findExtension example

$this->listBundles($errorIo);
            $this->listNonBundleExtensions($errorIo);

            $errorIo->comment([
                'Provide the name of a bundle as the first argument of this command to dump its default configuration. (e.g. <comment>config:dump-reference FrameworkBundle</comment>)',
                'For dumping a specific option, add its path as the second argument of this command. (e.g. <comment>config:dump-reference FrameworkBundle http_client.default_options</comment> to dump the <comment>framework.http_client.default_options</comment> configuration)',
            ]);

            return 0;
        }

        $extension = $this->findExtension($name);

        if ($extension instanceof ConfigurationInterface) {
            $configuration = $extension;
        } else {
            $configuration = $extension->getConfiguration([], $this->getContainerBuilder($this->getApplication()->getKernel()));
        }

        $this->validateConfiguration($extension, $configuration);

        $format = $input->getOption('format');

        

if (null === $name = $input->getArgument('name')) {
            $this->listBundles($errorIo);
            $this->listNonBundleExtensions($errorIo);

            $errorIo->comment('Provide the name of a bundle as the first argument of this command to dump its configuration. (e.g. <comment>debug:config FrameworkBundle</comment>)');
            $errorIo->comment('For dumping a specific option, add its path as the second argument of this command. (e.g. <comment>debug:config FrameworkBundle serializer</comment> to dump the <comment>framework.serializer</comment> configuration)');

            return 0;
        }

        $extension = $this->findExtension($name);
        $extensionAlias = $extension->getAlias();
        $container = $this->compileContainer();

        $config = $this->getConfig($extension, $container, $input->getOption('resolve-env'));

        $format = $input->getOption('format');

        if (\in_array($format, ['txt', 'yml'], true) && !class_exists(Yaml::class)) {
            $errorIo->error('Setting the "format" option to "txt" or "yaml" requires the Symfony Yaml component. Try running "composer install symfony/yaml" or use "--format=json" instead.');

            return 1;
        }