Today we are happy to announce the release of Jest 30. This release features a substantial number of changes, fixes, and improvements. While it is one of the largest major releases of Jest ever, we admit that three years for a major release is too long. In the future, we are aiming to make more frequent major releases to keep Jest great for the next decade.

Jest is a JavaScript testing framework developed by Facebook, designed to simplify the process of writing and running tests for JavaScript applications, particularly those built with React. With features such as snapshot testing, mocking, and code coverage reporting, Jest enables developers to write  and reliable tests for their JavaScript codebases. Developers can learn how to use Jest to write effective unit tests, integration tests, and end-to-end tests for their applications, ensuring code quality and stability throughout the development lifecycle.

Jest

Jest 30 has been released with significant performance improvements, reduced memory usage, and new features. Key changes include dropping support for older Node.js versions, upgrading to jsdom 26, requiring TypeScript 5.4+, and introducing new APIs like expect.arrayOf and jest.advanceTimersToNextFrame(). The release delivers up to 37% faster test runs and 77% lower memory usage in some cases, along with better ECMAScript module support, configurable test retries, and improved globals cleanup between test files.

Jest 30: Faster, Leaner, Better · Jest