import type { RefObject } from 'react';
import type { View } from 'react-native';
export interface AnchorPosition {
    top: number;
    left: number;
    width: number;
    height: number;
}
/**
 * Measures a `View` ref and returns its page-relative bounding rect.
 *
 * Pattern mirrors `src/components/Menu/Menu.tsx`.
 *
 * @param ref   - A ref attached to the anchor View
 * @param open  - Re-measures only when `open` transitions to true
 * @returns `{ top, left, width, height }` or `null` while un-measured
 */
export declare function useAnchorPosition(ref: RefObject<View | null>, open: boolean): AnchorPosition | null;
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