If you are migrating to or starting a fresh project with Expo Router v4, you have likely encountered the "White Screen of Death" or the console screaming Maximum update depth exceeded . This usually occurs when implementing protected routes. You follow the documentation, set up a useEffect to check for a user session, and issue a router.replace() . Suddenly, your app enters a render loop, or deep links fail to resolve because the navigation state isn't ready when the auth check fires. Here is the root cause analysis and a production-grade implementation to handle authentication flows without race conditions. The Root Cause: Fighting the Navigation Cycle The infinite loop happens because of a conflict between React's render cycle and the Router's navigation lifecycle. The Trigger: Your Root Layout mounts. The useEffect fires, detects no user, and calls router.replace('/login') . The Action: The router unmounts the current scre...
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