From 3be136070f52d83b54739047b2071f16bbeb0183 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rub=C3=A9n=20Norte?= <rubennorte@meta.com>
Date: Sat, 11 Apr 2026 08:39:15 -0700
Subject: [PATCH 1/2] Expose Event, EventTarget and CustomEvent as globals

Summary:
Registers Event, EventTarget and CustomEvent as global polyfills in `setUpDOM.js`. These are standard Web APIs that DOM nodes need access to.

Removes the Event/EventTarget polyfills from the Fantom test setup since they are now provided globally by setUpDOM.js.

Changelog: [internal]

Marking as internal for now, until we ship to stable, even though this isn't gated. We shouldn't communicate this yet.

Differential Revision: D100462548
---
 .../src/private/setup/setUpDOM.js             | 12 ++++++++++
 private/react-native-fantom/src/index.js      | 22 -------------------
 2 files changed, 12 insertions(+), 22 deletions(-)

diff --git a/packages/react-native/src/private/setup/setUpDOM.js b/packages/react-native/src/private/setup/setUpDOM.js
index a506401440c2..b24ab3d3f4f7 100644
--- a/packages/react-native/src/private/setup/setUpDOM.js
+++ b/packages/react-native/src/private/setup/setUpDOM.js
@@ -73,4 +73,16 @@ export default function setUpDOM() {
     'HTMLElement',
     () => require('../webapis/dom/nodes/ReactNativeElement').default,
   );
+
+  polyfillGlobal('Event', () => require('../webapis/dom/events/Event').default);
+
+  polyfillGlobal(
+    'EventTarget',
+    () => require('../webapis/dom/events/EventTarget').default,
+  );
+
+  polyfillGlobal(
+    'CustomEvent',
+    () => require('../webapis/dom/events/CustomEvent').default,
+  );
 }
diff --git a/private/react-native-fantom/src/index.js b/private/react-native-fantom/src/index.js
index 72304f15d012..19dff0d6cb64 100644
--- a/private/react-native-fantom/src/index.js
+++ b/private/react-native-fantom/src/index.js
@@ -712,26 +712,4 @@ function getNode(nodeOrRef: NodeOrRef): ReadOnlyNode {
   }
 }
 
-/**
- * Quick and dirty polyfills required by tinybench.
- */
-
-if (typeof global.Event === 'undefined') {
-  global.Event =
-    require('react-native/src/private/webapis/dom/events/Event').default;
-} else {
-  console.warn(
-    'The global Event class is already defined. If this API is already defined by React Native, you might want to remove this logic.',
-  );
-}
-
-if (typeof global.EventTarget === 'undefined') {
-  global.EventTarget =
-    require('react-native/src/private/webapis/dom/events/EventTarget').default;
-} else {
-  console.warn(
-    'The global Event class is already defined. If this API is already defined by React Native, you might want to remove this logic.',
-  );
-}
-
 global.__FANTOM_PACKAGE_LOADED__ = true;

From 4677ddf930465a59b8a44437e8763ff85c7d0c89 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rub=C3=A9n=20Norte?= <rubennorte@meta.com>
Date: Sat, 11 Apr 2026 08:39:15 -0700
Subject: [PATCH 2/2] Expose dispatchTrustedEvent and setEventInitTimeStamp in
 ReactNativePrivateInterface

Summary:
Changelog: [internal]

The React Native renderer needs access to these internals to dispatch events under the new EventTarget-based event dispatching pipeline.

Differential Revision: D100462549
---
 .../ReactPrivate/ReactNativePrivateInterface.js        | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js b/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js
index 6365f1bee485..385f5c921941 100644
--- a/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js
+++ b/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js
@@ -9,6 +9,8 @@
  */
 
 import typeof CustomEvent from '../../src/private/webapis/dom/events/CustomEvent';
+import typeof {setEventInitTimeStamp} from '../../src/private/webapis/dom/events/internals/EventInternals';
+import typeof {dispatchTrustedEvent} from '../../src/private/webapis/dom/events/internals/EventTargetInternals';
 import typeof BatchedBridge from '../BatchedBridge/BatchedBridge';
 import typeof legacySendAccessibilityEvent from '../Components/AccessibilityInfo/legacySendAccessibilityEvent';
 import typeof TextInputState from '../Components/TextInput/TextInputState';
@@ -133,4 +135,12 @@ module.exports = {
     return require('../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
       .getInternalInstanceHandleFromPublicInstance;
   },
+  get dispatchTrustedEvent(): dispatchTrustedEvent {
+    return require('../../src/private/webapis/dom/events/internals/EventTargetInternals')
+      .dispatchTrustedEvent;
+  },
+  get setEventInitTimeStamp(): setEventInitTimeStamp {
+    return require('../../src/private/webapis/dom/events/internals/EventInternals')
+      .setEventInitTimeStamp;
+  },
 };