Deprecation: #94227 - f:base ViewHelper

See Issue #94227

Description

The <f:base> ViewHelper isn’t suitable in almost all use cases and has been deprecated: In most cases the PageRenderer takes care of the main <head> markup, directly, or indirectly via TypoScript config.baseURL.

Impact

Using the ViewHelper in Fluid templates will log a deprecation warning and the ViewHelper will be dropped with v12.

Affected Installations

The limited use of the ViewHelper likely leads to little usage numbers. Searching extensions for the string html:<f:base> should reveal any usages.

Migration

The easiest solution is to simply copy PHP class TYPO3\CMS\Fluid\ViewHelpers\BaseViewHelper to the consuming extension, giving the ViewHelper a happy life in an extension specific namespace.