ext_localconf.php

<?php
if (!defined("TYPO3_MODE")) {
    die ("Access denied.");
}

/**
 * Register hooks in TCEmain:
 */
// this hook is used to prevent saving of news or category records which have categories assigned that are not allowed for the current BE user.
// The list of allowed categories can be set with 'tt_news_cat.allowedItems' in user/group TSconfig.
// This check will be disabled until 'options.useListOfAllowedItems' (user/group TSconfig) is set to a value.
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['processDatamapClass']['tt_news'] =
    \RG\TtNews\Hooks\DataHandlerHook::class;

// this hook is used to prevent saving of a news record that has non-allowed categories assigned when a command is executed (modify,copy,move,delete...).
// it checks if the record has an editlock. If true, nothing will not be saved.
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['processCmdmapClass']['tt_news'] =
    \RG\TtNews\Hooks\DataHandlerHook::class;

$confArr = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf']['tt_news']);
TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTypoScriptSetup('
  plugin.tt_news = USER
  plugin.tt_news {
    userFunc = ' . \RG\TtNews\Plugin\TtNews::class . '->main_news

    # validate some configuration values and display a message if errors have been found
    enableConfigValidation = 1
  }
');

// add default rendering for pi_layout plugin
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTypoScript(
    'tt_news',
    'setup',
    'tt_content.list.20.9 =< plugin.tt_news',
    'defaultContentRendering'
);
if (TYPO3_MODE === 'BE') {
    // Apply PageTSconfig
    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPageTSConfig(
        '<INCLUDE_TYPOSCRIPT: source="FILE:EXT:tt_news/Configuration/PageTS/PageTs.ts">'
    );

// Page module hook
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/class.tx_cms_layout.php']['list_type_Info']['9']['tt_news'] = \RG\TtNews\Hooks\PageModuleHook::class . '->getExtensionSummary';
}


if (!is_array($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['tt_news_cache'])) {
    $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['tt_news_cache'] = array(
        'backend' => TYPO3\CMS\Core\Cache\Backend\Typo3DatabaseBackend::class,
        'frontend' => TYPO3\CMS\Core\Cache\Frontend\VariableFrontend::class
    );
}

$GLOBALS['TYPO3_CONF_VARS']['FE']['eID_include']['tt_news_catmenu'] = RG\TtNews\Controller\NewsFrontendAjaxController::class . '::dispatch';


// register news cache table for "clear all caches"
$GLOBALS ['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['clearAllCache_additionalTables']['tt_news_cache'] = 'tt_news_cache';


// in order to make "direct Preview links" for tt_news work again in TYPO3 >= 6, unset pageNotFoundOnCHashError if a BE_USER is logged in
$configuredCookieName = trim($GLOBALS['TYPO3_CONF_VARS']['BE']['cookieName']);
if (empty($configuredCookieName)) {
    $configuredCookieName = 'be_typo_user';
}
if ($_COOKIE[$configuredCookieName]) {
    $GLOBALS['TYPO3_CONF_VARS']['FE']['pageNotFoundOnCHashError'] = 0;
}

$GLOBALS['TYPO3_CONF_VARS']['SYS']['formEngine']['formDataGroup']['tcaDatabaseRecord'][\RG\TtNews\Form\FormDataProvider::class] = array(
	'depends' => array(
		\TYPO3\CMS\Backend\Form\FormDataProvider\DatabaseRowInitializeNew::class,
	)
);