fix(compiler-core): generate TS-cast safe assignment code for v-model

fix #4655

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

@@ -76,9 +76,9 @@ export const transformModel: DirectiveTransform = (dir, node, context) => {
     if (bindingType === BindingTypes.SETUP_REF) {
       // v-model used on known ref.
       assignmentExp = createCompoundExpression([
-        `${eventArg} => (`,
+        `${eventArg} => ((`,
         createSimpleExpression(rawExp, false, exp.loc),
-        `.value = $event)`
+        `).value = $event)`
       ])
     } else {
       // v-model used on a potentially ref binding in <script setup> inline mode.
@@ -86,16 +86,16 @@ export const transformModel: DirectiveTransform = (dir, node, context) => {
       const altAssignment =
         bindingType === BindingTypes.SETUP_LET ? `${rawExp} = $event` : `null`
       assignmentExp = createCompoundExpression([
-        `${eventArg} => (${context.helperString(IS_REF)}(${rawExp}) ? `,
+        `${eventArg} => (${context.helperString(IS_REF)}(${rawExp}) ? (`,
         createSimpleExpression(rawExp, false, exp.loc),
-        `.value = $event : ${altAssignment})`
+        `).value = $event : ${altAssignment})`
       ])
     }
   } else {
     assignmentExp = createCompoundExpression([
-      `${eventArg} => (`,
+      `${eventArg} => ((`,
       exp,
-      ` = $event)`
+      `) = $event)`
     ])
   }