How I went from copying and pasting 300 lines of auth code across projects to a single npm package that handles everything — protected routes, role-based access, and security best practices out of the box. The Problem I Kept Running Into Every time I started a new React Native project with Firebase, I found myself writing the same code. // The same listener. Every. Single. Project. useEffect (() => { const unsubscribe = onAuthStateChanged ( auth , async ( user ) => { if ( user ) { const doc = await getDoc ( doc ( db , ' users ' , user . uid )); setRole ( doc . data ()?. role ?? ' user ' ); setUser ( user ); } else { setUser ( null ); setRole ( null ); } setIsLoaded ( true ); }); return unsubscribe ; }, []); Enter fullscreen mode Exit fullscreen mode Then the route guard logic. Then the redirect logic. Then the "show this only for admins" logic. Then the error messages.…