René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"stream/iter: stateful stream transforms reject `null` output instead of emitting empty Uint8Array","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 { bytes, from, pull } from 'node:stream/iter';\n\nconst transform = {\n  async *transform() {\n    yield null;\n  },\n};\n\ntry {\n  console.log(await bytes(pull(from('x'), transform)));\n} catch (error) {\n  console.log(error.code, error.message);\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\nUint8Array(0) []\n```\n\nAs per [§9.3 Transforms](https://stream-iter.jasnell.me/#transforms)\n> Transform return values are flexible. A transform may return: null (no output)\n> To normalize transform output given value: if value is null, return null.\n\n`null` means no output, so the consumer completes with `Uint8Array(0) []`\n\n### What do you see instead?\n\n```console\nERR_INVALID_ARG_TYPE The \"value\" argument must be of type string or an instance of Uint8Array, ArrayBuffer, ArrayBufferView, Iterable, or AsyncIterable. Received null\n```\n\nA stateful transform yielding `null` throws `ERR_INVALID_ARG_TYPE`\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/trivikr","@type":"Person","name":"trivikr"},"datePublished":"2026-07-12T20:20:53Z","url":"https://github.com/nodejs/node/issues/64461"}