refactor: migrate ESLint to 9.x

Author: mrholek

.eslintignore

@@ -0,0 +1,23 @@
+import eslintPluginVue from 'eslint-plugin-vue'
+import globals from 'globals'
+
+export default [
+  { ignores: ['dist/', 'eslint.config.mjs'] },
+  ...eslintPluginVue.configs['flat/essential'],
+  {
+    files: ['src/**/*.{js,vue}'],
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+      },
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+    },
+    rules: {
+      'no-console': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
+      'no-debugger': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
+      'vue/multi-word-component-names': 'off',
+    },
+  },
+]

.eslintrc.cjs

@@ -14,7 +14,7 @@
   "scripts": {
     "dev": "vite --force",
     "build": "vite build",
-    "lint": "eslint \"src/**/*.{js,vue}\"",
+    "lint": "eslint",
     "preview": "vite preview"
   },
   "dependencies": {
@@ -35,8 +35,9 @@
   "devDependencies": {
     "@vitejs/plugin-vue": "^5.2.0",
     "autoprefixer": "^10.4.20",
-    "eslint": "^8.57.0",
-    "eslint-plugin-vue": "^9.31.0",
+    "eslint": "^9.20.1",
+    "eslint-plugin-vue": "^9.32.0",
+    "globals": "^15.15.0",
     "postcss": "^8.4.49",
     "sass": "^1.81.0",
     "vite": "^5.4.11"