Method getDefaultActionAlias

src/custom-element.js:467–473

* Get the default action alias. * @return {?string}

()

     * @return {?string}
     */
    getDefaultActionAlias() {
      devAssert(
        this.isUpgraded(),
        'Cannot get default action alias of unupgraded element'
      );
      return this.impl_.getDefaultActionAlias();
    }

    /** @return {boolean} */
    isBuilding() {