Vitest

Vitest is a unit testing framework built on Vite. It reuses your Vite configuration — including plugins, aliases and environment — so tests run in the same conditions as your app.

Key Features

• Vite-native: same config, plugins and transforms as your app.
• Instant HMR for fast watch-mode feedback.
• ESM, TypeScript and JSX out of the box.
• Snapshot, mock and coverage tooling built in.
• Worker-based parallelism across CPU cores.
• Vitest Browser Mode for real-browser tests.

Pricing

Vitest is free and open source under the MIT license.

Getting Started

npm install -D vitest

import { describe, it, expect } from 'vitest';

it('adds numbers', () => expect(1 + 1).toBe(2));

Run npx vitest in watch mode or npx vitest run for CI.