title: moment.tz() fails when I use it in ES6/react?
body: <p>Why does moment-timezone fail when I use it in ES6 javascript file?</p>
  
  <pre><code>import moment from 'moment';
  // import timezone from 'moment-timezone';
  
  const formatTime = ({timestamp}) =&gt; {
      const formattedDT = moment.tz(timestamp, 'America/Los_Angeles').format('YYYY-MM-DD HH:mm ZZ');
      return formattedDT;
  };
  </code></pre>