Track currently replaying event (#22853)

* Track currently replaying event

Co-authored-by: Dan Abramov <dan.abramov@me.com>

* Add warnings

Co-authored-by: Marco Salazar <salazarm@fb.com>

packages/react-dom/src/events/CurrentReplayingEvent.js

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+import type {AnyNativeEvent} from '../events/PluginModuleType';
+
+// This exists to avoid circular dependency between ReactDOMEventReplaying
+// and DOMPluginEventSystem.
+
+let currentReplayingEvent = null;
+
+export function setReplayingEvent(event: AnyNativeEvent): void {
+  if (__DEV__) {
+    if (currentReplayingEvent !== null) {
+      console.error(
+        'Expected currently replaying event to be null. This error ' +
+          'is likely caused by a bug in React. Please file an issue.',
+      );
+    }
+  }
+  currentReplayingEvent = event;
+}
+
+export function resetReplayingEvent(): void {
+  if (__DEV__) {
+    if (currentReplayingEvent === null) {
+      console.error(
+        'Expected currently replaying event to not be null. This error ' +
+          'is likely caused by a bug in React. Please file an issue.',
+      );
+    }
+  }
+  currentReplayingEvent = null;
+}
+
+export function isReplayingEvent(event: AnyNativeEvent): boolean {
+  return event === currentReplayingEvent;
+}

packages/react-dom/src/events/DOMPluginEventSystem.js

@@ -27,6 +27,7 @@ import {
   IS_EVENT_HANDLE_NON_MANAGED_NODE,
   IS_NON_DELEGATED,
 } from './EventSystemFlags';
+import {isReplayingEvent} from './CurrentReplayingEvent';
 
 import {
   HostRoot,
@@ -557,7 +558,8 @@ export function dispatchEventForPluginEventSystem(
       // for legacy FB support, where the expected behavior was to
       // match React < 16 behavior of delegated clicks to the doc.
       domEventName === 'click' &&
-      (eventSystemFlags & SHOULD_NOT_DEFER_CLICK_FOR_FB_SUPPORT_MODE) === 0
+      (eventSystemFlags & SHOULD_NOT_DEFER_CLICK_FOR_FB_SUPPORT_MODE) === 0 &&
+      !isReplayingEvent(nativeEvent)
     ) {
       deferClickToDocumentForLegacyFBSupport(domEventName, targetContainer);
       return;

packages/react-dom/src/events/EventSystemFlags.js

@@ -13,11 +13,10 @@ export const IS_EVENT_HANDLE_NON_MANAGED_NODE = 1;
 export const IS_NON_DELEGATED = 1 << 1;
 export const IS_CAPTURE_PHASE = 1 << 2;
 export const IS_PASSIVE = 1 << 3;
-export const IS_REPLAYED = 1 << 4;
-export const IS_LEGACY_FB_SUPPORT_MODE = 1 << 5;
+export const IS_LEGACY_FB_SUPPORT_MODE = 1 << 4;
 
 export const SHOULD_NOT_DEFER_CLICK_FOR_FB_SUPPORT_MODE =
-  IS_LEGACY_FB_SUPPORT_MODE | IS_REPLAYED | IS_CAPTURE_PHASE;
+  IS_LEGACY_FB_SUPPORT_MODE | IS_CAPTURE_PHASE;
 
 // We do not want to defer if the event system has already been
 // set to LEGACY_FB_SUPPORT. LEGACY_FB_SUPPORT only gets set when

packages/react-dom/src/events/ReactDOMEventReplaying.js

@@ -31,6 +31,7 @@ import {
   findInstanceBlockingEvent,
   return_targetInst,
 } from './ReactDOMEventListener';
+import {setReplayingEvent, resetReplayingEvent} from './CurrentReplayingEvent';
 import {dispatchEventForPluginEventSystem} from './DOMPluginEventSystem';
 import {
   getInstanceFromNode,
@@ -91,8 +92,6 @@ type PointerEvent = Event & {
   ...
 };
 
-import {IS_REPLAYED} from './EventSystemFlags';
-
 type QueuedReplayableEvent = {|
   blockedOn: null | Container | SuspenseInstance,
   domEventName: DOMEventName,
@@ -180,7 +179,7 @@ function createQueuedReplayableEvent(
   return {
     blockedOn,
     domEventName,
-    eventSystemFlags: eventSystemFlags | IS_REPLAYED,
+    eventSystemFlags,
     nativeEvent,
     targetContainers: [targetContainer],
   };
@@ -473,6 +472,7 @@ function attemptReplayContinuousQueuedEvent(
       queuedEvent.nativeEvent,
     );
     if (nextBlockedOn === null) {
+      setReplayingEvent(queuedEvent.nativeEvent);
       dispatchEventForPluginEventSystem(
         queuedEvent.domEventName,
         queuedEvent.eventSystemFlags,
@@ -480,6 +480,7 @@ function attemptReplayContinuousQueuedEvent(
         return_targetInst,
         targetContainer,
       );
+      resetReplayingEvent();
     } else {
       // We're still blocked. Try again later.
       const fiber = getInstanceFromNode(nextBlockedOn);
@@ -531,6 +532,7 @@ function replayUnblockedEvents() {
           nextDiscreteEvent.nativeEvent,
         );
         if (nextBlockedOn === null) {
+          setReplayingEvent(nextDiscreteEvent.nativeEvent);
           dispatchEventForPluginEventSystem(
             nextDiscreteEvent.domEventName,
             nextDiscreteEvent.eventSystemFlags,
@@ -538,6 +540,7 @@ function replayUnblockedEvents() {
             return_targetInst,
             targetContainer,
           );
+          resetReplayingEvent();
         } else {
           // We're still blocked. Try again later.
           nextDiscreteEvent.blockedOn = nextBlockedOn;

packages/react-dom/src/events/plugins/EnterLeaveEventPlugin.js

@@ -13,7 +13,7 @@ import type {DispatchQueue} from '../DOMPluginEventSystem';
 import type {EventSystemFlags} from '../EventSystemFlags';
 
 import {registerDirectEvent} from '../EventRegistry';
-import {IS_REPLAYED} from 'react-dom/src/events/EventSystemFlags';
+import {isReplayingEvent} from '../CurrentReplayingEvent';
 import {SyntheticMouseEvent, SyntheticPointerEvent} from '../SyntheticEvent';
 import {
   getClosestInstanceFromNode,
@@ -54,7 +54,7 @@ function extractEvents(
   const isOutEvent =
     domEventName === 'mouseout' || domEventName === 'pointerout';
 
-  if (isOverEvent && (eventSystemFlags & IS_REPLAYED) === 0) {
+  if (isOverEvent && !isReplayingEvent(nativeEvent)) {
     // If this is an over event with a target, we might have already dispatched
     // the event in the out event of the other target. If this is replayed,
     // then it's because we couldn't dispatch against this target previously