Parcel 2: Workers interaction w/ Yarn 2

[arcanis]

🐛 bug report

It's really more of a Node issue than a Parcel one tbh, but I think it should be tracked on both repositories, if only for better discoverability 🙂

Parcel 2 currently hangs when used with a Yarn 2 project because the workers are executed outside of the PnP context (because of nodejs/node#29117), and the error isn't properly cascaded back to the master process.

💁 Possible Solution

Apart from fixing this in Node, the alternative would be to:

• Manually send the script content using the eval option from new Worker, to avoid the crash when Node tries to read the in-zip file outside of the PnP context (it would work since the master thread can call readFile on its own files without problem).

• Forward the PnP path when detecting that the process is executing under a PnP environment (ie when the pnpapi name can be successfully resolved), so that the child thread can setup its own environment (ie call require(workerData.pnpPath).setup()).

Or to disable the workers codepath when detecting PnP (the process workers seem to work, as they spawn a new process which properly executes the --require entries), but that would be a shame.