Ultracite

What Ultracite Is

Ultracite is a highly opinionated, zero-configuration preset for JavaScript and TypeScript linting and formatting. According to its documentation, it supports three major toolchains: Biome, Oxlint (paired with Oxfmt for formatting), and ESLint (paired with Prettier for formatting and Stylelint for CSS).

Rather than forcing teams to assemble and debate individual lint rules, Ultracite provides a single base preset that can be layered with framework-specific add-ons. The project positions this as particularly useful for teams adopting AI Code Assistant workflows, where consistent code style improves AI-generated output quality.

Multi-Toolchain Architecture

The most distinctive architectural choice is Ultracite's toolchain-agnostic design. The core preset concept — "pull in the core preset, then layer on any framework presets you need" — applies identically across all three supported linters, though the configuration syntax differs per toolchain (Biome uses an extends array; ESLint and Oxlint use imports).

This means a team can switch from ESLint to Biome without discarding their rule preferences — only the config syntax changes. The documentation includes a language-support matrix documenting what each toolchain supports natively, flagging Vue, Svelte, and Astro as experimental on Biome, and noting that Prettier ships the widest built-in language coverage but relies on community plugins for Svelte and Astro.

Developer Experience

Ultracite targets VS Code as its primary editing surface. On save, it applies all auto-fixable rules — converting != to !==, removing unused imports, fixing import ordering — via the codeActionsOnSave setting. Non-fixable issues appear as squiggly underlines in the Problems panel.

A CLI surface provides check, fix, and validate commands for CI pipelines. Optional Git hooks integration supports husky, lefthook, lint-staged, and pre-commit, enabling teams to enforce lint compliance before commits land.

Monorepo and Framework Support

The documentation dedicates a full section to monorepo usage with Turborepo, describing shared presets, workspace-aware configuration, and repo-wide editor defaults. Framework presets are documented but their exact coverage is not enumerated in the available passages.

An optional type-aware Biome preset enables project-graph-level rules — import cycle detection, undeclared dependency checks, and deprecated import warnings — though the documentation acknowledges these rules are slower because they require Biome's scanner.

What's Missing from the Evidence

The available source passages do not disclose pricing, launch date, country of origin, or the full roster of framework presets. The documentation references a troubleshooting page addressing common setup and editor integration issues, suggesting the project has seen real-world usage, but no community metrics or adoption data are present in the source packet.