* @inner\n   */\n  arrow: {\n    /** @prop {number} order=500 - Index used to define the order of execution */\n    order: 500,\n    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */\n    enabled: true,\n    /** @prop {ModifierFn} */\n    fn: arrow,\n    /** @prop {String|HTMLElement} element='[x-arrow]' - Selector or node used as arrow */\n    element: '[x-arrow]',\n  },\n\n  /**\n   * Modifier used to flip the popper's placement when it starts to overlap its\n   * reference...