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 …

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 …

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 …

Jun 4, 2025 · Jest 30 delivers real-world performance gains thanks to many optimizations, especially related to module resolution, memory usage, and test isolation. By relying on the new unrs-resolver, …

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 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.

Using webpack Jest can be used in projects that use webpack to manage assets, styles, and compilation. webpack does offer some unique challenges over other tools. Refer to the webpack …

At Facebook, we use Jest to test React applications.

Jest Platform You can cherry pick specific features of Jest and use them as standalone packages. Here's a list of the available packages: jest-changed-files Tool for identifying modified files in a git/hg …

Jest CLI Options The jest command line runner has a number of useful options. You can run jest --help to view all available options. Many of the options shown below can also be used together to run tests …