Agent Skills: Anthony Fu's Preferences

Anthony Fu's Preferences

This skill covers Anthony Fu's preferred tooling, configurations, and best practices for web development. This skill is opinionated.

Quick Summary

| Category | Preference | |----------|------------| | Package Manager | pnpm | | Language | TypeScript (strict mode) | | Module System | ESM ("type": "module") | | Linting & Formatting | @antfu/eslint-config (no Prettier) | | Testing | Vitest | | Git Hooks | simple-git-hooks + lint-staged | | Documentation | VitePress (in docs/) |

Core Stack

Package Manager (pnpm)

Use pnpm as the package manager.

For monorepo setups, use pnpm workspaces:

# pnpm-workspace.yaml
packages:
  - 'packages/*'

Use pnpm named catalogs in pnpm-workspace.yaml to manage dependency versions:

| Catalog | Purpose | |---------|---------| | prod | Production dependencies | | inlined | Dependencies inlined by bundler | | dev | Development tools (linter, bundler, testing, dev-server) | | frontend | Frontend libraries bundled into frontend |

Catalog names are not limited to the above and can be adjusted based on needs. Avoid using default catalog.

@antfu/ni

Use @antfu/ni for unified package manager commands. It auto-detects the package manager (pnpm/npm/yarn/bun) based on lockfile.

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

Install globally with pnpm i -g @antfu/ni if the commands are not found.

TypeScript (Strict Mode)

Always use TypeScript with strict mode enabled.

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

ESM (ECMAScript Modules)

Always work in ESM mode. Set "type": "module" in package.json.

Code Quality

ESLint (@antfu/eslint-config)

Use @antfu/eslint-config for both formatting and linting. This eliminates the need for Prettier.

Create eslint.config.js with // @ts-check comment:

// @ts-check
import antfu from '@antfu/eslint-config'

export default antfu()

Add script to package.json:

{
  "scripts": {
    "lint": "eslint ."
  }
}

When getting linting errors, try to fix them with nr lint --fix. Don't add lint:fix script.

Git Hooks (simple-git-hooks + lint-staged)

Use simple-git-hooks with lint-staged for pre-commit linting:

{
  "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"
  }
}

Unit Testing (Vitest)

Use Vitest for unit testing.

{
  "scripts": {
    "test": "vitest"
  }
}

Conventions:

• Place test files next to source files: foo.ts → foo.test.ts (same directory)
• High-level tests go in tests/ directory in each package
• Use describe and it API (not test)
• Use expect API for assertions
• Use assert only for TypeScript null assertions
• Use toMatchSnapshot for complex output assertions
• Use toMatchFileSnapshot with explicit file path and extension for language-specific output (exclude those files from linting)

Project Setup

Publishing (Library Projects)

For library projects, publish through GitHub Releases triggered by bumpp:

{
  "scripts": {
    "release": "bumpp -r"
  }
}

Documentation (VitePress)

Use VitePress for documentation. Place docs under docs/ directory.

docs/
├── .vitepress/
│   └── config.ts
├── index.md
└── guide/
    └── getting-started.md

Add script to package.json:

{
  "scripts": {
    "docs:dev": "vitepress dev docs",
    "docs:build": "vitepress build docs"
  }
}

References

Project Setup

| Topic | Description | Reference | |-------|-------------|-----------| | @antfu/eslint-config | ESLint flat config for formatting and linting | antfu-eslint-config | | GitHub Actions | Preferred workflows using sxzz/workflows | github-actions | | .gitignore | Preferred .gitignore for JS/TS projects | gitignore | | VS Code Extensions | Recommended extensions for development | vscode-extensions |

Development

| Topic | Description | Reference | |-------|-------------|-----------| | App Development | Preferences for Vue/Vite/Nuxt/UnoCSS web applications | app-development | | Library Development | Preferences for bundling and publishing TypeScript libraries | library-development | | Monorepo | pnpm workspaces, centralized alias, Turborepo | monorepo |