import http from 'http';
import https from 'https';
export declare function resolveProxyUrl(targetUrl: string | undefined, fallbackUrl?: string): string | undefined;
export declare function createHttpProxyAgent(targetUrl: string, customProxyUrl?: string | null, options?: http.AgentOptions): http.Agent;
export declare function createHttpsProxyAgent(targetUrl: string, customProxyUrl?: string | null, options?: https.AgentOptions): https.Agent;
export declare function hasProxyEnvironmentVariables(): boolean;