Add .d.ts for TypeScript

[shuhei]

No description provided.

[shuhei]

Something like this?

import * as dns from "dns";
import { EventEmitter } from "events";
import OriginalHttpAgent, { HttpsAgent as OriginalHttpsAgent } from "agentkeepalive";

declare interface PollingOptions {
  interval?: number;
  retries?: number;
}

declare class Poller extends EventEmitter {
  constructor(options: PollingOptions): Poller;
  start(): void;
  stop(): void;
  getLookup(): typeof dns.lookup;
}

declare class DnsPolling extends EventEmitter {
  constructor(): DnsPolling;
  getLookup(hostname: string): typeof dns.lookup;
  stop(): void;
}

declare class HttpAgent extends OriginalHttpAgent {
}
declare class HttpsAgent extends OriginalHttpsAgent {
}

[mxs]

This would be nice!