in js/bootstrap.bundle.js [1498:1517]
constructor(element, config) {
super(element, config);
this._isTransitioning = false;
this._triggerArray = [];
const toggleList = SelectorEngine.find(SELECTOR_DATA_TOGGLE$4);
for (const elem of toggleList) {
const selector = SelectorEngine.getSelectorFromElement(elem);
const filterElement = SelectorEngine.find(selector).filter(foundElement => foundElement === this._element);
if (selector !== null && filterElement.length) {
this._triggerArray.push(elem);
}
}
this._initializeChildren();
if (!this._config.parent) {
this._addAriaAndCollapsedClass(this._triggerArray, this._isShown());
}
if (this._config.toggle) {
this.toggle();
}
}