---
title: "Breaking: #77783 - Removed unused ExtJS JavaScript libraries"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-77783"
source: "Changelog/8.4/Breaking-77783-RemoveUnusedExtJSLibraries.rst"
typo3-version: "8.4"
typo3-major: 8
type: "breaking"
issue: 77783
forge: "https://forge.typo3.org/issues/77783"
tags: ["Backend", "JavaScript"]
rendered: "2026-09-23T19:53:57+00:00"
---

# Breaking: #77783 - Removed unused ExtJS JavaScript libraries {#breaking-77783}

See [forge#77783](https://forge.typo3.org/issues/77783)

## Description {#description}

The ExtJS libraries `app.SearchField`, `grid.RowExpander`, `ux.FitToParent` have been removed from the TYPO3 core
after all usages of them have been removed from the TYPO3 core with Feature #74359.

## Impact {#impact}

Including or calling any of the named JavaScript libraries will result in an error.

## Affected Installations {#affected-installations}

Any TYPO3 installations using custom extensions based on ExtJS which rely on the named libraries.

## Migration {#migration}

There is no migration available, consider migrating to a supported modern framework.