Event when server starts listening

[rightaway]

In a koa app I'd like to be able to do something when the server's listen() completes and it is ready to accept connections. This is what I have

app.listen().on("error", errorCallback)

Is there a ready event like this?

app.listen().on("error", errorCallback).on("ready", readyCallback)

[masx200]

on("listening", readyCallback)