Parcel 2 compatibility

[lgarron]

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?

[andywer]

Hey @lgarron!
Is the importScripts() call part of your worker code or is it threads.js that adds it?

[lgarron]

Hey @lgarron!
Is the importScripts() call part of your worker code or is it threads.js that adds it?

This is with the sample code, so it's either threads.js or Parcel 2 that adds it!

Here's a repro, which is basically the sample code:
https://github.com/lgarron/parcel-2-threads-repro

node master.js works in that repro, but npx parcel index.html runs into the error above.

[lgarron]

Anything simple I could do to help debug this?

[andywer]

Hmm, good question. Could you post the line with the failing importScripts() and the surrounding couple of lines?

Unfortunately I've already got a quite extensive backlog, so I'm afraid I won't have much time to look into this. If we can figure out the root of the issue, I could quickly prepare a fix, though.

[simplecommerce]

@lgarron long shot here but have you gotten it to work? I am having the same issue when I try to do a test using a simple function that returns a string and nothing seems to happen.

[lgarron]

Unfortunately not. I've given up on having a good development flow for web workers while several Parcel issues are still outstanding:

parcel-bundler/parcel#5504
parcel-bundler/parcel#5473
parcel-bundler/parcel#3959

I'm hoping to give it another try once those issues are in a better place.

[lgarron]

Also, the lack of module workers in Firefox/Safari is a real pain, along with some other things that are hard for Parcel and this library to work around:

https://github.com/lgarron/web-worker-compat-problems

[ProLoser]

Are you on nightly or next? Nightly fixes some of the module resolution logic but importing the same dependency from different webworkers creates bundling issues at the moment I think.

[lgarron]

Are you on nightly or next? Nightly fixes some of the module resolution logic but importing the same dependency from different webworkers creates bundling issues at the moment I think.

Ooooh, the latest nightly fixes https://github.com/lgarron/parcel-2-threads-repro

(The bundling issues are still a blocker for me, though.)

[ProLoser]

parcel-bundler/parcel#5430 I'm trying to get audio worklet detection working, if I can just login to opencollective and sponsor them for their hard work lol.

[andywer]

Great to see you all are looking into this!
I tried getting threads.js to work with Parcel 2 like one and a half years ago or so, but I gave up at some point as I would have needed to spend much more time on this and a lot of Parcel 2 felt very early stage back then.

I was hoping that by now they would have fixed most of the issues, though. Maybe not (yet)…

[ProLoser]

What solution did you end up with? I hate how much of my life is wasted on build pipelines

[andywer]

We just kept using Parcel v1 😄