Vitest

Vitest brings Vite's speed philosophy to testing. Native ESM, instant hot module replacement for tests, and Jest compatibility mean you get modern infrastructure without relearning testing patterns.

Key Features:

• Vite Powered - Instant test startup and HMR
• Jest Compatible - Familiar API, easy migration
• TypeScript Native - No configuration needed
• ESM First - Modern module support out of the box

Why Vitest:

• Speed - Dramatically faster than Jest for most projects
• Developer Experience - Tests re-run instantly on change
• Configuration - Shares Vite config, less setup
• Watch Mode - Interactive test filtering and rerunning

Vitest capabilities:

• Snapshot Testing - Jest-compatible snapshots
• Mocking - Comprehensive mocking utilities
• Coverage - Built-in code coverage
• UI Mode - Visual test explorer

Vitest is the default choice for Vite-based projects and increasingly for any modern frontend project. The speed improvement over Jest is substantial, and the compatibility means migration is straightforward.