Load PouchDB with AngularJS

pouchdb.service.js

angular.module('myModule').service('loadPouchDB', ['$window', '$q',
  function ($window, $q) {
    $window.Promise = $q.when();
    var deferred = $q.defer();
    function loadScript() {
      // Use global document since Angular's $document is weak
      var script = document.createElement('script');
      document.body.appendChild(script);
      script.onload = function () {
        $window.removeEventListener('load', loadScript, false);
        deferred.resolve();
      };
      script.src = 'vendor/pouchdb.js';
    }
    $window.addEventListener('load', loadScript, false);
    return deferred.promise;
  }]);