx.min.js"></script>
<script>
      const bs = new Rx.BehaviorSubject(null);
      bs.subscribe(user => console.log(user))
      
      const currentUser = new Rx.Observable.of({login: 'test'})
      currentUser.subscribe(bs);
    </script>