fix(core): Retry native module resolution to prevent silent event drops

CHANGELOG.md

@@ -15,6 +15,7 @@
 
 ### Fixes
 
+- Retry native module resolution to prevent silent event drops in production Hermes builds ([#5981](https://github.com/getsentry/sentry-react-native/pull/5981))
 - Lazy-load Metro internal modules to prevent Expo 55 import errors ([#5958](https://github.com/getsentry/sentry-react-native/pull/5958))
 - Fix app start transaction profile offset by using the actual profiling start timestamp instead of the adjusted app start time ([#5962](https://github.com/getsentry/sentry-react-native/issues/5962))
 - Use React `componentStack` as fallback when error has no stack trace on Android ([#5965](https://github.com/getsentry/sentry-react-native/pull/5965))

packages/core/src/js/wrapper.ts

@@ -45,7 +45,7 @@ export function getRNSentryModule(): Spec | undefined {
     : NativeModules.RNSentry;
 }
 
-const RNSentry: Spec | undefined = getRNSentryModule();
+let RNSentry: Spec | undefined = getRNSentryModule();
 
 export interface Screenshot {
   data: Uint8Array;
@@ -649,6 +649,9 @@ export const NATIVE: SentryNativeWrapper = {
   },
 
   isNativeAvailable(): boolean {
+    if (!RNSentry) {
+      RNSentry = getRNSentryModule();
+    }
     return this._isModuleLoaded(RNSentry);
   },
 

packages/core/test/wrapper.test.ts

@@ -1208,4 +1208,38 @@ describe('Tests Native Wrapper', () => {
       });
     });
   });
+
+  describe('isNativeAvailable', () => {
+    test('retries module resolution if initially undefined', () => {
+      // Simulate the race condition: RNSentry was undefined at module load time
+      // but becomes available when isNativeAvailable() is called during init()
+      let mockModule: Spec | undefined = undefined;
+
+      jest.resetModules();
+      jest.doMock('react-native', () => ({
+        NativeModules: {
+          get RNSentry() {
+            return mockModule;
+          },
+        },
+        Platform: { OS: 'ios' },
+      }));
+      // Ensure TurboModules path is not used so NativeModules.RNSentry is checked
+      jest.doMock('../src/js/utils/environment', () => ({
+        isTurboModuleEnabled: () => false,
+      }));
+
+      // eslint-disable-next-line @typescript-eslint/no-var-requires
+      const { NATIVE: isolatedNATIVE } = require('../src/js/wrapper');
+
+      // Initially unavailable (simulates race condition)
+      expect(isolatedNATIVE.isNativeAvailable()).toBe(false);
+
+      // Native module becomes available (TurboModule registered)
+      mockModule = RNSentry;
+
+      // isNativeAvailable retries and finds it
+      expect(isolatedNATIVE.isNativeAvailable()).toBe(true);
+    });
+  });
 });