From ec5554c151256354192246f5dbdf9c00256dfabd Mon Sep 17 00:00:00 2001
From: root <fakhry.messaoudi@gmail.com>
Date: Tue, 18 Aug 2026 22:27:35 +0200
Subject: [PATCH 1/3] =?UTF-8?q?fix:=20=F0=9F=90=9B=20Fix=20NativeSynthetic?=
 =?UTF-8?q?Event=20compatibility?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../react-native/Libraries/Types/CoreEventTypes.js   | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/packages/react-native/Libraries/Types/CoreEventTypes.js b/packages/react-native/Libraries/Types/CoreEventTypes.js
index dff10cb27609..a3149742b222 100644
--- a/packages/react-native/Libraries/Types/CoreEventTypes.js
+++ b/packages/react-native/Libraries/Types/CoreEventTypes.js
@@ -11,24 +11,24 @@
 import type {HostInstance} from '../../src/private/types/HostInstance';
 
 export type NativeSyntheticEvent<out T> = Readonly<{
-  bubbles: ?boolean,
-  cancelable: ?boolean,
+  bubbles: boolean,
+  cancelable: boolean,
   currentTarget: number | HostInstance,
-  defaultPrevented: ?boolean,
+  defaultPrevented: boolean,
   dispatchConfig: Readonly<{
     registrationName: string,
   }>,
-  eventPhase: ?number,
+  eventPhase: number,
   preventDefault: () => void,
   isDefaultPrevented: () => boolean,
   stopPropagation: () => void,
   isPropagationStopped: () => boolean,
-  isTrusted: ?boolean,
+  isTrusted: boolean,
   nativeEvent: T,
   persist: () => void,
   target: ?number | HostInstance,
   timeStamp: number,
-  type: ?string,
+  type: string,
 }>;
 
 export type ResponderSyntheticEvent<T> = Readonly<{

From 6372ad5084ad32f63075ae07891526c71d3aed7e Mon Sep 17 00:00:00 2001
From: root <fakhry.messaoudi@gmail.com>
Date: Tue, 18 Aug 2026 22:28:45 +0200
Subject: [PATCH 2/3] =?UTF-8?q?fix:=20=F0=9F=90=9B=20Update=20generated=20?=
 =?UTF-8?q?NativeSyntheticEvent=20types?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 packages/react-native/ReactNativeApi.d.ts | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/packages/react-native/ReactNativeApi.d.ts b/packages/react-native/ReactNativeApi.d.ts
index a04517cbd5a0..c767916e23ff 100644
--- a/packages/react-native/ReactNativeApi.d.ts
+++ b/packages/react-native/ReactNativeApi.d.ts
@@ -3180,19 +3180,19 @@ declare type NativeScrollVelocity = {
   readonly y: number
 }
 declare type NativeSyntheticEvent<T> = {
-  readonly bubbles: boolean | undefined
-  readonly cancelable: boolean | undefined
+  readonly bubbles: boolean
+  readonly cancelable: boolean
   readonly currentTarget: HostInstance | number
-  readonly defaultPrevented: boolean | undefined
+  readonly defaultPrevented: boolean
   readonly dispatchConfig: {
     readonly registrationName: string
   }
-  readonly eventPhase: number | undefined
-  readonly isTrusted: boolean | undefined
+  readonly eventPhase: number
+  readonly isTrusted: boolean
   readonly nativeEvent: T
   readonly target: (number | undefined) | HostInstance
   readonly timeStamp: number
-  readonly type: string | undefined
+  readonly type: string
   readonly isDefaultPrevented: () => boolean
   readonly isPropagationStopped: () => boolean
   readonly persist: () => void

From aafad40f2db0a7f34a20474fb8544e2a43137434 Mon Sep 17 00:00:00 2001
From: root <fakhry.messaoudi@gmail.com>
Date: Tue, 18 Aug 2026 22:29:30 +0200
Subject: [PATCH 3/3] =?UTF-8?q?fix:=20=F0=9F=90=9B=20Test=20BaseSyntheticE?=
 =?UTF-8?q?vent=20compatibility?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 packages/react-native/__typetests__/index.tsx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/react-native/__typetests__/index.tsx b/packages/react-native/__typetests__/index.tsx
index 54ea8b7694ba..be792e40c449 100644
--- a/packages/react-native/__typetests__/index.tsx
+++ b/packages/react-native/__typetests__/index.tsx
@@ -391,6 +391,9 @@ processColor(Symbol('test'));
 const testNativeSyntheticEvent = <T extends {}>(
   e: NativeSyntheticEvent<T>,
 ): void => {
+  const baseEvent: React.BaseSyntheticEvent = e;
+  baseEvent.preventDefault();
+
   e.isDefaultPrevented();
   e.preventDefault();
   e.isPropagationStopped();