Method thenAlways

src/motion.js:190–193

* Callback for regardless whether the motion succeeds or fails. * @param {function()=} opt_callback * @return {!Promise}

(opt_callback)

   * @return {!Promise}
   */
  thenAlways(opt_callback) {
    const callback = opt_callback || NOOP_CALLBACK_;
    return /** @type {!Promise} */ (this.then(callback, callback));
  }

  /**
   * @return {!Promise}