From d6a0626b38de863a447b7e2e1346216a226cdfe1 Mon Sep 17 00:00:00 2001
From: Dan Abramov <dan.abramov@gmail.com>
Date: Tue, 17 Jul 2018 01:11:56 +0100
Subject: [PATCH] Set current fiber during before-mutation traversal (#13219)

---
 packages/react-reconciler/src/ReactFiberScheduler.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/packages/react-reconciler/src/ReactFiberScheduler.js b/packages/react-reconciler/src/ReactFiberScheduler.js
index 2bf21ab1b2..72f2022c6d 100644
--- a/packages/react-reconciler/src/ReactFiberScheduler.js
+++ b/packages/react-reconciler/src/ReactFiberScheduler.js
@@ -428,8 +428,11 @@ function commitAllHostEffects() {
 
 function commitBeforeMutationLifecycles() {
   while (nextEffect !== null) {
-    const effectTag = nextEffect.effectTag;
+    if (__DEV__) {
+      ReactCurrentFiber.setCurrentFiber(nextEffect);
+    }
 
+    const effectTag = nextEffect.effectTag;
     if (effectTag & Snapshot) {
       recordEffect();
       const current = nextEffect.alternate;
@@ -440,6 +443,10 @@ function commitBeforeMutationLifecycles() {
     // This will be done by commitAllLifeCycles()
     nextEffect = nextEffect.nextEffect;
   }
+
+  if (__DEV__) {
+    ReactCurrentFiber.resetCurrentFiber();
+  }
 }
 
 function commitAllLifeCycles(