Vitest

Built for Vite projects, this brings Jest's familiar API with faster execution through native ESM support. You get describe/it blocks, vi.mock for module mocking, and parallel test running out of the box. The skill breaks down into five focused references: config for vitest.config.ts setup, test-api for writing suites and hooks, mocking for vi.fn and spies, utilities for assertions and coverage, and advanced for environments and type testing. If you're already using Vite, this is the natural choice since it shares the same config and transform pipeline. Load references selectively based on your task rather than dumping everything into context.

Install to Claude Code

npx -y skills add onmax/nuxt-skills --skill vitest --agent claude-code