Ultracite

Ultracite is a zero-configuration preset for the Biome toolchain, designed for modern development teams using TypeScript, React, and Next.js. It solves the critical problem of code inconsistency by providing a single, lightning-fast, and opinionated formatter and linter. Ultracite ensures your entire team—and your AI coding assistants—write perfectly consistent and high-quality code, eliminating configuration overhead and streamlining your workflow.

Key Features

• ⚡ Blazing-Fast Performance Built on Biome and powered by Rust, Ultracite delivers subsecond linting and formatting. It can process thousands of files in milliseconds, making on-save checks feel instantaneous. This means you get immediate feedback without ever interrupting your development flow.

• 🤖 AI & Team Code Consistency Ultracite is designed for the modern, AI-assisted workflow. With synchronized rule files for editors like VS Code and Cursor, it ensures that code generated by AI models automatically conforms to your project's standards. This ends tedious formatting debates and drastically reduces code review friction for everyone involved.

• ⚙️ Zero-Config and Opinionated by Design Get started in seconds with a single command. Ultracite comes with a strict, pre-configured set of best-practice rules optimized for modern web development. This opinionated approach provides immediate value, allowing you to focus on building features instead of debating style guides or managing complex configuration files.

• 🔒 Maximum Type Safety & Accessibility By default, Ultracite enforces strict TypeScript rules and accessibility best practices. It proactively catches potential type errors, unsafe code patterns, and common accessibility violations, helping you write more robust and inclusive applications from the very beginning.

How Ultracite Solves Your Problems:

Ultracite is built to address common development frustrations with practical, effective solutions.

1. Onboarding a New Developer Instantly Instead of a multi-step setup guide for linters and formatters, a new team member can run npx ultracite@latest init. In seconds, their environment is perfectly aligned with your team's coding standards, ensuring they contribute consistent code from their very first commit.

2. Harmonizing AI-Generated Code You're using an AI assistant to generate a new React component, but it uses different import styles and formatting. With Ultracite's editor integration, the moment you paste or save the AI-generated code, it’s automatically reformatted to match your project's conventions, saving you valuable time on manual cleanup.

3. Simplifying Monorepo Management Maintaining separate ESLint and Prettier configurations across dozens of packages in a monorepo is complex and error-prone. Ultracite allows you to manage your entire monorepo with a single, unified biome.jsonc file, eliminating thousands of lines of duplicate configuration and ensuring absolute consistency across all your applications and libraries.

Why Choose Ultracite?

• The Power of Biome, Simplified: You get all the performance benefits of Biome's Rust-based toolchain without the learning curve. Ultracite provides a curated, production-ready configuration so you can be productive immediately.

• Built for the Future of Development: Ultracite embraces the shift towards AI-assisted coding. By creating a unified standard for both human and machine-generated code, it prepares your codebase for a more efficient and collaborative future.

Conclusion:

Ultracite is more than just a formatter; it’s a productivity tool that brings speed, consistency, and sanity to your development process. By providing a fast, zero-config, and AI-ready solution, it allows you and your team to focus on what truly matters: shipping high-quality software.

Explore how Ultracite can streamline your development workflow today!

Frequently Asked Questions (FAQ)

• Q: What is the difference between Ultracite, Biome, and ESLint/Prettier? Think of Biome as the powerful engine and Ultracite as the expertly tuned configuration that sits on top. Biome is the Rust-based tool that performs the actual linting and formatting. Ultracite is a pre-packaged set of rules and settings for Biome, saving you the effort of manual configuration. Unlike the traditional ESLint and Prettier combination, Ultracite (via Biome) consolidates these functions into a single, much faster tool.

• Q: Do I still need ESLint or Prettier if I use Ultracite? No. Ultracite is designed to completely replace the functionality of ESLint and Prettier for your JavaScript and TypeScript projects. For the best experience, it's recommended to remove your old .eslintrc and .prettierrc files to avoid conflicts and rely solely on Ultracite's unified system.

• Q: Can Ultracite fix all the issues it finds automatically? Ultracite can automatically fix a large number of issues, particularly formatting inconsistencies and stylistic lint rules that are safe and deterministic to correct (e.g., removing unused imports). However, it will not automatically fix more complex issues that require developer intent, such as logic errors or missing functionality. It flags these clearly for your manual review, ensuring code behavior is never altered unexpectedly.