export declare class LightboxService {
    filesUrlElement: HTMLElement;
    actionIconElement: HTMLElement;
    content: HTMLElement;
    page: HTMLElement;
    constructor();
    open(filesUrl: string[], closeOut?: boolean, actionIcon?: (position: string) => void, imageIcon?: string): boolean;
    keydownHandler($event: any): void;
    close(): boolean;
    private isImage;
    private isPdf;
    private generateImage;
    private generateImageIcon;
    private next;
    private prev;
}