René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`fs.watch()` listener called with `null` `filename` argument","articleBody":"### Version\n\nmain (commit 159ae48f8cd3)\n\n### Platform\n\n```text\nSunOS smartos 5.11 joyent_20260122T000642Z i86pc i386 i86pc\n```\n\n### Subsystem\n\nfs\n\n### What steps will reproduce the bug?\n\n```js\nconst fs = require('fs');\n\nconst watcher = fs.watch('.', {\n  recursive: false // The test passes if this option is set to `true`.\n});\n\nwatcher.on('change', function (event, filename) {\n  console.log(event, filename);\n\n  if (filename === 'file.txt') {\n    watcher.close();\n  }\n});\n\nsetTimeout(function () {\n  fs.writeFileSync('file.txt', 'data');\n}, 100);\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`change file.txt` is written to the standard output and the process exits. This is what happens when the `recursive` option is set to `true`.\n\n### What do you see instead?\n\n`change null` is written to the standard output and the process does not exit.\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/lpinca","@type":"Person","name":"lpinca"},"datePublished":"2026-01-25T18:36:12.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/61520/node/issues/61520"}