whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(@JsonKey.new(name: 'min') String? minVersion, @JsonKey.new(name: 'max') String? maxVersion)?)

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(@JsonKey(name: 'min') String? minVersion,
          @JsonKey(name: 'max') String? maxVersion)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _VersionConfig() when $default != null:
      return $default(_that.minVersion, _that.maxVersion);
    case _:
      return null;
  }
}