Replace deno lint with Oxlint

.agents/skills/create-integration-package/package/deno.jsonc

@@ -22,7 +22,7 @@
     ]
   },
   "tasks": {
-    "check": "deno fmt --check && deno lint && deno check src/*.ts",
+    "check": "deno fmt --check && deno check src/*.ts",
     "test": "deno test" // Add if --allow-* for permissions is needed
   }
 }

.devcontainer/devcontainer.json

@@ -14,6 +14,7 @@
     "vscode": {
       "extensions": [
         "denoland.vscode-deno",
+        "oxc.oxc-vscode",
         "redhat.vscode-yaml",
         "streetsidesoftware.code-spell-checker"
       ]

.hongdown.toml

@@ -15,6 +15,7 @@ exclude = [
   "WARP.md",
   "changes.d/**",
   "packages/fedify/src/cfworkers/**",
+  "tools/oxlint/anti-slop/**",
   "plan.md",
   "**/plans/**",
 ]

.oxlintrc.json

@@ -0,0 +1,249 @@
+{
+  "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "plugins": [
+    "typescript",
+    "react",
+    "unicorn",
+    "oxc",
+    "import",
+    "promise",
+    "vitest",
+    "jsx-a11y"
+  ],
+  "categories": {
+    "correctness": "off",
+    "suspicious": "off",
+    "pedantic": "off",
+    "perf": "off",
+    "style": "off",
+    "restriction": "off",
+    "nursery": "off"
+  },
+  "options": {
+    "reportUnusedDisableDirectives": "error"
+  },
+  "jsPlugins": [
+    {
+      "name": "anti-slop",
+      "specifier": "./tools/oxlint/anti-slop/index.ts"
+    },
+    {
+      "name": "@logtape",
+      "specifier": "@logtape/lint/eslint"
+    }
+  ],
+  "overrides": [
+    {
+      "files": [
+        "packages/cli/**"
+      ],
+      "rules": {
+        "eslint/no-console": "off"
+      }
+    },
+    {
+      "files": [
+        "examples/fresh/**"
+      ],
+      "rules": {
+        "react/no-danger": "error",
+        "react/no-danger-with-children": "error",
+        "react/rules-of-hooks": "error"
+      }
+    }
+  ],
+  "rules": {
+    "typescript/adjacent-overload-signatures": "error",
+    "typescript/ban-ts-comment": [
+      "error",
+      {
+        "ts-check": false,
+        "ts-expect-error": "allow-with-description",
+        "ts-ignore": "allow-with-description",
+        "ts-nocheck": "allow-with-description",
+        "minimumDescriptionLength": 1
+      }
+    ],
+    "typescript/no-wrapper-object-types": "error",
+    "typescript/no-unsafe-function-type": "error",
+    "eslint/constructor-super": "error",
+    "eslint/for-direction": "error",
+    "eslint/getter-return": "error",
+    "react/jsx-boolean-value": "error",
+    "react/button-has-type": "error",
+    "react/jsx-curly-brace-presence": [
+      "error",
+      {
+        "propElementValues": "always"
+      }
+    ],
+    "react/jsx-key": [
+      "error",
+      {
+        "checkKeyMustBeforeSpread": false
+      }
+    ],
+    "react/no-children-prop": "error",
+    "react/jsx-no-comment-textnodes": "error",
+    "react/jsx-no-duplicate-props": "error",
+    "react/no-unescaped-entities": "error",
+    "react/jsx-no-useless-fragment": "error",
+    "react/jsx-props-no-spread-multi": "error",
+    "react/void-dom-elements-no-children": "error",
+    "eslint/no-array-constructor": "error",
+    "eslint/no-async-promise-executor": "error",
+    "eslint/no-await-in-loop": "warn",
+    "eslint/no-case-declarations": "error",
+    "eslint/no-class-assign": "error",
+    "eslint/no-compare-neg-zero": "error",
+    "eslint/no-cond-assign": "error",
+    "eslint/no-console": "warn",
+    "eslint/no-const-assign": "error",
+    "eslint/no-constant-condition": [
+      "error",
+      {
+        "checkLoops": false
+      }
+    ],
+    "eslint/no-control-regex": "error",
+    "eslint/no-debugger": "error",
+    "eslint/no-delete-var": "error",
+    "eslint/no-dupe-class-members": "error",
+    "eslint/no-dupe-else-if": "error",
+    "eslint/no-dupe-keys": "error",
+    "eslint/no-duplicate-case": "error",
+    "eslint/no-empty": "error",
+    "eslint/no-empty-character-class": "error",
+    "typescript/no-empty-interface": [
+      "error",
+      {
+        "allowSingleExtends": true
+      }
+    ],
+    "typescript/no-empty-object-type": [
+      "error",
+      {
+        "allowInterfaces": "always"
+      }
+    ],
+    "eslint/no-empty-pattern": "error",
+    "eslint/no-ex-assign": "error",
+    "typescript/no-explicit-any": "error",
+    "eslint/no-extra-boolean-cast": "error",
+    "typescript/no-extra-non-null-assertion": "error",
+    "eslint/no-fallthrough": "error",
+    "eslint/no-func-assign": "error",
+    "eslint/no-global-assign": "error",
+    "eslint/no-import-assign": "error",
+    "eslint/no-inner-declarations": "error",
+    "eslint/no-invalid-regexp": "error",
+    "eslint/no-irregular-whitespace": "error",
+    "typescript/no-misused-new": "error",
+    "typescript/no-namespace": "error",
+    "eslint/no-new-native-nonconstructor": "error",
+    "eslint/no-obj-calls": "error",
+    "eslint/no-prototype-builtins": "error",
+    "eslint/no-redeclare": "error",
+    "eslint/no-regex-spaces": "error",
+    "eslint/no-self-assign": "error",
+    "eslint/no-setter-return": "error",
+    "eslint/no-shadow-restricted-names": "error",
+    "typescript/no-this-alias": "error",
+    "eslint/no-this-before-super": "error",
+    "eslint/no-unreachable": "error",
+    "eslint/no-unsafe-finally": "error",
+    "eslint/no-unsafe-negation": "error",
+    "eslint/no-unused-labels": "error",
+    "eslint/no-unused-vars": [
+      "error",
+      {
+        "args": "all",
+        "argsIgnorePattern": "^_",
+        "caughtErrors": "all",
+        "caughtErrorsIgnorePattern": "^_",
+        "destructuredArrayIgnorePattern": "^_",
+        "varsIgnorePattern": "^_"
+      }
+    ],
+    "eslint/no-var": "error",
+    "eslint/no-with": "error",
+    "typescript/prefer-as-const": "error",
+    "eslint/prefer-const": [
+      "error",
+      {
+        "destructuring": "all"
+      }
+    ],
+    "typescript/prefer-namespace-keyword": "error",
+    "eslint/require-await": "error",
+    "eslint/require-yield": "error",
+    "eslint/use-isnan": "error",
+    "eslint/valid-typeof": "error",
+    "oxc/no-accumulating-spread": "error",
+    "anti-slop/no-module-mocking": "error",
+    "anti-slop/no-reduce-accumulator-copy": "error",
+    "anti-slop/no-unknown-type-aliases": "error",
+    "anti-slop/no-widen-then-assert": "error",
+    "anti-slop/no-array-filter-map": "error",
+    "anti-slop/no-reflect-get": "error",
+    "anti-slop/no-reflect-apply": "error",
+    "import/no-duplicates": "error",
+    "promise/no-nesting": "error",
+    "promise/no-return-wrap": "error",
+    "eslint/no-throw-literal": "error",
+    "eslint/no-unsafe-optional-chaining": "error",
+    "eslint/no-self-compare": "error",
+    "eslint/no-useless-escape": "error",
+    "unicorn/prefer-node-protocol": "error",
+    "unicorn/prefer-includes": "error",
+    "unicorn/error-message": "error",
+    "unicorn/no-array-for-each": "error",
+    "typescript/no-import-type-side-effects": "error",
+    "typescript/prefer-for-of": "error",
+    "typescript/no-extraneous-class": "error",
+    "@logtape/no-message-interpolation": "error",
+    "@logtape/prefer-lazy-evaluation": "warn",
+    "@logtape/no-unawaited-log": "error",
+    "@logtape/require-meta-sink": "warn",
+    "eslint/no-useless-return": "error"
+  },
+  "ignorePatterns": [
+    "**/pnpm-lock.yaml",
+    "pnpm-workspace.yaml",
+    ".agents/skills/**",
+    ".claude/skills/**",
+    ".claude-plugin/**",
+    ".github/**",
+    "claude-plugin/**",
+    "docs/**",
+    "**/*.md",
+    "**/*.html",
+    "**/*.svg",
+    "**/*.astro",
+    "**/*.svelte",
+    "**/*.vue",
+    "**/*.css",
+    "examples/cloudflare-workers/worker-configuration.d.ts",
+    "packages/cli/src/init/templates/**",
+    "packages/init/src/templates/**",
+    "packages/cfworkers/test/**",
+    "packages/fedify/src/cfworkers/dist/**",
+    "packages/fedify/src/cfworkers/fixtures/**",
+    "packages/fedify/src/cfworkers/imports.ts",
+    "packages/fedify/src/cfworkers/server.ts",
+    "packages/fedify/src/cfworkers/runner.ts",
+    "packages/fedify/src/cfworkers/selftest.ts",
+    "packages/fedify/src/cfworkers/server.js",
+    "packages/fedify/src/cfworkers/server.js.map",
+    "packages/sqlite/src/sqlite.bun.ts",
+    "examples/fresh/_fresh/**",
+    "examples/astro/.astro/**",
+    "**/dist/**",
+    "**/dist-tests/**",
+    "**/node_modules/**",
+    "**/npm/**",
+    "**/apidoc/**",
+    "**/*.test-report.xml",
+    "tools/oxlint/anti-slop/**"
+  ]
+}

.vscode/extensions.json

@@ -1,6 +1,7 @@
 {
   "recommendations": [
     "denoland.vscode-deno",
+    "oxc.oxc-vscode",
     "redhat.vscode-yaml",
     "streetsidesoftware.code-spell-checker"
   ]

.vscode/settings.json

@@ -1,5 +1,6 @@
 {
   "deno.enable": true,
+  "deno.lint": false,
   "deno.unstable": true,
   "editor.detectIndentation": false,
   "editor.indentSize": 2,

.zed/settings.json

@@ -4,6 +4,7 @@
       "settings": {
         "deno": {
           "enable": true,
+          "lint": false,
           "unstable": true
         }
       }

CONTRIBUTING.md

@@ -107,8 +107,8 @@ Development environment
 -----------------------
 
 Fedify is a TypeScript monorepo.  Node.js runs dependency installation, code
-generation, builds, type checking, maintenance scripts, and test harnesses.
-Formatting, linting, and the local CLI still use Deno.  Supported packages
+generation, builds, type checking, maintenance scripts, test harnesses, and
+linting.  Formatting and the local CLI still use Deno.  Supported packages
 are tested on Deno, Node.js, and Bun.  [mise] installs the required tool
 versions and runs repository tasks.  Install mise before bootstrapping; it
 provisions Node.js and the tools declared in *mise.toml*, so Node.js needs no
@@ -135,8 +135,8 @@ Install or refresh the pre-commit hook explicitly with
 
 To bootstrap without installing Deno, set `MISE_DISABLE_TOOLS=deno` before
 running `mise install` (for example, `$env:MISE_DISABLE_TOOLS = "deno"` in
-PowerShell).  Deno is still needed for the current formatting, linting, and
-Deno compatibility tasks; those tools are being migrated separately.
+PowerShell).  Deno is still needed for the current formatting and Deno
+compatibility tasks; linting runs on Oxlint and does not need Deno.
 
 Run development workflows through mise.  Do not call `npm` or `pnpm` directly
 for repository tasks.  Start by inspecting the available commands:
@@ -238,6 +238,25 @@ Deno task, since that option omits task dependencies. The existing Deno
 `compile` tasks still generate vocabulary, but no longer cache or type-check it
 as a side effect.
 
+### Linting
+
+Linting uses [Oxlint] and the root *.oxlintrc.json*.  Run it with:
+
+~~~~ bash
+mise run check:lint
+mise run check-each fedify
+~~~~
+
+The configuration mirrors the rule set that the repository previously used
+with `deno lint`; [linting.md] documents the mapping and the accepted gaps.
+Name rules explicitly in `oxlint-disable` comments and add a short reason when
+the suppression is not obvious.  The editor setup keeps the Deno language
+server for formatting and type diagnostics but disables `deno.lint`, so Oxlint
+is the only lint source.
+
+[Oxlint]: https://oxc.rs/docs/guide/usage/linter/
+[linting.md]: LINTING.md
+
 ### Type checking
 
 `mise run check:types` type-checks the repository with TypeScript on Node.js,