asUtf8Sink abstract method
ByteConversionSink asUtf8Sink(Returns this as a sink that accepts UTF-8 input.
If used, this method must be the first and only call to this. It invalidates this. All further operations must be performed on the result.
Source
ByteConversionSink asUtf8Sink(bool allowMalformed);
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https://api.dartlang.org/stable/1.24.3/dart-convert/StringConversionSink/asUtf8Sink.html