isInitialRoute error about flutter_ecommerce_app

[lwluck]

From https://flutter.dev/docs/release/breaking-changes/route-navigator-refactoring

Finally, we removed the isInitialRoute property from RouteSetting as part of refactoring, and provided the onGenerateInitialRoutes API for full control of initial routes generation.

There is a migration guide on that page as well. I will have a PR up shortly which I believe fixes it and cleans up some naming issues I noticed, but the below seems to work.

main.dart

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'E-Commerce ',
      theme: AppTheme.lightTheme.copyWith(
        textTheme: GoogleFonts.muliTextTheme(
          Theme.of(context).textTheme,
        ),
      ),
      debugShowCheckedModeBanner: false,
      routes: Routes.getRoute(),
      onGenerateRoute: (RouteSettings settings) {
        if (settings.name.contains('detail')) {
          return CustomRoute<bool>(
              builder: (BuildContext context) => ProductDetailPage());
        } else {
          return CustomRoute<bool>(
              builder: (BuildContext context) => MainPage());
        }
      },
      initialRoute: "MainPage",
    );
  }
}

customRoute.dart

class CustomRoute<T> extends MaterialPageRoute<T> {
  CustomRoute({WidgetBuilder builder, RouteSettings settings})
      : super(builder: builder, settings: settings);
  @override
  Widget buildTransitions(BuildContext context, Animation<double> animation,
      Animation<double> secondaryAnimation, Widget child) {
    if (settings.name == "MainPage") {
      return child;
    }
    return FadeTransition(
      opacity: animation,
      child: child,
    );
  }
}