import { AsyncSetImageReturnType } from '../types/image-viewer';
export declare const versions = "1.0.25";
/**
 * Verify illegal image paths, such as null, undefined, ''
 *
 * @returns AsyncSetImageReturnType
 */
export declare const asyncVerifyIllegalImage: (images: string[]) => AsyncSetImageReturnType;
/**
 * debounce
 *
 * @param { Function } fun
 * @param { Number } delay
 * @author qiuny
 * @returns
 */
export declare const debounce: (fun: Function, delay: number) => (this: any) => void;
export declare const getTimeStamp: () => string;
/**
 * downloadExe
 *
 * @param { String } url image url
 * @param { String } fileName
 */
export declare const downloadExe: (url: string, fileName?: string) => void;
export declare const getUserAgent: () => boolean;
export declare const isTrueArray: (value: any) => boolean;