feat(compiler-core/v-model): error when v-model is used on scope variable

packages/compiler-core/src/transforms/vModel.ts

@@ -9,7 +9,7 @@ import {
   createInterpolation
 } from '../ast'
 import { createCompilerError, ErrorCodes } from '../errors'
-import { isMemberExpression } from '../utils'
+import { isMemberExpression, isSimpleIdentifier } from '../utils'
 import { isObject } from '@vue/shared'
 
 export const transformModel: DirectiveTransform = (dir, node, context) => {
@@ -30,6 +30,18 @@ export const transformModel: DirectiveTransform = (dir, node, context) => {
     return createTransformProps()
   }
 
+  if (
+    !__BROWSER__ &&
+    context.prefixIdentifiers &&
+    isSimpleIdentifier(expString) &&
+    context.identifiers[expString]
+  ) {
+    context.onError(
+      createCompilerError(ErrorCodes.X_V_MODEL_ON_SCOPE_VARIABLE, exp.loc)
+    )
+    return createTransformProps()
+  }
+
   const propName = arg ? arg : createSimpleExpression('modelValue', true)
   const eventName = arg
     ? arg.type === NodeTypes.SIMPLE_EXPRESSION && arg.isStatic