description

# asStringSink method Null safety

ClosableStringSink asStringSink ()
override

Returns `this` as a ClosableStringSink.

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.

## Implementation

    ClosableStringSink asStringSink() {
      return _StringConversionSinkAsStringSinkAdapter(this);
    }