Update to ESLint 9's "flat" configuration file format.

eslint.config.mjs

@@ -0,0 +1,138 @@
+import js from "@eslint/js";
+import eslintPluginJsdoc from "eslint-plugin-jsdoc";
+import eslintPluginNode from "eslint-plugin-n";
+import eslintPluginRegexp from "eslint-plugin-regexp"
+import eslintPluginUnicorn from "eslint-plugin-unicorn";
+
+export default [
+  js.configs.all,
+  eslintPluginJsdoc.configs['flat/recommended'],
+  eslintPluginNode.configs["flat/recommended"],
+  eslintPluginRegexp.configs["flat/recommended"],
+  eslintPluginUnicorn.configs["flat/all"],
+  {
+    "ignores": [
+      "demo/markdown-it.min.js",
+      "demo/markdownlint-browser.js",
+      "demo/markdownlint-browser.min.js",
+      "demo/micromark-browser.js",
+      "demo/micromark-html-browser.js",
+      "example/typescript/type-check.js",
+      "micromark/micromark.cjs",
+      "micromark/micromark.dev.cjs",
+      "micromark/micromark-browser.js",
+      "micromark/micromark-browser.dev.js",
+      "test-repos/**"
+    ]
+  },
+  {
+    "languageOptions": {
+      "sourceType": "commonjs",
+    },
+    "linterOptions": {
+      "reportUnusedDisableDirectives": true
+    },
+    "rules": {
+      "capitalized-comments": "off",
+      "complexity": "off",
+      "func-style": "off",
+      "id-length": "off",
+      "jsdoc/tag-lines": [ "error", "never", { "startLines":1 } ],
+      "logical-assignment-operators": "off",
+      "max-depth": "off",
+      "max-lines-per-function": "off",
+      "max-lines": "off",
+      "max-params": "off",
+      "max-statements": "off",
+      "multiline-comment-style": [ "error", "separate-lines" ],
+      "no-empty-function": "off",
+      "no-implicit-coercion": "off",
+      "no-magic-numbers": "off",
+      "no-param-reassign": "off",
+      "no-plusplus": "off",
+      "no-ternary": "off",
+      "no-undefined": "off",
+      "no-useless-assignment": "off",
+      "object-shorthand": "off",
+      "one-var": "off",
+      "prefer-arrow-callback": "off",
+      "prefer-destructuring": "off",
+      "prefer-named-capture-group": "off",
+      "prefer-template": "off",
+      "regexp/no-super-linear-backtracking": "off",
+      "require-unicode-regexp": "off",
+      "sort-imports": "off",
+      "sort-keys": "off",
+      "unicorn/better-regex": "off",
+      "unicorn/consistent-function-scoping": "off",
+      "unicorn/filename-case": "off",
+      "unicorn/no-array-callback-reference": "off",
+      "unicorn/no-keyword-prefix": "off",
+      "unicorn/no-new-array": "off",
+      "unicorn/no-null": "off",
+      "unicorn/no-useless-undefined": "off",
+      "unicorn/prefer-at": "off",
+      "unicorn/prefer-module": "off",
+      "unicorn/prefer-string-replace-all": "off",
+      "unicorn/prefer-string-slice": "off",
+      "unicorn/prefer-switch": "off",
+      "unicorn/prevent-abbreviations": "off",
+      "unicorn/switch-case-braces": [ "error", "avoid" ],
+      "vars-on-top": "off"
+    },
+    "settings": {
+      "jsdoc": {
+        "preferredTypes": {
+          "object": "Object"
+        }
+      }
+    }
+  },
+  {
+    "files": [
+      "**/*.mjs"
+    ],
+    "languageOptions": {
+      "sourceType": "module"
+    }
+  },
+  {
+    "files": [
+      "demo/*.js"
+    ],
+    "languageOptions": {
+      "globals": {
+        "alert": "readonly",
+        "document": "readonly",
+        "navigator": "readonly",
+        "window": "readonly"
+      }
+    },
+    "rules": {
+      "jsdoc/require-jsdoc": "off",
+      "no-invalid-this": "off",
+      "no-shadow": "off",
+      "no-var": "off",
+      "unicorn/prefer-query-selector": "off"
+    }
+  },
+  {
+    "files": [
+      "example/*.js"
+    ],
+    "rules": {
+      "n/no-missing-require": "off",
+      "no-console": "off",
+      "no-invalid-this": "off",
+      "no-shadow": "off"
+    }
+  },
+  {
+    "files": [
+      "test/rules/**/*.js"
+    ],
+    "rules": {
+      "jsdoc/valid-types": "off"
+    }
+  }
+];