npm package
Homeis-what
is-what is a JavaScript library providing simple and small type checking functions, fully supported by TypeScript. It allows developers to easily determine the type of various JavaScript values, including primitives and complex objects, making it useful for type validation in applications.
- lurq health score
- 56/100
- Confidence
- proven
- Weekly downloads
- 13,973,846
- Latest version
- 5.5.0
- Last release
- Sep 22, 2025
- License
- MIT
Should you depend on is-what?
lurq's verdict: low
- No known advisories
Check this from your coding agent
This page is a daily snapshot. lurq's verify tool checks is-what at the exact version your agent is about to install, and compat checks it against the rest of your stack. One command connects Claude Code, Cursor, VS Code and other agents:
npx lurqrun
Free to start. Quickstart
Upgrading is-what
What each major version removed, renamed or re-signatured, from lurq's extraction of the published packages.
- 4.1.16 → 5.5.0being extracted
- 3.14.1 → 4.1.16being extracted
- 2.5.0 → 3.14.1being extracted
Scored from public signals (npm registry, GitHub, deps.dev and advisory databases). Data as of Sep 20, 2026; this page refreshes every 168 hours. Source repository.