Migrate to eslint.config.mjs

`.eslintrc.json` is deprecated.

eslint.config.mjs

@@ -0,0 +1,116 @@
+// Automatically generated by running npx @eslint/migrate-config .eslintrc.json
+
+import { fixupConfigRules, fixupPluginRules } from "@eslint/compat";
+import typescriptEslint from "@typescript-eslint/eslint-plugin";
+import filenames from "eslint-plugin-filenames";
+import github from "eslint-plugin-github";
+import _import from "eslint-plugin-import";
+import noAsyncForeach from "eslint-plugin-no-async-foreach";
+import tsParser from "@typescript-eslint/parser";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import js from "@eslint/js";
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+    baseDirectory: __dirname,
+    recommendedConfig: js.configs.recommended,
+    allConfig: js.configs.all
+});
+
+export default [{
+    ignores: ["**/webpack.config.js", "lib/**/*", "src/testdata/**/*", "tests/**/*"],
+}, ...fixupConfigRules(compat.extends(
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:@typescript-eslint/recommended-requiring-type-checking",
+    "plugin:github/recommended",
+    "plugin:github/typescript",
+    "plugin:import/typescript",
+)), {
+    plugins: {
+        "@typescript-eslint": fixupPluginRules(typescriptEslint),
+        filenames,
+        github: fixupPluginRules(github),
+        import: fixupPluginRules(_import),
+        "no-async-foreach": noAsyncForeach,
+    },
+
+    languageOptions: {
+        parser: tsParser,
+        ecmaVersion: 5,
+        sourceType: "script",
+
+        parserOptions: {
+            project: "./tsconfig.json",
+        },
+    },
+
+    settings: {
+        "import/resolver": {
+            node: {
+                moduleDirectory: ["node_modules", "src"],
+            },
+
+            typescript: {},
+        },
+    },
+
+    rules: {
+        "filenames/match-regex": ["error", "^[a-z0-9-]+(\\.test)?$"],
+        "i18n-text/no-en": "off",
+
+        "import/extensions": ["error", {
+            json: {},
+        }],
+
+        "import/no-amd": "error",
+        "import/no-commonjs": "error",
+        "import/no-cycle": "error",
+        "import/no-dynamic-require": "error",
+
+        "import/no-extraneous-dependencies": ["error", {
+            devDependencies: true,
+        }],
+
+        "import/no-namespace": "off",
+        "import/no-unresolved": "error",
+        "import/no-webpack-loader-syntax": "error",
+
+        "import/order": ["error", {
+            alphabetize: {
+                order: "asc",
+            },
+
+            "newlines-between": "always",
+        }],
+
+        "max-len": ["error", {
+            code: 120,
+            ignoreUrls: true,
+            ignoreStrings: true,
+            ignoreTemplateLiterals: true,
+        }],
+
+        "no-async-foreach/no-async-foreach": "error",
+        "no-sequences": "error",
+        "no-shadow": "off",
+        "@typescript-eslint/no-shadow": "error",
+        "one-var": ["error", "never"],
+    },
+}, {
+    files: ["**"],
+
+    rules: {
+        "@typescript-eslint/no-explicit-any": "off",
+        "@typescript-eslint/no-unsafe-assignment": "off",
+        "@typescript-eslint/no-unsafe-member-access": "off",
+        "@typescript-eslint/no-var-requires": "off",
+        "@typescript-eslint/prefer-regexp-exec": "off",
+        "@typescript-eslint/require-await": "off",
+        "@typescript-eslint/restrict-template-expressions": "off",
+        "func-style": "off",
+    },
+}];