Prevent-varnish-block-inline-render-plugin

<?php
declare(strict_types=1);

namespace [Namespace]\Core\Plugin;

use Magento\Framework\View\Layout;
use Magento\PageCache\Model\Config;

class LayoutPlugin
{
    /**
     * Application config object
     *
     * @var Config
     */
    protected $config;

    /**
     * Is varnish enabled flag
     *
     * @var bool
     */
    protected $isVarnishEnabled;

    /**
     * Is full page cache enabled flag
     *
     * @var bool
     */
    protected $isFullPageCacheEnabled;

    public function __construct(
        Config $config
    )
    {
        $this->config = $config;
    }

    /**
     * @param Layout $layout
     * @param callable $proceed
     * @param string $name
     */
    public function aroundRenderNonCachedElement(Layout $layout, callable $proceed, $name)
    {
        if (
            $this->isFullPageCacheEnabled()
            && $this->isVarnishEnabled()
            && $this->isVarnishBlock($layout, $name)
        ) {
            /** This block will be replaced with a <esi/> tag.
             * @see \Magento\PageCache\Observer\ProcessLayoutRenderElement::_wrapEsi
             *
             * It therefore does not need to be rendered inline, which normally happens
             * _before_ `core_layout_render_element` is dispatched in
             * @see \Magento\Framework\View\Layout::renderElement
             */
            return '';
        }
        return $proceed($name);
    }

    /**
     * @param Layout $layout
     * @param string $name
     * @return bool
     */
    protected function isVarnishBlock(Layout $layout, string $name): bool
    {
        return $layout->isBlock($name) && $layout->getBlock($name)->getTtl();
    }

    /**
     * Is full page cache enabled
     *
     * @return bool
     */
    private function isFullPageCacheEnabled()
    {
        if ($this->isFullPageCacheEnabled === null) {
            $this->isFullPageCacheEnabled = $this->config->isEnabled();
        }
        return $this->isFullPageCacheEnabled;
    }

    /**
     * Is varnish cache engine enabled
     *
     * @return bool
     */
    private function isVarnishEnabled()
    {
        if ($this->isVarnishEnabled === null) {
            $this->isVarnishEnabled = ($this->config->getType() == Config::VARNISH);
        }
        return $this->isVarnishEnabled;
    }
}