Linter Formatter Init

Set up comprehensive linting, formatting, and testing for JavaScript/TypeScript projects using Biome 2.3+ (default), Vitest, and Bun.

IMPORTANT: Always uses Biome 2.3+ (latest) - never older versions.

Purpose

This skill automates the setup of:

• Biome for linting + formatting (default, recommended)
• Vitest for testing with coverage (use --vitest flag)
• ESLint + Prettier (legacy, use --eslint flag)
• Husky + lint-staged for pre-commit hooks
• VS Code/Cursor settings for auto-format on save
• bun scripts for manual linting, formatting, and testing

When to Use