When I use axios with SharePoint, it successfully works in Chrome but not in IE 11. The error is 'Promise' is undefined. Using the polyfill does not work either. Any ideas? Code below:

window.onload = function(){
  var endPointUrl = _spPageContextInfo.webAbsoluteUrl + 

These are the libraries I use

<script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.min.js"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script type="text/javascript" src="https://afhq.egovservices.net/sites/Isaac/Webparts/staffing/staffing.js"></script>

To make it work you should reference "auto" version of es6-polyfill:

<script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.auto.js"></script>

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