save before flutter upgrade

lib/services/navigation_service.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/material.dart';
+
+class NavigationService {
+  static GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
+
+  static navigateTo(String routeName) async {
+    return await navigatorKey.currentState!.pushNamed(routeName);
+  }
+
+  static replaceTo(String routeName) async {
+    return await navigatorKey.currentState!.pushReplacementNamed(routeName);
+  }
+
+  static removeTo(String newRoute) async {
+    return await navigatorKey.currentState!
+        .pushNamedAndRemoveUntil(newRoute, (_) => false);
+  }
+}