Ultracite

Ultracite is a highly opinionated, zero-configuration preset for Biome that provides fast, consistent formatting and linting for JavaScript and TypeScript projects, with features designed for both human developers and AI-assisted code generation. It ships as a preset you can apply to a project (or initialize via the CLI) and includes rules and integrations to reduce configuration overhead. Ultracite emphasizes type-safety, fast feedback, and agent-friendly rules so AI coding assistants produce reliable output.

• Zero-config setup — apply the preset or run the provided init command to add Ultracite to a project quickly and get consistent defaults without manual config changes.
• AI-ready rules — includes specific rules and agent integrations that help LLMs and code agents generate consistent, type-safe code and reduce review friction.
• Editor integrations — provides editor-specific configuration support and works with popular code editors so formatting and linting run on save or in editor panels.
• Auto-fix and CLI workflow — many issues are auto-fixable; use the CLI to run fixes or integrate into CI for automated enforcement.
• Framework presets and migrations — contains framework-specific presets (React/Next/etc.) and migration tools to move from other toolchains.

To get started, add the preset to your project or run the init command the project provides, open your editor with the Ultracite configuration, and run the CLI or editor integration to lint/format files and apply auto-fixes.