Promise interface

[silverwind]

Been working with a lot of async/await lately and a callback API is really hindering there. I think we can return promises if the callback argument is not a function. Or should we go the route of completely removing the callback interface and do a major version bump?

[mafintosh]

I'm too dependent on the interface in upstream deps to make a breaking change like removing the cbs so i'd very much prefer to keep that.

You can easily util.promisify this api as it is now right?

[silverwind]

I'm fine if you wanna go the non-breaking route and support both. util.promisify is of course an option, but it's not as "clean" if you know what I mean :)

[mafintosh]

What about adding promises.js that exports the functions with util.promisify? then it's less bloated and to use promises you just do require('dns-socket/promises') ?

[silverwind]

We can actually have both callbacks and promises when we test whether the last argument is a function. Or would this too brittle for your tastes?

[realhidden]

If you only use the .query function, this one is a simple solution:

const socket = dnsSocket({...});
const qsocket = promisify(socket.query.bind(socket));