" a remarkable improvement over plain JS" - Agreed. Optional types for the win. Types when you want them but just make something <any> when you want to get up

" a remarkable improvement over plain JS" - Agreed. Optional types for the win. Types when you want them but just make something <any> when you want to get up to your old js tricks. Dart gives you a first class experience of optional typing with things like checked mode at runtime but I think typescript gets the 80/20 by enhancing js in a very clever way.