build-static.js

/* // call this from your package.json like: 
"scripts": {
  "build-static": "webpack && node lib/build-static.js"
}
*/

var shell = require('shelljs')

shell.cp('-f', 'app/index.html', 'build/public/index.html')

var fs = require('fs')
fs.readFile('build/public/index.html', 'utf8', function (err, data) {
  if (err) {
    return console.log(err)
  }
  var timestamp = Date.now()
  var result = data.replace('SCRIPT_URL', '/main.js?cache=' + timestamp).replace('STYLE_URL', '/main.css?cache=' + timestamp)

  fs.writeFile('build/public/index.html', result, 'utf8', function (error) {
    if (error) {
      return console.log(error)
    }
  })
})