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Show HN: Is-Kit – Lightweight TypeScript Guard and Validator Toolkit

https://github.com/nyaomaru/is-kit
1•nyaomaru•1h ago
Hi HN, I built is-kit, a lightweight, zero-dependency toolkit for TypeScript type guards and composable validators.

I made this because I was tired of writing repetitive value is Foo guards and wanted a clean, type-safe alternative.

GitHub: https://github.com/nyaomaru/is-kit Docs: https://is-kit-docs.vercel.app/en

Would love your feedback on design trade-offs and naming!

Comments

nyaomaru•1h ago
Hey everyone! I built this after years of copy pasting type guards across projects. The design tries to find a middle ground between runtime validation (like zod) and ergonomic type guards.

I'm especially curious if the “composability” part feels natural — e.g. combining guards with `and`, `or`, `struct`.

Also open to any feedback about naming and developer ergonomics!

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