title: Why does Jest needs Babel to test async code?
body: <p>The Jest <a href="https://jestjs.io/docs/en/tutorial-async" rel="noreferrer">"An Async Example" guide</a> starts with:</p>
  
  <blockquote>
    <p>First, enable Babel support in Jest...</p>
  </blockquote>
  
  <p>But I miss to see why and where does Jest needs Babel for.</p>