Method unlayoutCallback

src/custom-element.js:1727–1739

* Requests the element to unload any expensive resources when the element * goes into non-visible state. The scope is up to the actual component. * * Calling this method on unbuilt or unupgraded element has no effect. * * @return {boolean} * @package @final * TODO(

()

     * TODO(#31915): remove once R1 migration is complete.
     */
    unlayoutCallback() {
      assertNotTemplate(this);
      if (!this.isBuilt()) {
        return false;
      }
      this.signals_.signal(CommonSignals_Enum.UNLOAD);
      const isReLayoutNeeded = this.impl_.unlayoutCallback();
      if (isReLayoutNeeded) {
        this.reset_();
      }
      this.dispatchCustomEventForTesting(AmpEvents_Enum.UNLOAD);
      return isReLayoutNeeded;
    }

    /** @private */
    unlayout_() {