JavaScript/TypeScript linter (ESLint wrapper) with great defaults

Fake JavaScript timers

Prettier is an opinionated code formatter

Rollup plugin to minify generated bundle

Functional approach to compose your webpack config.

Utilities for testing Ink apps

Delightful JavaScript Testing.

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

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

Yet another JS code coverage tool that computes statement, line, function and branch coverage with module loader hooks to transparently add coverage when running tests. Supports all JS coverage use cases including unit tests, server side functional tests

Sinon.JS assertions for referee

Full featured Promises/A+ implementation with exceptionally good performance

Seamless integration between Rollup and Istanbul.