mapOrNull<TResult extends Object?>  method 
- @optionalTypeArgs
- TResult? user(- UModerationCauseSourceUser value
 
- TResult? list(- UModerationCauseSourceList value
 
- TResult? labeler(- UModerationCauseSourceLabeler value
 
A variant of map that fallback to returning null.
It is equivalent to doing:
switch (sealedClass) {
  case final Subclass value:
    return ...;
  case _:
    return null;
}
Implementation
@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( UModerationCauseSourceUser value)?  user,TResult? Function( UModerationCauseSourceList value)?  list,TResult? Function( UModerationCauseSourceLabeler value)?  labeler,}){
final _that = this;
switch (_that) {
case UModerationCauseSourceUser() when user != null:
return user(_that);case UModerationCauseSourceList() when list != null:
return list(_that);case UModerationCauseSourceLabeler() when labeler != null:
return labeler(_that);case _:
  return null;
}
}