How should I use stream.cast instead of typed?

Question

so i'm getting the error shown in the image and my question is: How should I use stream.cast in this case?

Answer 1

Try to change this :

var stream  = new http.ByteStream(DelegatingStream.typed(_image.openRead()));

To this :

var stream  = new http.ByteStream(_image.openRead());
stream.cast();