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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.

🔀 Cross platform setting of environment scripts

The reference implementation of Sass, written in Dart.

A reference implementation of GraphQL for JavaScript

Git hooks made easy 🐶 woof!

ESLint plugin with rules that help validate proper imports.

the Istanbul command line interface

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

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

Test spies, stubs and mocks for JavaScript.

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

TypeScript execution and REPL for node.js

Async utilities for node and the browser

Fast, unopinionated, minimalist web framework for node.

Webpack's Command Line Interface

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

React-specific linting rules for ESLint

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

JavaScript YAML parser and dumper. Very fast.

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

Additional ESLint's rules for Node.js

Temporary file and directory creator for node.js

yargs the modern, pirate-themed successor to optimist.

Standard Library

📦 Babel loader for webpack

a glob matcher in javascript

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

Delete files and directories

HTTP server mocking and expectations library for Node.js

An extremely fast bundler for the web

Rollup plugin to minify generated bundle

process information for node.js and browsers

A benchmarking library. As used on

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

🚫💩 — Run linters on git staged files

A simple javascript utility for conditionally joining classNames together

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

Transforming styles with JS plugins

A simple, yet elegant, HTTP library.

The semver parser for node (the one npm uses)

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

Spectacular Test Runner for JavaScript

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

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

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

A small, fast, JavaScript-based JavaScript parser

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

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

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

Global coverage report uploader for Codecov in NodeJS

Sinon for karma

Chai for Karma

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

Shared TypeScript config for my projects

Node.js test runner that lets you develop with confidence 🚀

Jest mock for fetch

Parse CSS and add vendor prefixes to rules by Can I Use

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

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

A task runner / simpler Make alternative written in Go

A Karma plugin. Launcher for Chrome and Chrome Canary.

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

Run your tests using Jest & Puppeteer 🎪✨

Easy autofixable import sorting.

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

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

A Karma plugin. Adapter for Mocha testing framework.

JavaScript library of crypto standards.

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).

Coverage plugin for pytest.

Collection of library stubs for Python, with static types

A mighty CSS linter that helps you avoid errors and enforce conventions.

Pytest support for asyncio.