I don't think it's very big in the server side community, but the mobile development platform Flutter [1] has taken off and we've enjoyed it so far.
Dart is alright as a language, but it doesn't interoperate very well with other systems due to it's lack of runtime-reflection, just try parsing a [2] JSON message!
[1] https://flutter.dev/
[2] https://medium.com/flutter-community/how-to-parse-json-in-fl...
