import { AfterContentInit, AfterViewInit, ElementRef } from "@angular/core";
import { PlaceholderDirective } from "./placeholder.directive";
import { UpdateHostClassService } from "../services/update-host-class.service";
export declare class PlaceholderAnimationDirective implements AfterContentInit, AfterViewInit {
    private _updateHostClassService;
    private elementRef;
    constructor(_updateHostClassService: UpdateHostClassService, elementRef: ElementRef);
    animation?: "glow" | "wave";
    placeholder: PlaceholderDirective;
    private animate;
    ngAfterContentInit(): void;
    ngAfterViewInit(): void;
}