Graveyard Check — find maintained successors for abandoned dependencies

SwaggerJS - a collection of interfaces for OAI specs

type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.

Error comparison and information related utility for node and the browser

Parses and compiles CSS nth-checks to highly optimized functions.

Property based testing framework for JavaScript (like QuickCheck)

Check if a path is a file, directory, or symlink

@firebase/app-check-interop-types Types

The App Check component of the Firebase JS SDK

A compat App Check package for new firebase packages

@firebase/app-check Types

More powerful alternative to Animated library for React Native.

Large collection of predicates.

Check the engines and platform fields in package.json

Audit which Claude Code skills you actually use — surface dead installs and hallucinated invocations from your session logs.

Check which JavaScript environment your code is running in at runtime: browser, Node.js, Bun, etc

A little library for asserting types and values, with zero dependencies.

PostHog Node.js integration

JS type check (TypeScript supported) functions like `isPlainObject() isArray()` etc. A simple & small integration.

Light multi-platform disk space checker without third party for Node.js