whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(XrayAddress? address, int? port, int? level, String? email, @JsonKey.new(name: 'user') String? username, @JsonKey.new(name: 'pass') String? password, List<HTTPRemoteConfig>? servers, Map<String, String>? headers,)?)

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(
          XrayAddress? address,
          int? port,
          int? level,
          String? email,
          @JsonKey(name: 'user') String? username,
          @JsonKey(name: 'pass') String? password,
          List<HTTPRemoteConfig>? servers,
          Map<String, String>? headers)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _HTTPClientConfig() when $default != null:
      return $default(_that.address, _that.port, _that.level, _that.email,
          _that.username, _that.password, _that.servers, _that.headers);
    case _:
      return null;
  }
}