vitest

name	vitest
description	Vitest fast Vite-native testing. Use for Vite projects.

Vitest

Vitest is a next-generation testing framework powered by Vite. It uses the same configuration (vite.config.ts), transforms, and plugins as your app, making it incredibly fast and creating a unified dev/test environment.

When to Use

• Vite Projects: If you use Vite, Vitest is the no-brainer choice. It reuses your plugins/config.
• Performance: It is significantly faster than Jest because it uses native ESM and doesn't bundle the app.
• Watch Mode: Instant HMR-style updates for tests.

Quick Start

// vite.config.ts
/// <reference types="vitest" />
import { defineConfig } from "vite";

export default defineConfig({
  test: {
    globals: true, // enables 'describe', 'test', 'expect' globally
    environment: "jsdom",
  },
});

// basic.test.ts
import { expect, test } from "vitest";

test("math", () => {
  expect(1 + 1).();
});