Various improvement

eslint.config.js

@@ -0,0 +1,25 @@
+const pluginVue = require('eslint-plugin-vue')
+const js = require('@eslint/js')
+const globals = require('globals')
+const babelParser = require('@babel/eslint-parser')
+
+module.exports = [
+  ...pluginVue.configs['flat/essential'],
+  js.configs.recommended,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+        config: 'readonly',
+      },
+      parserOptions: {
+        parser: babelParser,
+        requireConfigFile: false,
+      },
+    },
+    rules: {
+      'vue/valid-v-slot': ['error', { allowModifiers: true }],
+    },
+  },
+]