Closes the stream.
Listeners receive the done event at a later microtask. This behavior can be overridden by using sync
controllers. Note, however, that sync controllers have to satisfy the preconditions mentioned in the documentation of the constructors.
Future close();
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-async/StreamController/close.html