feat: add listen hook in node-server preset

[lewebsimple]

In the context of Nuxt 3, it's easy to access the server instance using the listen hook in development, but in production it's quite hard (and it seems overkill) to override the nitropack node-preset just to hook stuff to the http server instance like WebSocket.

Is there any issue with exposing this hook ?

[stafyniaksacha]

Hi @lewebsimple

The listen hooks does not raise when nitro server is listening, but when dev server is started (see here)

The server used by nitro in development is served with a unix socket (on unix) or on another sub port (your dev server doesn't restart when reloading, whereas this will) (see here)

Also note that in the listen event you will not be able to interact with nuxtApp neither with nitroApp

I've made a simple POC to listen to websockets on nuxt 3 here: https://github.com/stafyniaksacha/nuxt-poc-websockets
It uses a custom nitro node preset to emit an event that can then be handled in a nitro plugin. Maybe this event can be inserted in default preset, but it won't work for dev mode. (that's why I create a new Server instance in dev mode) (see here)