Polyfill types are declaring global variables

[grncdr]

It seems that polyfills (and in particular the submit-event.ts) are not being interpreted as a module. This leads to the variable declarations appearing as global.

For example, put this in a typescript file:

import "@hotwired/turbo"

submittersByForm. // auto-complete works here, even though this variable is not global

I noticed this issue because another project copied the submit-event.ts polyfill and they are generating conflicting types, but the core issue is here in @hotwired/turbo.

I am not familiar with rollup, but I think this can be fixed by simply adding export {} to the file somewhere, so that TypeScript knows to interpret it as a module and not a global script.

I verified that adding export {} corrects the issue.