From d79c6ab995cc28868fd44ae46a792d624cb73edc Mon Sep 17 00:00:00 2001
From: Ben Alpert <ben@benalpert.com>
Date: Mon, 6 Mar 2017 16:21:43 -0800
Subject: [PATCH] Fiber DOM async feature flag (#9127)

D4662171
---
 src/renderers/dom/fiber/ReactDOMFiber.js            | 2 +-
 src/renderers/dom/shared/ReactDOMFeatureFlags.js    | 1 +
 src/renderers/shared/shared/event/EventPluginHub.js | 9 ++++++---
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/renderers/dom/fiber/ReactDOMFiber.js b/src/renderers/dom/fiber/ReactDOMFiber.js
index cd0988f512..f1f61f1eb4 100644
--- a/src/renderers/dom/fiber/ReactDOMFiber.js
+++ b/src/renderers/dom/fiber/ReactDOMFiber.js
@@ -330,7 +330,7 @@ var DOMRenderer = ReactFiberReconciler({
 
   scheduleDeferredCallback: ReactDOMFrameScheduling.rIC,
 
-  useSyncScheduling: true,
+  useSyncScheduling: !ReactDOMFeatureFlags.fiberAsyncScheduling,
 
 });
 
diff --git a/src/renderers/dom/shared/ReactDOMFeatureFlags.js b/src/renderers/dom/shared/ReactDOMFeatureFlags.js
index 5e9d93267c..a53cc0dff5 100644
--- a/src/renderers/dom/shared/ReactDOMFeatureFlags.js
+++ b/src/renderers/dom/shared/ReactDOMFeatureFlags.js
@@ -12,6 +12,7 @@
 'use strict';
 
 var ReactDOMFeatureFlags = {
+  fiberAsyncScheduling: false,
   useCreateElement: true,
   useFiber: false,
 };
diff --git a/src/renderers/shared/shared/event/EventPluginHub.js b/src/renderers/shared/shared/event/EventPluginHub.js
index 6c4235ea42..179e89d651 100644
--- a/src/renderers/shared/shared/event/EventPluginHub.js
+++ b/src/renderers/shared/shared/event/EventPluginHub.js
@@ -126,9 +126,12 @@ var EventPluginHub = {
     // TODO: shouldPreventMouseEvent is DOM-specific and definitely should not
     // live here; needs to be moved to a better place soon
     if (typeof inst.tag === 'number') {
-      const props = EventPluginUtils.getFiberCurrentPropsFromNode(
-        inst.stateNode
-      );
+      const stateNode = inst.stateNode;
+      if (!stateNode) {
+        // Work in progress (ex: onload events in incremental mode).
+        return null;
+      }
+      const props = EventPluginUtils.getFiberCurrentPropsFromNode(stateNode);
       if (!props) {
         // Work in progress.
         return null;