/// <reference types="react" />
interface UseObserver {
    (callback: IntersectionObserverCallback, options?: IntersectionObserverInit, externalState?: React.ComponentState[]): (node: Element | null) => void;
}
/**
 * useObserver
 * @param callback IntersectionObserverCallback
 * @param options IntersectionObserverInit
 * @param externalState React.ComponentState[]
 */
declare const useObserver: UseObserver;
export default useObserver;