Individual skill

vitest

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.

skills/vitest/SKILL.md

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Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 6,060
Repository last updated: Nov 5, 2026
License: MIT

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GENERATION.mddoc · 136 bytes
SKILL.mdcore · 3,716 bytes
references/advanced-environments.mddoc · 5,005 bytes
references/advanced-projects.mddoc · 7,529 bytes
references/advanced-type-testing.mddoc · 4,740 bytes
references/advanced-vi.mddoc · 5,933 bytes
references/core-cli.mddoc · 5,055 bytes
references/core-config.mddoc · 7,878 bytes
references/core-describe.mddoc · 3,624 bytes
references/core-expect.mddoc · 9,001 bytes
references/core-hooks.mddoc · 4,891 bytes
references/core-test-api.mddoc · 5,662 bytes
references/features-benchmarking.mddoc · 3,992 bytes
references/features-concurrency.mddoc · 4,805 bytes
references/features-context.mddoc · 5,414 bytes
references/features-coverage.mddoc · 5,120 bytes
references/features-filtering.mddoc · 4,931 bytes
references/features-mocking.mddoc · 10,064 bytes
references/features-reporters.mddoc · 4,114 bytes
references/features-snapshots.mddoc · 5,291 bytes
references/features-test-tags.mddoc · 3,693 bytes

Read excerpt


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:**
- Vite-native: Uses Vite's transformation pipeline for fast HMR-like test updates
- Jest-compatible: Drop-in replacement for most Jest test suites
- Smart watch mode: Only reruns affected tests based on module graph
- Native ESM, TypeScript, JSX support without configuration
- Multi-threaded workers for parallel test execution
- Built-in coverage via V8 or Istanbul
- Snapshot testing, mocking, and spy utilities

> The skill is based on Vitest 5.1.0-beta.1, generated at 2026-10-23.

## Core