typo3-extension-upgrade

name	typo3-extension-upgrade
description	Use when upgrading TYPO3 extensions to newer LTS versions (v11->v12, v12->v13, v13->v14 - v14.3 LTS is the current target), running Extension Scanner, Rector, Fractor, PHPStan, fixing deprecated APIs, or resolving compatibility issues. Also triggers on: migration, version upgrade, deprecated API, dual-version compatibility, Fluid 5 strict VHs, HashService removal, ext_tables.php split.

TYPO3 Extension Upgrade Skill

Framework for upgrading TYPO3 extensions to newer LTS versions. Extension code only, not project/core upgrades.

Upgrade Toolkit

Tool	Purpose	Files
Extension Scanner	Diagnose deprecated APIs	TYPO3 Backend
Rector	Automated PHP migrations	.php
Fractor	Non-PHP migrations	FlexForms, TypoScript, YAML, Fluid
PHPStan	Static analysis	.php

Core Workflow

1. Complete planning phase (consult references/pre-upgrade.md)
2. Create feature branch (verify git is clean)
3. Update composer.json constraints for target version
4. Audit third-party dependencies for major version changes (consult references/third-party-dependency-upgrades.md)
5. Run rector process --dry-run then review and apply
6. Run fractor process --dry-run then review and apply
7. Run php-cs-fixer fix
8. Run phpstan analyse against each supported dependency version and fix errors
9. Run phpunit and fix tests
10. Test in target TYPO3 version(s)
11. Verify success criteria (consult references/verification.md)

When NOT to Apply Automatically

Do NOT blindly apply Rector/Fractor when dual-version compatibility, missing tests, unclear changes, or complex APIs (DBAL, Extbase) are involved. Instead apply rules manually, testing between changes.

Third-Party Dependency Upgrades

When composer.json widens a dependency to a new major version: enumerate API usages, cross-reference the new API, verify mocks, use adapter pattern for signature differences, run PHPStan per major version. See references/third-party-dependency-upgrades.md.

Quick Commands

rector process --dry-run && rector process        # PHP migrations
fractor process --dry-run && fractor process       # Non-PHP migrations
php-cs-fixer fix && phpstan analyse && phpunit     # Quality checks

Asset Templates

Config templates in assets/: rector.php, fractor.php, phpstan.neon, phpunit.xml, .php-cs-fixer.php

References

Reference	Use when...
references/pre-upgrade.md	Planning checklist, version audit, risk assessment
references/api-changes.md	Checking deprecated/removed APIs by TYPO3 version
references/api-traps.md	Cross-version footguns: TCA restrictions, boot order, DI bypass
references/upgrade-v11-to-v12.md	Upgrading from TYPO3 v11 to v12
references/upgrade-v12-to-v13.md	Upgrading from TYPO3 v12 to v13
references/upgrade-v13-to-v14.md	Upgrading from TYPO3 v13 to v14
references/dual-compatibility.md	Dual compatibility (v12 + v13)
references/real-world-patterns.md	Real-world migration examples
references/toolchain-output.md	Rector/Fractor dry-run output
references/troubleshooting.md	Rector broke code, PHPStan errors, test failures
references/third-party-dependency-upgrades.md	Non-TYPO3 dependencies (major version bumps, adapter patterns)
references/verification.md	Success criteria and real-world testing
references/multi-version-worktrees.md	Per-LTS worktree layout, backport workflow, cross-version CI matrix
references/audit-mode.md	Assessing/estimating: ticket only non-automatable findings
scripts/scan-deprecations.sh <path>	Deterministic grep scan for deprecated/removed APIs and traps

External Resources

• TYPO3 Rector
• Fractor
• TYPO3 Core Changelog

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Credits & Attribution

This skill is based on the excellent work by Netresearch DTT GmbH.

Original repository: https://github.com/netresearch/typo3-extension-upgrade-skill

Copyright (c) Netresearch DTT GmbH — Methodology and best practices (MIT / CC-BY-SA-4.0)

Special thanks to Netresearch DTT GmbH for their generous open-source contributions to the TYPO3 community, which helped shape this skill collection. Adapted by webconsulting.at for this skill collection