Vitest

Vitest is the next-generation testing framework: Vite-native, blazing fast, and Jest-compatible.

Vitest is a high-performance test runner built on Vite, designed for modern JavaScript and TypeScript projects. It leverages Vite’s configuration and transformation pipeline, ensuring a consistent setup across your application and tests. Expect a significant boost in Developer Experience (DX) with its smart, instant watch mode, which reruns only related changes, similar to Hot Module Replacement (HMR). Vitest maintains a Jest-compatible API (including `expect`, snapshot testing, and mocking via Tinyspy), making migration from existing test suites straightforward. It provides out-of-the-box support for ESM, TypeScript, and JSX, and is the recommended solution for component testing in frameworks like Vue, React, and Svelte.

https://vitest.dev