Add oxlint plugin to @fedify/lint

.hongdown.toml

@@ -88,6 +88,7 @@ proper_nouns = [
   "ngrok",
   "Object Integrity Proofs",
   "OpenTelemetry",
+  "Oxlint",
   "Piefed",
   "Pixelfed",
   "Pleroma",

docs/manual/lint.md

@@ -1,8 +1,8 @@
 ---
 description: >-
-  Fedify provides linting plugins for Deno Lint and ESLint to help you catch
-  common mistakes and enforce best practices when building federated server
-  apps.
+  Fedify provides linting plugins for Deno Lint, ESLint, and Oxlint to help you
+  catch common mistakes and enforce best practices when building federated
+  server apps.
 ---
 
 Linting
@@ -15,8 +15,9 @@ _This package is available since Fedify 2.0.0._
 > app to catch common mistakes early and enforce best practices.
 
 Fedify provides the [`@fedify/lint`] package, which includes lint rules
-specifically designed for Fedify applications. It supports both [Deno Lint] and
-[ESLint], so you can use it regardless of your JavaScript/TypeScript runtime.
+specifically designed for Fedify applications. It supports [Deno Lint],
+[ESLint], and [Oxlint], so you can use it regardless of your
+JavaScript/TypeScript runtime.
 
 The plugin includes rules that check for:
 
@@ -29,6 +30,7 @@ The plugin includes rules that check for:
 [`@fedify/lint`]: https://jsr.io/@fedify/lint
 [Deno Lint]: https://docs.deno.com/runtime/reference/lint_plugins/
 [ESLint]: https://eslint.org/
+[Oxlint]: https://oxc.rs/docs/guide/usage/linter/
 
 
 Installation
@@ -262,6 +264,114 @@ bunx eslint .
 :::
 
 
+Oxlint
+------
+
+[Oxlint] is a fast Rust-based linter that supports ESLint-compatible JS
+plugins. `@fedify/lint` exposes its rules through Oxlint's [JS plugin API]
+via the `@fedify/lint/oxlint` subpath export.
+
+> [!NOTE]
+> Oxlint's JS plugin API is currently in alpha and not subject to semver.
+
+[JS plugin API]: https://oxc.rs/docs/guide/usage/linter/writing-js-plugins.html
+
+### Basic setup
+
+Add the plugin to your _.oxlintrc.json_ via the `jsPlugins` field, then enable
+the rules you want:
+
+~~~~ json
+{
+  "$schema": "https://raw.githubusercontent.com/oxc-project/oxc/main/npm/oxlint/configuration_schema.json",
+  "jsPlugins": ["@fedify/lint/oxlint"],
+  "rules": {
+    "@fedify/lint/actor-id-required": "error",
+    "@fedify/lint/actor-id-mismatch": "error"
+  }
+}
+~~~~
+
+Rule IDs are namespaced under `@fedify/lint/`, matching the ESLint preset.
+
+### Custom configuration
+
+Each rule accepts `"error"`, `"warn"`, or `"off"`. Enable any subset listed in
+the [*Rules* section](#rules) below:
+
+~~~~ json
+{
+  "jsPlugins": ["@fedify/lint/oxlint"],
+  "rules": {
+    "@fedify/lint/actor-id-required": "error",
+    "@fedify/lint/actor-id-mismatch": "error",
+    "@fedify/lint/actor-inbox-property-required": "warn",
+    "@fedify/lint/actor-outbox-property-required": "warn",
+    "@fedify/lint/actor-followers-property-required": "warn",
+    "@fedify/lint/actor-public-key-required": "warn",
+    "@fedify/lint/actor-assertion-method-required": "warn",
+    "@fedify/lint/collection-filtering-not-implemented": "warn"
+  }
+}
+~~~~
+
+### Running Oxlint
+
+Add a script to _package.json_:
+
+~~~~ jsonc
+{
+  "scripts": {
+    "lint": "oxlint ."
+  }
+}
+~~~~
+
+Then run the linter:
+
+::: code-group
+
+~~~~ sh [npm]
+npm run lint
+~~~~
+
+~~~~ sh [pnpm]
+pnpm lint
+~~~~
+
+~~~~ sh [Yarn]
+yarn lint
+~~~~
+
+~~~~ sh [Bun]
+bun lint
+~~~~
+
+:::
+
+Or invoke Oxlint directly:
+
+::: code-group
+
+~~~~ sh [npm]
+npx oxlint .
+~~~~
+
+~~~~ sh [pnpm]
+pnpx oxlint .
+~~~~
+
+~~~~ sh [Yarn]
+yarn oxlint .
+~~~~
+
+~~~~ sh [Bun]
+bunx oxlint .
+~~~~
+
+:::
+
+
 Rules
 -----
 
@@ -1217,10 +1327,12 @@ See also
  -  [`@fedify/lint` on npm]
  -  [Deno Lint plugins documentation]
  -  [ESLint documentation]
+ -  [Oxlint documentation]
  -  [Example project]
 
 [`@fedify/lint` on JSR]: https://jsr.io/@fedify/lint
 [`@fedify/lint` on npm]: https://www.npmjs.com/package/@fedify/lint
 [Deno Lint plugins documentation]: https://docs.deno.com/runtime/reference/lint_plugins/
 [ESLint documentation]: https://eslint.org/
+[Oxlint documentation]: https://oxc.rs/docs/guide/usage/linter/
 [Example project]: https://github.com/fedify-dev/fedify/tree/main/examples/lint

examples/lint/oxlint/.oxlintrc.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://raw.githubusercontent.com/oxc-project/oxc/main/npm/oxlint/configuration_schema.json",
+  "jsPlugins": ["@fedify/lint/oxlint"],
+  "rules": {
+    "@fedify/lint/actor-id-required": "error",
+    "@fedify/lint/actor-id-mismatch": "error",
+    "@fedify/lint/actor-inbox-property-required": "warn",
+    "@fedify/lint/actor-outbox-property-required": "warn",
+    "@fedify/lint/actor-followers-property-required": "warn"
+  }
+}

examples/lint/oxlint/README.md

@@ -0,0 +1,63 @@
+<!-- deno-fmt-ignore-file -->
+
+@fedify/lint with Oxlint
+========================
+
+This example demonstrates how to use [`@fedify/lint`] together with [Oxlint]
+to catch common Fedify federation mistakes.  Note that Oxlint's JS plugin
+support is upstream alpha and may be unstable.
+
+[`@fedify/lint`]: https://www.npmjs.com/package/@fedify/lint
+[Oxlint]: https://oxc.rs/docs/guide/usage/linter/
+
+
+Layout
+------
+
+ -  *.oxlintrc.json* — Oxlint configuration that enables `@fedify/lint`
+    via the JS plugin API.
+ -  *federation.ts* — code that intentionally violates several rules
+    (missing `id`, `inbox`, `outbox`, `followers`).
+ -  *federation.fixed.ts* — corrected version that passes all rules.
+
+
+Usage
+-----
+
+Install dependencies and run the linter:
+
+~~~~ sh
+pnpm install
+pnpm lint
+~~~~
+
+You should see at least one `@fedify/lint(actor-id-required)` error on
+*federation.ts*. Running against *federation.fixed.ts* alone produces no
+diagnostics:
+
+~~~~ sh
+pnpm lint:fixed
+~~~~
+
+
+How it works
+------------
+
+The plugin is loaded via the `jsPlugins` field in *.oxlintrc.json*:
+
+~~~~ json
+{
+  "jsPlugins": ["@fedify/lint/oxlint"],
+  "rules": {
+    "@fedify/lint/actor-id-required": "error"
+  }
+}
+~~~~
+
+`@fedify/lint/oxlint` is a subpath export that exposes the same rules as the
+ESLint plugin in Oxlint's plugin shape. Rule IDs are namespaced under
+`@fedify/lint/`.
+
+See the [Linting] manual for the full rule reference.
+
+[Linting]: https://fedify.dev/manual/lint

examples/lint/oxlint/federation.fixed.ts

@@ -0,0 +1,21 @@
+import {
+  createFederation,
+  InProcessMessageQueue,
+  MemoryKvStore,
+} from "@fedify/fedify";
+import { Person } from "@fedify/vocab";
+
+const federation = createFederation<void>({
+  kv: new MemoryKvStore(),
+  queue: new InProcessMessageQueue(),
+});
+
+federation.setActorDispatcher("/users/{identifier}", (ctx, identifier) => {
+  return new Person({
+    id: ctx.getActorUri(identifier),
+    name: "Example User",
+    inbox: ctx.getInboxUri(identifier),
+    outbox: ctx.getOutboxUri(identifier),
+    followers: ctx.getFollowersUri(identifier),
+  });
+});

examples/lint/oxlint/federation.ts

@@ -0,0 +1,17 @@
+import {
+  createFederation,
+  InProcessMessageQueue,
+  MemoryKvStore,
+} from "@fedify/fedify";
+import { Person } from "@fedify/vocab";
+
+const federation = createFederation<void>({
+  kv: new MemoryKvStore(),
+  queue: new InProcessMessageQueue(),
+});
+
+federation.setActorDispatcher("/users/{identifier}", (_ctx, _identifier) => {
+  return new Person({
+    name: "Example User",
+  });
+});

examples/lint/oxlint/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "@fedify/example-lint-oxlint",
+  "version": "0.0.0",
+  "private": true,
+  "description": "Example project demonstrating @fedify/lint with oxlint",
+  "type": "module",
+  "scripts": {
+    "lint": "oxlint .",
+    "lint:fixed": "oxlint federation.fixed.ts"
+  },
+  "dependencies": {
+    "@fedify/fedify": "workspace:^",
+    "@fedify/vocab": "workspace:^"
+  },
+  "devDependencies": {
+    "@fedify/lint": "workspace:^",
+    "oxlint": "catalog:"
+  }
+}