Micro serve

index.js

const url = require('url')
const fs = require('fs')
const path = require('path')
const { send } = require('micro')
const mime = require('mime')

module.exports = async (req, res) => {
  const parseUrl = url.parse(req.url)
  let file = `.${parseUrl.pathname}`

  fs.exists(file, exist => {
    if (!exist) {
      send(res, 404)
      return
    }

    if (fs.statSync(file).isDirectory()) {
      file += '/index.html'
    }

    fs.readFile(file, (err, data) => {
      if (err) {
        send(res, 500)
      } else {
        res.setHeader('Content-type', mime.getType(file))
        send(res, 200, data)
      }
    })
  })
}