# Oxc Whats New

> Recency index for the oxc toolchain (oxlint, oxfmt) — the Rust-based successor to ESLint + Prettier. Covers oxlint's 838 built-in rules and its new type-aware linting (tsgolint, ~97% typescript-eslint parity), oxfmt's beta status and weekly breaking changes, the June 2026 Cloudflare acquisition of VoidZero (oxc's backer), and official ESLint/Prettier migration tooling. Load whenever writing or reviewing oxlint/oxfmt config, migrating a project from ESLint/Prettier, or asked whether oxc is mature enough to adopt for production.

- Skill: `jlreyes/oxc-whats-new` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add jlreyes/oxc-whats-new`
- Raw SKILL.md: https://api.skillmd.com/api/skills/jlreyes/oxc-whats-new/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: jlreyes (https://skillmd.com/u/jlreyes)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/jlreyes/oxc-whats-new

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# oxc: What's New

oxlint and oxfmt (the `oxc` project) ship **jointly, weekly, almost always
on Mondays** — this ecosystem moves faster than TypeScript or Node, and a
coding model's sense of "is this still beta / does this rule exist yet" goes
stale within weeks, not years. This skill is a terse, source-verified
status index — not a tutorial, not a rules reference (use `oxlint --help` /
the live docs at oxc.rs for that).

Facts verified 2026-06-30 against npm registry data, `oxc-project/oxc`'s
GitHub releases, and oxc.rs's live docs/blog — not from memory. Given the
weekly cadence, **treat every version number here as already one release
stale by the time you read it**; the governance and maturity-status claims
(oxlint stable, oxfmt beta, the Cloudflare acquisition) age much slower than
the version numbers do.

## Top-line status (read this first)

**oxlint is production-mature** — hit its 1.0 stability bar in June 2025,
runs at Shopify/Airbnb/Mercedes-Benz/Bun/Preact scale, 838 built-in rules
across native Rust ports of ESLint core + typescript-eslint + react +
import + jsx-a11y + jest/vitest + unicorn + node + jsdoc + next + vue, and
now covers ~97% of typescript-eslint's *type-aware* rules (its historically
biggest gap) via a separate engine called `tsgolint`. **oxfmt is explicitly
still "beta,"** not stable — still 0.x versioned, still shipping breaking
changes in weekly releases, though it claims a 100% pass rate on Prettier's
own JS/TS conformance suite. Bottom line: oxlint is a safe, confident
ESLint+typescript-eslint replacement today; oxfmt is a good, fast Prettier
replacement, adopted with the explicit understanding that it may reformat
code between minor versions — pin discipline and a `format:check` CI gate
matter more here than they would for Prettier.

## At a glance

Every swap documented in `references/oxc-toolchain.md` is listed here, not
just a subset.

| Instead of... | Use... | Why |
|---|---|---|
| `eslint` + `typescript-eslint` + `eslint-plugin-{react,import,jsx-a11y,unicorn,n,...}` | `oxlint` | Native Rust ports of all of the above, 838 rules, 1.0-stable since June 2025 |
| `typescript-eslint`'s type-checked rule configs (`parserOptions.project`) | `oxlint --type-aware` | ~97% rule parity via the `tsgolint` engine — but root-config-only, and budget time to verify the missing ~3% |
| `eslint-plugin-import` / `eslint-import-resolver-typescript` | oxlint's native `import` plugin (e.g. `import/no-cycle`) | Native Rust multi-file analysis, avoids `eslint-plugin-import`'s perf cliff; mature (~2 years), not new |
| `prettier` | `oxfmt` | Faster, 100% Prettier-conformance-suite pass rate — but still beta, expect occasional reformat-the-repo bumps |
| `prettier-plugin-tailwindcss`, prettier import-sort/package.json-sort plugins | oxfmt's built-in `sortTailwindcss`/`sortImports`/`sortPackageJson` options | Natively absorbed, no separate plugin dependency |
| In-house ESLint plugins / niche community ESLint plugins oxlint hasn't ported | oxlint JS Plugins (`definePlugin`/`defineRule`) | Alpha (since 2026-03-11) — useful escape hatch, not yet a hard-CI-gate dependency |
| Hand-migrating `.eslintrc`/`.prettierrc` | `npx @oxlint/migrate` / `oxfmt --migrate prettier` | Official, automated config converters |

### Also worth knowing (status facts, not swaps)

- **Nested-config resolution** mirrors ESLint-legacy behavior (nearest config wins, configs don't merge) — pass `--disable-nested-config` for predictable single-root-config behavior in a monorepo, and remember `typeAware`/`typeCheck` can only be set in the root config.
- **Cloudflare acquired VoidZero** (oxc's backer) on 2026-06-04 — MIT license and vendor-neutrality pledged, with a new $1M independent ecosystem fund, but it's still single-vendor corporate backing, not a foundation. Cite this whenever asked "who backs this."
- oxlint and oxfmt release **jointly, weekly** — re-verify exact version numbers before citing them as current.

## References

- `references/oxc-toolchain.md` — full entries: oxlint scale/stability,
  type-aware linting (tsgolint), oxfmt's beta status and absorbed Prettier
  plugins, JS Plugins (alpha custom-rule API), migration tooling,
  nested-config behavior, native import analysis, and the Cloudflare/VoidZero
  governance change.