revert

-import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
-import 'package:flutter_screenutil/flutter_screenutil.dart';
+import 'package:device_preview/device_preview.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+import 'src/first_method.dart' as firstMethod;
+import 'src/second_method.dart' as secondMethod;
 
-void main(List<String> args) {
-  WidgetsFlutterBinding.ensureInitialized();
-  SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
-  runApp(const App());
+void main() {
+  const method = int.fromEnvironment('method', defaultValue: 1);
+  runApp(
+    DevicePreview(
+      enabled: kDebugMode && kIsWeb,
+      builder: (context) {
+        return method == 1 ? firstMethod.MyApp() : secondMethod.MyApp();
+      },
+    ),
+  );
 }
-
-class App extends StatelessWidget {
-  const App({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return ScreenUtilInit(
-      builder: (context, child) => MaterialApp(
-        themeMode: ThemeMode.system,
-        theme: ThemeData.light(),
-        darkTheme: ThemeData.dark(),
-        home: const Home(),
-      ),
-    );
-  }
-}
-
-class Home extends StatelessWidget {
-  const Home({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Home'),
-      ),
-      body: const Center(
-        child: Text('Home'),
-      ),
-    );
-  }
-}
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