import { ElementRef } from '@angular/core';
import { RxVirtualScrollElement } from './model';
import * as i0 from "@angular/core";
export declare class RxVirtualScrollWindowDirective implements RxVirtualScrollElement {
    private readonly document;
    private readonly elementRef;
    readonly elementScrolled$: import("rxjs").Observable<void>;
    getElementRef(): ElementRef<HTMLElement>;
    measureOffset(): number;
    static ɵfac: i0.ɵɵFactoryDeclaration<RxVirtualScrollWindowDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<RxVirtualScrollWindowDirective, "rx-virtual-scroll-viewport[scrollWindow]", never, {}, {}, never, never, true, never>;
}