From 8599a62968f404d7ee36297ddff15bb8893b8fe6 Mon Sep 17 00:00:00 2001
From: Brian Vaughn <bvaughn@fb.com>
Date: Mon, 3 Dec 2018 10:14:59 -0800
Subject: [PATCH] Fix scheduler setTimeout() re-entrancy check

---
 packages/scheduler/src/Scheduler.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/packages/scheduler/src/Scheduler.js b/packages/scheduler/src/Scheduler.js
index 90e33a70dce..6d310896e18 100644
--- a/packages/scheduler/src/Scheduler.js
+++ b/packages/scheduler/src/Scheduler.js
@@ -473,9 +473,11 @@ if (globalValue && globalValue._schedMock) {
   var _callback = null;
   var _flushCallback = function(didTimeout) {
     if (_callback !== null) {
-      var cb = _callback;
-      _callback = null;
-      cb(didTimeout);
+      try {
+        _callback(didTimeout);
+      } finally {
+        _callback = null;
+      }
     }
   };
   requestHostCallback = function(cb, ms) {