ES6+ in Cloud Functions for Firebase - input for the last 3 examples

CF4F-ES6-2|input.js

// input - async/awaiy with CommonJS module syntax
const functions = require('firebase-functions');

// returns a string after 5 seconds
const message = () => {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve(`from Babelified Cloud Functions!`)
    }, 5000)
  })
}

module.exports.helloWorld = functions.https.onRequest(async (req, res) => {
  let world = await message();
  res.status(200).send(`Hello ${world}`);
})