Feature: #101818 - BeforeLoadedPageTsConfigEvent

Description

The PSR-14 event \TYPO3\CMS\Core\TypoScript\IncludeTree\Event\BeforeLoadedPageTsConfigEvent can be used to add global static page TSconfig before anything else is loaded. This is especially useful, if page TSconfig is generated automatically as a string from a PHP function.

It is important to understand that this config is considered static and thus should not depend on runtime / request.

<?php

namespace Vendor\MyExtension\EventListener;

use TYPO3\CMS\Core\Attribute\AsEventListener;
use TYPO3\CMS\Core\TypoScript\IncludeTree\Event\BeforeLoadedPageTsConfigEvent;

#[AsEventListener(identifier: 'vendor/my-extension/global-pagetsconfig')]
final class AddGlobalPageTsConfig
{
    public function __invoke(BeforeLoadedPageTsConfigEvent $event): void
    {
        $event->addTsConfig('global = a global setting');
    }
}

Impact

Developers are able to define an event listener which is dispatched before any other page TSconfig is loaded.