Node.js "fs" and browser "File System API" adapters and in-memory implementations 👍

Configurable mock for the fs module

Jest support for mock argument-matched return values.

Validate and visualize dependencies. Your rules. JavaScript, TypeScript, CoffeeScript. ES6, CommonJS, AMD.

Create graphs from your CommonJS, AMD or ES6 module dependencies

Easy auditing & sandboxing for your JavaScript dependencies 🪱

JSON storage bins with schema validation

Fake HTTP injection library

Starts server, waits for URL, then runs test command; when the tests end, shuts down server

A framework for finding JavaScript memory leaks and analyzing heap snapshots

A tool for finding memory leaks in web apps

🔥 single-command flamegraph profiling 🔥

Clinic.js diagnoses your Node.js performance issues

🌌 Collection of articles and tools to efficiently profile Node.js

A tapable integration testing library for your Storybook stories

Check the browser compatibility of your code

A plugin that helps you to enforce hexagonal architecture best practises

Additional ESLint rules for directive comments of ESLint.

ESLint rule that forces you to write good comments

Require `throw new Error()` and not `throw Error()`

Measure the churn/complexity ratio. Higher values indicate hotspots where refactorings should happen.

⏱️ Investigates v8/Node.js function deoptimizations.

wait-on is a cross-platform command line utility and Node.js API which will wait for files, ports, sockets, and http(s) resources to become available

Additional Jest matchers 🃏💪

✨ JSON schema matcher for Jest

This tool will take a js/ts file as input and generate a jest unit test file next to it with all imports mocked and tests stubs for every class method and function exported.

Light weight cross-platform test automation

A node.js library for testing modern web applications

Property based testing framework for JavaScript (like QuickCheck) written in TypeScript