Include yii\base\Event into SaleEvent

[Anubarak]

Description

Could you please include yii\base\Event or create a class craft\commerce\events\Events so using your new events won't throw an exception?
Currently the following Error is thrown

Error
Class 'craft\commerce\events\Event' not found

<?php
/**
 * @link https://craftcms.com/
 * @copyright Copyright (c) Pixel & Tonic, Inc.
 * @license https://craftcms.github.io/license/
 */
namespace craft\commerce\events;
/**
 * Class SaleEvent
 *
 * @author Pixel & Tonic, Inc. <support@pixelandtonic.com>
 * @since 2.2
 */
class SaleEvent extends Event // <----- Event not defined
{
    // Properties
    // ==========================================================================
    /**
     * @var Sale sale
     */
    public $sale;
    /**
     * @var bool Whether the sale is brand new
     */
    public $isNew = false;
}

Additional info

• Commerce version: 2.2.2