From 743b4b74fc88e51e9032cfe79aad42dfcd53d5de Mon Sep 17 00:00:00 2001
From: Che Guevara <836934184@qq.com>
Date: Fri, 22 Oct 2021 13:33:44 +0800
Subject: [PATCH 1/2] fix(devtools): fix memory leak when devtools is not
 installed

---
 packages/runtime-core/src/devtools.ts | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/packages/runtime-core/src/devtools.ts b/packages/runtime-core/src/devtools.ts
index b5cbe30608a..ee02ea9e550 100644
--- a/packages/runtime-core/src/devtools.ts
+++ b/packages/runtime-core/src/devtools.ts
@@ -33,8 +33,12 @@ export let devtools: DevtoolsHook
 
 let buffer: { event: string; args: any[] }[] = []
 
+let devtoolsNotInstalled = false
+
 function emit(event: string, ...args: any[]) {
-  if (devtools) {
+  if (devtoolsNotInstalled) {
+    buffer = []
+  } else if (devtools) {
     devtools.emit(event, ...args)
   } else {
     buffer.push({ event, args })
@@ -56,7 +60,10 @@ export function setDevtoolsHook(hook: DevtoolsHook, target: any) {
     // clear buffer after 3s - the user probably doesn't have devtools installed
     // at all, and keeping the buffer will cause memory leaks (#4738)
     setTimeout(() => {
-      buffer = []
+      if (!devtools) {
+        devtoolsNotInstalled = true
+        buffer = []
+      }
     }, 3000)
   }
 }

From fece465d0ebfefed0726c57af7767528482aa235 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Mon, 1 Nov 2021 23:14:31 -0400
Subject: [PATCH 2/2] Update devtools.ts

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

diff --git a/packages/runtime-core/src/devtools.ts b/packages/runtime-core/src/devtools.ts
index ee02ea9e550..2e09a2e24a1 100644
--- a/packages/runtime-core/src/devtools.ts
+++ b/packages/runtime-core/src/devtools.ts
@@ -36,11 +36,9 @@ let buffer: { event: string; args: any[] }[] = []
 let devtoolsNotInstalled = false
 
 function emit(event: string, ...args: any[]) {
-  if (devtoolsNotInstalled) {
-    buffer = []
-  } else if (devtools) {
+  if (devtools) {
     devtools.emit(event, ...args)
-  } else {
+  } else if (!devtoolsNotInstalled) {
     buffer.push({ event, args })
   }
 }