Oxlint

Oxlint is a Rust-based linter that's 50–100× faster than ESLint. We position it as additive to Biome — Biome stays the source of truth for formatting and the broad lint baseline; Oxlint adds a faster pass for type-aware and import rules Biome doesn't cover yet.

Setup

The setup wizard offers Oxlint as an opt-in after the primary linter prompt:

? 🔍 Which linting/formatting tool? ⚡ Biome
? 🦀 Also run Oxlint alongside (50–100× faster than ESLint)? Yes

If you opt in, the wizard drops .oxlintrc.json at the project root using the canonical preset.

Adding to an existing project

npx @rtorcato/js-tooling copy oxlint

Add a script to your package.json:

{
  "scripts": {
    "oxlint": "oxlint",
    "verify": "pnpm typecheck && pnpm lint && pnpm oxlint && pnpm test --run"
  }
}

Configuration

The shipped preset (tooling/oxlint/oxlintrc.json) enables:

Category	Severity	Notes
correctness	error	bugs, type errors
perf	warn	known perf footguns
suspicious	warn	likely-wrong patterns
pedantic / style / restriction / nursery	off	overlaps with Biome / too noisy

Plugins enabled: typescript, unicorn, oxc, import.

Customising

Oxlint configs are project-owned (Oxlint's extends from npm packages isn't reliably supported), so once .oxlintrc.json is in your repo you fully own it. Drop the categories and rules you don't want.

When to skip Oxlint

• Solo projects where Biome alone catches enough.
• Repos with very small surface area (the speed advantage doesn't matter under ~5k LOC).
• Projects that use ESLint as their primary linter — running both is redundant.