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 }