title: Promise in event publish ionic 2
body: <p>I am trying to learn about event publish and subscribe in ionic 2.
  Is it possible to add a promise as a parameter in an event.</p>
  
  <pre><code>events.publish('done',promise);
  </code></pre>
  
  <p>When i subscribe to it, its giving promise.then is not a function.</p>
  
  <pre><code>events.subscribe('done',(promise)=&gt;{
    promise.then(()=&gt;{
     console.log('Fulfilled');
    }
  </code></pre>
  
  <p>But instead of using the promise in the event publish,if i directly use it as</p>
  
  <pre><code>promise.then(()=&gt;{
   console.log('Fulfilled');
  }
  </code></pre>
  
  <p>Its working.</p>