Change legacy-events plugin nativeEventTarget to allow null (#17344)

Author: elicwhite

packages/legacy-events/EventPluginHub.js

@@ -134,7 +134,7 @@ function extractPluginEvents(
   topLevelType: TopLevelType,
   targetInst: null | Fiber,
   nativeEvent: AnyNativeEvent,
-  nativeEventTarget: EventTarget,
+  nativeEventTarget: null | EventTarget,
   eventSystemFlags: EventSystemFlags,
 ): Array<ReactSyntheticEvent> | ReactSyntheticEvent | null {
   let events = null;
@@ -161,7 +161,7 @@ export function runExtractedPluginEventsInBatch(
   topLevelType: TopLevelType,
   targetInst: null | Fiber,
   nativeEvent: AnyNativeEvent,
-  nativeEventTarget: EventTarget,
+  nativeEventTarget: null | EventTarget,
   eventSystemFlags: EventSystemFlags,
 ) {
   const events = extractPluginEvents(

packages/legacy-events/PluginModuleType.js

@@ -27,7 +27,7 @@ export type PluginModule<NativeEvent> = {
     topLevelType: TopLevelType,
     targetInst: null | Fiber,
     nativeTarget: NativeEvent,
-    nativeEventTarget: EventTarget,
+    nativeEventTarget: null | EventTarget,
     eventSystemFlags: EventSystemFlags,
   ) => ?ReactSyntheticEvent,
   tapMoveThreshold?: number,

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

@@ -250,7 +250,7 @@ const SimpleEventPlugin: PluginModule<MouseEvent> & {
     topLevelType: TopLevelType,
     targetInst: null | Fiber,
     nativeEvent: MouseEvent,
-    nativeEventTarget: EventTarget,
+    nativeEventTarget: null | EventTarget,
     eventSystemFlags: EventSystemFlags,
   ): null | ReactSyntheticEvent {
     const dispatchConfig = topLevelEventsToDispatchConfig[topLevelType];

packages/react-native-renderer/src/ReactNativeBridgeEventPlugin.js

@@ -35,7 +35,7 @@ const ReactNativeBridgeEventPlugin = {
     topLevelType: TopLevelType,
     targetInst: null | Object,
     nativeEvent: AnyNativeEvent,
-    nativeEventTarget: Object,
+    nativeEventTarget: null | Object,
     eventSystemFlags: EventSystemFlags,
   ): ?Object {
     if (targetInst == null) {