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lib/src/settings/settings_service.dart

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+import 'package:flutter/material.dart';
+
+/// A service that stores and retrieves user settings.
+///
+/// By default, this class does not persist user settings. If you'd like to
+/// persist the user settings locally, use the shared_preferences package. If
+/// you'd like to store settings on a web server, use the http package.
+class SettingsService {
+  /// Loads the User's preferred ThemeMode from local or remote storage.
+  Future<ThemeMode> themeMode() async => ThemeMode.system;
+
+  /// Persists the user's preferred ThemeMode to local or remote storage.
+  Future<void> updateThemeMode(ThemeMode theme) async {
+    // Use the shared_preferences package to persist settings locally or the
+    // http package to persist settings over the network.
+  }
+}