How to run the demo in IE11

I’m trying to run the demo in IE11, but it displays an empty page and shows a (somewhat vague) JS error in the console.

I’m guessing that I need some polyfills to run it, but from the documentation it’s not clear what I should do. Could someone point me in the right direction?

The module loader used for the development demo doesn’t work on IE, so you’ll have to bundle the scripts (as on prosemirror.net) to get things to run there. No polyfills should be necessary.

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