/// <reference types="node" />
import { BasePlugin } from '@opentelemetry/core';
import type { ClientRequest, RequestOptions } from 'http';
import * as url from 'url';
import { Func, Http, HttpPluginConfig, HttpRequestArgs } from './types';
/**
 * Http instrumentation plugin for Opentelemetry
 */
export declare class HttpPlugin extends BasePlugin<Http> {
    readonly moduleName: string;
    readonly version: string;
    readonly component: string;
    protected _config: HttpPluginConfig;
    /** keep track on spans not ended */
    private readonly _spanNotEnded;
    constructor(moduleName: string, version: string);
    /** Patches HTTP incoming and outcoming request functions. */
    protected patch(): typeof import("http");
    /** Unpatches all HTTP patched function. */
    protected unpatch(): void;
    /**
     * Creates spans for incoming requests, restoring spans' context if applied.
     */
    protected _getPatchIncomingRequestFunction(): (original: (event: string, ...args: unknown[]) => boolean) => (this: {}, event: string, ...args: unknown[]) => boolean;
    /**
     * Creates spans for outgoing requests, sending spans' context for distributed
     * tracing.
     */
    protected _getPatchOutgoingRequestFunction(): (original: Func<ClientRequest>) => Func<ClientRequest>;
    protected _getPatchOutgoingGetFunction(clientRequest: (options: RequestOptions | string | url.URL, ...args: HttpRequestArgs) => ClientRequest): (_original: Func<ClientRequest>) => Func<ClientRequest>;
    /**
     * Attach event listeners to a client request to end span and add span attributes.
     *
     * @param request The original request object.
     * @param options The arguments to the original function.
     * @param span representing the current operation
     */
    private _traceClientRequest;
    private _incomingRequestFunction;
    private _outgoingRequestFunction;
    private _startHttpSpan;
    private _closeHttpSpan;
    private _callResponseHook;
    private _callRequestHook;
    private _safeExecute;
}
export declare const plugin: HttpPlugin;