A tiny invariant function

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

🔥 TypeScript type assertion plugin for vitest

Playing with spok inside Cypress

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

Decorator Contracts is a library that provides the ability to create and assign Code Contracts to ECMAScript and TypeScript classes. This enables enforcement of the Liskov substitution principle and the Open-closed principle of SOLID to support Design By Contract™.

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

complex type validators that generate TypeScript and Flow types for you

Runtime type assertions that return

Simple lightweight library for enhancing plain JS objects with TypeScript wrappers enabling easy API data assertion and validation.

Runtime object parsing and validation with static TypeScript typing.

poll until an assertion succeeds

Uncommonly extensible assertions for the beautiful people

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

An extensible assertion library for JavaScript, based on Hamcrest

Assertion library for Testy.Ts

Minimal assertion library for TypeScript (and JavaScript)

A type-safe assertion library for JavaScript and TypeScript.

Santi's Assertion Library. Official repo for NPM package @santi100a/assertion-lib.

A TypeScript library that provides borrowing mechanisms via assertion functions