Jest

Pricing

• Free and open source (MIT)

Install

npm install --save-dev jest

yarn add --dev jest

pnpm add --save-dev jest

Models

Jest runs on Node. It handles TypeScript through Babel (babel-jest is installed automatically) or ts-jest. Since 30.5.2 it uses Node to strip TypeScript types when no transformer claims a file. The Jest docs say Jest is not supported by Vite and point to Vitest as the Jest-compatible alternative.

Recent changes

• Sep 18v30.5.2 strips TypeScript types with Node when no transformer claims a file. It also fixes require('../package.json') bundling, regex escaping in jest-each, and Windows source map paths.
• Sep 1v30.5.1 fixes configuration warnings for global-only options, moduleNameMapper pattern matching, and ESM package import resolution.
• Aug 28v30.5.0 adds whenCalledWith for per-argument mock return values and describe-level jest.retryTimes(). It also rewrites the non-watchman file watcher on @parcel/watcher.

Sources: Jest Getting Started, jestjs.io, GitHub releases, GitHub release v30.5.0

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