Changelog - 2026-10-16

IGNIS lints with oxlint and formats with oxfmt

New Feature Enhancement

In one line. @venizia/dev-configs 0.3.0 ships oxlint and oxfmt configs next to the ESLint and Prettier ones, and the IGNIS repository uses them. It is the only package released for this change.

// .configs/oxlint.config.mts
import { defineConfig } from 'oxlint';
import { oxlintConfigs } from '@venizia/dev-configs/linters';

export default defineConfig(oxlintConfigs);

On packages/kernel (253 files), linting went from 8.16s to about 0.8s with type-aware rules on, and formatting from 2.16s to 0.06s.

What changed

• oxlint replaces ESLint for linting. oxlintConfigs is a rule-for-rule port of the previous preset. Type-aware rules run through oxlint-tsgolint.
• oxfmt replaces Prettier. oxfmtConfigs holds the same seven options as prettierConfigs.
• ESLint stays for one rule. @typescript-eslint/naming-convention has no oxlint port yet, so namingConventionConfigs runs it alone.
• Every project owns a .configs/ folder. It holds oxlint.config.mts, oxfmt.config.mts and eslint.config.mjs. Packages also keep tsconfig.build.json and tsconfig.esm.json there. tsconfig.json stays at the project root.
• eslintConfigs is owned by IGNIS. It no longer wraps @minimaltech/eslint-node. The rules live in linters/eslint.ts and resolve to the same config as before, rule for rule.
• The TypeScript target is ES2025. tsconfig.base.json and tsconfig.common.json move from ES2024 to ES2025, target and lib. The emitted JavaScript of every IGNIS package is unchanged; the gain is the ES2025 types (Set methods, iterator helpers, Promise.try).
• New @venizia/dev-configs exports. Subpaths /compilers, /formatters and /linters, plus one class per rule (see the table below).

New export	From	Use
oxlintConfigs	/linters	The oxlint rules
namingConventionConfigs	/linters	ESLint config with the naming-convention rule only
EqeqeqRule, NoUnusedVarsRule, SwitchCaseBracesRule, NoRestrictedImportsRule, PreferNullishCoalescingRule, NamingConventionRule	/linters	Rebuild one rule with build() to customize it
ReactOxlintConfigs	/linters	The React preset for oxlint, as strict as the backend preset
reactNamingConventionConfigs	/linters	The naming rule for a React project (PascalCase components)
NoRestrictedPropertiesRule	/linters	Bans crypto.randomUUID, which a plain-http origin does not have
oxfmtConfigs	/formatters	The oxfmt options

Who is affected

• Contributors to the IGNIS repository. Use the new commands below. The .prettierrc.mjs, .prettierignore and root eslint.config.mjs files are gone.
• Consumers of @venizia/dev-configs. No lint action needed. eslintConfigs, prettierConfigs, ReactEslintConfigs, BunCompiler and the two tsconfig exports keep their shape, and the root import still re-exports everything.
• Consumers of ReactEslintConfigs. The preset no longer relaxes the base for a UI: no-floating-promises, no-void, no-use-before-define, no-shadow and no-unused-vars are errors again, exhaustive-deps is an error, and crypto.randomUUID is banned. Await or .catch() every promise a handler starts, and declare a component above its first use.
• Consumers that extend tsconfig.common.json. Your target becomes ES2025. Your runtime needs ES2025 support (Bun 1.4 and Node 24 have it); a bundler that rejects ES2025 needs its own target, as the IGNIS wiki does for esbuild.
• Consumers who want the faster tools. Switch with the steps below.

For contributors

Command	What it does
make lint-<pkg>	oxlint, ESLint and an oxfmt check for one package, e.g. make lint-kernel
make fmt-<pkg>	The same with fixes applied
make lint-packages / make fmt	Every package
make lint-all	Packages, examples, example typecheck and scripts/
make build / make rebuild / make clean / make typecheck	Inside a package: build, type-check then clean then build, clean, type-check
make <pkg>	From the root: rebuild one package after its dependencies, as before

Each package now has a two-to-four-line Makefile that includes the shared make/project.mk. Its package.json keeps only force-update, prepublishOnly (make rebuild) and, for atlas and boot, test. The scripts/build.sh, clean.sh and rebuild.sh files are gone, and so are the lint and prettier:* scripts. Examples keep their own scripts, because you copy them.

Two things to know when you touch a build or lint config:

• Every tool call passes -c .configs/<tool>.config.mts. No tool finds that folder on its own.
• An ignorePatterns entry inside .configs/ resolves against .configs/, so it matches nothing. dist and node_modules are skipped through .gitignore.

oxlint exits 0 when it finds only warnings, so every lint call passes --deny-warnings: a warning fails the build, as it did under ESLint.

For consumers: switch to oxlint and oxfmt

1. Replace the tools:

   bun remove prettier
   bun add -d @venizia/dev-configs oxlint oxlint-tsgolint oxfmt eslint

2. Create .configs/oxlint.config.mts, .configs/oxfmt.config.mts and .configs/eslint.config.mjs with the three snippets in the package README. Keep the ESLint config .mjs: ESLint loads a TypeScript config only through jiti, one more dependency. oxlint and oxfmt read their .mts configs on their own.

3. Update your scripts to pass -c:

   {
     "lint": "oxlint -c .configs/oxlint.config.mts --deny-warnings && eslint -c .configs/eslint.config.mjs . && oxfmt -c .configs/oxfmt.config.mts --check \"**/*.{ts,tsx,mts,js,mjs}\"",
     "lint:fix": "oxlint -c .configs/oxlint.config.mts --fix && eslint -c .configs/eslint.config.mjs . --fix && oxfmt -c .configs/oxfmt.config.mts \"**/*.{ts,tsx,mts,js,mjs}\""
   }

4. Delete .prettierrc.mjs, .prettierignore and the old eslint.config.mjs.

5. Remove "./*.config.*" and ".prettierrc.*" from your tsconfig.json include. Keep tsconfig.json at the root.

6. Run lint:fix once.

Details

• Format drift. oxfmt breaks long union types with a leading | per line, where Prettier does not. Expect one round of reformatting.
• Unused disable comments. Drop --report-unused-disable-directives. oxlint does not run the naming-convention rule, so it would flag every naming disable comment as unused.
• Stricter checks. oxlint caught four real no-unsafe-optional-chaining bugs that ESLint missed: (x?.y as T).z still throws when x is undefined.
• Not ported. prefer-optional-chain (an oxlint nursery rule) and no-invalid-this (covered by noImplicitThis). n/prefer-node-protocol became unicorn/prefer-node-protocol.
• Peer dependencies. oxlint (>=1.88.0), oxfmt (>=0.73.0), and oxlint-tsgolint (>=7.0.2004) are new optional peers. typescript-eslint is a new dependency.
• Upgrading the range. 0.3.0 is a minor bump on a 0.x package, so a ^0.2.x range does not reach it - write ^0.3.0.
• TypeScript. oxlint-tsgolint is built on TypeScript 7 and works in a project on 6.
• Build. tsc-alias must read the root tsconfig.json, not a .configs/ one, or @/... imports stay unrewritten in dist. dev-configs now compiles with target ES2024.

See Tooling Configuration for the full setup and rule customization.

Files: packages/dev-configs/src/linters/oxlint.ts, packages/dev-configs/src/linters/eslint.ts, Makefile