Fuck you Edge!
I can name a var "screen", what is wrong with you? I don't care you have an Object named Screen, they are not the same and I rather use my own, thank you. It's not like I'm "let var=" on you, you piece of shit!

Im pretty sure there is also window["screen"] in js, not just capital S.

@WIPocket
This happened just on edge, it worked fine even on ie11 and safari.
It used an object similar to window, but didn't had any of the attributes I needed, nstead of my one 😀 renaming the object fixed it

Some native objects are "overrideable". Not sure if its official, but some browers just allow it.
Also, were you defining it on global scope? If not there shouldnt be a problem unless(cough) Edge sucks and doesnt know its scopes.

@WIPocket
It was 😀 I wasn't even trying to override, I wasn't aware of its existence, the name suited me.