import { URL } from 'node:url';
import type { Segment, Subsegment } from 'aws-xray-sdk-core';
import type { DiagnosticsChannel } from 'undici-types';
import type { IncomingHttpHeaders } from 'undici-types/header.js';
import type { HttpSubsegment } from '../types/ProviderService.js';
/**
 * Finds the header with the given key and return its value as a string.
 *
 * Over HTTP/1, `undici` publishes the headers as a flat array of encoded key-value pairs;
 * over HTTP/2 it publishes them as an object with lowercase keys.
 *
 * @param headers The response headers published by `undici`
 * @param key The lowercase key to search for
 */
declare const findHeaderAndDecode: (headers: Uint8Array[] | IncomingHttpHeaders, key: string) => string | null;
/**
 * Type guard to check if the given subsegment is an `HttpSubsegment`
 *
 * @param subsegment The subsegment to check
 */
declare const isHttpSubsegment: (subsegment: Segment | Subsegment | undefined) => subsegment is HttpSubsegment;
/**
 * Convert the origin url to a URL object when it is a string and append the path if provided
 *
 * @param origin The request object containing the origin url and path
 */
declare const getRequestURL: (request: DiagnosticsChannel.Request) => URL | undefined;
export { findHeaderAndDecode, getRequestURL, isHttpSubsegment };
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