Angular 6 - ForkJoin has no exported member : <p>I have updated to Angular 6 and I'm trying to use ForkJoin, so on my service I have:</p>

<pre><code>import { forkJoin } from 'rxjs/observable/forkJoin';
</code></pre>

<p>But it's not recognising is and I'm getting:</p>

<pre><code>...ForkJoin has no exported member
</code></pre>

<p>How can I fix this?</p>
