Node Build and Watch Script for static websites using sass, js (no Webpack necessary)

build.js

/*
  // Add these to package.json and do `npm install --only=dev`
  // Add this file to project root, and then do `node build`
    
  "devDependencies": {
    "@babel/core": "^7.0.0-beta.34",
    "@babel/preset-env": "^7.0.0-beta.34",
    "babel-cli": "^6.26.0",
    "babelify": "^8.0.0",
    "browserify": "^14.5.0",
    "node-sass": "^4.7.2",
    "node-watch": "^0.5.5"
      }
*/

const fs = require('fs')
const browserify = require('browserify')
const babelify = require('babelify')
const sass = require('node-sass')
const watch = require('node-watch')

let jsPath = {
  get: './js/main.js',
  put: './public/js/bundle.js'
}

let cssPath = {
  get: './sass/style.sass',
  put: './public/css/style.css'
}

const jsfy = () => {
  browserify({ debug: true })
    .transform(babelify)
    .require(jsPath.get, { entry: true })
    .bundle()
    .on('error', function (err) { console.log('Error: ' + err.message) })
    .pipe(fs.createWriteStream(jsPath.put))
}

const cssfy = () => {
  sass.render({
    file: cssPath.get
  }, function (err, result) {
    fs.writeFile(cssPath.put, result.css, (e) => {
      if (e) console.log(console.log('[ERR] : ' + e))
    })
  })
}

function start() {
  try {
    jsfy()
    cssfy()
  } catch (e) {
    console.log('[ERR] : ' + e)
  }
}

start()

watch(['js', 'sass'],
  {
    recursive: true
  },
  start
)