How to use the @egjs/flicking.DIRECTION_VERTICAL function in @egjs/flicking

/**
 * Copyright (c) 2015 NAVER Corp.
 * egjs projects are licensed under the MIT license
 */
import Flicking from "@egjs/flicking";

// is to through pass Flicking's utils & constants to plugins
const utils = Flicking.utils;
const consts = utils.extend(utils.extend({}, Flicking.consts), {
	DIRECTION_NONE: Flicking.DIRECTION_NONE,
	DIRECTION_LEFT: Flicking.DIRECTION_LEFT,
	DIRECTION_RIGHT: Flicking.DIRECTION_RIGHT,
	DIRECTION_UP: Flicking.DIRECTION_UP,
	DIRECTION_DOWN: Flicking.DIRECTION_DOWN,
	DIRECTION_HORIZONTAL: Flicking.DIRECTION_HORIZONTAL,
	DIRECTION_VERTICAL: Flicking.DIRECTION_VERTICAL,
	DIRECTION_ALL: Flicking.DIRECTION_ALL
});

/**
 * Base class to generate flicking plugin
 * Lifecycle: componentWillMount --> componentMount --> componentDidMount --> componentWillUnmount
 * @ko Flicking 플러그인을 생성하기 위한 기본 클래스
 * @alias eg.Flicking.plugin
 * @private
 */
export default class Plugin {
	/**
	 * Constructor
	 * @param {Object} options Option object 옵션 객체
	 */
	constructor(options = {}) {

}

/**
 * Copyright (c) 2015 NAVER Corp.
 * egjs projects are licensed under the MIT license
 */

var utils = Flicking.utils;
var consts = utils.extend(utils.extend({}, Flicking.consts), {
  DIRECTION_NONE: Flicking.DIRECTION_NONE,
  DIRECTION_LEFT: Flicking.DIRECTION_LEFT,
  DIRECTION_RIGHT: Flicking.DIRECTION_RIGHT,
  DIRECTION_UP: Flicking.DIRECTION_UP,
  DIRECTION_DOWN: Flicking.DIRECTION_DOWN,
  DIRECTION_HORIZONTAL: Flicking.DIRECTION_HORIZONTAL,
  DIRECTION_VERTICAL: Flicking.DIRECTION_VERTICAL,
  DIRECTION_ALL: Flicking.DIRECTION_ALL
});
/**
 * Base class to generate flicking plugin
 * Lifecycle: componentWillMount --> componentMount --> componentDidMount --> componentWillUnmount
 * @ko Flicking 플러그인을 생성하기 위한 기본 클래스
 * @alias eg.Flicking.plugin
 * @private
 */

var Plugin =
/*#__PURE__*/
function () {
  var Plugin =
  /*#__PURE__*/
  function () {

}

/**
 * Copyright (c) 2015 NAVER Corp.
 * egjs projects are licensed under the MIT license
 */

var utils = Flicking.utils;
var consts = utils.extend(utils.extend({}, Flicking.consts), {
  DIRECTION_NONE: Flicking.DIRECTION_NONE,
  DIRECTION_LEFT: Flicking.DIRECTION_LEFT,
  DIRECTION_RIGHT: Flicking.DIRECTION_RIGHT,
  DIRECTION_UP: Flicking.DIRECTION_UP,
  DIRECTION_DOWN: Flicking.DIRECTION_DOWN,
  DIRECTION_HORIZONTAL: Flicking.DIRECTION_HORIZONTAL,
  DIRECTION_VERTICAL: Flicking.DIRECTION_VERTICAL,
  DIRECTION_ALL: Flicking.DIRECTION_ALL
});
/**
 * Base class to generate flicking plugin
 * Lifecycle: componentWillMount --> componentMount --> componentDidMount --> componentWillUnmount
 * @ko Flicking 플러그인을 생성하기 위한 기본 클래스
 * @alias eg.Flicking.plugin
 * @private
 */

var Plugin =
/*#__PURE__*/
function () {
  var Plugin =
  /*#__PURE__*/
  function () {

}

/**
 * Copyright (c) 2015 NAVER Corp.
 * egjs projects are licensed under the MIT license
 */

var utils = Flicking.utils;
var consts = utils.extend(utils.extend({}, Flicking.consts), {
  DIRECTION_NONE: Flicking.DIRECTION_NONE,
  DIRECTION_LEFT: Flicking.DIRECTION_LEFT,
  DIRECTION_RIGHT: Flicking.DIRECTION_RIGHT,
  DIRECTION_UP: Flicking.DIRECTION_UP,
  DIRECTION_DOWN: Flicking.DIRECTION_DOWN,
  DIRECTION_HORIZONTAL: Flicking.DIRECTION_HORIZONTAL,
  DIRECTION_VERTICAL: Flicking.DIRECTION_VERTICAL,
  DIRECTION_ALL: Flicking.DIRECTION_ALL
});
/**
 * Base class to generate flicking plugin
 * Lifecycle: componentWillMount --> componentMount --> componentDidMount --> componentWillUnmount
 * @ko Flicking 플러그인을 생성하기 위한 기본 클래스
 * @alias eg.Flicking.plugin
 * @private
 */

var Plugin =
/*#__PURE__*/
function () {
  var Plugin =
  /*#__PURE__*/
  function () {