export declare class ImageService {
    private static instance;
    private readonly avatarServices;
    private readonly photoServices;
    private bestAvatarService;
    private bestPhotoService;
    private checked;
    private checking;
    static getInstance(): ImageService;
    checkAvailability(): Promise<void>;
    getAvatarUrl(size?: number): string;
    getImageUrl(width?: number, height?: number): string;
    private doCheck;
    private probeServices;
    private pickBest;
}