CheckoutTotalsJsLayoutDataProvider.php

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<?php
namespace Magento\Tax\CustomerData;

use Magento\Customer\CustomerData\JsLayoutDataProviderInterface;

class CheckoutTotalsJsLayoutDataProvider implements JsLayoutDataProviderInterface
{
    protected $taxConfig;

    public function __construct(
        \Magento\Tax\Model\Config $taxConfig
    ) {
        $this->taxConfig = $taxConfig;
    }

    public function getData()
    {
        return [
            'components' => [
                'minicart_content' => [
                    'children' => [
                        'subtotal.container' => [
                            'children' => [
                                'subtotal' => [
                                    'children' => [
                                        'subtotal.totals' => [
                                            'config' => $this->getTotalsConfig(),
                                        ],
                                    ],
                                ],
                            ],
                        ],
                    ],
                ],
            ],
        ];
    }

    protected function getTotalsConfig()
    {
        return [
            'display_cart_subtotal_incl_tax' => (int)$this->taxConfig->displayCartSubtotalInclTax(),
            'display_cart_subtotal_excl_tax' => (int)$this->taxConfig->displayCartSubtotalExclTax(),
        ];
    }
}