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Find and fix problems in your JavaScript code.

Prettier is an opinionated code formatter.

☕️ simple, flexible, fun javascript test framework for node.js & the browser

Node.js API for Chrome

A modern JavaScript utility library delivering modularity, performance, & extras.

🐠 Babel is a compiler for writing next generation JavaScript.

A `rm -rf` util for nodejs

🔀 Cross platform setting of environment scripts

ESLint plugin with rules that help validate proper imports.

A reference implementation of GraphQL for JavaScript

The reference implementation of Sass, written in Dart.

Git hooks made easy 🐶 woof!

A bundler for javascript and friends. Packs many modules into a few bundled assets. Code Splitting allows for loading parts of the application on demand. Through "loaders", modules can be CommonJs, AMD, ES6 modules, CSS, Images, JSON, Coffeescript, LESS, ... and your custom stuff.

Turns off all rules that are unnecessary or might conflict with Prettier.

BDD / TDD assertion framework for node.js and the browser that can be paired with any testing framework.

the Istanbul command line interface

The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.

Test spies, stubs and mocks for JavaScript.

Async utilities for node and the browser

TypeScript execution and REPL for node.js

Fast, unopinionated, minimalist web framework for node.

React-specific linting rules for ESLint

Bootstrap components built with React

A Jest transformer with source map support that lets you use Jest to test projects written in TypeScript.

🖍 Terminal string styling done right

glob functionality for node.js

Additional ESLint's rules for Node.js

A CLI tool to run multiple npm-scripts in parallel or sequential.

JavaScript YAML parser and dumper. Very fast.

Temporary file and directory creator for node.js

Standard Library

📦 Babel loader for webpack

Loads environment variables from .env for nodejs projects.

A light-weight module that brings the Fetch API to Node.js

yargs the modern, pirate-themed successor to optimist.

Serves a webpack app. Updates the browser on changes. Documentation

🍣 The one-stop shop for official Rollup plugins

Rollup plugin to minify generated bundle

tokyo_tower A wrapper for Babel's parser used for ESLint (renamed to @babel/eslint-parser)

HTTP server mocking and expectations library for Node.js

A benchmarking library. As used on

An extremely fast bundler for the web

A simple, yet elegant, HTTP library.

process information for node.js and browsers

a glob matcher in javascript

A simple javascript utility for conditionally joining classNames together

The semver parser for node (the one npm uses)

🚫💩 — Run linters on git staged files

The library for web and native user interfaces

A JavaScript Mock Date object that can be used to change when "now" is.

Recursively mkdir, like `mkdir -p`, but in node.js

A small, fast, JavaScript-based JavaScript parser

Spectacular Test Runner for JavaScript

Sinon for karma

Chai for Karma

Delete files and directories

The pytest framework makes it easy to write small tests, yet scales to support complex functional testing

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

An identity object using ES6 proxies. Useful for mocking webpack imports like CSS Modules.

Run your tests using Jest & Puppeteer 🎪✨

Python HTTP library with thread-safe connection pooling, file post support, user friendly, and more.

Global coverage report uploader for Codecov in NodeJS

Easy autofixable import sorting.

Adds source map support to node.js (for stack traces)

The code coverage tool for Python

Python static typing home. Hosts the documentation and a user help forum.

Write minimal node index.js files that require and export siblings by file basename

JavaScript library of crypto standards.

The modern, lightweight, performant, accessible and extensible drag & drop toolkit for React.

flake8 is a python tool that glues together pycodestyle, pyflakes, mccabe, and third-party plugins to check the style and quality of some python code.

Javascript Matrix and Vector library for High Performance WebGL apps

A fast, simple & universal Least Recently Used (LRU) map for JavaScript

Spinning up mongod in memory for fast tests. If you run tests in parallel this lib helps to spin up dedicated mongodb servers for every test file in MacOS, *nix, Windows or CI environments (in most cases with zero-config).

Turns off all rules that are unnecessary or might conflict with prettier.

Collection of library stubs for Python, with static types

Coverage plugin for pytest.

A tiny JavaScript debugging utility modelled after Node.js core's debugging technique. Works in Node.js and web browsers

Pytest support for asyncio.

Http server for pytest to test http clients

owl Custom jest matchers to test the state of the DOM

A Karma plugin. Launcher for Chrome and Chrome Canary.

❤️ JavaScript/TypeScript linter (ESLint wrapper) with great defaults

🔮 An easy-to-use JavaScript unit testing framework.

Jest mock for fetch

Optional static typing for Python

A Karma plugin. Adapter for Mocha testing framework.

A cross-browser, numerically stable algorithm that adds floats accurately in Javascript

Write Gatsby redirects to html files with a meta refresh

Sentry performance instrumentation for jest

A JavaScript implementation of various web standards, for use with Node.js

React components for Chart.js, the most popular charting library

Monitor for any changes in your node.js application and automatically restart the server - perfect for development