cookie.js

export default function(cookieName) {
  var re = new RegExp('[; ]'+cookieName+'=([^\\s;]*)'),
      sMatch = (' '+document.cookie).match(re);

  if(cookieName && sMatch) {
    return unescape(sMatch[1]);
  }
}

ember_csrf.js

import Ember from 'ember';
import getCookie from 'cookie';

export default {
  name: "csrf",
  initialize: function() {
    Ember.$.ajaxPrefilter(function(options, originalOptions, xhr) {
      var token = getCookie("X-CSRF-TOKEN");
      xhr.setRequestHeader("X-CSRF-Token", token);
    });
  }
};