map<TResult extends Object?>  method 
    Null safety
- {required TResult start( ),
- required TResult center( )}
@optionalTypeArgs, inherited
    Implementation
@optionalTypeArgs
TResult map<TResult extends Object?>({
  required TResult Function(FloatingLabelAlignmentStart value) start,
  required TResult Function(FloatingLabelAlignmentCenter value) center,
}) =>
    throw _privateConstructorUsedError;