From 11f38d8a853b2d8043212c17612b63df92322de4 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Fri, 1 May 2020 13:24:38 -0400
Subject: [PATCH] perf: instance public proxy should never be observed

---
 packages/runtime-core/src/component.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/runtime-core/src/component.ts b/packages/runtime-core/src/component.ts
index dd1bf62c..1c9b17ba 100644
--- a/packages/runtime-core/src/component.ts
+++ b/packages/runtime-core/src/component.ts
@@ -4,7 +4,8 @@ import {
   ReactiveEffect,
   pauseTracking,
   resetTracking,
-  shallowReadonly
+  shallowReadonly,
+  markRaw
 } from '@vue/reactivity'
 import {
   ComponentPublicInstance,
@@ -462,7 +463,8 @@ function setupStatefulComponent(
   // 0. create render proxy property access cache
   instance.accessCache = {}
   // 1. create public instance / render proxy
-  instance.proxy = new Proxy(instance.ctx, PublicInstanceProxyHandlers)
+  // also mark it raw so it's never observed
+  instance.proxy = markRaw(new Proxy(instance.ctx, PublicInstanceProxyHandlers))
   if (__DEV__) {
     exposePropsOnRenderContext(instance)
   }