Oxc — The JavaScript Oxidation Compiler Written in Rust

What it is

Oxc (JavaScript Oxidation Compiler) is a Rust-based collection of JavaScript and TypeScript tools. It includes a parser, linter (oxlint), resolver, transformer, and minifier, each designed to be the fastest in its category. Oxc powers next-generation tools like Rolldown (the Vite bundler) and provides drop-in replacements for ESLint, Babel, and terser.

Oxc targets JavaScript and TypeScript developers who want faster tooling without changing their workflow. It also targets tool authors who need a fast, correct AST parser as a foundation.

How it saves time or tokens

ESLint, Babel, and terser are JavaScript-based tools that parse and transform ASTs in a single-threaded runtime. Oxc reimplements these in Rust with parallel execution, achieving 10-100x speedups. Running oxlint on a large codebase takes seconds instead of minutes. This directly reduces CI time and developer feedback loops.

How to use

1. Install the linter: npm install -g oxlint.
2. Run on your codebase: oxlint src for ESLint-compatible linting.
3. Use Oxc as part of Rolldown or integrate the parser via the oxc npm packages for custom tooling.

Example

# Install and run the linter
npm install -g oxlint
oxlint src

# Lint with specific rule categories
oxlint --deny-warnings src

# Use as a project dev dependency
npm install -D oxlint
npx oxlint src

// package.json script integration
{
  "scripts": {
    "lint": "oxlint src",
    "lint:fix": "oxlint --fix src"
  }
}

Related on TokRepo

• Coding Tools -- JavaScript/TypeScript developer tools
• Automation Tools -- Build and linting tools

Common pitfalls

• Expecting full ESLint plugin compatibility. oxlint implements the most popular ESLint rules natively but does not support custom ESLint plugins written in JavaScript.
• Running oxlint alongside ESLint without disabling overlapping rules. This produces duplicate warnings and slows down the lint step.
• Assuming Oxc's transformer covers all Babel plugins. Oxc focuses on the most common transformations (JSX, TypeScript, decorators) but niche Babel plugins may not have equivalents yet.