Vitest is a Vite-native test framework designed for fast and integrated JavaScript and TypeScript testing. It runs tests with near-native speed by leveraging the Vite ecosystem, offering fast hot module replacement and smart caching. The API resembles popular testing frameworks, enabling easy adoption, with built-in assertions, mocks, spies, snapshots, and parallel test execution. It provides first-class TypeScript support, zero-config options, and seamless integration with Vite projects, plus a compatibility layer for Jest-like syntax and workflows when needed. Coverage reporting, rich diagnostics, and a flexible configuration system help tailor test runs for development, CI, and production environments.

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Vitest

Fast, lightweight unit testing for JavaScript/TypeScript with Vite.

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