<!--
@license
Copyright (c) 2017 Vaadin Ltd.
This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
-->
<link rel="import" href="../../polymer/lib/utils/flattened-nodes-observer.html">

<script>
  window.Vaadin = window.Vaadin || {};
  window.Vaadin.Grid = window.Vaadin.Grid || {};

  /**
   * @polymerMixin
   */
  Vaadin.Grid.DynamicColumnsMixin = superClass => class DynamicColumnsMixin extends superClass {

    /** @protected */
    ready() {
      super.ready