Write and configure unit tests, which check individual pieces of code, using Vitest. Replace dependencies with test substitutes, measure code coverage, compare saved outputs, and organize filtered or parallel test runs.
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Vitest fast unit testing framework powered by Vite with Jest-compatible API. Use when writing tests, mocking, configuring coverage, or working with test filtering and fixtures.
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Vitest is a next-generation testing framework powered by Vite. It provides a Jest-compatible API with native ESM, TypeScript, and JSX support out of the box. Vitest shares the same config, transformers, resolvers, and plugins with your Vite app.
Key Features:
The skill is based on Vitest 5.0.1, generated at 2026-09-25.
| Topic | Description | Reference |
|---|---|---|
| Configuration | Vitest and Vite config integration, defineConfig usage | core-config |
| CLI | Command line interface, commands and options | core-cli |
| Test API | test/it function, modifiers like skip, only, concurrent | core-test-api |
| Describe API | describe/suite for grouping tests and nested suites | core-describe |
| Expect API | Assertions with toBe, toEqual, matchers and asymmetric matchers | core-expect |
| Hooks | beforeEach, afterEach, beforeAll, afterAll, aroundEach | core-hooks |
| Topic | Description | Reference |
|---|---|---|
| Mocking | Mock functions, modules, timers, dates with vi utilities | features-mocking |
| Snapshots | Snapshot testing with toMatchSnapshot and inline snapshots | features-snapshots |
| Coverage | Code coverage with V8 or Istanbul providers | features-coverage |
| Test Context | Test fixtures, context.expect, test.extend for custom fixtures | features-context |
| Concurrency | Concurrent tests, parallel execution, sharding | features-concurrency |
| Filtering | Filter tests by name, file patterns, tags | features-filtering |
| Test Tags | Label tests with tags to filter runs and apply shared options | features-test-tags |
| Reporters | Built-in reporters, default selection, CI/output config | features-reporters |
| Benchmarking | Write benchmarks with the bench fixture (Tinybench) | features-benchmarking |
| Topic | Description | Reference |
|---|---|---|
| Vi Utilities | vi helper: mock, spyOn, fake timers, hoisted, waitFor | advanced-vi |
| Environments | Test environments: node, jsdom, happy-dom, custom | advanced-environments |
| Type Testing | Type-level testing with expectTypeOf and assertType | advanced-type-testing |
| Projects | Multi-project workspaces, different configs per project | advanced-projects |
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Set up JavaScript and TypeScript projects using Anthony Fu’s conventions for code organization, development tools, and package publishing. Establish shared checks for formatting, types, unused code, and tests before committing changes.
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Create a GitHub pull request from the current branch with a structured title, a clear explanation of behavior changes, and recorded check results. For UI changes, attach before-and-after screenshots so reviewers can assess the visual differences.
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Build and configure web servers with Nitro, including request handlers, caching, storage, and scheduled tasks. The skill also guides deployment to supported runtimes and platforms, plus migration from Nitro v2 to v3.
한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.
Develop Vue web applications with Nuxt, covering pages, data fetching, shared state, and server API routes. Configure rendering on the server or in the browser, and prepare deployment settings for supported platforms.
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Organize shared data and update logic in Vue apps using Pinia stores, containers for application state. The skill guides store definitions, reactive data access, communication between stores, testing, and integration with Nuxt and server-side rendering.
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Manage Node.js dependencies with pnpm, from installing packages to coordinating multiple projects in one workspace. The skill covers shared version settings, third-party package patches, dependency overrides, and consistent installation procedures for automated build environments.
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