@recogito/recogito-client-core/src/polyfills/index.js

Core functions, classes and components for RecogitoJS

import 'core-js/stable';
import 'regenerator-runtime/runtime';

/**
 * Adds DOM polyfills that babel polyfill doesn't include
 */
if (!Element.prototype.matches) {
  Element.prototype.matches = Element.prototype.msMatchesSelector ||
    Element.prototype.webkitMatchesSelector;
}

if (!Element.prototype.closest) {
  Element.prototype.closest = function(s) {
    let el = this;

    do {
      if (Element.prototype.matches.call(el, s)) return el;
      el = el.parentElement || el.parentNode;
    } while (el !== null && el.nodeType === 1);
    return null;
  };
}