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Vitest

Checked
antfu·vlatest·testing·MIT

Automates JavaScript unit tests using Vitest, streamlining development workflows and ensuring code quality.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add antfu/skills --skill vitest -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

antfu

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned antfu/skills at d02c48452d.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
d02c48452d
Manifest
skills/vitest/SKILL.md
Scanned
21 files, 3,921 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

The vitest skill enables fast and efficient unit testing in JavaScript projects. It supports a wide range of test frameworks, including Jest and Mocha, and provides features like snapshot testing, mocking, and parallel execution to streamline the testing process.

When to use it

  • You need to run unit tests for a JavaScript or TypeScript project quickly.
  • You want to implement snapshot testing to ensure UI components remain consistent across updates.
  • Your project requires mocking external APIs or dependencies during testing.
  • You're looking to improve test performance by running tests in parallel.

Key capabilities

  • Supports multiple testing frameworks (Jest, Mocha, etc.)
  • Snapshot testing for component consistency
  • Mocking of APIs and dependencies
  • Parallel test execution for faster results

Example prompts

  • "Run all unit tests using vitest with Jest framework."
  • "Set up snapshot testing for the components in my React project."
  • "Mock the API call to 'https://api.example.com/data' during testing."

Tips & gotchas

  • Ensure your project has a compatible test runner (e.g., Jest) installed before using vitest.
  • Snapshot tests may require manual review after significant UI changes to avoid false positives.