import http from 'node:http';
import net from 'node:net';
export interface ProxyUpstream {
    host: string;
    username?: string;
    password?: string;
    useHttps?: boolean;
}
export interface ProxyStats {
    bytesRead: number;
    bytesWritten: number;
}
/**
 * Describes an outbound connection established by a proxy instance.
 * This can be either a direct connection to the target host,
 * or a connection to an upstream proxy.
 */
export interface Connection {
    connectionId: string;
    partitionId?: string;
    upstream: ProxyUpstream | null;
    socket: net.Socket;
    host: string;
}
/**
 * Standard logging interface, compatible with `console` and `@flexent/logger`.
 */
export interface Logger {
    info(message: string, object?: unknown): void;
    warn(message: string, object?: unknown): void;
    error(message: string, object?: unknown): void;
    debug(message: string, object?: unknown): void;
}
export declare function makeBasicAuthHeader(config: ProxyUpstream): string;
export declare function makeProxyUrl(config: ProxyUpstream): string;
export declare function makeRequestHead(req: http.IncomingMessage): string;
export declare function makeResponseHead(res: http.IncomingMessage): string;
export declare function createUpstreamUrl(upstream: ProxyUpstream | null): string;
export declare function createConnectionId(): string;