Event.ERROR is undefined if don't import Event object.

[oldmtn]

This PR will...

Why is this Pull Request needed?

Are there any points in the code the reviewer needs to double check?

Resolves issues:

Checklist

• changes have been done against master branch, and PR does not conflict
• no commits have been done in dist folder (we will take care of updating it)
• new unit / functional tests have been added (whenever applicable)
• API or design changes are documented in API.md

[tchakabam]

Ha! :)

This should been detected by the linter. Weird.

[tchakabam]

So. Eslint thinks this is a browser DOM event as one of W3C EventTarget ... :)

We need to get rid of that env browser flag and take things from window explicitly. It's just too risky to operate like so.

[tchakabam]

by the way, the same problem is in decryptor.js :)

@oldmtn will push a patch and you can merge that into this branch

[tchakabam]

@oldmtn Hey, thanks for the contribution, I made a more general fix here that addresses the root problem and not only this specific case: #1756

[oldmtn]

You are welcome!:)