Flutter - Firebase Google Sign-in Auth with SplashScreen using updated API: Как реализовать Google авторизацию с SplashScreen при помощи Firebase Authentication в Flutter приложение.
https://dev.to/movingmelody/flutter-firebase-google-sign-in-auth-with-splashscreen-using-updated-api-23ad
https://dev.to/movingmelody/flutter-firebase-google-sign-in-auth-with-splashscreen-using-updated-api-23ad