ESLint 9.x

eslint.config.cjs

@@ -0,0 +1,40 @@
+const globals = require('globals');
+const js = require('@eslint/js');
+
+const { FlatCompat } = require('@eslint/eslintrc');
+
+const compat = new FlatCompat({
+    baseDirectory: __dirname,
+    recommendedConfig: js.configs.recommended,
+    allConfig: js.configs.all,
+});
+
+module.exports = [
+    {
+        ignores: ['.dev-server/**', '**/.eslintrc.js'],
+    },
+    ...compat.extends('eslint:recommended', 'plugin:prettier/recommended'),
+    {
+        languageOptions: {
+            globals: {
+                ...globals.node,
+                ...globals.mocha,
+            },
+
+            ecmaVersion: 2022,
+            sourceType: 'commonjs',
+
+            parserOptions: {
+                ecmaFeatures: {
+                    jsx: true,
+                },
+            },
+        },
+
+        rules: {
+            'no-console': 'off',
+            'no-var': 'error',
+            'prefer-const': 'error',
+        },
+    },
+];