title: Can't render recurring events using rrule plugin in fullcalendar
body: <p>I'm trying to render reccurring events in Angular using fullcalendar 4.0.0-alpha2 and RRULE.</p>
  
  <p>angular.json:</p>
  
  <pre><code>"scripts": [
      "node_modules/fullcalendar/dist/fullcalendar.js",
      "node_modules/rrule/dist/es5/rrule.js",
      "node_modules/fullcalendar/dist/plugins/rrule.min.js"
  ]
  </code></pre>
  
  <p>mycomponent.component.ts:</p>
  
  <pre><code>import { Calendar } from 'fullcalendar';
  import { RRule } from "rrule";
  
  ngOnInit(): void {
  
      const rule = new RRule({
          freq: RRule.DAILY,
          interval: 1,
          byweekday: [RRule.MO, RRule.FR],
          dtstart: new Date(Date.UTC(2018, 1, 1, 10, 30)),
          until: new Date(Date.UTC(2020, 12, 31))
      });
  
      var calendarEl = document.getElementById('calendarDirectTest');
  
      var calendar = new Calendar(calendarEl, {
          events: [
              {
                  "title": "Test A",
                  "start": "2018-10-09T16:00:00",
                  rrule: rule
              }
          ]
      });
  
      calendar.render();
  }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/TOjsu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TOjsu.png" alt="Result"></a></p>
  
  <p><strong>The event renders but just once, meaning fullcalendar completely ignores the RRULE property, despite me including the rrule library AND the rrule plugin.</strong></p>
  
  <p>This is the documentation regarding that plugin:
  <a href="https://fullcalendar.io/docs/v4/rrule-plugin" rel="nofollow noreferrer">https://fullcalendar.io/docs/v4/rrule-plugin</a></p>
  
  <p>The only thing that I see that's different is the way they import the connector / plugin, which is:</p>
  
  <pre><code>import 'fullcalendar/plugins/rrule';
  </code></pre>
  
  <p>But that doesn't work on Angular, unless I'm missing something.</p>
  
  <p>Thank you</p>