Adds all elements of the given stream to this.
Returns a Future that completes when all elements of the given stream are added to this.
This function must not be called when a stream is currently being added using this function.
Future addStream(Stream<List<int>> stream);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-io/IOSink/addStream.html