Function flattenOptions

src/utils/valueUtil.ts:44–96

(
  options: OptionType[],
  { fieldNames, childrenAsData }: { fieldNames?: FieldNames; childrenAsData?: boolean } = {},
)

 * Here is simply set `key` to the index if not provided.
 */
export function flattenOptions<OptionType extends BaseOptionType = DefaultOptionType>(
  options: OptionType[],
  { fieldNames, childrenAsData }: { fieldNames?: FieldNames; childrenAsData?: boolean } = {},
): FlattenOptionData<OptionType>[] {
  const flattenList: FlattenOptionData<OptionType>[] = [];

  const {
    label: fieldLabel,
    value: fieldValue,
    options: fieldOptions,
    groupLabel,
  } = fillFieldNames(fieldNames, false);

  function dig(list: OptionType[], isGroupOption: boolean) {
    if (!Array.isArray(list)) {
      return;
    }

    list.forEach((data) => {
      if (isGroupOption || !(fieldOptions in data)) {
        const value = data[fieldValue];

        // Option
        flattenList.push({
          key: getKey(data, flattenList.length),
          groupOption: isGroupOption,
          data,
          label: data[fieldLabel],
          value,
        });
      } else {
        let grpLabel = data[groupLabel];
        if (grpLabel === undefined && childrenAsData) {
          grpLabel = data.label;
        }

        // Option Group
        flattenList.push({
          key: getKey(data, flattenList.length),
          group: true,
          data,
          label: grpLabel,
        });

        dig(data[fieldOptions], true);
      }
    });
  }

  dig(options, false);

  return flattenList;
}

/**
 * Inject `props` into `option` for legacy usage