di.xml
<type name="Magento\Quote\Model\Cart\CartTotalRepository">
<plugin name="Amasty_Rules::cart_total_repository_get" type="Maijindou\Rules\Plugin\Cart\CartTotalRepository" />
</type>
/**
* @param \Magento\Quote\Model\Cart\CartTotalRepository $subject
* @param \Magento\Quote\Model\Cart\Totals $quoteTotals
*
* @return \Magento\Quote\Model\Cart\Totals
*/
public function afterGet(\Magento\Quote\Model\Cart\CartTotalRepository $subject, $quoteTotals)
{
return $quoteTotals;
}