Method getResources

src/custom-element.js:329–337

* Returns Resources manager. Only available after attachment. It throws * exception before the element is attached. * @return {!./service/resources-interface.ResourcesInterface} * @final * @package

()

     * @package
     */
    getResources() {
      devAssert(
        this.resources_,
        'no resources yet, since element is not attached'
      );
      return /** @type {!./service/resources-interface.ResourcesInterface} */ (
        this.resources_
      );
    }

    /**
     * Whether the element has been upgraded yet. Always returns false when