Promisify Papa Parse for Angular

papa-parse-angular-alias.js

(function () {
  'use strict';
  // Papa Parse: http://papaparse.com/
  // Allows Angular apps to neatly inject `Papa` in components.
  angular.module('appName').constant('Papa', window.Papa);
}).call(this);

papa-parse-angular-decorator.js

(function () {
  'use strict';

  function papaDecorator ($delegate, $injector, _) {
    var $q,
        loadDeps;

    // We have to inject these during runtime to avoid circular dependencies
    // from things like `moment` or `$translate`
    loadDeps = function () {
      if (!$q) {
        $q = $injector.get('$q');
      }
    };

    // Promisify Papa Parse
    // Example: Papa.asyncParse(file).then().catch()
    $delegate.Papa.asyncParse = function (file, options) {
      var deferred,
          promisifiedCallbacks;
      loadDeps();
      deferred = $q.defer();
      promisifiedCallbacks = {
        complete: function (response) {
          deferred.resolve(response.data);
        },
        error: deferred.reject
      };
      Papa.parse(file, _.assign({}, options, promisifiedCallbacks));
      return deferred.promise;
    };

    return $delegate;
  }

  angular.module('appName')
    .config([
      '$provide',
      function ($provide) {
        $provide.decorator('$window', [
          '$delegate',
          '$injector',
          '_',
          papaDecorator
        ]);
      }
    ]);
})();