🚀 Feature Proposal

Support ESM module

Motivation

In the node14 the ESM modules will be no longer experimental

Example

// demo.mjs

import fs from 'fs'

export default function app (fastify, opts, next) {
  fastify.get('/', function (request, reply) {
    reply.send(fs.readFileSync('./package.json'))
  })

  next()
}

And then run it with fastify start demo.mjs

This feature should:

• load the arg file as ESM when the file ends with mjs or the type in the package.json is module

The watching feature should be updated accordingly.

To support node10, it will be needed a --esm --no-esm flag because it doesn't support the type:module loading as node>=12 does