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Vitest — fast testing that reuses the Vite transform and configuration stack

OSS scale score 287.4OSS health 100Update pace 90 commits/30d
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Stars
17,128
Primary language
TypeScript
License
MIT
Repository last updated
Sep 20, 2026

Overview

Vitest is a JavaScript and TypeScript testing framework that reuses Vite configuration, transforms, resolvers, and plugins. It combines Jest-compatible expect and mocking APIs with snapshots, watch mode, V8/Istanbul coverage, Browser Mode, and component testing.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Reuse the Vite configuration and transform pipeline

Tests can use the same Vite plugins, TypeScript/JSX transforms, and configuration as the application, reducing duplicate test-build setup.

Sources: [2][4]

Cover unit, snapshot, browser, and component testing

Vitest includes Jest-compatible assertions and mocks, snapshots, coverage, Browser Mode, and component-testing support for common frontend frameworks.

Sources: [2]

For fast feedback in Vite-based frontends and TypeScript packages

Vitest suits projects that want fast watch-mode feedback and a common toolchain spanning unit through browser/component tests.

Sources: [2][4]

Check Node/Vite versions and the exact Jest compatibility surface

The README requires Vite 6.4.0+ and Node 22.12.0+. Its Jest compatibility is broad but not a complete drop-in guarantee, so migration should validate environment and API differences.

Sources: [2][4]

Official sources

  1. [1]vitest-dev/vitest repository(2026-09-20)
  2. [2]Vitest README(2026-09-20)
  3. [3]Vitest MIT license(2026-09-20)
  4. [4]Vitest documentation(2026-09-20)
Supplemental curator note

Vitest is particularly convenient in Vite projects because tests can reuse the application's transforms, configuration, and plugins instead of maintaining a separate test compilation stack. The current README requires Vite 6.4.0+ and Node 22.12.0+, so verify runtime versions before adoption.

Try it in 3 steps

  1. 1

    Install Vitest in a minimal project

    Use a disposable project with Node 22.12.0+ and add Vitest as a dev dependency.

    mkdir vitest-demo && cd vitest-demo && npm init -y && npm install -D vitest
  2. 2

    Create one test file

    Create a minimal unit test using the Vitest test and expect APIs.

    printf "import { expect, test } from 'vitest'\ntest('adds', () => expect(1 + 1).toBe(2))\n" > sum.test.js
  3. 3

    Run the test once

    Use a single run first to verify test discovery and execution.

    npx vitest run
Check the official README

Growth

Growth trends · Last 30 days

17,128 Stars

Trend data is still being collected.

Development activity

Last 90 days · weekly

Commits (last 30 days)
90
Open PRs
82
Issues opened
154
Issues closed
133
PRs opened
487
PRs merged
320

Issues

154 / 133

Jun 23Sep 20
Issues openedIssues closed

Pull requests

487 / 320

Jun 23Sep 20
PRs openedPRs merged

Maintenance

Median first response
9.2 hr
Issue response rate
48.4% (46/95)

Based on up to the 100 newest issues opened by external users in the last 90 days. A first comment from an OWNER, MEMBER, or COLLABORATOR counts as a response; issues whose full comment history cannot be checked are excluded. The median and response rate update weekly.

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GitHub data

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GitHub Topics

  • vite
  • test
  • testing-tools
Stars
17,128
Forks
2,011
Watchers
64
Open issues
342
Contributors
460
Primary language
TypeScript
License
MIT
Repository last updated
Sep 20, 2026
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