/**
 * Implements hook_theme().
 */
function commerce_shipping_theme() {
  return [
    'commerce_shipment' => [
      'render element' => 'elements',
    ],
    'commerce_shipment_confirmation' => [
      'variables' => [
        'order_entity' => NULL,
        'shipment_entity' => NULL,
        'shipping_profile' => NULL,
        'tracking_code' => NULL,
      ],
    ],
  ];
}