fix: [SDK-4342] guard against missing EventEmitter to prevent crash on Old Architecture

src/events/EventManager.test.ts

@@ -93,6 +93,18 @@ describe('EventManager', () => {
       new EventManager(null as never);
       expect(freshModule.onPermissionChanged).not.toHaveBeenCalled();
     });
+
+    test('should not crash when event emitters are unavailable (Old Architecture)', () => {
+      const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+      const moduleWithoutEmitters = {} as never;
+
+      expect(() => new EventManager(moduleWithoutEmitters)).not.toThrow();
+      expect(consoleSpy).toHaveBeenCalledWith(
+        expect.stringContaining('Native event emitters are not available'),
+      );
+
+      consoleSpy.mockRestore();
+    });
   });
 
   describe('addEventListener', () => {

src/events/EventManager.ts

@@ -60,6 +60,14 @@ export default class EventManager {
   setupListeners() {
     if (this.RNOneSignal == null) return;
 
+    if (typeof this.RNOneSignal.onPermissionChanged !== 'function') {
+      console.error(
+        'OneSignal: Native event emitters are not available. ' +
+          'Ensure the New Architecture (TurboModules) is enabled and the native module is rebuilt.',
+      );
+      return;
+    }
+
     this.nativeSubscriptions.push(
       this.RNOneSignal.onPermissionChanged((payload) => {
         const typed = payload as { permission: boolean };