title: Why won't my default class import in ES6?
body: <p>I'm working with babel-loader inside webpack for the first time, and I'm very new to ES6 as well.  I'm trying to export a base class from one file and import it into another.  Exporting and importing has worked fine throughout my file thus far, and I am just now hitting a problem with it for the first time while trying to create classes.</p>
  
  <p>Here's what my code looks like:</p>
  
  <p><strong>BaseClient.js</strong></p>
  
  <pre><code>export default class BaseClient {
    // snip...
  };
  </code></pre>
  
  <p><strong>SessionClient.js</strong></p>
  
  <pre><code>import BaseClient from './BaseClient';
  
  // outputs "undefined":
  console.log(BaseClient);
  
  // throws "Uncaught TypeError: Super expression must either be null or a function, not undefined":
  export default class SessionClient extends BaseClient {
    // snip...
  };
  </code></pre>
  
  <p>Am I doing something wrong?  Is there any relevant information I'm missing from my question that's needed before diagnosing?  Thanks!</p>