🚀 Feature Proposal

From the next version of Fastify, I would love to decouple even more Express middlewares from the core framework.
The current solution is to integrate Middie with Fastify and expose it via the use API.
I think we should design a new plugin that offers this functionality (and at the same time remove the use API from core); technically is possible since Fastify offers everything we might need to achieve this goal.
Moreover, if we expose this functionality as a plugin, we could even improve the Express support, and apply many other modifications to the request object that we are currently not doing in core to avoid a performance hit.
Finally, we will remove the confusion generated by hooks vs middlewares.

Motivation

• Discourage the use of Middlewares and encourage the use of our Hooks.
• Drop an API from core that does not need to be there, and increases the internal complexity.
• Improved Express compatibility.
• Performances++ if you don't need Express compatibility.

Example

const fastify = require('fastify')()
fastify
  .register(require('fastify-express'))
  .after(() => {
    fastify.use(require('express-stuff'))
  })
  .listen(3000)

What do you think?
What can we put inside this plugin to improve express compatibility?
Any feedback is welcome!