import { Response } from 'express';
import { Headers } from 'node-fetch';
import { IncomingHttpHeaders } from 'http';
export declare const mergeHeaders: (...headers: Headers[]) => Headers;
export declare const getHeader: (headers: IncomingHttpHeaders, header: string) => string | null;
export declare const copyHeaders: (resp: Response, headers: Headers, copy?: string[], ignore?: string[]) => void;
export declare const getHeaders: (reqHeaders: IncomingHttpHeaders, ignoreHeaders?: string[]) => Headers;