René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"stream/iter: fromWritable().writev() leaves Writable corked when chunk validation throws","articleBody":"### Version\n\n26.1.0\n\n### Platform\n\n```text\nmacOS 26.5.0\n```\n\n### Subsystem\n\nstream\n\n### What steps will reproduce the bug?\n\n```js\nimport { strictEqual, throws } from \"node:assert\";\nimport { Writable } from \"node:stream\";\nimport { fromWritable } from \"node:stream/iter\";\n\nconst writable = new Writable({\n  write(chunk, enc, cb) {\n    cb();\n  },\n});\n\nconst writer = fromWritable(writable);\n\nthrows(() =\u003e writer.writev([new Uint8Array([1]), 42]), {\n  code: \"ERR_INVALID_ARG_TYPE\",\n});\n\n// Expected: writev() should uncork even when a later chunk conversion throws.\nstrictEqual(writable.writableCorked, 0);\n```\n\nRun with\n```console\nnode --experimental-stream-iter repro.js\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`fromWritable().writev()` should either complete the batched write or throw/reject without changing the underlying `Writable`’s corking state. If `writev()` internally calls `writable.cork()`, it should always pair that with `writable.uncork()`, including when converting or validating a later chunk throws.\n\n### What do you see instead?\n\nCalling `writer.writev([new Uint8Array([1]), 42])` throws `ERR_INVALID_ARG_TYPE`, but the wrapped classic `Writable` remains corked afterward (`writable.writableCorked === 1`). This happens because `writev()` corks before converting all chunks, and if `toUint8Array()` throws for a later chunk, the `uncork()` call is skipped.\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/trivikr","@type":"Person","name":"trivikr"},"datePublished":"2026-05-13T23:16:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/63294/node/issues/63294"}