Why IE 11 display blank page rendering react app

Question

I have an issue with IE 11 and my react app. I use Webpack, babel and polyfill.io cdn and all is nice until rendering bundeled file, then it stops doing anything. Do you hav

Answer 1

Not any polyfill on earth seemed to help so I debugged for ages and finally figured out from a React developer "error" (only seen in IE11 dev. tools):

The above error occurred in the 
 component:
in h2 (created by CMSHeading)
// ...

Which had:

const {
  ...styles
} = this.props;
return (
...
);

The only thing was that I was accidentally sending other stuff down that wasn't just css styles but Objects etc. So I made sure that I was only sending real styles to it and then everything started working again :)