antfu - SKILL.md Agent Skill

name: antfu description: Anthony Fu's opinionated tooling and conventions for JavaScript/TypeScript projects. Use when setting up new projects, configuring ESLint/Prettier alternatives, monorepos, library publishing, or when the user mentions Anthony Fu's preferences. metadata: author: Anthony Fu version: "2026.1.28"

Anthony Fu's Preferences

Category	Preference
Package Manager	pnpm (with `@antfu/ni` for unified commands)
Language	TypeScript (strict mode, ESM only)
Linting & Formatting	`@antfu/eslint-config` (no Prettier)
Testing	Vitest
Git Hooks	simple-git-hooks + lint-staged
Bundler (Libraries)	tsdown
Documentation	VitePress

Core Conventions

@antfu/ni Commands

Command	Description
`ni`	Install dependencies
`ni <pkg>` / `ni -D <pkg>`	Add dependency / dev dependency
`nr <script>`	Run script
`nu`	Upgrade dependencies
`nun <pkg>`	Uninstall dependency
`nci`	Clean install (`pnpm i --frozen-lockfile`)
`nlx <pkg>`	Execute package (`npx`)

TypeScript Config

{
  "compilerOptions": {
    "target": "ESNext",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true
  }
}

ESLint Setup

// eslint.config.mjs
import antfu from '@antfu/eslint-config'

export default antfu()

Fix linting errors with nr lint --fix. Do NOT add a separate lint:fix script.

For detailed configuration options: antfu-eslint-config

Git Hooks

{
  "simple-git-hooks": {
    "pre-commit": "pnpm i --frozen-lockfile --ignore-scripts --offline && npx lint-staged"
  },
  "lint-staged": { "*": "eslint --fix" },
  "scripts": { "prepare": "npx simple-git-hooks" }
}

Vitest Conventions

Test files: foo.ts → foo.test.ts (same directory)
Use describe/it API (not test)
Use toMatchSnapshot for complex outputs
Use toMatchFileSnapshot with explicit path for language-specific snapshots

pnpm Catalogs

Use named catalogs in pnpm-workspace.yaml for version management:

Catalog	Purpose
`prod`	Production dependencies
`inlined`	Bundler-inlined dependencies
`dev`	Dev tools (linter, bundler, testing)
`frontend`	Frontend libraries

Avoid the default catalog. Catalog names can be adjusted per project needs.

References

Topic	Description	Reference
ESLint Config	Framework support, formatters, rule overrides, VS Code settings	antfu-eslint-config
Project Setup	.gitignore, GitHub Actions, VS Code extensions	setting-up
App Development	Vue/Nuxt/UnoCSS conventions and patterns	app-development
Library Development	tsdown bundling, pure ESM publishing	library-development
Monorepo	pnpm workspaces, centralized alias, Turborepo	monorepo