Creates a new instance wrapping the given sink
.
Every string that is added to the returned instance is forwarded to the sink
. The instance is allowed to buffer and is not required to forward immediately.
factory StringConversionSink.fromStringSink(StringSink sink) = _StringSinkConversionSink;
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https://api.dartlang.org/stable/2.0.0/dart-convert/StringConversionSink/StringConversionSink.fromStringSink.html