title: ES6 - how to import connect-mongo (session)?
body: <p>In pre-ES6, this is how I import <code>connect-mongo</code> (session):</p>
  
  <pre><code>var MongoStore = require("connect-mongo")(session);
  </code></pre>
  
  <p>But how can I import it in ES6?</p>
  
  <pre><code>import MongoStore from 'connect-mongo';
  let monStore = MongoStore(session);
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>const Store = connect.Store || connect.session.Store;
                                                    ^
  
  TypeError: Cannot read property 'Store' of undefined
  </code></pre>
  
  <p>Any ideas?</p>