Function useLabels

packages/react-aria/src/utils/useLabels.ts:22–48

(
  props: DOMProps & AriaLabelingProps,
  defaultLabel?: string
)

 * @param defaultLabel - Default value for aria-label when not present.
 */
export function useLabels(
  props: DOMProps & AriaLabelingProps,
  defaultLabel?: string
): DOMProps & AriaLabelingProps {
  let {id, 'aria-label': label, 'aria-labelledby': labelledBy} = props;

  // If there is both an aria-label and aria-labelledby,
  // combine them by pointing to the element itself.
  id = useId(id);
  if (labelledBy && label) {
    let ids = new Set([id, ...labelledBy.trim().split(/\s+/)]);
    labelledBy = [...ids].join(' ');
  } else if (labelledBy) {
    labelledBy = labelledBy.trim().split(/\s+/).join(' ');
  }

  // If no labels are provided, use the default
  if (!label && !labelledBy && defaultLabel) {
    label = defaultLabel;
  }

  return {
    id,
    'aria-label': label,
    'aria-labelledby': labelledBy
  };
}