title: Type Error - Is Not a Constructor
body: <p>Wanted to instantiate a module within ES6 javascript and transpile to ES5. I am setting up a new class in my project which is es6 / webpack.
  I have 2 files: 
  track.js which has the following -- </p>
  
  <pre><code>export default class Track {
    constructor() {
      this.o = {};
    }
  }
  </code></pre>
  
  <p>The other is index.js -- </p>
  
  <pre><code>import { Track } from './track';
  
  const track = new Track();
  console.log(track);
  </code></pre>
  
  <p>I am trying to have console log show an empty object.
  Instead, I am getting --
  <em>Uncaught TypeError: _track.Track is not a constructor</em></p>