Build small guards. Compose them. A lightweight, zero-dependency toolkit for building reusable TypeScript type guards that compose, refine, and preserve natural narrowing. Runtime-safe 🛡️, composable 🧩, and ergonomic ✨.
Latest release v1.16.1 · 24 Oct 2026
1 file for Codex and OpenCode: is-kit AGENTS.md — 2,536 tokens loaded in every session.
AGENTS.md A 2,536 tok These files are nyaomaru/is-kit's own configuration — they tell Codex and OpenCode how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.