import { Ref } from 'vue';
import { HTMLDirection } from '../types';
/**
 * Composable for detecting the directionality of the context surrounding a component.
 * For example, if the component is wrapped in <div dir="rtl">...</div>, this composable
 * detects that and returns 'rtl'.
 *
 * The value returned by this composable will initially be null, and will then update to the
 * detected language code later, when the component mounts. This is because detecting the language
 * is not possible until the component has been mounted. Code using this composable should
 * anticipate this, and check whether the value is null.
 *
 * @param root Template ref for the root element of the component
 * @return The detected direction, or null if the component hasn't been mounted yet.
 */
export default function useComputedDirection(root: Ref<HTMLElement | undefined>): Ref<HTMLDirection | null>;