close abstract method
Future close(Closes the controller's stream.
As StreamController.close, but must not be called while an event is being added by add, addError or close.
Source
Future close();
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-async/SynchronousStreamController/close.html