chore: remove SIGTERM event handler

[9aoy]

Summary

• Remove SIGTERM event handler which will cause the main process unexpected exit when the child process exit timeout.
• Add an exit handler to detect unexpected exit events that occur before the test ends.

rstest will tigger exit event in SIGTERM event, and the following code in test will cause main process unexpected exit with code 0.

process.on('exit', (code) => {
	console.log('exit', process.pid, code)
  for (let i = 0; i < Number.MAX_SAFE_INTEGER; i++) {}
  console.log('never called');
  process.exit(0);
});

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR refactors the worker termination handling by moving SIGTERM signal management from manual lifecycle management to Tinypool's built-in teardown hook. The changes simplify the code by removing the module-level onExit function and delegating worker termination to the pool manager.

Key changes:

• Exported a new teardown function to be called by Tinypool when terminating workers
• Removed manual SIGTERM handler registration/deregistration from the test execution lifecycle
• Configured the forks pool to use the new teardown hook via the teardown: 'teardown' option

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/runtime/worker/index.ts	Removed module-level onExit function and manual SIGTERM handler management; added exported teardown function for Tinypool lifecycle integration
packages/core/src/pool/forks.ts	Configured Tinypool to use the exported teardown function by adding teardown: 'teardown' to pool options

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[github-actions]

📝 Rstest Ecosystem CI: Open

suite	result
rsbuild	✅ success
rslib	✅ success
rsdoctor	✅ success