signal-exit onExit callback not triggered in Bun during process shutdown

[kevgeoleo]

What version of Bun is running?

1.3.11-canary.1+9e93bfa1b

What platform is your computer?

Linux 5.10.0-12-amd64 x86_64 x86_64

What steps can reproduce the bug?

Hi,

I would like to report a behavior in Bun that can be reproduced using the below snippet:

import { onExit } from 'signal-exit';

onExit(function (code, signal) {
  console.log('process exited!');
}, { alwaysLast: true });

What is the expected behavior?

root@KContainer:~/21757# node test.mjs
process exited!
root@KContainer:~/21757# deno run -A test.mjs
process exited!

What do you see instead?

Bun does not print anything and exits
Bun does not consistently execute signal-exit onExit handlers during process termination, while Node.js and Deno do.

Additional information

No response

[robobun]

✅ Reproduced — Bun dispatched exit/beforeExit via the internal EventEmitter directly, bypassing user-patched process.emit. Fix in #29196.

[github-actions]

Found 1 possible duplicate issue:

1. signal-exit package misbehaves with Bun (node compatibility) #12918

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