title: How do I import WebSocketSubject in TypeScript?
body: <p>As suggested I installed using</p>
  
  <pre><code>npm install @reactivex/rxjs@5.0.0-beta.11
  </code></pre>
  
  <p>I can import almost everything this way:</p>
  
  <pre><code>import { Observable, Subscriber } from '@reactivex/rxjs';
  </code></pre>
  
  <p>but not WebSocketSubject. I've tried:</p>
  
  <pre><code>import { WebSocketSubject } from '@reactivex/rxjs';
  import { WebSocketSubject } from '@reactivex/rxjs/observable/dom';
  </code></pre>
  
  <p>... and many other variations.</p>