Handle interfaces with reserved names nicely

[Maxim-Mazurok]

There are interfaces such as Function in types/gapi.client.cloudfunctions-v2/index.d.ts, for example.

This is kinda reserved word, similar to Object or Symbol, and we probably don't want to mess with that.

However it seems to be scoped, so isn't a big deal. Did cause some false-positives with eslint though.