shim-jquery-ajax-promise.js

var RSVP = require('rsvp');
var jQuery = require('jquery');

// Log uncaught errors (important)
RSVP.on('error', function (reason) {
  console.error((reason && reason.stack) || reason || 'Error');
});
// Shim the browser window with ES6 Promise
window.Promise = RSVP.Promise;

// Replace jQuery ajax to return an ES6 Promise
jQuery.ajax = function () {
  var ajaxArgs = arguments;
  
  // Return an ES6 Promise rather than a jQuery xhr
  return new Promise(function (resolve, reject) {
    Backbone.$.ajax.apply(Backbone.$, ajaxArgs)
      .done(function (data, textStatus, jqXHR) {
        resolve(data);
      })
      .error(function (jqXHR, status, error) {
        // Always resolve errors to JSON
        reject(jqXHR.responseJSON || { error: jqXHR.responseText || jqXHR.statusText });
      });
  });
};