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export interface AuthContext {
  session: Session | null | undefined;
  user: User | null | undefined;
}

const AuthContext = createContext<AuthContext | null>(null);

export const AuthProvider = ({ children }) => {
  const [user, setUser] = useState<User>();
  const [session, setSession] = useState<Session | null>();

  useEffect(() => {
    const setData = async () => {
      const {
        data: { session },
        error,
      } = await supabaseClient.auth.getSession();
      if (error) throw error;
      setSession(session);
      setUser(session?.user);
    };

    const { data: listener } = supabaseClient.auth.onAuthStateChange((_event, session) => {
      setSession(session);
      setUser(session?.user);
    });

    setData();

    return () => {
      listener?.subscription.unsubscribe();
    };
  }, []);

  const value = {
    session,
    user,
  };

  // use a provider to pass down the value
  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
};

export function useAuth() {
  const context = useContext(AuthContext);
  if (!context) {
    throw new Error('useAuth must be used within an AuthProvider');
  }
  return context;
}

And then I do in main.tsx
// Set up a Router instance
const router = createRouter({
  routeTree,
  defaultPreload: 'intent',
  context: {
    auth: undefined!, // This will be set after we wrap the app in an AuthProvider
  },
});

// Register things for typesafety
declare module '@tanstack/react-router' {
  interface Register {
    router: typeof router;
  }
}

function InnerApp() {
  const auth = useAuth();
  return <RouterProvider router={router} context={{ auth }} />;
}

function App() {
  return (
    <AuthProvider>
      <InnerApp />
    </AuthProvider>
  );
}`

export const Route = createFileRoute('/_authenticated')({
  beforeLoad: async ({ context, location }) => {
    console.log(context);
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