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unknown type is unknown.
So, if you want to use correctly, you should do type narrowing.
Then, you can use is-kit.
nyaomaru | Game Developer
@nyaomaru_dev
Funny frontend engineer (React / Vue / TypeScript)
I made a tiny game about running away from work
👇Let's Play
nyaomaru-portfolio.vercel.app/game
- is-kit reached 50 GitHub stars! 🎉😸 More importantly, it's now being used in a production TypeScript app serving 100,000+ users. I wrote about how we introduced it, what changed, and where it actually helps.👇
- We introduced `is-kit` into a production TypeScript app serving 100,000+ users. 🚀 One refactor: - 7 error guard modules → 1 - 584 lines removed - 249 fewer lines overall More details soon. 😸
- `is-kit` is built around a simple idea 👇 Build small type guards. Compose them. 😸 Small predicates are easier to reuse across `if`, `filter`, error handling, and more.
- Instead of repeatedly writing 👇 isString(value) || isNumber(value) is-kit lets you create a reusable guard 👇 const isTextOrNumber = or(isString, isNumber) Small difference, but the guard can be named, reused, passed to filter, and composed again. 🧩
