Async await support within use

[mcollina]

As titled

cc @allevo

[allevo]

I'd like to build a npm module to handle this automatically. Maybe this weekend I figure out how to do this. In this case, are you Interested in that npm?

[mcollina]

this seems pretty custom, but I’ll be happy to see what the ecosystem offers.

[delvedor]

LGTM

[delvedor]

IMHO what we should make very clear, is that use must be called synchronously.
For example the following should not be valid:

getStruff()
  .then(stuff => {
    app.use(stuff)
  })

We should be able to detect it and throw an error.
Or find a way to support it, but I don't like it so much, avvio should be used as single system to handle asynchronous bootstrap, we should discourage mixed approaches.

The above example for instance, should be like this:

app.use(async function (app, opts, next) {
  const stuff = await getStruff()
  app.use(stuff, next)
})

[mcollina]

@delvedor can you please provide another (bigger) example? It seems that is working.

[allevo]

@mcollina try https://github.com/allevo/three-corners