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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 BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-async/EventSink/close.html