A Sink that supports adding errors.
This makes it suitable for capturing the results of asynchronous computations, which can complete with a value or an error.
The EventSink has been designed to handle asynchronous events from Streams. See, for example, Stream.eventTransformed which uses EventSink
s to transform events.
event
to the sink. [...] error
to the sink. [...]
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https://api.dartlang.org/stable/2.0.0/dart-async/EventSink-class.html