/**
 * 从 URL 中提取图片扩展名
 */
export declare function getImageExtensionFromUrl(url: string): string;
/**
 * 下载图片并转换为 base64
 */
export declare function downloadImageAsBase64(url: string): Promise<string>;
/**
 * 下载图片并返回二进制 Buffer
 */
export declare function downloadImageAsBinary(url: string): Promise<Buffer>;
//# sourceMappingURL=imageDownloader.d.ts.map