import { RefObject } from 'react';
/**
 * Size information reported by ResizeObserver (CSS pixels).
 *
 * @category Hooks
 */
export interface ObservedElementSize {
    /** Element width in pixels. */
    width: number;
    /** Element height in pixels. */
    height: number;
}
/**
 * Observes a single DOM element using ResizeObserver
 * and invokes a callback when its size changes.
 *
 * Uses the content box by default, or the border box when `borderBox` is true
 * (includes padding and border; excludes margin).
 *
 * Does not trigger component re-render.
 *
 * @function
 * @param ref Reference to the observed HTMLElement.
 * @param onResize Called when size changes.
 * @param enabled Enables or disables observation. Default: true.
 * @param borderBox When true, report border box size; when false, content box. Default: false.
 *
 * @category Hooks
 */
export declare function useResizeObserver<T extends HTMLElement>(ref: RefObject<T>, onResize: (size: ObservedElementSize) => void, enabled?: boolean, borderBox?: boolean): void;