import { type RefObject } from 'react';
import type { TWidthFromAnchorMode } from '../popover/types';
/**
 * Sets the width of a popover element relative to its anchor element.
 *
 * - `'match-anchor'` → `width: anchor-size(width)` - popover matches anchor width exactly.
 * - `'min-anchor'`   → `min-width: anchor-size(width)` - popover is at least as wide as anchor,
 *   but can grow wider.
 * - `'none'`         → no explicit width is set (default behaviour)
 *
 * Uses CSS `anchor-size(width)` when the browser supports it, falling back to a
 * one-off measurement of `anchor.offsetWidth`.
 *
 * Designed to be composed alongside `useAnchorPosition` for top-layer popovers.
 */
export declare function useWidthFromAnchor({ mode, popoverRef, anchorRef, isOpen, }: {
    mode: TWidthFromAnchorMode;
    popoverRef: RefObject<HTMLElement | null>;
    anchorRef: RefObject<HTMLElement | null>;
    isOpen: boolean;
}): void;