---
title: "Feature: #15 - TYPO3 v14 support"
manual: "Environment State Manager"
version: "main"
permalink: "https://docs.typo3.org/permalink/fgtclb/environment-state-manager:feature-15-typo3-v14-support@main"
source: "Changelog/2.0/Feature-Typo3V14Support.rst"
rendered: "2026-10-17T14:50:33+00:00"
---

# Feature: #15 - TYPO3 v14 support {#feature-15-typo3-v14-support}

## Description {#description}

The extension supports TYPO3 v14 next to TYPO3 v13. The TYPO3 core-version
specific implementations for TYPO3 v14 are shipped in the
`FGTCLBEnvironmentStateManagerCore14` namespace and selected
automatically through dependency injection, mirroring the existing TYPO3 v13
implementation.

TYPO3 v14 removed the `TypoScriptFrontendController` (class, the
`$GLOBALS['TSFE']` global and the `frontend.controller` request attribute).
It was the only TYPO3 core-version specific state this extension carried on the
`Core13ExtendedStateInterface`. TYPO3 v14 therefore has no extended state
interface: `Core14State` implements the version-agnostic
`StateInterface` directly.

The frontend environment builder reproduces on TYPO3 v14 what the
`TypoScriptFrontendController` bootstrap did on TYPO3 v13:

-   the PageRenderer language is initialized as the
    `PrepareTypoScriptFrontendRendering` middleware does,
-   the `ContentObjectRenderer` is created and started without the removed
    `TypoScriptFrontendController` constructor argument, as the frontend
    request handler does.

TYPO3 v14 added `ApplicationType::INSTALL`. The
`EnvironmentBuilderFactory` builds frontend and backend environments only
and throws the new `UnsupportedApplicationType` exception for any other
application type.

## Impact {#impact}

The extension can be installed on TYPO3 v14. Code that needs the TYPO3 v13
`TypoScriptFrontendController` state must continue to narrow to
`Core13ExtendedStateInterface`, which is only available on TYPO3 v13, as
documented.