ES6 Directives in Angular - Directive registration

directives.js

import { Inject } from 'decorators';
import * as directives from './module';

function factoryize(directive) {
  return directive.$inject
    ? Inject(...directive.$inject)((...dependencies) => new directive(...dependencies))
    : () => new directive();
}

const directivesModule = angular.module('app.directives', []);

Object.keys(directives).forEach(key => {
  if(!directives[key].__directive) {
    console.warn(`Directive ${key} is missing the @Directive decorator.`);
    return;
  }

  const { name } = directives[key].__directive;
  directivesModule.directive(name, factoryize(directives[key]));
});

export default directivesModule.name;