ui_migration fix(deps): VUE3 migration goal_1, updated and detailed lint checks for vue compat mode.

webapp/.eslintrc.js

@@ -1,23 +1,51 @@
 module.exports = {
   root: true,
-
   env: {
     node: true,
+    es2021: true,  // ✅ Updated for modern JS
   },
-
   parser: "vue-eslint-parser",
-
   parserOptions: {
     parser: "@babel/eslint-parser",
     requireConfigFile: false,
-    ecmaVersion: 2020,
+    ecmaVersion: 2021,  // ✅ Updated
     sourceType: "module",
   },
-
-  extends: ["plugin:vue/recommended", "eslint:recommended", "@vue/prettier"],
-
+  extends: [
+    "plugin:vue/vue3-recommended",  // ✅ Changed from vue/recommended to vue3-recommended
+    "eslint:recommended", 
+    "@vue/prettier"
+  ],
   rules: {
     "no-console": process.env.NODE_ENV === "production" ? "warn" : "off",
     "no-debugger": process.env.NODE_ENV === "production" ? "warn" : "off",
+    
+    // ✅ Vue 3 migration warnings - detect deprecated patterns
+    "vue/no-deprecated-slot-attribute": "warn",
+    "vue/no-deprecated-v-on-native-modifier": "warn",
+    "vue/no-deprecated-dollar-listeners-api": "warn",
+    "vue/no-deprecated-destroyed-lifecycle": "warn",
+    "vue/no-deprecated-dollar-scopedslots-api": "warn",
+    "vue/no-deprecated-events-api": "warn",
+    "vue/no-deprecated-filter": "warn",
+    "vue/no-deprecated-functional-template": "warn",
+    "vue/no-deprecated-html-element-is": "warn",
+    "vue/no-deprecated-inline-template": "warn",
+    "vue/no-deprecated-props-default-this": "warn",
+    "vue/no-deprecated-scope-attribute": "warn",
+    "vue/no-deprecated-v-bind-sync": "warn",
+    "vue/no-deprecated-v-is": "warn",
+    "vue/no-lifecycle-after-await": "warn",
+    "vue/no-watch-after-await": "warn",
+    
+    // ✅ Vue 3 best practices
+    "vue/require-explicit-emits": "warn",  // Require emits declaration
+    "vue/multi-word-component-names": "warn",  // Component naming
+    "vue/no-v-for-template-key-on-child": "error",  // Key placement
+    "vue/no-v-model-argument": "off",  // Allow v-model arguments (Vue 3 feature)
+    
+    // ✅ Relaxed for migration period (can be stricter later)
+    "vue/no-unused-components": "warn",
+    "vue/no-unused-vars": "warn",
   },
-};
+};