Logout.php

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<?php
namespace Magento\Customer\Controller\Ajax;

class Logout extends \Magento\Framework\App\Action\Action
{
    protected $session;

    protected $resultJsonFactory;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory
    ) {
        parent::__construct($context);
        $this->customerSession = $customerSession;
        $this->resultJsonFactory = $resultJsonFactory;
    }

    public function execute()
    {
        $lastCustomerId = $this->customerSession->getId();
        $this->customerSession->logout()
            ->setBeforeAuthUrl($this->_redirect->getRefererUrl())
            ->setLastCustomerId($lastCustomerId);

        $resultJson = $this->resultJsonFactory->create();
        return $resultJson->setData(['message' => 'Logout Successful']);
    }
}