TYPO3 Extension Upgrade Skill

# TYPO3 Extension Upgrade Skill A Claude Code skill for systematically upgrading TYPO3 extensions to newer LTS versions. **Developed by [Netresearch DTT GmbH](https://www.netresearch.de/)** ## Overview This skill guides extension developers through upgrading TYPO3 extensions (third-party or custom) to newer TYPO3 LTS versions with modern PHP compatibility. It covers: - **Extension Scanner** - Backend module for diagnosing deprecated/removed APIs - **Rector** - Automated PHP code migrations - **Fractor** - Automated non-PHP file migrations (FlexForms, TypoScript, YAML, Fluid) - **PHPStan** - Static analysis - **PHPUnit** - Testing framework setup ## Scope This skill is for **extension developers** upgrading extension code. It does NOT cover: - Upgrading TYPO3 project installations - TYPO3 core upgrades - Site/instance migrations ## Supported Upgrade Paths | From | To | Status | |------|-----|--------| | v7 | v8 | Documented | | v8 | v9 | Documented | | v9 | v10 | Documented | |