/// <reference types="scrollreveal" />
import { ElementRef } from '@angular/core';
import { NgsRevealConfig } from './ngs-reveal-config';
import { WindowService } from './window.service';
/**
 * Marker interface to indicate that an object (typically `window`) has `scrollreveal` property.
 */
export interface NgsHasScrollreveal {
    scrollReveal: scrollReveal.ScrollRevealObject;
}
/**
 * Service to inject in directives to use ScrollReveal JS.
 * It delegates the work to SR, when DOM manipulation is possible (i.e app is not running in a web worker for e.g).
 * If not possible, most methods simply do nothing, as DOM elements are not available anyway.
 */
export declare class NgsRevealService {
    private config;
    private windowService;
    private sr;
    private window;
    constructor(config: NgsRevealConfig, windowService: WindowService);
    /**
     * Method to reveal a single DOM element.
     * @param elementRef  a reference to the element to reveal
     * @param config      (optional) custom configuration to use when revealing this element
     */
    reveal(elementRef: ElementRef, config?: NgsRevealConfig): scrollReveal.ScrollRevealObject;
    /**
     * Method to reveal a set of DOM elements.
     * @param parentElementRef  the parent DOM element encaspulating the child elements to reveal
     * @param selector          a list of CSS selectors (comma-separated) that identifies child elements to reveal
     * @param interval          (optional) interval in milliseconds, to animate child elemnts sequentially
     * @param config            (optional) custom configuration to use when revealing this set of elements
     */
    revealSet(parentElementRef: ElementRef, selector: string, interval?: number, config?: NgsRevealConfig): scrollReveal.ScrollRevealObject;
    /**
     * Method to synchronize and consider newly added child elements (for e.g when child elements were added asynchronously to parent DOM) .
     */
    sync(): void;
}