import { Getter } from "../types/types";
import { IncomingMessage } from "http";
import { Http2ServerRequest } from "http2";
export declare type HeaderSetterParams = string[] | string;
export declare type HeaderGetterResult = HeaderSetterParams | undefined;
export declare type HeaderGetter = Getter<HeaderGetterResult>;
export declare const getHead: (req: IncomingMessage | Http2ServerRequest, key: string) => HeaderGetterResult;