Unable to pass options when using with node-fetch

[bmxpiku]

Hey,
Im failing to implement this library for node-fetch, and maybe you will have some idea:

import https from 'https';
// @ts-ignore
import { lookup } from 'lookup-dns-cache';

const dnsAgent = (): https.Agent => new https.Agent({
  lookup: lookup(4),
  keepAlive: true,
});

// and then usage within fetch
await fetch(uri, {
      method: 'POST',
      body: JSON.stringify(requestParams),
      headers: { 'Content-Type': 'application/json' },
      agent: dnsAgent,
    });

It fails with an error "options must be an object or an ip version number"
which I see in library code, but passing object {family: 4} also causes same failure