René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"worker: `messageerror` listeners remain during `exit`","articleBody":"## Version\n\nv24.14.1\n\nThe typo is also present in the v26.8.1 source and \nin the current `main` branch.\n\n## Platform\n\n```text\nMicrosoft Windows NT 10.0.26200.0 x64\n```\n\n## Subsystem\n\nworker_threads\n\n## What steps will reproduce the bug?\n\nRun the following without any third-party dependencies:\n\n```js\nconst { Worker } = require('node:worker_threads');\n\nconst worker = new Worker('', { eval: true });\nconst listener = () => {};\n\nworker.on('message', listener);\nworker.on('messageerror', listener);\n\nworker.on('exit', () => {\n  console.log({\n    message: worker.listenerCount('message'),\n    messageerror: worker.listenerCount('messageerror'),\n  });\n});\n```\n\n## How often does it reproduce? Is there a required condition?\n\nIt reproduces every time on v24.14.1 and on the current `main` branch at\n`7177c14789a7376866dfe6c04f5cd4da489cfbe6`. It occurs both when a worker exits\nnormally and when it is stopped with `worker.terminate()`.\n\n## What is the expected behavior? Why is that the expected behavior?\n\nBoth messaging listener counts should be zero while the `exit` listener is\nrunning:\n\n```text\n{ message: 0, messageerror: 0 }\n```\n\nThe worker exit cleanup explicitly removes the `message` listeners before\nemitting `exit` and appears intended to do the same for `messageerror`.\n\n## What do you see instead?\n\nThe `message` listener is removed, but the `messageerror` listener is still\npresent:\n\n```text\n{ message: 0, messageerror: 1 }\n```\n\n## Additional information\n\nThe targeted cleanup currently calls\n`removeAllListeners('messageerrors')`, but the event name is `messageerror`:\n\nhttps://github.com/nodejs/node/blob/7177c14789a7376866dfe6c04f5cd4da489cfbe6/lib/internal/worker.js#L395-L396\n\nThe typo was introduced in commit `5968c5423530aeaa10c02eae3e8423c6514cdd1a`:\n\nhttps://github.com/nodejs/node/commit/5968c5423530aeaa10c02eae3e8423c6514cdd1a\n\nThere is a later generic `removeAllListeners()` call after the `exit` event is\nemitted, so this report does not claim a persistent listener leak. The observed\nproblem is that the targeted pre-`exit` cleanup does not remove `messageerror`\nlisteners as intended.\n","author":{"url":"https://github.com/kiliczsh","@type":"Person","name":"kiliczsh"},"datePublished":"2026-09-04T09:49:08Z","url":"https://github.com/nodejs/node/issues/65782"}