Creates a new instance combining a StringSink sink and a callback onClose which is invoked when the returned instance is closed.
factory ClosableStringSink.fromStringSink(StringSink sink, void onClose()) =
_ClosableStringSink;
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https://api.dart.dev/stable/2.5.0/dart-convert/ClosableStringSink/ClosableStringSink.fromStringSink.html