yvan-ext/src/controls/toolbar/tbseparator.js

import _ from 'lodash'
import $ from 'jquery'

export default function () {
  /**
   *
   */
  const ct = Ext.toolbar.Separator.prototype.constructor
  Ext.toolbar.Separator.override({
    constructor: function (config) {
      const newConfig = _.defaultsDeep({}, config, {
        cls: ['yvan_design']
      })
      ct.call(this, newConfig)
    }
  });
}