René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`fs.readSync` does not validate invalid `position` type (accepts object instead of throwing)","articleBody":"### Version\n\nv24.13.1\n\n### Platform\n\n```text\nLinux KContainer 5.10.0-12-amd64 #1 SMP Debian 5.10.103-1 (2022-03-07) x86_64 x86_64 x86_64 GNU/Linux\n```\n\n### Subsystem\n\n_No response_\n\n### What steps will reproduce the bug?\n\nHi,\n\nI would like to report a behavior in Node that can be reproduced by running the below snippet\n```javascript\n\"use strict\"\nimport fs from 'node:fs';\nimport os from 'node:os';\nimport path from 'node:path';\n\nconst memPath = fs.mkdtempSync(path.join(os.tmpdir(), 'node-temp-'));\nconst memFile = path.join(memPath, 'tempfile');\nfs.writeFileSync(memFile, '');\n\n// Open the file for reading and writing\nconst fd = fs.openSync(memFile, 'r+');\n\nconst ankor = new TextEncoder().encode('');\n\n// This call is intentionally incorrect: `position` should be a number or null.\ntry {\n  fs.readSync(fd, ankor, 0, ankor.length, { not: 'a number' } /* invalid position */);\n  console.log('fs.readSync did not throw as expected');\n} catch (err) {\n  console.log('fs.readSync threw an error as expected:', err instanceof TypeError ? 'TypeError' : err.name, '-', err.message);\n}\n\nfs.closeSync(fd);\n```\n\n### How often does it reproduce? Is there a required condition?\n\nNo special condition for reproduction\n\n### What is the expected behavior? Why is that the expected behavior?\n\nPosition argument must be a number and error should be thrown\nAccording to the documentation it should be number: https://nodejs.org/api/fs.html#fsreadsyncfd-buffer-offset-length-position\n```\nroot@KContainer:~/14128# deno run -A poc.mjs\nfs.readSync threw an error as expected: TypeError - The \"position\" argument must be of type bigint or integer. Received an instance of Object\n```\n\n### What do you see instead?\n\nDoes not throw even in strict mode\n```\nroot@KContainer:~/14128# node poc.mjs\nfs.readSync did not throw as expected\n```\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/kevgeoleo","@type":"Person","name":"kevgeoleo"},"datePublished":"2026-04-08T13:13:02.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/62638/node/issues/62638"}