Polyfill failing on UWP Edge Mobile when including polyfill script on index.html

[cnourai]

I'm submitting a bug report

• Library Version:
  1.3.3

Please tell us about your environment:

• Operating System:
  Windows 10

• Node Version:
  8.5.X

• NPM Version:
  3.8.9

• JSPM OR Webpack AND Version
  Webpack 3.12.0

• Browser:
  Edge Mobile 44.X from UWP

• Language:
  javascript

Current behavior:
Webpage does not load on any page because edge is failing on index.html when we call

<script src="{{basePathToken}}/dist/vendor-bundle.js"></script>
<script src="{{basePathToken}}/dist/polyfill-bundle.js"></script>

In which the polyfill.js fails giving this error:

Expected/desired behavior:

• What is the expected behavior?
  Any page of the website should load

• What is the motivation / use case for changing the behavior?
  possible browser not supported ?

[cnourai]

I might add that it worked fine on an earlier version of edge mobile until the microsoft update a week or so ago