whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(List<HTTPAccount>? users, List<HTTPAccount>? accounts, @JsonKey.new(name: 'allowTransparent') bool? transparent, int? userLevel,)?)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  TResult? Function(
          List<HTTPAccount>? users,
          List<HTTPAccount>? accounts,
          @JsonKey(name: 'allowTransparent') bool? transparent,
          int? userLevel)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _HTTPServerConfig() when $default != null:
      return $default(
          _that.users, _that.accounts, _that.transparent, _that.userLevel);
    case _:
      return null;
  }
}