Upgrade eslint

eslint.config.mjs

@@ -0,0 +1,46 @@
+import globals from "globals";
+import babelParser from "@babel/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 [...compat.extends("eslint:recommended"), {
+    languageOptions: {
+        globals: {
+            ...globals.browser,
+            Atomics: "readonly",
+            SharedArrayBuffer: "readonly",
+            module: true,
+            require: true,
+            process: true,
+            __dirname: true,
+            describe: true,
+            it: true,
+            globalThis: true,
+            beforeEach: true,
+            app: true,
+            Tablesort: true,
+        },
+
+        parser: babelParser,
+        ecmaVersion: 2018,
+        sourceType: "module",
+
+        parserOptions: {
+            requireConfigFile: false,
+        },
+    },
+
+    rules: {
+        indent: "off",
+    },
+}];

package.json

@@ -68,9 +68,12 @@
   "devDependencies": {
     "@babel/core": "^7.23.2",
     "@babel/eslint-parser": "^7.22.15",
+    "@eslint/eslintrc": "^3.1.0",
+    "@eslint/js": "^9.9.1",
     "adm-zip": "^0.5.10",
     "diff": "^5.0.0",
     "eslint": "^9.0.0",
+    "globals": "^15.9.0",
     "handlebars": "^4.7.8",
     "mocha": "^10.2.0",
     "npm-run-all2": "^6.0.0",