import React from 'react';
import { Size } from '../utils/geometry';
declare type UseSizeOptions = {
    /** A reference to the element whose size to observe */
    refToObserve: React.RefObject<HTMLElement | SVGElement>;
    /** Whether we want to currently observe or not */
    isObserving: boolean;
};
export declare function useSize({ refToObserve, isObserving }: UseSizeOptions): Size | undefined;
export {};