react-native-demo / app / hooks / use-authentication.ts

import { useCallback } from "react";
import { useFocusEffect, useRouter } from "expo-router";
import { useToken } from "@/providers/token-provider";

export const useAuthentication = () => {
  const { token } = useToken();
  const router = useRouter();

  useFocusEffect(
    useCallback(() => {
      if (token) {
        return;
      }

      router.push("/(auth)");
    }, [token, router]),
  );
};