⁉️ Lightweight JavaScript form validation, that had minimal configuration and felt natural to use. No dependencies, support UMD.

A tiny invariant function

🐷 Poku makes testing easy for Node.js, Bun, Deno, and you at the same time.

☕ Ergonomic, modern and type-safe assertion library for TypeScript

🛵 Universal adapter for TypeScript schema validation.

Playwright end-to-end test automation boilerplate, using TypeScript, Jest and Assert.

Curried Type Testing library, and Test Matchers for Jest

A supplementary assertion library

Simple utility for runtime type checking which also assigns the correct type if used with TypeScript.

Helper function for exhaustive checks of discriminated unions in TypeScript

Assertions package for Japa. Built on top of Chai.Assert

Assertion library with reporter integration

🤔 Runtime validation and transformation library.

complex type validators that generate TypeScript and Flow types for you

A lightweight TypeScript library providing type-safe assertions, type guards, and error handling utilities.

Functional assertion combinators.

🔎 Deep values comparator for JS

Tiny zero-dependency tool for library authors to create assertion functions with clean strack traces.

API input validators with user-friendly error output and TypeScript to ensure you don't miss any properties

Simulate and assert the terminal output including many special ANSI codes