import { ElementRef, OnDestroy, EventEmitter, NgZone, OnChanges, AfterViewInit, SimpleChanges, AfterContentChecked } from '@angular/core';
import 'rxjs/add/observable/fromEvent';
import 'rxjs/add/operator/debounceTime';
export declare class ScrollDirective implements OnDestroy, AfterViewInit, OnChanges, AfterContentChecked {
    private el;
    private zone;
    debounceTime: number;
    scrolled: EventEmitter<any>;
    scrolledUp: EventEmitter<any>;
    private width;
    private height;
    private contentWidth;
    private contentHeight;
    private childCount;
    private subscriptions;
    constructor(el: ElementRef, zone: NgZone);
    ngAfterViewInit(): void;
    ngOnChanges(changes: SimpleChanges): void;
    ngAfterContentChecked(): void;
    ngOnDestroy(): void;
    update(): void;
    private isChanged();
    private check();
    private enableEvents();
    private disableEvents();
    onWindowResize(): void;
}