TotalsProcessor.php

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<?php
namespace Magento\Checkout\Block\Checkout;

use Magento\Checkout\Model\Layout\AbstractTotalsProcessor;

class TotalsProcessor extends AbstractTotalsProcessor implements LayoutProcessorInterface
{
    public function process($jsLayout)
    {
        $totals = $jsLayout['components']['checkout']['children']['sidebar']['children']['summary']
        ['children']['totals']['children'];
        $jsLayout['components']['checkout']['children']['sidebar']['children']['summary']
        ['children']['totals']['children'] = $this->sortTotals($totals);
        return $jsLayout;
    }
}