/**
 * 图片懒加载
 */
export declare const lazyLoadImg: () => void;
/**
 * 判断浏览器是否支持IntersectionObserver
 */
export declare const supportLazy: boolean;
/**
 * base64转Blob
 * @param b64Url
 * @param contentType
 * @param sliceSize
 */
export declare const b64toBlob: (b64Url: string, contentType?: string, sliceSize?: number) => Blob;
/**
 * 复制base64格式的图片
 * @param b64Url
 * @param tips
 */
export declare const copyBase64Img: (b64Url: string, tips?: boolean | undefined) => void;