carbon-custom-elements/es/polyfills/toggle-class.js

A Carbon Design System variant that's as easy to use as native HTML elements, with no framework tax, no framework silo.

/**
 * @license
 *
 * Copyright IBM Corp. 2019
 *
 * This source code is licensed under the Apache-2.0 license found in the
 * LICENSE file in the root directory of this source tree.
 */
const missingNativeDOMTokenListToggleForce = (() => {
  const elem = document.createElement('div');
  const randomClass = `_random_class_${Math.random().toString(36).slice(2)}`;
  elem.classList.toggle(randomClass, false);
  return elem.classList.contains(randomClass);
})();

if (missingNativeDOMTokenListToggleForce) {
  (() => {
    const origToggle = DOMTokenList.prototype.toggle;

    DOMTokenList.prototype.toggle = function toggleDOMTokenList(name, add) {
      return arguments.length < 2 || this.contains(name) === !add ? origToggle.call(this, name) : add;
    };
  })();
}
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