facebook · trueadm · Apr 28, 2020 · Apr 28, 2020
diff --git a/packages/react-dom/src/client/ReactDOMComponent.js b/packages/react-dom/src/client/ReactDOMComponent.js
@@ -59,7 +59,6 @@ import {
   TOP_SUBMIT,
   TOP_TOGGLE,
 } from '../events/DOMTopLevelEventTypes';
-import {getListenerMapForElement} from '../events/DOMEventListenerMap';
 import {mediaEventTypes} from '../events/DOMTopLevelEventTypes';
 import {
   createDangerousStringForStyles,
@@ -96,6 +95,7 @@ import {
   legacyTrapBubbledEvent,
 } from '../events/DOMLegacyEventPluginSystem';
 import {listenToEvent} from '../events/DOMModernPluginEventSystem';
+import {getEventListenerMap} from './ReactDOMComponentTree';
 
 let didWarnInvalidHydration = false;
 let didWarnScriptTags = false;
@@ -1346,7 +1346,7 @@ export function listenToEventResponderEventTypes(
   if (enableDeprecatedFlareAPI) {
     // Get the listening Map for this element. We use this to track
     // what events we're listening to.
-    const listenerMap = getListenerMapForElement(document);
+    const listenerMap = getEventListenerMap(document);
 
     // Go through each target event type of the event responder
     for (let i = 0, length = eventTypes.length; i < length; ++i) {

diff --git a/packages/react-dom/src/client/ReactDOMComponentTree.js b/packages/react-dom/src/client/ReactDOMComponentTree.js
@@ -15,6 +15,7 @@ import type {
   SuspenseInstance,
   Props,
 } from './ReactDOMHostConfig';
+import type {DOMTopLevelEventType} from 'legacy-events/TopLevelEventTypes';
 
 import {
   HostComponent,
@@ -30,8 +31,19 @@ const randomKey = Math.random()
   .toString(36)
   .slice(2);
 const internalInstanceKey = '__reactFiber$' + randomKey;
-const internalEventHandlersKey = '__reactEvents$' + randomKey;
+const internalPropsKey = '__reactProps$' + randomKey;
 const internalContainerInstanceKey = '__reactContainer$' + randomKey;
+const internalEventHandlersKey = '__reactEvents$' + randomKey;
+
+export type ElementListenerMap = Map<
+  DOMTopLevelEventType | string,
+  ElementListenerMapEntry,
+>;
+
+export type ElementListenerMapEntry = {
+  passive: void | boolean,
+  listener: any => void,
+};
 
 export function precacheFiberNode(
   hostInst: Fiber,
@@ -176,12 +188,20 @@ export function getNodeFromInstance(inst: Fiber): Instance | TextInstance {
 export function getFiberCurrentPropsFromNode(
   node: Instance | TextInstance | SuspenseInstance,
 ): Props {
-  return (node: any)[internalEventHandlersKey] || null;
+  return (node: any)[internalPropsKey] || null;
 }
 
 export function updateFiberProps(
   node: Instance | TextInstance | SuspenseInstance,
   props: Props,
 ): void {
-  (node: any)[internalEventHandlersKey] = props;
+  (node: any)[internalPropsKey] = props;
+}
+
+export function getEventListenerMap(node: EventTarget): ElementListenerMap {
+  let elementListenerMap = (node: any)[internalEventHandlersKey];
+  if (elementListenerMap === undefined) {
+    elementListenerMap = (node: any)[internalEventHandlersKey] = new Map();
+  }
+  return elementListenerMap;
 }
diff --git a/packages/react-dom/src/events/DOMEventListenerMap.js b/packages/react-dom/src/events/DOMEventListenerMap.js
diff --git a/packages/react-dom/src/events/DOMLegacyEventPluginSystem.js b/packages/react-dom/src/events/DOMLegacyEventPluginSystem.js
@@ -9,7 +9,7 @@
 
 import type {AnyNativeEvent} from 'legacy-events/PluginModuleType';
 import type {DOMTopLevelEventType} from 'legacy-events/TopLevelEventTypes';
-import type {ElementListenerMap} from '../events/DOMEventListenerMap';
+import type {ElementListenerMap} from '../client/ReactDOMComponentTree';
 import type {EventSystemFlags} from './EventSystemFlags';
 import type {Fiber} from 'react-reconciler/src/ReactInternalTypes';
 import type {PluginModule} from 'legacy-events/PluginModuleType';
@@ -29,8 +29,10 @@ import accumulateInto from 'legacy-events/accumulateInto';
 import {registrationNameDependencies} from 'legacy-events/EventPluginRegistry';
 
 import getEventTarget from './getEventTarget';
-import {getClosestInstanceFromNode} from '../client/ReactDOMComponentTree';
-import {getListenerMapForElement} from './DOMEventListenerMap';
+import {
+  getClosestInstanceFromNode,
+  getEventListenerMap,
+} from '../client/ReactDOMComponentTree';
 import isEventSupported from './isEventSupported';
 import {
   TOP_BLUR,
@@ -319,7 +321,7 @@ export function legacyListenToEvent(
   registrationName: string,
   mountAt: Document | Element,
 ): void {
-  const listenerMap = getListenerMapForElement(mountAt);
+  const listenerMap = getEventListenerMap(mountAt);
   const dependencies = registrationNameDependencies[registrationName];
 
   for (let i = 0; i < dependencies.length; i++) {

diff --git a/packages/react-dom/src/events/DOMModernPluginEventSystem.js b/packages/react-dom/src/events/DOMModernPluginEventSystem.js
@@ -12,7 +12,7 @@ import type {DOMTopLevelEventType} from 'legacy-events/TopLevelEventTypes';
 import type {
   ElementListenerMap,
   ElementListenerMapEntry,
-} from '../events/DOMEventListenerMap';
+} from '../client/ReactDOMComponentTree';
 import type {EventSystemFlags} from './EventSystemFlags';
 import type {EventPriority, ReactScopeMethods} from 'shared/ReactTypes';
 import type {Fiber} from 'react-reconciler/src/ReactInternalTypes';
@@ -36,7 +36,6 @@ import {
 } from 'react-reconciler/src/ReactWorkTags';
 
 import getEventTarget from './getEventTarget';
-import {getListenerMapForElement} from './DOMEventListenerMap';
 import {
   TOP_FOCUS,
   TOP_LOAD,
@@ -74,7 +73,10 @@ import {
   TOP_SELECTION_CHANGE,
   getRawEventName,
 } from './DOMTopLevelEventTypes';
-import {getClosestInstanceFromNode} from '../client/ReactDOMComponentTree';
+import {
+  getClosestInstanceFromNode,
+  getEventListenerMap,
+} from '../client/ReactDOMComponentTree';
 import {COMMENT_NODE} from '../shared/HTMLNodeType';
 import {batchedEventUpdates} from './ReactDOMUpdateBatching';
 import getListener from './getListener';
@@ -237,7 +239,7 @@ export function listenToTopLevelEvent(
   // triggered on the document directly.
   if (topLevelType === TOP_SELECTION_CHANGE) {
     targetContainer = (targetContainer: any).ownerDocument || targetContainer;
-    listenerMap = getListenerMapForElement(targetContainer);
+    listenerMap = getEventListenerMap(targetContainer);
   }
   const listenerEntry: ElementListenerMapEntry | void = listenerMap.get(
     topLevelType,
@@ -262,7 +264,7 @@ export function listenToEvent(
   registrationName: string,
   rootContainerElement: Element,
 ): void {
-  const listenerMap = getListenerMapForElement(rootContainerElement);
+  const listenerMap = getEventListenerMap(rootContainerElement);
   const dependencies = registrationNameDependencies[registrationName];
 
   for (let i = 0; i < dependencies.length; i++) {

diff --git a/packages/react-dom/src/events/ReactDOMEventReplaying.js b/packages/react-dom/src/events/ReactDOMEventReplaying.js
@@ -10,7 +10,7 @@
 import type {AnyNativeEvent} from 'legacy-events/PluginModuleType';
 import type {Container, SuspenseInstance} from '../client/ReactDOMHostConfig';
 import type {DOMTopLevelEventType} from 'legacy-events/TopLevelEventTypes';
-import type {ElementListenerMap} from '../events/DOMEventListenerMap';
+import type {ElementListenerMap} from '../client/ReactDOMComponentTree';
 import type {EventSystemFlags} from './EventSystemFlags';
 import type {FiberRoot} from 'react-reconciler/src/ReactInternalTypes';
 
@@ -31,10 +31,10 @@ import {
   getSuspenseInstanceFromFiber,
 } from 'react-reconciler/src/ReactFiberTreeReflection';
 import {attemptToDispatchEvent} from './ReactDOMEventListener';
-import {getListenerMapForElement} from './DOMEventListenerMap';
 import {
   getInstanceFromNode,
   getClosestInstanceFromNode,
+  getEventListenerMap,
 } from '../client/ReactDOMComponentTree';
 import {unsafeCastDOMTopLevelTypeToString} from 'legacy-events/TopLevelEventTypes';
 import {HostRoot, SuspenseComponent} from 'react-reconciler/src/ReactWorkTags';
@@ -256,10 +256,10 @@ export function eagerlyTrapReplayableEvents(
   container: Container,
   document: Document,
 ) {
-  const listenerMapForDoc = getListenerMapForElement(document);
+  const listenerMapForDoc = getEventListenerMap(document);
   let listenerMapForContainer;
   if (enableModernEventSystem) {
-    listenerMapForContainer = getListenerMapForElement(container);
+    listenerMapForContainer = getEventListenerMap(container);
   }
   // Discrete
   discreteReplayableEvents.forEach(topLevelType => {

diff --git a/packages/react-dom/src/events/plugins/LegacySelectEventPlugin.js b/packages/react-dom/src/events/plugins/LegacySelectEventPlugin.js
@@ -22,12 +22,16 @@ import {
   TOP_SELECTION_CHANGE,
 } from '../DOMTopLevelEventTypes';
 import getActiveElement from '../../client/getActiveElement';
-import {getNodeFromInstance} from '../../client/ReactDOMComponentTree';
+import {
+  getNodeFromInstance,
+  getEventListenerMap,
+} from '../../client/ReactDOMComponentTree';
 import {hasSelectionCapabilities} from '../../client/ReactInputSelection';
 import {DOCUMENT_NODE} from '../../shared/HTMLNodeType';
-import {isListeningToAllDependencies} from '../DOMEventListenerMap';
 import {accumulateTwoPhaseDispatches} from '../DOMLegacyEventPluginSystem';
 
+import {registrationNameDependencies} from 'legacy-events/EventPluginRegistry';
+
 const skipSelectionChangeEvent =
   canUseDOM && 'documentMode' in document && document.documentMode <= 11;
 
@@ -143,6 +147,21 @@ function constructSelectEvent(nativeEvent, nativeEventTarget) {
   return null;
 }
 
+function isListeningToAllDependencies(
+  registrationName: string,
+  mountAt: Document | Element,
+): boolean {
+  const dependencies = registrationNameDependencies[registrationName];
+  const listenerMap = getEventListenerMap(mountAt);
+  for (let i = 0; i < dependencies.length; i++) {
+    const event = dependencies[i];
+    if (!listenerMap.has(event)) {
+      return false;
+    }
+  }
+  return true;
+}
+
 /**
  * This plugin creates an `onSelect` event that normalizes select events
  * across form elements.

diff --git a/packages/react-dom/src/events/plugins/ModernSelectEventPlugin.js b/packages/react-dom/src/events/plugins/ModernSelectEventPlugin.js
@@ -22,10 +22,12 @@ import {
   TOP_SELECTION_CHANGE,
 } from '../DOMTopLevelEventTypes';
 import getActiveElement from '../../client/getActiveElement';
-import {getNodeFromInstance} from '../../client/ReactDOMComponentTree';
+import {
+  getNodeFromInstance,
+  getEventListenerMap,
+} from '../../client/ReactDOMComponentTree';
 import {hasSelectionCapabilities} from '../../client/ReactInputSelection';
 import {DOCUMENT_NODE} from '../../shared/HTMLNodeType';
-import {isListeningToEvent, isListeningToEvents} from '../DOMEventListenerMap';
 import {accumulateTwoPhaseListeners} from '../DOMModernPluginEventSystem';
 
 const skipSelectionChangeEvent =
@@ -144,6 +146,28 @@ function constructSelectEvent(nativeEvent, nativeEventTarget) {
   return null;
 }
 
+function isListeningToEvents(
+  events: Array<string>,
+  mountAt: Document | Element,
+): boolean {
+  const listenerMap = getEventListenerMap(mountAt);
+  for (let i = 0; i < events.length; i++) {
+    const event = events[i];
+    if (!listenerMap.has(event)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+function isListeningToEvent(
+  registrationName: string,
+  mountAt: Document | Element,
+): boolean {
+  const listenerMap = getEventListenerMap(mountAt);
+  return listenerMap.has(registrationName);
+}
+
 /**
  * This plugin creates an `onSelect` event that normalizes select events
  * across form elements.