ES6 modules with webpack and 6to5

add.js

export default function add(...args){
  return args.reduce( (a,b) => a + b, 0 )
}

main.js

import add from './add.js'

console.log(add(1,3,4,5));

package.json

{
  "name": "gist",
  "version": "0.0.0",
  "description": "",
  "main": "main.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "js": "webpack && node bundle.js"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "6to5": "^1.14.17",
    "6to5-loader": "^0.2.3",
    "webpack": "^1.4.13"
  }
}

webpack.config.js

module.exports = {
  entry: './main.js',
  output: {
    filename: './bundle.js'
  },
  module: {
    loaders: [
      { test: /\.js/, loader: '6to5-loader' }
    ]
  }
}