toJson method Null safety

Implementation

Map<String, dynamic> toJson() {
  final json = _$BaseMessageFetchParamsToJson(this);
  final replies = includeReplies;
  final parentText = includeParentMessageText;
  if (replies != null) {
    json['include_reply_type'] = replies ? 'ALL' : 'NONE';
  }
  if (parentText != null) {
    json['include_parent_message_info'] = parentText;
  }
  json.removeWhere((key, value) => value == null);
  return json;
}