DevelopmentSettingsPass.php

<?php

namespace Drupal\Core\DependencyInjection\Compiler;

use Drupal\Core\Cache\NullBackendFactory;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;

/**
 * Defines a compiler pass to register development settings.
 */
class DevelopmentSettingsPass implements CompilerPassInterface {
    
    /**
     * {@inheritdoc}
     */
    public function process(ContainerBuilder $container) : void {
        
        /** @var \Drupal\Core\KeyValueStore\KeyValueStoreInterface $development_settings */
        $development_settings = $container->get('keyvalue')
            ->get('development_settings');
        $twig_debug = $development_settings->get('twig_debug', FALSE);
        $twig_cache_disable = $development_settings->get('twig_cache_disable', FALSE);
        if ($twig_debug || $twig_cache_disable) {
            $twig_config = $container->getParameter('twig.config');
            $twig_config['debug'] = $twig_debug;
            $twig_config['cache'] = !$twig_cache_disable;
            $container->setParameter('twig.config', $twig_config);
        }
        if ($development_settings->get('disable_rendered_output_cache_bins', FALSE)) {
            $cache_bins = [
                'page',
                'dynamic_page_cache',
                'render',
            ];
            if (!$container->hasDefinition('cache.backend.null')) {
                $container->register('cache.backend.null', NullBackendFactory::class);
            }
            foreach ($cache_bins as $cache_bin) {
                if ($container->has("cache.{$cache_bin}")) {
                    $container->getDefinition("cache.{$cache_bin}")
                        ->clearTag('cache.bin')
                        ->addTag('cache.bin', [
                        'default_backend' => 'cache.backend.null',
                    ]);
                }
            }
        }
    }

}