fix(rna): replace useAuthenticator signOut with default version

.changeset/nice-pens-wait.md

@@ -0,0 +1,5 @@
+---
+"@aws-amplify/ui-react-native": patch
+---
+
+fix(rna): replace useAuthenticator signOut with default version

packages/react-native/src/Authenticator/index.ts

@@ -1,6 +1,4 @@
 export { default as Authenticator } from './Authenticator';
 export { AuthenticatorProps, WithAuthenticatorOptions } from './types';
+export { useAuthenticator, UseAuthenticator } from './useAuthenticator';
 export { default as withAuthenticator } from './withAuthenticator';
-
-// re-export shared `Authenticator` exports
-export { useAuthenticator, UseAuthenticator } from '@aws-amplify/ui-react-core';

packages/react-native/src/Authenticator/useAuthenticator.ts

@@ -0,0 +1,34 @@
+// re-export `UseAuthenticator` export
+export { UseAuthenticator } from '@aws-amplify/ui-react-core';
+
+import { signOut as _signOut } from 'aws-amplify/auth';
+import { AuthEventData } from '@aws-amplify/ui';
+
+import {
+  useAuthenticator as _useAuthenticator,
+  UseAuthenticator,
+} from '@aws-amplify/ui-react-core';
+
+// wrap and re-export `useAuthenticator` to replace state machine `signOut` with
+// `aws-amplify/auth` version due to iOS specifc requirements for federated sign
+// out handling with JS. On iOS sign out, JS prmnpts the end user with a native
+// Alert requesting confirmation of sign out, if the end user cancels they will
+// have already been signed out of the state machine, but will still be
+// authenticated on the JS singleton
+
+// input utility function to prevent breaking changes in consumers.
+// State machine sign out handling does not pass input to underlying `signOut`
+// call; replicate that behavior here
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+const signOut = (data?: AuthEventData) => {
+  _signOut();
+};
+
+// selector utility type to prevent breaking type changes in consumers
+type UseAuthenticatorSelector = Parameters<typeof _useAuthenticator>[0];
+
+export function useAuthenticator(
+  selector?: UseAuthenticatorSelector
+): UseAuthenticator {
+  return { ..._useAuthenticator(selector), signOut };
+}