Create.php

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<?php
namespace Magento\Checkout\Controller\Account;

use Magento\Framework\Controller\ResultFactory;
use Magento\Framework\Exception\AlreadyExistsException;
use Magento\Framework\Exception\NoSuchEntityException;

class Create extends \Magento\Framework\App\Action\Action
{
    protected $checkoutSession;

    protected $customerSession;

    protected $orderCustomerService;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Sales\Api\OrderCustomerManagementInterface $orderCustomerService
    ) {
        $this->checkoutSession = $checkoutSession;
        $this->customerSession = $customerSession;
        $this->orderCustomerService = $orderCustomerService;
        parent::__construct($context);
    }

    public function execute()
    {
        $resultJson = $this->resultFactory->create(ResultFactory::TYPE_JSON);

        if ($this->customerSession->isLoggedIn()) {
            return $resultJson->setData(
                [
                    'errors' => true,
                    'message' => __('Customer is already registered')
                ]
            );
        }
        $orderId = $this->checkoutSession->getLastOrderId();
        if (!$orderId) {
            return $resultJson->setData(
                [
                    'errors' => true,
                    'message' => __('Your session has expired')
                ]
            );
        }
        try {
            $this->orderCustomerService->create($orderId);
            return $resultJson->setData(
                [
                    'errors' => false,
                    'message' => __('A letter with further instructions will be sent to your email.')
                ]
            );
        } catch (\Exception $e) {
            $this->messageManager->addExceptionMessage($e, $e->getMessage());
            throw $e;
        }
    }
}