"object" without a required "getBoundingClientRect" method.`);return t}_createPopper(){if(void 0===s)throw new TypeError("Bootstrap's dropdowns require Popper (https://popper.js.org)");let t=this._element;"parent"===this._config.reference?t=this._parent:l(this._config.reference)?t=c(this._config.reference):"object"==typeof this._config.reference&&(t=this._config.reference);const e=this._getPopperConfig();this._popper=s.createPopper(t,this._menu,e)}_isShown(){return this._menu.classList.contains(At)...