updated to ESLint 9

Author: dg

.eslintrc.js

@@ -1,3 +1,5 @@
 /vendor
 /composer.lock
+/node_modules
+/package-lock.json
 /tools/create-phar/tracy.phar

.gitignore

@@ -0,0 +1,21 @@
+import globals from 'globals';
+import pluginJs from '@eslint/js';
+
+export default [
+	pluginJs.configs.recommended,
+	{
+		languageOptions: {
+			ecmaVersion: 'latest',
+			globals: globals.browser,
+		},
+		rules: {
+			indent: ['error', 'tab'],
+			quotes: ['error', 'single'],
+			semi: ['error', 'always'],
+			'prefer-arrow-callback': ['error'],
+			'arrow-parens': ['error'],
+			'arrow-spacing': ['error'],
+			'no-var': ['error'],
+		},
+	},
+];

eslint.config.mjs

@@ -0,0 +1,7 @@
+{
+	"devDependencies": {
+		"@eslint/js": "^9.1.1",
+		"eslint": "^9.1.1",
+		"globals": "^15.1.0"
+	}
+}