import { IncomingHttpHeaders } from 'http';
export declare const singleValueHeaders: Set<string>;
/**
 * A map from strings to strings or array of strings
 *
 * @public
 */
export type Headers = IncomingHttpHeaders;
export declare const headersContainer: () => IncomingHttpHeaders;
export declare const appendHeader: (headers: IncomingHttpHeaders, headerName: string, headerValue: string) => void;
export declare const processRawHeaders: (rawHeaders: string[]) => IncomingHttpHeaders;