import { ElementRef, OnInit } from '@angular/core';
import { AnimationBuilder, AnimationPlayer } from '@angular/animations';
import { ObserverService } from './observer.service';
export declare class AnimateInDirective implements OnInit {
    private _observer;
    private el;
    private animationBuilder;
    animateInAnimation: any;
    player: AnimationPlayer;
    constructor(_observer: ObserverService, el: ElementRef, animationBuilder: AnimationBuilder);
    ngOnInit(): void;
    /**
     * Builds and triggers the animation
     * when it enters the viewport
     * @param {boolean} inViewport
     */
    startAnimating(inViewport: boolean): void;
}