When to use

Use this skill when you need to:

• Set up linting and formatting in a JavaScript, TypeScript, CSS, or JSON project using Biome
• Configure biome.json / biome.jsonc for a project
• Migrate from ESLint, Prettier, or other linters/formatters to Biome
• Run linting and formatting consistently in CI and local development

How to use

Read individual rule files for implementation details and examples:

• rules/biome-setup.md - Install, configure, and customize Biome
• rules/biome-config.md - Build biome.json config for JS/TS/CSS/JSON projects
• rules/migration-from-eslint-prettier.md - Migrate from ESLint and/or Prettier to Biome
• rules/ci-and-editor-integration.md - CI scripts, pre-commit, and editor setup

Core principles

• Prefer reproducible linting with pinned exact versions (-E flag)
• Keep config minimal and explicit
• Use biome check as the single command for lint + format + import sorting
• Treat lint and format failures as quality gates in CI using biome ci
• Enable auto-fix with --write for local workflows, but validate with biome ci in CI