Untitled

export function sum (a, b) {
  return a + b
}

'use strict'
import sum from 'functions'
let a = 10
let b = 5
console.log(sum(a, b))

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>ES6 Getting Started</title>
    <meta name="description" content="An example of how to use ES6">
  </head>
  <body>
    <p>
      View the console
    </p>
    <script src="dist/main.js">
    </script>
  </body>
</html>

{
  "name": "my-project",
  "version": "1.0.0",
  "scripts": {
    "build": "babel src -d dist"
  },
  "devDependencies": {
    "babel-cli": "^6.4.5"
  }
}