1. protected
void debugFillDescription(List<String> description)

Accumulates a list of strings describing the current node's fields, one field per string. Subclasses should override this to have their information included in toStringDeep.

Source 

@protected
void debugFillDescription(List<String> description) {
  if (debugCreator != null)
    description.add('creator: $debugCreator');
  description.add('parentData: $parentData');
  description.add('constraints: $constraints');
}