BDD/TDD assertion library for node.js and the browser. Test framework agnostic.

The `util.is*` functions introduced in Node v0.12.

Javascript utility for calculating deep difference, capturing changes, and applying changes across objects; for nodejs and the browser.

Deep diffs two objects, including nested structures of arrays and objects, and return the difference.

Error factory with the ability to append stack traces from previous errors, as well as appending debug params to stack traces. Great if you want one appended stack trace that defines the error at man

fs-extra contains methods that aren't included in the vanilla Node.js fs package. Such as recursive mkdir, copy, and remove.

Check if an object is contained within another one

simple, flexible, fun test framework

Support for Precondition error checking in Node.js.

Simple Statistics

JavaScript test spies, stubs and mocks.

Visual diff between javascript variables

ESLint JavaScript language implementation

Simple and complete React DOM testing utilities that encourage good testing practices.

Fire events the same way the user does

Chance - Utility library to generate anything random

A JavaScript implementation of many web standards

React is a JavaScript library for building user interfaces.

React package for working with the DOM.

Declarative routing for React

Bundle your TypeScript library with no config, powered by esbuild

TypeScript is a language for application scale JavaScript development

RFC9562 UUIDs