Vitest leverages Vite for fast test execution. Jest-compatible API eases migration. Native ESM support works without configuration. Watch mode re-runs affected tests instantly.
Configuration
Configure through vite.config.ts or vitest.config.ts. Share configuration with your Vite application. Set up coverage with v8 or istanbul. Configure test environment for DOM or Node.
- Use Jest-compatible assertions and mocks
- Configure coverage thresholds for CI
- Enable watch mode for rapid development
- Use workspace mode for monorepo testing
- Run benchmarks with vitest bench
Performance
Vite's transform pipeline accelerates tests. Worker threads parallelize test files. Smart watch mode minimizes re-runs. Typical projects see 2-3x speed improvement over Jest.