From 0e9cb3f5d0bfd4fe08ac8fcfba71302559614282 Mon Sep 17 00:00:00 2001
From: Dominic Gannaway <trueadm@users.noreply.github.com>
Date: Mon, 19 Nov 2018 16:09:11 +0000
Subject: [PATCH] Clear fields on unmount of fiber to avoid memory leak
 (#14276)

* Clear fields on unmount of fiber to avoid memory leak
---
 packages/react-reconciler/src/ReactFiberCommitWork.js | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.js b/packages/react-reconciler/src/ReactFiberCommitWork.js
index 55a39ee640..2594e94895 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.js
@@ -728,9 +728,14 @@ function detachFiber(current: Fiber) {
   // itself will be GC:ed when the parent updates the next time.
   current.return = null;
   current.child = null;
-  if (current.alternate) {
-    current.alternate.child = null;
-    current.alternate.return = null;
+  current.memoizedState = null;
+  current.updateQueue = null;
+  const alternate = current.alternate;
+  if (alternate !== null) {
+    alternate.return = null;
+    alternate.child = null;
+    alternate.memoizedState = null;
+    alternate.updateQueue = null;
   }
 }