title: Typescript and File Upload with JQuery Definitions
body: <p>I'm using typescript and I have a file upload form.  But my typescript is returning an error.  </p>
  
  <pre><code>$('body').on('change', '#upload_button input[type="file"]', (evt)=&gt;{
      let file_list = evt.target.files;
  });
  </code></pre>
  
  <p>This is the error: </p>
  
  <blockquote>
    <p>Property 'files' does not exist on type 'Element'</p>
  </blockquote>
  
  <p>How can I fix this error?</p>