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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


The repository for high quality TypeScript type definitions.


🐠 Babel is a compiler for writing next generation JavaScript.


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


Headless Chrome Node.js API


A `rm -rf` util for nodejs


🔀 Cross platform setting of environment scripts


ESLint plugin with rules that help validate proper imports.


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


Next-generation ES module bundler


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


A reference implementation of GraphQL for JavaScript


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.


Git hooks made easy 🐶 woof!


sparkles Monorepo for all the tooling which enables ESLint to support TypeScript


Test spies, stubs and mocks for JavaScript.


the Istanbul command line interface


Async utilities for node and the browser


The reference implementation of Sass, written in Dart.


Additional ESLint's rules for Node.js


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


glob functionality for node.js


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


React-specific linting rules for ESLint


Webpack's Command Line Interface


TypeScript execution and REPL for node.js


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


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


🖍 Terminal string styling done right


Rollup plugin to minify generated bundle


Fast, unopinionated, minimalist web framework for node.


Temporary file and directory creator for node.js


Standard Library


🍣 The one-stop shop for official Rollup plugins


An extremely fast JavaScript and CSS bundler and minifier


Bootstrap components built with React


📦 Babel loader for webpack


A small, fast, JavaScript-based JavaScript parser


A benchmarking library. As used on jsPerf.com.


A simple, yet elegant, HTTP library.


Loads environment variables from .env for nodejs projects.


Chai for Karma


Sinon for karma


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


yargs the modern, pirate-themed successor to optimist.


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


The semver parser for node (the one npm uses)


Run your tests using Jest & Puppeteer 🎪✨


Easy autofixable import sorting.


Serves a webpack app. Updates the browser on changes. Documentation https://webpack.js.org/configuration/dev-server/.


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


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


JavaScript YAML parser and dumper. Very fast.


Spectacular Test Runner for JavaScript


Coverage plugin for pytest.


Pytest support for asyncio.


Http server for pytest to test http clients


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


HTTP server mocking and expectations library for Node.js


process information for node.js and browsers


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


A simple javascript utility for conditionally joining classNames together


Optional static typing for Python


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


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


🌍  Spec-compliant and production ready JavaScript GraphQL server that lets you develop in a schema-first way. Built for Express, Connect, Hapi, Koa, and more.


Global coverage report uploader for Codecov in NodeJS


Detect if the current environment is a CI server


Ember CLI plugin that injects live-reload script into HTML content


dragon Lerna is a fast, modern build system for managing and publishing multiple JavaScript/TypeScript packages from the same repository.


Signs and prepares Node.js requests using AWS Signature Version 4


Copy text to the clipboard in modern browsers (0.2 kB)


v A high level git url parser for common git providers.


Gettext Style i18n for Modern JavaScript Apps


Utility to make jest tests fail when console.error() or any other methods are used


🚫💩 — Run linters on git staged files


🤖 Powerful asynchronous state management, server-state utilities and data fetching for TS/JS, React, Solid, Svelte and Vue.


Remark plugins for Markbook


Simple wrapper for cross-browser usage of the JavaScript Fullscreen API


Smooth scrolling to an element via selector or node reference


A Karma plugin. Launcher for Chrome and Chrome Canary.


The PHP Interpreter