library universal_ui; import 'package:flutter/foundation.dart'; import 'fake_ui.dart' if (dart.library.html) 'real_ui.dart' as ui_instance; class PlatformViewRegistryFix { void registerViewFactory(dynamic x, dynamic y) { if (kIsWeb) { ui_instance.PlatformViewRegistry.registerViewFactory( x, y, ); } } } class UniversalUI { PlatformViewRegistryFix platformViewRegistry = PlatformViewRegistryFix(); } var ui = UniversalUI();