ext_localconf.php

<?php

defined('TYPO3') || die();

(function () {
    $confArray = \Clickstorm\CsSeo\Utility\ConfigurationUtility::getEmConfiguration();

    // Hook into the page module
    if (!isset($confArray['inPageModule']) || $confArray['inPageModule'] < 2) {
        $hook = ($confArray['inPageModule'] == 1) ? 'drawFooterHook' : 'drawHeaderHook';

        $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/db_layout.php'][$hook]['cs_seo'] =
            \Clickstorm\CsSeo\Hook\PageHook::class . '->render';
    }

    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tce']['formevals']['Clickstorm\\CsSeo\\Evaluation\\TCA\\RobotsDisallowAllEvaluator'] = '';
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tce']['formevals']['Clickstorm\\CsSeo\\Evaluation\\TCA\\RobotsExistsEvaluator'] = '';

    // new field types
    $GLOBALS['TYPO3_CONF_VARS']['SYS']['formEngine']['nodeRegistry'][1524490067] = [
        'nodeName' => 'snippetPreview',
        'priority' => 30,
        'class' => \Clickstorm\CsSeo\Form\Element\SnippetPreview::class,
    ];

    $GLOBALS['TYPO3_CONF_VARS']['SYS']['formEngine']['nodeRegistry'][1620117622] = [
        'nodeName' => 'txCsseoJsonLd',
        'priority' => 30,
        'class' => \Clickstorm\CsSeo\Form\Element\JsonLdElement::class,
    ];

    // Register the class to be available in 'eval' of TCA
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tce']['formevals']['Clickstorm\\CsSeo\\Evaluation\\TCA\\JsonLdEvaluator'] = '';

    // add hook to get current cHash params
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_content.php']['getData']['cs_seo'] =
        \Clickstorm\CsSeo\Hook\CurrentUrlGetDataHook::class;

    // generate and overwrite header data
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['TYPO3\CMS\Frontend\Page\PageGenerator']['generateMetaTags'][] =
        \Clickstorm\CsSeo\Hook\MetaTagGeneratorHook::class . '->generate';

    // Add module configuration
    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTypoScriptSetup(trim('
        config.pageTitleProviders {
            csSeo {
                provider = Clickstorm\CsSeo\PageTitle\CsSeoPageTitleProvider
                before = seo
            }
        }
    '));
})();