Function buildCategorizedOptions

packages/react-select/src/Select.tsx:398–434

(
  props: Props<Option, IsMulti, Group>,
  selectValue: Options<Option>
)

}

function buildCategorizedOptions<
  Option,
  IsMulti extends boolean,
  Group extends GroupBase<Option>
>(
  props: Props<Option, IsMulti, Group>,
  selectValue: Options<Option>
): CategorizedGroupOrOption<Option, Group>[] {
  return props.options
    .map((groupOrOption, groupOrOptionIndex) => {
      if ('options' in groupOrOption) {
        const categorizedOptions = groupOrOption.options
          .map((option, optionIndex) =>
            toCategorizedOption(props, option, selectValue, optionIndex)
          )
          .filter((categorizedOption) => isFocusable(props, categorizedOption));
        return categorizedOptions.length > 0
          ? {
              type: 'group' as const,
              data: groupOrOption,
              options: categorizedOptions,
              index: groupOrOptionIndex,
            }
          : undefined;
      }
      const categorizedOption = toCategorizedOption(
        props,
        groupOrOption,
        selectValue,
        groupOrOptionIndex
      );
      return isFocusable(props, categorizedOption)
        ? categorizedOption
        : undefined;
    })
    .filter(notNullish);
}

function buildFocusableOptionsFromCategorizedOptions<
  Option,