update eslint config to 9.x mjs

Author: nonrational

.eslintrc.js

@@ -0,0 +1,21 @@
+import js from '@eslint/js'
+import globals from 'globals'
+
+const OFF = 0,
+  WARN = 1,
+  ERROR = 2
+
+export default [
+  js.configs.recommended,
+  {
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+      globals: globals.node
+    },
+    rules: {
+      'semi': [ERROR, 'never'],
+      'no-debugger': process.env.NODE_ENV === 'development' ? OFF : ERROR,
+    },
+  },
+]