feat!: bump with mdast-util-from-markdown with synckit

close eslint#218

eslint.config.js

@@ -3,8 +3,19 @@
 module.exports = [
  ...require("eslint-config-eslint/cjs").map(config => ({
  ...config,
- files: ["**/*.js"]
+ files: ["**/*.js", "**/*.mjs"]
  })),
+ {
+ files: ["**/*.mjs"],
+ languageOptions: {
+ sourceType: "module",
+ parserOptions: {
+ ecmaFeatures: {
+ impliedStrict: true
+ }
+ }
+ }
+ },
  {
  plugins: {
  markdown: require(".")

lib/processor.js

@@ -27,9 +27,12 @@
 
 "use strict";
 
-const parse = require("mdast-util-from-markdown");
+const { createSyncFn } = require("synckit");
+
 const pkg = require("../package.json");
 
+const parse = createSyncFn(require.resolve("./worker.mjs"));
+
 const UNSATISFIABLE_RULES = new Set([
  "eol-last", // The Markdown parser strips trailing newlines in code fences
  "unicode-bom" // Code blocks will begin in the middle of Markdown files

lib/worker.mjs

@@ -0,0 +1,4 @@
+import { fromMarkdown } from "mdast-util-from-markdown";
+import { runAsWorker } from "synckit";
+
+runAsWorker(fromMarkdown);

package.json

@@ -33,7 +33,8 @@
  "files": [
  "index.js",
  "lib/index.js",
- "lib/processor.js"
+ "lib/processor.js",
+ "lib/worker.mjs"
  ],
  "devDependencies": {
  "@eslint/js": "^8.56.0",
@@ -46,7 +47,8 @@
  "nyc": "^14.1.1"
  },
  "dependencies": {
- "mdast-util-from-markdown": "^0.8.5"
+ "mdast-util-from-markdown": "^2.0.0",
+ "synckit": "^0.9.0"
  },
  "peerDependencies": {
  "eslint": ">=8"