---
title: "Changelog 5.x"
manual: "Fluid Explained"
version: "main"
permalink: "https://docs.typo3.org/permalink/fluid:changelog-5-x"
source: "Changelog/5.x.rst"
rendered: "2026-10-08T14:12:40+00:00"
---

# Changelog 5.x {#changelog-5-x}

This Changelog lists notable deprecation and breaking changes. The full list of changes is available
[in the Fluid releases on GitHub](https://github.com/TYPO3/Fluid/releases).

## 5.0 {#5-0}

-   Breaking: Property `TYPO3FluidFluidCoreViewHelperAbstractViewHelper::$childNodes`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperAbstractViewHelper::setChildNodes()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperViewHelperInterface::setChildNodes()`
    has been removed.
-   Breaking: ViewHelper namespaces are no longer inherited from templates to layouts and partials.
-   Breaking: Trait `TYPO3FluidFluidCoreViewHelperTraitsCompileWithRenderStatic`
    has been removed.
-   Breaking: Trait `TYPO3FluidFluidCoreViewHelperTraitsCompileWithContentArgumentAndRenderStatic`
    has been removed.
-   Breaking: Static method `renderStatic()` on ViewHelpers that don't use `TYPO3FluidFluidCoreViewHelperTraitsCompileWithRenderStatic`
    or `TYPO3FluidFluidCoreViewHelperTraitsCompileWithContentArgumentAndRenderStatic`
    is no longer called.
-   Breaking: Method `TYPO3FluidFluidViewTemplatePaths->__construct()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidViewTemplatePaths->fillFromConfigurationArray()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidViewTemplatePaths->fillDefaultsByPackageName()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidViewTemplatePaths->ensureAbsolutePaths()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidViewTemplatePaths->extractPathArrays()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidViewTemplatePaths->getPackagePath()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidViewTemplatePaths->toArray()`
    has been removed.
-   Breaking: Constant `TYPO3FluidFluidViewTemplatePaths::DEFAULT_TEMPLATES_DIRECTORY`
    has been removed.
-   Breaking: Constant `TYPO3FluidFluidViewTemplatePaths::DEFAULT_LAYOUTS_DIRECTORY`
    has been removed.
-   Breaking: Constant `TYPO3FluidFluidViewTemplatePaths::DEFAULT_PARTIALS_DIRECTORY`
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperViewHelperResolver::resolvePhpNamespaceFromFluidNamespace()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperViewHelperResolver::isNamespaceValidOrIgnored()`
    has been removed.
-   Breaking: Constant `TYPO3FluidFluidCoreParserPatterns::NAMESPACESUFFIX`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperViewHelperResolver::addNamespaces()`
-   Breaking: Setting a template's layout with the variable `layoutName` is no longer possible.
-   Breaking: Constant `TYPO3FluidFluidCoreCompilerTemplateCompiler::LAYOUT_VARIABLE`
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperAbstractViewHelper->overrideArgument()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperAbstractViewHelper::isValidType()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperAbstractViewHelper::getFirstElementOfNonEmpty()`
    has been removed.
-   Breaking: Method `postParseEvent()` on ViewHelpers is no longer called.
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperAbstractTagBasedViewHelper->registerUniversalTagAttributes()`
    has been removed.
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperAbstractTagBasedViewHelper->registerTagAttribute()`
    has been removed.
-   Breaking: Using the `xmlns` namespace syntax with a PHP namespace instead of an url is no longer possible.
-   Breaking: ViewHelper argument validation now uses the `StrictArgumentProcessor`, which might lead to
    slightly different behavior within ViewHelpers or exceptions if ViewHelpers didn't validate arguments properly before.
-   -   **Breaking: Classes, interfaces, methods and constants related to cache warmup have been removed:**

        -   `TYPO3FluidFluidCoreCacheFluidCacheInterface::getCacheWarmer()`
        -   `TYPO3FluidFluidCoreCacheSimpleFileCache::getCacheWarmer()`
        -   `TYPO3FluidFluidCoreCacheFluidCacheWarmerInterface`
        -   `TYPO3FluidFluidCoreCacheStandardCacheWarmer`
        -   `TYPO3FluidFluidCoreCacheFluidCacheWarmupResult`
        -   `TYPO3FluidFluidCoreCompilerFailedCompilingState`
        -   `TYPO3FluidFluidCoreCompilerTemplateCompiler::MODE_NORMAL`
        -   `TYPO3FluidFluidCoreCompilerTemplateCompiler::MODE_WARMUP`
        -   `TYPO3FluidFluidCoreCompilerTemplateCompiler::$mode`
        -   `TYPO3FluidFluidCoreCompilerTemplateCompiler::enterWarmupMode()`
        -   `TYPO3FluidFluidCoreCompilerTemplateCompiler::isWarmupMode()`
-   Breaking: The `<f:cache.warmup>` ViewHelper has been removed.
-   Breaking: `TYPO3FluidFluidCoreParserTemplateParser::parse()` and
    `TYPO3FluidFluidCoreParserTemplateParser::createParsingRelatedExceptionWithContext()` no longer
    allow `null` as template identifier.
-   Breaking: Tag attributes that are set to `null` are now removed from the tag instead of being
    interpreted as empty string in `TYPO3FluidFluidCoreViewHelperTagBuilder`.
-   Breaking: Method `TYPO3FluidFluidCoreViewHelperAbstractViewHelper::validateArguments()`
    has been removed.
-   Breaking: Custom implementations of the `validateArguments()` methods in ViewHelpers are no longer called.
-   Breaking: Fluid variable names can no longer start with an underscore character (`_`). Adding such a variable to a template
    results in an exception. Note that this doesn't affect array keys or object property names, only the name of the variable itself.
-   Deprecation: Class `TYPO3FluidFluidCoreViewHelperLenientArgumentProcessor`
    is no longer being used by Fluid v5 and will be removed with Fluid v6.
-   Breaking: CDATA sections are no longer removed from Fluid templates. Use `<f:comment>` instead
    if you want to comment out code in Fluid templates.