Jest · Delightful JavaScript Testing Jest is a delightful JavaScript Testing Framework with a focus on simplicity It works with projects using: Babel, TypeScript, Node, React, Angular, Vue and more! Zero config Jest aims to work out of the box, config free, on most JavaScript projects
Getting Started - Jest Using Parcel Jest can be used in projects that use parcel-bundler to manage assets, styles, and compilation similar to webpack Parcel requires zero configuration Refer to the official docs to get started Using TypeScript Via babel Jest supports TypeScript, via Babel First, make sure you followed the instructions on using Babel above
Globals - Jest In your test files, Jest puts each of these methods and objects into the global environment You don't have to require or import anything to use them However, if you prefer explicit imports, you can do import {describe, expect, test} from '@jest globals'
Need help? - Jest Need help? Jest is worked on by a team of volunteers in their spare time You can find out ways to talk to community members below
Jest 30: Faster, Leaner, Better · Jest - jestjs. io Jest is fast, but due to Jest's test isolation, slow user code often exacerbates performance issues and leads to slow test runs When tests leave behind open handles like unclosed timers or connections to other services, it can cause Jest to hang or slow down Jest 30 has gotten better at detecting and reporting these issues, which helps you identify and fix slow or problematic tests more
Empezando - Jest Using Parcel Jest can be used in projects that use parcel-bundler to manage assets, styles, and compilation similar to webpack webpack ofrece desafíos únicos por sobre otras herramientas Refer to the official docs to get started Usando TypeScript Via babel Jest soporta TypeScript, a través de Babel
Testing Web Frameworks · Jest Jest is a universal testing platform, with the ability to adapt to any JavaScript library or framework In this section, we'd like to link to community posts and articles about integrating Jest into popular JS libraries