Deprecation: #108524 - Fluid namespaces in TYPO3_CONF_VARS 

Description 

Registering global namespaces for Fluid templates in TYPO3_CONF_VARS has been deprecated.

Impact 

Defined namespaces in $GLOBALS['TYPO3_CONF_VARS']['SYS']['fluid']['namespaces'] will no longer be registered in TYPO3 v15.

Affected installations 

Installations and extensions that use $GLOBALS['TYPO3_CONF_VARS']['SYS']['fluid']['namespaces'] to define additional global namespaces or extend existing global namespaces.

Migration 

Standard use cases, such as registering a new global namespace or extending an existing one, can be migrated to the dedicated Configuration/Fluid/Namespaces.php configuration file.

Before:

$GLOBALS['TYPO3_CONF_VARS']['SYS']['fluid']['namespaces']['myext'][] = 'MyVendor\\MyExtension\\ViewHelpers';

After:

<?php

return [
    'myext' => ['MyVendor\\MyExtension\\ViewHelpers'],
];

See Feature: #108524 - Configuration file to register global Fluid namespaces for more details and examples.