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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ffi: `'void'` as parameter type triggers internal assertion","articleBody":"### Version\n\n26.1.0\n\n### Platform\n\n```text\n\n```\n\n### Subsystem\n\nffi\n\n### What steps will reproduce the bug?\n\n```js\nconst lib = new ffi.DynamicLibrary(null);\nlib.getFunction('f', { parameters: ['void'] });\n```\n\n### How often does it reproduce? Is there a required condition?\n\nWhenever `'void'` is provided in a parameters list.\n\n### What is the expected behavior? Why is that the expected behavior?\n\nUnclear; the native `ToFFIArgument` appears to accept `void` arguments and just pass them as a pointer to 0, although I'm not sure how useful this behaviour is.\n\nEither way, `'void'` should either be accepted in a parameters list, or throw a validation error gracefully.\n\n### What do you see instead?\n\n```\nUncaught:\nError [ERR_INTERNAL_ASSERTION]: FFI: shared-buffer type table missing entry for parameter type \"void\"\nThis is caused by either a bug in Node.js or incorrect usage of Node.js internals.\nPlease open an issue with this stack trace at https://github.com/nodejs/node/issues\n\n    at wrapWithSharedBuffer (node:internal/ffi-shared-buffer:252:13)\n    at DynamicLibrary.getFunction (node:internal/ffi-shared-buffer:570:10) {\n  code: 'ERR_INTERNAL_ASSERTION'\n```\n\n### Additional information\n\ncc: @nodejs/ffi","author":{"url":"https://github.com/Renegade334","@type":"Person","name":"Renegade334"},"datePublished":"2026-05-20T18:34:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/63461/node/issues/63461"}