export interface SingleElementObserverOptions {
    root?: Element | Document | null;
    rootMargin?: string;
    threshold?: number | number[];
    active?: boolean;
}
export interface OnIntersect {
    (el: HTMLElement): any;
}
export declare function useIntersectionObserver(cb: OnIntersect, options?: SingleElementObserverOptions): (el: HTMLElement | null) => void;