add method
override
    Adds chunked data to this sink.
This method is also used when converters are used as StreamTransformers.
Implementation
void add(String str) {
  addSlice(str, 0, str.length, false);
}
    Adds chunked data to this sink.
This method is also used when converters are used as StreamTransformers.
void add(String str) {
  addSlice(str, 0, str.length, false);
}