Parcel 2 compatibility

I've been scratching my head about how to build compatible workers, and this library is the most promising so far! Unfortunately, I use Parcel 2, and the basic demo runs into an error. 😢

auth.bd78dd40.js:1 Uncaught DOMException: Failed to execute 'importScripts' on 'WorkerGlobalScope': The URL './index.d6afe8b1.js' is invalid.
at http://localhost:1234/auth.bd78dd40.js:1:1
at blob:http://localhost:1234/13b36260-4ae6-4c43-845c-0dfccc529f9c:1:1

I thought I found a reference suggesting that you can't use this kind of relative path from a blob, but Parcel 2 can definitely handle workers in general (e.g. libraries like `comlink` work with `parcel server`). However, I can't seem to find that again.

I'd really like to use `threads.js`, but this is a big blocker for our use case. Any thoughts on where best to attempt to address this?