Refactor #1884 - For FullCalendar

src/components/fullcalendar/FullCalendar.js

@@ -1,7 +1,6 @@
 import React, { Component } from 'react';
 import PropTypes from 'prop-types';
 import ObjectUtils from '../utils/ObjectUtils';
-import {Calendar} from '@fullcalendar/core';
 
 export class FullCalendar extends Component {
 
@@ -55,13 +54,17 @@ export class FullCalendar extends Component {
         }
     }
 
-    initialize() {
-        this.calendar = new Calendar(this.element, this.config);
-        this.calendar.render();
+    async initialize() {
+        const fullCalendarModule = await import('@fullcalendar/core');
 
-        if (this.props.events) {
-            this.calendar.removeAllEventSources();
-            this.calendar.addEventSource(this.props.events);
+        if (fullCalendarModule && fullCalendarModule.Calendar) {
+            this.calendar = new fullCalendarModule.Calendar(this.element, this.config);
+            this.calendar.render();
+
+            if (this.props.events) {
+                this.calendar.removeAllEventSources();
+                this.calendar.addEventSource(this.props.events);
+            }
         }
     }
 
@@ -76,4 +79,4 @@ export class FullCalendar extends Component {
             <div id={this.props.id} ref={(el) => this.element = el} style={this.props.style} className={this.props.className}></div>
         );
     }
-}
+}