superclass property
A mirror on the superclass on the reflectee.
If this type is Object, the superclass will be null.
Implementation
ClassMirror? get superclass;© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-mirrors/ClassMirror/superclass.html