Angular 2: Convert Observable to Promise

Question

Q) How do I convert the following observable to a promise so I can call it with .then(...)?

My method I want to convert to a promise:

Answer 1

you dont really need to do this just do ...

import 'rxjs/add/operator/first';


this.esQueryService.getDocuments$.first().subscribe(() => {
        event.enableButtonsCallback();
      },
      (err: any) => console.error(err)
    );
    this.getDocuments(query, false);

first() ensures the subscribe block is only called once (after which it will be as if you never subscribed), exactly the same as a promises then()