title: RxJS dependency issue with Scheduler.async
body: <p>I have the following code inside the constructor of my Angular2 component class:</p>
  
  <pre><code>var observable = Observable.create(function (observer) {
        observer.next(1);
        observer.next(2);
        observer.next(3);
        observer.complete();
      }).observeOn(Scheduler.async);
  </code></pre>
  
  <p>I imports include the following:</p>
  
  <pre><code>import { Observable } from 'rxjs/Observable';
  import 'rxjs/add/operator/observeOn';
  import { Scheduler } from 'rxjs/Scheduler';
  import 'rxjs/scheduler/async';
  </code></pre>
  
  <p>I tried the following import as well instead of the last import above:</p>
  
  <pre><code>import { async } from 'rxjs/scheduler/async';
  </code></pre>
  
  <p>I have the following error message while building my project using Angulat CLI:</p>
  
  <pre><code>Property 'async' does not exist on type 'typeof Scheduler'
  </code></pre>
  
  <p>What am I missing?</p>