ZEIT's Micro meets Futures

flutures-micro.js

const { readFile } = require('fs')
const { isFuture, node, encase, after } = require('fluture')

const futurize  = (handler) => async (req, res) => {
  const result = await handler(req, res)
  return isFuture(result) ? result.promise() : result
}

module.exports = futurize(
  async (req, res) => {
    await wait(500)
    return after(500, './package.json').chain(getPackageVersion)
  }
)

// Helpers
const wait = (ms) => new Promise((resolve) => setTimeout(resolve, ms))

const getPackageVersion = (file) =>
  node(done => { readFile(file, 'utf8', done) })
    .chain(encase(JSON.parse))
    .map(x => x.version)