From 32b51249bff70d1e03a3f9193f5a42461974daa6 Mon Sep 17 00:00:00 2001
From: Julian Meinking <12785972+DrJume@users.noreply.github.com>
Date: Wed, 26 Oct 2022 11:54:10 +0200
Subject: [PATCH] fix(runtime-core): `in` operator returning `false` for
 built-in instance properties in `exposeProxy` (#6138)

fix #6137
---
 packages/runtime-core/__tests__/apiExpose.spec.ts | 7 ++++++-
 packages/runtime-core/src/component.ts            | 3 +++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/packages/runtime-core/__tests__/apiExpose.spec.ts b/packages/runtime-core/__tests__/apiExpose.spec.ts
index 1235096b016..1bfd513943b 100644
--- a/packages/runtime-core/__tests__/apiExpose.spec.ts
+++ b/packages/runtime-core/__tests__/apiExpose.spec.ts
@@ -203,7 +203,9 @@ describe('api: expose', () => {
         return h('div')
       },
       setup(_, { expose }) {
-        expose()
+        expose({
+          foo: 42
+        })
         return () => h(GrandChild, { ref: grandChildRef })
       }
     })
@@ -216,7 +218,10 @@ describe('api: expose', () => {
     }
     const root = nodeOps.createElement('div')
     render(h(Parent), root)
+    expect('$el' in childRef.value).toBe(true)
     expect(childRef.value.$el.tag).toBe('div')
+    expect('foo' in childRef.value).toBe(true)
+    expect('$parent' in grandChildRef.value).toBe(true)
     expect(grandChildRef.value.$parent).toBe(childRef.value)
     expect(grandChildRef.value.$parent.$parent).toBe(grandChildRef.value.$root)
   })
diff --git a/packages/runtime-core/src/component.ts b/packages/runtime-core/src/component.ts
index c70a6f87411..68f10a669b3 100644
--- a/packages/runtime-core/src/component.ts
+++ b/packages/runtime-core/src/component.ts
@@ -945,6 +945,9 @@ export function getExposeProxy(instance: ComponentInternalInstance) {
           } else if (key in publicPropertiesMap) {
             return publicPropertiesMap[key](instance)
           }
+        },
+        has(target, key: string) {
+          return key in target || key in publicPropertiesMap
         }
       }))
     )