Feature: #107569 - PSR-14 event before renderable is rendered 

Description 

A new PSR-14 event BeforeRenderableIsRenderedEvent has been introduced. It serves as a replacement for the now removed hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/form']['beforeRendering'] .

The new event is dispatched right before a renderable is rendered.

The event provides the following public properties:

• $renderable: The form element.
• $formRuntime: The form runtime.

Example 

An example event listener could look like this:

use TYPO3\CMS\Core\Attribute\AsEventListener;
use TYPO3\CMS\Form\Event\BeforeRenderableIsRenderedEvent;

final class BeforeRenderableIsRenderedEventListener
{
    #[AsEventListener('my-extension/before-renderable-is-rendered')]
    public function __invoke(BeforeRenderableIsRenderedEvent $event): void
    {
        $renderable = $event->renderable;
        if ($renderable->getType() !== 'Date') {
            return;
        }

        $date = $event->formRuntime[$renderable->getIdentifier()];
        if ($date instanceof \DateTime) {
            $event->formRuntime[$renderable->getIdentifier()] =
                $date->format('Y-m-d');
        }
    }
}

Impact 

With the new BeforeRenderableIsRenderedEvent , it is now possible to modify a renderable before it is rendered or adjust the form runtime data before rendering.