import { Observable, SchedulerLike } from 'rxjs';
import { ElementRef } from '@angular/core';
export declare function isElementRef(value: unknown): value is ElementRef;
export declare function supportsIntersectionObserver(): boolean;
export declare type IntersectionObserverConfig = {
    /**throttle emissions, defaults to 50*/
    throttleMs?: number;
    /** scheduler to use for throttling */
    scheduler?: SchedulerLike;
};
export declare function createIntersectionObserver(observeElement: ElementRef | Element, options?: IntersectionObserverInit, cfg?: IntersectionObserverConfig): Observable<IntersectionObserverEntry[]>;