ext_localconf.php

<?php

if (!defined('TYPO3_MODE') && !defined('TYPO3')) {
    die ('Access denied.');
}

// register own renderType
$GLOBALS['TYPO3_CONF_VARS']['SYS']['formEngine']['nodeRegistry'][1552428667] = [
    'nodeName' => 'animationPreview',
    'priority' => '40',
    'class' => \Baschte\ContentAnimations\Form\Elements\AnimationPreviewField::class
];

// register own typoscript FILECONTENT cObject (can be removed once v11 suppot is dropped)
if(!isset($GLOBALS['TYPO3_CONF_VARS']['FE']['ContentObjects']['FILECONTENT'])) {
	$GLOBALS['TYPO3_CONF_VARS']['FE']['ContentObjects'] = array_merge(
		$GLOBALS['TYPO3_CONF_VARS']['FE']['ContentObjects'] ?? [],
		['FILECONTENT' => \Baschte\ContentAnimations\ContentObject\FileContentContentObject::class]
	);
}

// get extensionConfiguration for 'content_animations'
$extensionManagementUtility = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Configuration\ExtensionConfiguration::class);
$extensionConfiguration = $extensionManagementUtility->get('content_animations');

// register footer preview to tt_content_drawFooter hook if this feature is active
if (empty($extensionConfiguration['hideFooterAnimationLabel']) || !$extensionConfiguration['hideFooterAnimationLabel']) {
    TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPageTSConfig('templates.typo3/cms-backend.partialsRootPaths = baschte/content-animations:Resources/Private/TemplateOverrides/typo3/cms-backend');
}