declare module 'https-proxy-agent' { import * as https from 'https'; namespace HttpsProxyAgent { interface HttpsProxyAgentOptions { host: string; port: number | string; secureProxy?: boolean; headers?: { [key: string]: string; }; [key: string]: any; } } // HttpsProxyAgent doesnt *actually* extend https.Agent, but for my purposes I want it to pretend that it does class HttpsProxyAgent extends https.Agent { constructor(opts: HttpsProxyAgent.HttpsProxyAgentOptions | string); } export = HttpsProxyAgent; }