fix: make babel-node spawned process bubble msg

[lambertkevin]

Q	A
Fixed Issues?	Fix #4554
Patch: Bug Fix?	Yes
Tests Added + Pass?	No
Any Dependency Changes?	No
License	MIT

Just linked the subprocess messages events to the process.send in order to bubble the event and make it listenable when spawning a subprocess with babel-node.

[lambertkevin]

Couldn't really find out the process to create the test yet. But this would make it successful:

parent.js

const { spawn } = require('child_process');

const child = spawn('babel-node', ['child.js'], {
  stdio: ['inherit', 'inherit', 'inherit', 'ipc']
});

child.on('message', (msg) => {
   expect(msg).to.be.equal('hello');
   done();
});

child.js

process.send('hello');

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[nicolo-ribaudo]

Thanks! I can try working on a test based on your code.

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/44576/

[lambertkevin]

@nicolo-ribaudo I squashed the typo and a linting error. I might need some help to understand the Publish to local Verdaccio registry (pull_request)test that fails, 'cause I've no idea what it is.

EDIT: Ok nvm, looks like it passed this time 🤷‍♂️

[nicolo-ribaudo]

Test added! It's indeed failing without your change.

For reviewers: please review my commit separately, since one only renames files but git doesn't properly track the rename when viewing the commit together.

[JLHwung]

Thanks!

[lambertkevin]

Test added! It's indeed failing without your change.

For reviewers: please review my commit separately, since one only renames files but git doesn't properly track the rename when viewing the commit together.

Thanks for your help with the tests @nicolo-ribaudo 👍

[nicolo-ribaudo]

Ok it looks like I have to increase the timeout

[JLHwung]

The shebang in bin/babel-node may not work on Windows, consider invoke babel-node via node.

[nicolo-ribaudo]

The windows test is failing with https://stackoverflow.com/questions/63303200/node-child-process-spawn-bad-file-descriptor-on-windows-with-ipc 🤔

[lambertkevin]

Thanks @nicolo-ribaudo @JLHwung

[nicolo-ribaudo]

Thanks for the fix!