backbone debug

backbone-debug.js

var $bbSetElement = Backbone.View.prototype.setElement;
Backbone.View.prototype.setElement = function setElement(element) {
  if (this.el && this.el !== element) {
    delete this.el.$bbView;
  }

  const domElem = element.jquery ? element[0] : element;
  domElem.$bbView = this;
  domElem.setAttribute(`data-backbone-view`, `true`);
  return $bbSetElement.apply(this, arguments);
};