Loading ES6 Modules

ES6 also introduces the concept of a module, which works in a similar way to other languages. Defining an ES6 module is quite easy: each file is assumed to define a module and we'll specify it's exported values using the export keyword. Loading ES6 modules is a little trickier.

In a ES6 compliant browser you would be using the System keyword to load modules asynchronously. To make our code work with the browsers of today, however, we will use SystemJS library as a polyfill:

  <script src="/node_module/systemjs/dist/system.js"></script>
    var promise = System.import('app')
      .then(function() {
      .then(null, function(error) {
        console.error('Failed to load:', error);