import { ElementRef, OnInit, ViewContainerRef } from '@angular/core';
/**
 * @ignore
 */
export declare class TooltipDirective implements OnInit {
    private element;
    hostView: ViewContainerRef;
    npTooltip: string;
    direction: direction;
    enterDelay: number;
    leaveDelay: number;
    tooltipDom: HTMLDivElement;
    constructor(element: ElementRef<HTMLImageElement>, hostView: ViewContainerRef);
    ngOnInit(): void;
    onMouseEnter(): void;
    onMouseLeave(): void;
}
/**
 * @ignore
 */
export declare type direction = 'up' | 'bottom' | 'left' | 'right';