feat: respect .remarkignore at the same time (#561)

close #502

Author: JounQin

Diff for: .changeset/great-snakes-nail.md

@@ -1,5 +1,4 @@
 ---
-"eslint-mdx": minor
 "eslint-plugin-mdx": minor
 ---
 

Diff for: .changeset/lovely-spiders-fetch.md

@@ -0,0 +1,5 @@
+---
+"eslint-mdx": minor
+---
+
+feat: respect `.remarkignore` at the same time

Diff for: package.json

@@ -41,9 +41,8 @@
     "@types/react": "^19.1.0",
     "@types/unist": "^3.0.3",
     "@unts/patch-package": "^8.1.1",
-    "@vitest/coverage-istanbul": "^3.1.1",
     "concurrently": "^9.1.2",
-    "eslint": "^9.23.0",
+    "eslint": "^9.24.0",
     "eslint-plugin-react": "^7.37.5",
     "globals": "^16.0.0",
     "jest": "^30.0.0-alpha.7",
@@ -55,7 +54,7 @@
     "simple-git-hooks": "^2.12.1",
     "ts-node": "^10.9.2",
     "type-coverage": "^2.29.7",
-    "typescript": "^5.8.2",
+    "typescript": "^5.8.3",
     "yarn-berry-deduplicate": "^6.1.1"
   },
   "resolutions": {

Diff for: packages/eslint-mdx/src/types.ts

@@ -72,3 +72,35 @@ export interface PackageJson {
   name: string
   version: string
 }
+
+/**
+ * temporary workaround for missing `Ignore` from `unified-engine`
+ *
+ * See also {@link https://github.com/unifiedjs/unified-engine/pull/79}
+ *
+ * {@link https://app.unpkg.com/unified-engine@11.2.2/files/lib/ignore.d.ts}
+ */
+
+export declare class Ignore {
+  constructor(options: Options)
+  check(filePath: string, callback: Callback): void
+}
+
+export type IgnoreClass = typeof Ignore
+
+export type Callback = (error?: Error, result?: boolean) => void
+
+export interface Options {
+  /**
+   *   Base.
+   */
+  cwd: string
+  /**
+   *   Whether to detect ignore files.
+   */
+  detectIgnore: boolean | undefined
+  /**
+   *   Basename of ignore files.
+   */
+  ignoreName?: string
+}

Diff for: packages/eslint-mdx/src/worker.ts

@@ -53,6 +53,7 @@ import {
 import { restoreTokens } from './tokens.ts'
 import type {
   Arrayable,
+  IgnoreClass,
   MDXCode,
   MDXHeading,
   NormalPosition,
@@ -73,18 +74,51 @@ export const processorCache = new Map<
   Processor<Root, undefined, undefined, Root, string>
 >()
 
-let configLoad: (filePath: string) => Promise<ConfigResult>
+const configLoadCache = new Map<
+  string,
+  (filePath: string) => Promise<ConfigResult>
+>()
+
+let Ignore: IgnoreClass
+
+const ignoreCheckCache = new Map<
+  string,
+  (filePath: string) => Promise<boolean>
+>()
+
+const getRemarkConfig = async (filePath: string, cwd = process.cwd()) => {
+  let configLoad = configLoadCache.get(cwd)
 
-const getRemarkConfig = async (filePath: string) => {
   if (!configLoad) {
     const config = new Configuration({
-      cwd: process.cwd(),
+      cwd,
       packageField: 'remarkConfig',
       pluginPrefix: 'remark',
       rcName: '.remarkrc',
       detectConfig: true,
     })
     configLoad = promisify(config.load.bind(config))
+    configLoadCache.set(cwd, configLoad)
+  }
+
+  if (!Ignore) {
+    ;({ Ignore } = (await import(
+      pathToFileURL(
+        path.resolve(cjsRequire.resolve('unified-engine'), '../lib/ignore.js'),
+      ).href
+    )) as { Ignore: IgnoreClass })
+  }
+
+  let ignoreCheck = ignoreCheckCache.get(cwd)
+
+  if (!ignoreCheck) {
+    const ignore = new Ignore({
+      cwd,
+      ignoreName: '.remarkignore',
+      detectIgnore: true,
+    })
+    ignoreCheck = promisify(ignore.check.bind(ignore))
+    ignoreCheckCache.set(cwd, ignoreCheck)
   }
 
   return configLoad(filePath)
@@ -216,6 +250,12 @@ runAsWorker(
     }
 
     if (process) {
+      if (await ignoreCheckCache.get(cwd)(filePath)) {
+        return {
+          messages: [],
+        }
+      }
+
       const file = new VFile(fileOptions)
       try {
         await processor.process(file)