close method
override
Closes the sink.
Calling this method more than once is allowed, but does nothing.
Neither add nor addError must be called after this method.
Implementation
void close();
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.13.0/dart-async/EventSink/close.html