import { Headers } from 'node-fetch';
import { Readable } from 'stream';
/**
 * 处理返回的头部信息
 * @param headers Headers
 * @returns
 */
export declare const extractHeaders: (headers: Headers) => string;
/**
 * 使用stream-to-promise的方式，处理流并将其转换为完整的字符串或缓冲区
 * @param stream
 * @returns Promise<string>
 */
export declare const getStreamData: (stream: Readable) => Promise<string>;
export declare const buildErrorMessage: (response: any, contentType: any, responseHeaders: any) => Promise<string>;