import { AfterViewInit, ElementRef, InjectionToken, OnDestroy } from '@angular/core';
import { Subject } from 'rxjs';
import * as i0 from "@angular/core";
export declare const ON_SCROLL_TOKEN: InjectionToken<string>;
export declare class NggOnScrollDirective implements AfterViewInit, OnDestroy {
    private elementRef;
    onScroll$: Subject<unknown>;
    destroy$: Subject<unknown>;
    constructor(elementRef: ElementRef);
    ngAfterViewInit(): void;
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<NggOnScrollDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<NggOnScrollDirective, "[nggOnScroll]", never, {}, {}, never, never, false, never>;
}