ext_localconf.php

<?php

defined('TYPO3') || die('Access denied.');

(static function () {
    if (
        !isset($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations'][\Typo3Contentblocks\ContentblocksRegApi\Constants::CACHE]) ||
        !is_array($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations'][\Typo3Contentblocks\ContentblocksRegApi\Constants::CACHE])
    ) {
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']
        [\Typo3Contentblocks\ContentblocksRegApi\Constants::CACHE] = [
            'groups' => ['system'],
            'frontend' => \TYPO3\CMS\Core\Cache\Frontend\VariableFrontend::class
        ];
    }

    // Icons
    $iconRegistry = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Imaging\IconRegistry::class);
    $iconRegistry->registerIcon(
        'ext-contentblocks_reg_api',
        \TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider::class,
        ['source' => 'EXT:contentblocks_reg_api/Resources/Public/Icons/Extension.svg']
    );

    // TypoScript
    // TODO: find a better way to add individual definitions
    $importTypoScriptTemplate = (string)\TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Configuration\ExtensionConfiguration::class)
            ->get('contentblocks_reg_api', 'contentBlockDefinition');
    if ( strlen($importTypoScriptTemplate) > 2)
    {
        \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTypoScriptSetup(
            "@import '$importTypoScriptTemplate'"
        );
    }
    else {
        \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTypoScriptSetup(
            "@import 'EXT:contentblocks_reg_api/Configuration/TypoScript/setup.typoscript'"
        );
    }

    // Register content blocks
    $contentBlocks = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
        Typo3Contentblocks\ContentblocksRegApi\Service\ConfigurationService::class
    )->configuration();
    foreach ($contentBlocks as $contentBlock) {
        \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPageTSConfig(
            TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
                \Typo3Contentblocks\ContentblocksRegApi\Generator\PageTsConfigGenerator::class
            )->pageTsConfigForContentBlock($contentBlock)
        );

        $iconRegistry->registerIcon(
            $contentBlock['CType'],
            $contentBlock['iconProviderClass'],
            ['source' => $contentBlock['icon']]
        );

        \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTypoScriptSetup(
            TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
                \Typo3Contentblocks\ContentblocksRegApi\Generator\TypoScriptGenerator::class
            )->typoScriptForContentBlock($contentBlock)
        );
    }

    // Module TypoScript
    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTypoScriptSetup(
        "@import 'EXT:contentblocks_reg_api/Configuration/TypoScript/module/setup.typoscript'"
    );
})();

// Add Upgrade Wizard
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/install']['update']['contentblocksRegApi_flexformToDbColumnsUpdate'] = \Typo3Contentblocks\ContentblocksRegApi\Updates\FlexformToDbColumnsUpdate::class;