I am a bit concerned that these two might suddenly be swapped in one day. For example, if rollup changes its chunking mechanism or renaming algorithm, or our code changes somehow changes the import order.

Hmm true. I guess it would be safer if they aren't using namespaces at all, so the worst case is the confusing names.

Maybe I'll need to find another way to handle this, checking import-by-import perhaps then swapping it out 🤔

Could this be tested somehow to detect if the order was changed so you can keep the current code?

Running a typecheck after building the types could work, but we'd need a cover all the possible JS APIs. I'm currently working on a more strict approach that maybe helps with this.

The last commit should be stricter now. Unfortunately it's a little more code.