From 88bbcf4bdd305994329a6b202474e2cc898c9cd8 Mon Sep 17 00:00:00 2001
From: Andrew Clark <acdlite@fb.com>
Date: Mon, 2 Apr 2018 17:17:39 -0700
Subject: [PATCH] Extract throw to separate function so performUnitOfWork does
 not deopt

Only affects DEV mode, but still important I think.
---
 packages/react-reconciler/src/ReactFiberScheduler.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/react-reconciler/src/ReactFiberScheduler.js b/packages/react-reconciler/src/ReactFiberScheduler.js
index abd17a5979392..47fd98f69b65d 100644
--- a/packages/react-reconciler/src/ReactFiberScheduler.js
+++ b/packages/react-reconciler/src/ReactFiberScheduler.js
@@ -265,6 +265,7 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
   let replayUnitOfWork;
   let isReplayingFailedUnitOfWork;
   let originalReplayError;
+  let rethrowOriginalError;
   if (__DEV__ && replayFailedUnitOfWorkWithInvokeGuardedCallback) {
     stashedWorkInProgressProperties = null;
     isReplayingFailedUnitOfWork = false;
@@ -311,6 +312,9 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
         nextUnitOfWork = failedUnitOfWork;
       }
     };
+    rethrowOriginalError = () => {
+      throw originalReplayError;
+    };
   }
 
   function resetStack() {
@@ -875,7 +879,7 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
         // because the render phase is meant to be idempotent, and it should
         // have thrown again. Since it didn't, rethrow the original error, so
         // React's internal stack is not misaligned.
-        throw originalReplayError;
+        rethrowOriginalError();
       }
     }
     if (__DEV__ && ReactFiberInstrumentation.debugTool) {