/** Hook that will observe Window Resize
 * @internal
 * Reference: https://github.com/iTwin/iTwinUI/blob/87bbc99316c17bd2b763a730135fbb45c84b0e82/packages/itwinui-react/src/utils/hooks/useResizeObserver.tsx
 * Copied from: https://github.com/iTwin/appui/blob/master/ui/core-react/src/core-react/utils/hooks/useResizeObserver.tsx
 */
export declare const useResizeObserver: <T extends HTMLElement>(onResize: (size: DOMRectReadOnly) => void) => readonly [(element: T | null | undefined) => void, ResizeObserver | undefined];
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