add declare strict_type

Author: edenduong

app/code/Magento/Bundle/Block/Adminhtml/Catalog/Product/Edit/Tab/Bundle/Option.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Bundle\Block\Adminhtml\Catalog\Product\Edit\Tab\Bundle;
 
 use Magento\Framework\Data\Form\Element\AbstractElement;

app/code/Magento/Bundle/Ui/DataProvider/Product/Form/Modifier/BundlePanel.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Bundle\Ui\DataProvider\Product\Form\Modifier;
 
 use Magento\Bundle\Model\Product\Attribute\Source\Shipment\Type as ShipmentType;

app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Options/Option.php

@@ -7,6 +7,8 @@
 /**
  * Customers defined options
  */
+declare(strict_types=1);
+
 namespace Magento\Catalog\Block\Adminhtml\Product\Edit\Tab\Options;
 
 use Magento\Backend\Block\Widget;