export declare const hash: (path: string, key: string, salt: string) => Promise<Uint8Array<ArrayBufferLike>>;
export declare const sign: (path: string, key: string, salt: string) => Promise<unknown>;
export declare const getThumbnailtUrl: (url: string, payload: {
    width: number;
    key: string;
    salt: string;
    prefix: string;
}) => Promise<string>;