vitest
Modern TypeScript testing with Vite-native speed, ESM-first design, and instant HMR feedback.
- Vite-powered test execution delivers 10-100x faster performance than Jest through HMR-based test running and native ES module support
- Built-in TypeScript support requires zero configuration; includes Jest-compatible API for straightforward migration from existing test suites
- Supports React and Vue component testing via Testing Library and Vue Test Utils, with jsdom/happy-dom environment options
- Comprehensive mocking API (vi.mock, vi.spyOn, vi.fn) for modules, methods, and timers; includes snapshot testing and v8-based coverage reporting
- UI mode provides visual test debugging; concurrent test execution and custom matchers enable advanced testing patterns
Vitest - Modern TypeScript Testing
Overview
Vitest is a next-generation test framework powered by Vite, designed for modern TypeScript/JavaScript projects. It provides blazing-fast test execution through HMR-based test running, native ESM support, and first-class TypeScript integration.
Key Features:
- ⚡ Vite-native: Instant HMR-based test execution (10-100x faster than Jest)
- 🎯 TypeScript-first: Built-in TypeScript support, no configuration needed
- 🔄 ESM-native: Native ES modules, async/await, top-level await
- 🧪 Jest-compatible: Compatible API for easy migration
- 📸 Snapshot testing: Built-in snapshot support
- 🎨 Component testing: React Testing Library, Vue Test Utils integration
- 📊 Coverage: Built-in v8/c8 coverage (faster than Istanbul)
- 🌐 UI mode: Beautiful web UI for test debugging
Installation:
npm install -D vitest
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