René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"stream/iter: merge() does not abort pending read for a single source","articleBody":"### Version\n\nmain\n\n### Platform\n\n```text\nmacOS 26.5.2\n```\n\n### Subsystem\n\nstream\n\n### What steps will reproduce the bug?\n\n```js\nimport { merge } from 'node:stream/iter';\nimport { setTimeout } from 'node:timers/promises';\n\nconst source = {\n  [Symbol.asyncIterator]() { return this; },\n  next() { return new Promise(() => {}); },\n  return() {\n    console.log('source closed');\n    return { done: true };\n  },\n};\n\nconst iterator = merge(source, {\n  signal: AbortSignal.timeout(10),\n})[Symbol.asyncIterator]();\n\nconsole.log(await Promise.race([\n  iterator.next().then(null, (error) => error.name),\n  setTimeout(100, 'still pending'),\n]));\n```\n\n### How often does it reproduce? Is there a required condition?\n\nAlways\n\n### What is the expected behavior? Why is that the expected behavior?\n\n```console\nsource closed\nTimeoutError\n```\n\nAs per [§12.2 `Stream.merge()`](https://stream-iter.jasnell.me/#merge-method)\n> On cancellation (via signal or consumer break), call .return() on all active iterators and discard ready.\n\n### What do you see instead?\n\n```console\nstill pending\n```\n\nThe pending merged read remains unsettled and `source closed` is never printed\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/trivikr","@type":"Person","name":"trivikr"},"datePublished":"2026-07-12T05:19:59Z","url":"https://github.com/nodejs/node/issues/64444"}