Is it possible to use Google Appengine Channel API with DART language? It would be great if you can point to some examples and pitfalls if any.
The solution I've recommended is to use the Channel API in JS to open a socket and forward all messages via a postMessage or a custom event, and receive them in Dart.
I'm not sure if any generic solution has been open sourced, but it should be fairly trivial to do, and doesn't require general JS-interop to work.
edit: clarified
edit 2:
FYI: I just published a library to do exactly this. I hope it works for you!