import { OnInit, OnChanges, SimpleChange, ElementRef } from '@angular/core';
import { NgsRevealConfig } from '../services/ngs-reveal-config';
import { NgsRevealService } from '../services/ngs-reveal.service';
import { AbstractNgsRevealDirective } from './ngs-reveal-common.directive';
/**
 * Directive to add 'ScrollReveal' functionality to a <b>set of DOM elements</b> (identify via the `[ngsSelector]` attribute) in the page.
 * This directive is meant to be placed on the <b>parent node</b> that contains the child elements to reveal.
 * You can optionally add the `[ngsInterval]` attribute to reveal items sequentially, following the given interval(in milliseconds).
 * You can optionally add the `[ngsSync]` attribute to reveal new child elements that may have been added in the parent node asynchronously.
 *
 */
export declare class NgsRevealSetDirective extends AbstractNgsRevealDirective implements OnInit, OnChanges {
    private elementRef;
    /**
     * Custom configuration to use when revealing this set of elements
     */
    _config: string | NgsRevealConfig;
    /**
     * CSS selector to identify child elements to reveal
     */
    ngsSelector: string;
    /**
     * Sequence interval (in milliseconds) to the reveal child elements sequentially
     */
    ngsInterval: number;
    /**
     * Boolean indicating when the set should be synced, to reveal asynchronously added child elements
     */
    ngsSync: boolean;
    constructor(elementRef: ElementRef, ngsRevealService: NgsRevealService);
    ngOnInit(): void;
    ngOnChanges(changes: {
        [propertyName: string]: SimpleChange;
    }): void;
}