when<TResult extends Object?>  method 
- @optionalTypeArgs
- required TResult repoRef(- RepoRef data
 
- required TResult repoStrongRef(- RepoStrongRef data
 
- required TResult repoBlobRef(- RepoBlobRef data
 
- required TResult unknown(),
A switch-like method, using callbacks.
As opposed to map, this offers destructuring.
It is equivalent to doing:
switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}
Implementation
@optionalTypeArgs TResult when<TResult extends Object?>({required TResult Function( RepoRef data)  repoRef,required TResult Function( RepoStrongRef data)  repoStrongRef,required TResult Function( RepoBlobRef data)  repoBlobRef,required TResult Function( Map<String, dynamic> data)  unknown,}) {final _that = this;
switch (_that) {
case UAdminUpdateSubjectStatusSubjectRepoRef():
return repoRef(_that.data);case UAdminUpdateSubjectStatusSubjectRepoStrongRef():
return repoStrongRef(_that.data);case UAdminUpdateSubjectStatusSubjectRepoBlobRef():
return repoBlobRef(_that.data);case UAdminUpdateSubjectStatusSubjectUnknown():
return unknown(_that.data);}
}