/** 下载文本 */
export declare function downloadText(fileName: string, text: string, type?: string): void;
/** 下载某个 ArrayBuffer */
export declare function downloadArraybuffer(arrayBuffer: ArrayBuffer, type: string, fileName?: string): void;
/** 下载某个 URL 对应的文件 */
export declare function downloadUrl(url: string, fileName?: string): void;
export declare function arrayBufferToFile(arrayBuffer: ArrayBuffer, fileType?: string, fileName?: string): File;
/** 将某个 Blob 变为文件对象 */
export declare function blobToFile(theBlob: Blob, fileName?: string): File;
/** 将某个文件对象转化为 ArrayBuffer */
export declare function readFileAsArrayBufferAsync(file: File): Promise<ArrayBuffer>;
/** 执行文件的 MD5 计算操作 */