Function whenUpgraded

test/unit/preact/test-base-element-runtime.js:27–32

* Returns the upgraded imperative API object, once Preact has actually mounted. * * This technically works with both Bento and Legacy components, returning the * BaseElement instance in the later case. * * @param {!Element} el * @return {!Promise<!Object>}

(el)

 * @return {!Promise<!Object>}
 */
function whenUpgraded(el) {
  return el.ownerDocument.defaultView.customElements
    .whenDefined(el.localName)
    .then(() => el.getImpl())
    .then((impl) => impl.getApi());
}

describes.realWin('PreactBaseElement', {amp: true}, (env) => {
  let win, doc, html;