Drop support for node v8

[hueniverse]

Pave the way for new language features such as for await...of.

[mcollina]

Wow! This is a big change.

I would like to have Readable stream async iterator support out of experimental asap. It would be good to have your feedback on that, as it’s probably a feature that you plan to use.

[hueniverse]

@mcollina point me in the right direction... happy to play with it.

[kanongil]

With current v10, BigInt support is also included, and URL is exposed as a global (no need to require('url')).

It also allows us to use util.types for type detection in Hoek.

[mcollina]

@hueniverse nodejs/readable-stream#333. I also wrote https://github.com/mcollina/stream-iterators-utils#utilstoreadablegenerator-opts ( I'd like to get it into core at some point).

Overall the question is that:

const http = require('http')

async function handle (req, res) {
  let chunks = []
  for await (let chunk of req) {
    chunks.push(chunk)
  }
  res.end()
}

http.createServer(function (req, res) {
  handle(req, res).catch(() => res.end())
})

Is stable for the Hapi community to use. It also works on files and on any other stream from core or created via readable-stream.