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[Bug]: processChild fails to initialize under certain conditions when a custom ESM loader is present

See original GitHub issue

Version

27.3.1

Steps to reproduce

Clone https://github.com/kherock/jest-worker-spawn-bug
- please look through the README for additional context!
- this repo is using Yarn 3, however I can confirm that this issue isn’t Yarn-specific.
Run the example worker script with the custom ESM loader:

yarn install
yarn worker-with-loader

Expected behavior

The worker should initialize and run the procedure.

Actual behavior

The worker misses the initialization message and hangs until something requests for it to be killed.

Additional context

This appears to be a timing-sensitive issue. I’ll try to test this on some other platforms when I have time. Also, since this uses --experimental-loader, I suspect this might be a Node.js bug/quirk. However, the current use of ChildProcess.send feels unsound.

I’ve also written up some more context in the reproduction repo readme:

https://github.com/kherock/jest-worker-spawn-bug/blob/main/README.md

Environment

System:
    OS: macOS 11.5.2
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
  Binaries:
    Node: 14.18.1 - ~/.volta/tools/image/node/14.18.1/bin/node
    Yarn: 3.2.0-rc.3.git.20211110.hash-83311e1d4 - ~/.volta/tools/image/yarn/1.22.11/bin/yarn
    npm: 6.14.15 - ~/.volta/tools/image/node/14.18.1/bin/npm

Issue Analytics

State:
Created 2 years ago
Comments:5 (4 by maintainers)

Top GitHub Comments

2reactions

merceyzcommented, Feb 8, 2022

https://github.com/nodejs/node/pull/41221 has shipped in Node.js v16.14 and v17.4

1reaction

merceyzcommented, Nov 29, 2021

This seems to be a known issue in Node.js https://github.com/nodejs/node/issues/39140 / https://github.com/nodejs/node/issues/37782 with a solution in https://github.com/nodejs/node/issues/37782#issuecomment-801330314

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