import { AfterViewInit, ElementRef } from "@angular/core";
import { UpdateHostClassService } from "../services/update-host-class.service";
export declare class PlaceholderDirective implements AfterViewInit {
    private _updateHostClassService;
    private elementRef;
    constructor(_updateHostClassService: UpdateHostClassService, elementRef: ElementRef);
    visible: boolean;
    private _visible;
    size?: "small" | "standard";
    readonly ariaHidden: boolean | null;
    ngAfterViewInit(): void;
}