export interface IntersectionObserverMockInterface extends IntersectionObserver {
    target: Element | null;
    scrollCallback: IntersectionObserverCallback;
    onScroll(e: Event): void;
}
export declare class IntersectionObserverMock implements IntersectionObserverMockInterface {
    root: IntersectionObserver['root'];
    rootMargin: IntersectionObserver['rootMargin'];
    scrollMargin: IntersectionObserver['scrollMargin'];
    thresholds: IntersectionObserver['thresholds'];
    target: Element | null;
    disconnect: IntersectionObserver['disconnect'];
    observe: IntersectionObserver['observe'];
    takeRecords: IntersectionObserver['takeRecords'];
    unobserve: IntersectionObserver['unobserve'];
    scrollCallback: IntersectionObserverCallback;
    onScroll(e: Event): void;
    constructor(callback: IntersectionObserverCallback);
}
export declare function mockIntersectionObserver(): void;
/**
 * Dispatches the custom scroll event used by the viewable directive.  Used
 * in tandem with the IntersectionObserverMock to perform the scroll.
 */
export declare function dispatchCustomScroll(eventDetails?: Partial<IntersectionObserverEntry>): void;