finlog_app/app/lib/main.dart

@@ -8,7 +8,7 @@ Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
   // any services
-  App.registerDefaultServices();
+  await App.registerDefaultServices();
 
   final logger = App.service<Logger>();
   logger.debug("[MAIN] Registered all default services");

finlog_app/fluttery/lib/fluttery.dart

@@ -30,12 +30,11 @@ class App {
   }
 
   /// Registers the default services required by the application.
-  static void registerDefaultServices() {
+  static Future<void> registerDefaultServices() async {
     registerService<Logger>(() => LoggerImpl());
 
-    SharedPreferences.getInstance().then((instance) {
-      registerService<Preferences>(() => PreferencesImpl(instance: instance));
-    });
+    final prefs = await SharedPreferences.getInstance();
+    registerService<Preferences>(() => PreferencesImpl(instance: prefs));
 
     registerService<SecureStorage>(() => SecureStorageImpl());
   }