Method unmount

src/custom-element.js:728–764

* Unmounts the element and makes it ready for the next mounting * operation. * @final

()

     * @final
     */
    unmount() {
      // Ensure that the element is paused.
      if (this.isConnected_) {
        this.pause();
      }

      // Legacy R0 elements simply unlayout.
      if (!this.R1()) {
        this.unlayout_();
        return;
      }

      // Cancel the currently mounting operation.
      if (this.mountAbortController_) {
        this.mountAbortController_.abort();
        this.mountAbortController_ = null;
      }

      // Unschedule a currently pending mount request.
      const scheduler = getSchedulerForDoc(this.getAmpDoc());
      scheduler.unschedule(this);

      // Try to unmount if the element has been built already.
      if (this.mounted_) {
        this.impl_.unmountCallback();
      }

      // Complete unmount and reset the state.
      this.mounted_ = false;
      this.mountPromise_ = null;
      this.reset_();

      // Prepare for the next mount if the element is connected.
      if (this.isConnected_) {
        this.upgradeOrSchedule_(/* opt_disablePreload */ true);
      }
    }

    /**
     * Returns the promise that's resolved when the element has been mounted. If