text: /*
  * required polyfills
  */
  
  /** IE9, IE10 and IE11 requires all of the following polyfills. **/
  // import "core-js";
  // import 'core-js/features/symbol'
  // import 'core-js/features/object'
  // import 'core-js/features/function'
  // import 'core-js/features/parse-int'
  // import 'core-js/features/parse-float'
  // import 'core-js/features/number'
  // import 'core-js/features/math'
  // import 'core-js/features/string'
  // import 'core-js/features/date'
  // import 'core-js/features/array'
  // import 'core-js/features/regexp'
  // import 'core-js/features/map'
  // import 'core-js/features/weak-map'
  // import 'core-js/features/set'
  // import 'core-js/features/set/map';
  
  /** IE10 and IE11 requires the following for the Reflect API. */
  // import 'core-js/features/reflect';
  
  /** Evergreen browsers require these. **/
  // Used for reflect-metadata in JIT. If you use AOT (and only Angular decorators), you can remove.
  // import 'core-js/features/reflect'
  
  // CustomEvent() constructor functionality in IE9, IE10, IE11
  (function () {
  
    if ( typeof window.CustomEvent === "function" ) return false
  
    function CustomEvent ( event, params ) {
      params = params || { bubbles: false, cancelable: false, detail: undefined }
      var evt = document.createEvent( 'CustomEvent' )
      evt.initCustomEvent( event, params.bubbles, params.cancelable, params.detail )
      return evt
    }
  
    CustomEvent.prototype = window.Event.prototype
  
    window.CustomEvent = CustomEvent
  })()
  
  if (!Element.prototype.matches) {
    Element.prototype.matches =
      Element.prototype.msMatchesSelector ||
      Element.prototype.webkitMatchesSelector;
  }
  
  if (!Element.prototype.closest) {
    Element.prototype.closest = function(s) {
      var el = this;
  
      do {
        if (Element.prototype.matches.call(el, s)) return el;
        el = el.parentElement || el.parentNode;
      } while (el !== null && el.nodeType === 1);
      return null;
    };
  }
  