import { Header } from "har-format";
import { KvTuple } from "../typing/waterfall";
/**
 * @param headers List of `Header` to search in
 * @param headerName Name of `Header` to find
 */
export declare function hasHeader(headers: Header[], headerName: string): boolean;
/**
 * Returns the fist instances of `headerName` in `headers`
 * @param headers List of `Header` to search in
 * @param headerName Name of `Header` to find
 */
export declare function getHeader(headers: Header[], headerName: string): string;
/**
 * Returns all instances of `headerName` in `headers` as `KvTuple`
 * @param headers List of `Header` to search in
 * @param headerName Name of `Header` to find
 */
export declare function getHeaders(headers: Header[], headerName: string): KvTuple[];