TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile(
    $_EXTKEY, 'Configuration/TypoScript', 'Project frontend'
);
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::registerPageTSConfigFile(
    'extname',
    'Configuration/PageTSConfig/index.ts',
    'Project backend'
);