Onepage.php

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<?php
namespace Magento\Checkout\Block;

class Onepage extends \Magento\Framework\View\Element\Template
{
    protected $formKey;

    protected $_isScopePrivate = false;

    protected $jsLayout;

    protected $configProvider;

    protected $layoutProcessors;

    private $serializer;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\Data\Form\FormKey $formKey,
        \Magento\Checkout\Model\CompositeConfigProvider $configProvider,
        array $layoutProcessors = [],
        array $data = [],
        \Magento\Framework\Serialize\Serializer\Json $serializer = null
    ) {
        parent::__construct($context, $data);
        $this->formKey = $formKey;
        $this->_isScopePrivate = true;
        $this->jsLayout = isset($data['jsLayout']) && is_array($data['jsLayout']) ? $data['jsLayout'] : [];
        $this->configProvider = $configProvider;
        $this->layoutProcessors = $layoutProcessors;
        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
    }

    public function getJsLayout()
    {
        foreach ($this->layoutProcessors as $processor) {
            $this->jsLayout = $processor->process($this->jsLayout);
        }

        return json_encode($this->jsLayout, JSON_HEX_TAG);
    }

    public function getFormKey()
    {
        return $this->formKey->getFormKey();
    }

    public function getCheckoutConfig()
    {
        return $this->configProvider->getConfig();
    }

    public function getBaseUrl()
    {
        return $this->_storeManager->getStore()->getBaseUrl();
    }

    public function getSerializedCheckoutConfig()
    {
        return json_encode($this->getCheckoutConfig(), JSON_HEX_TAG);
    }
}