typo3-v13-to-v14-upgrade

name	typo3-v13-to-v14-upgrade
description	Use when upgrading TYPO3 13 to TYPO3 14, checking extension compatibility, Composer blockers, Rector/Fractor migrations, deprecations, or planning a major-version migration. Covers analysis, planning, and execution of TYPO3 13 to 14 upgrades in Composer-based projects.

TYPO3 v13 to v14 Upgrade

Use this skill to analyze, plan, and execute a TYPO3 13 to TYPO3 14 upgrade in Composer-based projects. Treat the upgrade as a staged engineering change: first remove uncertainty, then plan the migration, then execute in small reversible steps.

Required Start

1. Read the repository's AGENTS.md and follow it. If it requires SequentialThinking, memory reads, DDEV, Playwright, Rector, or Fractor, apply those rules before touching files.
2. Create or confirm a dedicated branch before making upgrade edits. Do not run destructive Git commands.
3. Confirm the project is not production. TYPO3 major upgrades should run locally, in DDEV, or on a parallel copy with database and file backups.
4. Fetch current documentation before planning version-specific changes:
   • Resolve and query TYPO3 documentation via Context7 when available.
   • Prefer official TYPO3 docs for v14 upgrade notes, pre-upgrade tasks, system requirements, changelogs, and extension scanner guidance.
   • Verify Rector and Fractor commands against the project's installed packages and config.

Operating Modes

• analyze: Inventory the project, installed extensions, constraints, deprecations, and blockers. Do not change code except for explicitly requested reports.
• plan: Produce a detailed migration plan with ordered phases, commands, risks, rollback points, and acceptance criteria.
• execute: Perform the upgrade incrementally. Keep changes focused, run dry-runs before applying automated refactors, and verify after every phase.

If the user does not specify a mode, start with analyze, then ask before executing Composer or code changes unless the user already requested implementation.

Analysis Workflow

1. Project Baseline

Collect the current state using DDEV-first commands when the project uses DDEV:

ddev describe
ddev composer show typo3/cms-core
ddev composer show --direct
ddev composer show -t
ddev composer outdated --direct
ddev php -v
ddev typo3 --version

Also inspect these files when present:

• composer.json, composer.lock, rector.php, fractor.php, .ddev/config.yaml
• config/system/settings.php, config/sites/*/config.yaml
• packages/*/ext_emconf.php, packages/*/composer.json, packages/*/Configuration/**
• packages/*/Resources/Private/**/*.html, *.typoscript, *.tsconfig, *.yaml, *.xml, *.xlf
• public/typo3conf/ext/* only for non-Composer or legacy extension layouts

2. Extension Inventory

Build a table of installed extensions and classify each one:

Extension	Package	Type	Current version	TYPO3 14 compatible?	Evidence	Action
customer_sitepackage	packages/customer_sitepackage	custom	local	unknown	local analysis	migrate

Use these checks:

ddev composer why-not typo3/cms-core ^14.3
ddev composer prohibits typo3/cms-core ^14.3
ddev composer why-not typo3/cms-backend ^14.3

For each direct extension, inspect Packagist/TER/vendor docs as needed. Do not assume compatibility from package names. For local extensions, inspect composer constraints, ext_emconf.php, service configuration, event listeners, TCA, TypoScript, Fluid, XLF, and custom PHP APIs.

Classify actions as:

• ready: supports target TYPO3 14 version with no known changes.
• update: compatible version exists; update before or during core upgrade.
• migrate: local extension or sitepackage requires code/config changes.
• replace: extension is unmaintained or blocks v14.
• remove: extension is unused or no longer needed.
• blocked: no compatible version or unresolved Composer conflict.

3. Deprecation And Breaking-Change Scan

Run non-destructive scans first:

ddev typo3 referenceindex:update
ddev typo3 cache:flush
ddev exec vendor/bin/rector process --dry-run
ddev php vendor/bin/fractor process --dry-run

If TYPO3's extension scanner is available, run it from the backend Upgrade module or via an installed CLI scanner. Capture findings and map each issue to a changelog entry when possible.

Review TYPO3 v14 changelogs for these categories:

• Breaking Changes
• Important
• Deprecation removals from v13
• System extension additions, removals, and behavior changes
• Upgrade Wizards, including scheduler/task migrations when typo3/cms-scheduler is installed

4. Code And Configuration Hotspots

Pay special attention to:

• ext_localconf.php, ext_tables.php, event listeners, middleware, DI services, hooks, signals, and PSR-14 events
• TCA definitions and FormEngine customizations
• TypoScript setup/constants, Page TSconfig, site sets, routing, and language config
• Fluid ViewHelpers, templates, layouts, partials, content blocks, and Form YAML
• Scheduler tasks, CLI commands, backend modules, workspaces, redirects, SEO, indexed search, and form integrations
• Third-party extensions with custom database schema or upgrade wizards
• Accessibility and bilingual/RTL behavior after template or frontend changes

Pre-Upgrade Preparation

Produce and execute a checklist before changing Composer constraints:

1. Backups:
   • Export database.
   • Preserve uploaded files and generated assets if needed.
   • Save current composer.json and composer.lock state through Git.
2. Current v13 health:
   • Update to the latest TYPO3 13.4 patch release first.
   • Run all pending v13 upgrade wizards.
   • Update reference index.
   • Flush and warm caches.
   • Fix existing test failures before upgrading.
3. Dependency readiness:
   • Update direct extensions to the latest versions compatible with v13.
   • Resolve Composer blockers shown by why-not and prohibits.
   • Decide replace/remove strategy for incompatible extensions.
4. Automated refactors:
   • Run Rector dry-run and review output.
   • Run Fractor dry-run for Fluid, TypoScript, XML, and YAML changes.
   • Apply automated changes only after reviewing the dry-run scope.
5. Documentation:
   • Record known risks, blocked extensions, target TYPO3 version, target PHP version, and rollback plan.

Migration Plan Output

When asked for a plan, use this structure:

# TYPO3 13 to 14 Migration Plan

## Executive Summary
- Current TYPO3/PHP versions:
- Target TYPO3/PHP versions:
- Upgrade readiness:
- Primary blockers:
- Recommended approach:

## Extension Compatibility Matrix
| Extension | Current | Target | Status | Evidence | Required action |

## Pre-Upgrade Checklist
- [ ] Backup database and files
- [ ] Update to latest v13.4 patch
- [ ] Run v13 upgrade wizards
- [ ] Update reference index
- [ ] Resolve Composer blockers
- [ ] Run Rector dry-run
- [ ] Run Fractor dry-run
- [ ] Confirm test baseline

## Step-by-Step Execution
1. Create branch and baseline evidence
2. Update PHP/DDEV if required while staying on TYPO3 13
3. Update extensions compatible with v13 and v14
4. Apply Rector and Fractor pre-upgrade changes
5. Change TYPO3 Composer constraints to target v14
6. Run Composer update with all dependencies
7. Run TYPO3 upgrade wizards
8. Apply post-upgrade Rector and Fractor changes
9. Fix extension and sitepackage issues
10. Run full verification
11. Prepare deployment and rollback notes

## Commands
Provide exact DDEV-first commands for this project.

## Risks And Rollback Points
List risk, impact, detection method, mitigation, rollback point.

## Verification Matrix
| Area | Command/manual check | Expected result |

Execution Protocol

Phase 1: Baseline And Branch

git status --short
git switch -c codex/typo3-v14-upgrade
ddev start
ddev composer install
ddev npm install

Only create the branch if the user has not already chosen one. If the worktree is dirty, identify unrelated changes and do not overwrite them.

Phase 2: Current v13 Stabilization

ddev composer update "typo3/*" --with-all-dependencies
ddev typo3 upgrade:run
# If the project uses a different command name, inspect `ddev typo3 list upgrade` first.
ddev typo3 referenceindex:update
ddev typo3 cache:flush
ddev typo3 cache:warmup
ddev exec vendor/bin/phpunit
ddev playwright test

Adapt command names to the installed TYPO3 console version. If an upgrade command is unavailable, use the backend Upgrade module and document manual steps.

Phase 3: Rector And Fractor Before Composer Upgrade

Run dry-runs, inspect the diff, then apply only relevant changes:

ddev exec vendor/bin/rector process --dry-run
ddev exec vendor/bin/rector process
ddev php vendor/bin/fractor process --dry-run
ddev php vendor/bin/fractor process

After changing Fluid, TypoScript, YAML, XML, XLF, or .htaccess, run Fractor dry-run again to confirm no remaining automated findings.

Phase 4: Composer Upgrade To TYPO3 14

Generate the exact Composer command from installed TYPO3 core packages. Prefer upgrading all installed TYPO3 core packages together:

ddev composer require --update-with-all-dependencies \
  "typo3/cms-core:^14.3" \
  "typo3/cms-backend:^14.3" \
  "typo3/cms-frontend:^14.3"

Do not blindly use this sample. Include every installed typo3/cms-* package from the project and remove packages that no longer exist in v14. Use composer why-not to resolve conflicts before forcing changes.

Phase 5: Post-Upgrade Wizards And Refactors

ddev composer dump-autoload
ddev typo3 cache:flush
ddev typo3 upgrade:list
ddev typo3 upgrade:run
ddev typo3 database:updateschema
ddev typo3 referenceindex:update
ddev exec vendor/bin/rector process --dry-run
ddev php vendor/bin/fractor process --dry-run

Run relevant upgrade wizards. For TYPO3 14, check official docs for current required wizards; scheduler task migration is one known area when typo3/cms-scheduler is installed.

Phase 6: Verification

Use the repository's completion gates. Typical checks:

ddev composer ci:composer:normalize
ddev exec vendor/bin/phpunit
ddev npm run build
ddev playwright test
ddev typo3 cache:flush
ddev typo3 cache:warmup

Manually verify:

• TYPO3 backend login and key modules
• Frontend pages in all configured languages
• Language switcher, hreflang, routes, and redirects
• Forms, scheduler tasks, CLI commands, and custom content blocks
• Accessibility: keyboard navigation, focus, labels, contrast, screen reader smoke checks
• RTL rendering for Urdu or other RTL site languages
• Error logs, deprecation logs, and browser console

Using Rector

Before using Rector, inspect rector.php and installed packages. Upgrade or add TYPO3 Rector sets only when compatible with the target. Use dry-run output to separate safe mechanical changes from changes needing human review.

Good practice:

• Commit or checkpoint before applying Rector.
• Run Rector on focused paths if the full run is too noisy.
• Review changes to public APIs, dependency injection, event listeners, and TCA carefully.
• Run PHPUnit and selected Playwright tests after applying Rector.

Using Fractor

Fractor is required after changes to Fluid, TypoScript, XML, YAML, XLF, and .htaccess when available in the project. Use it for automated modernization and formatting where rules exist.

Good practice:

• Run Fractor dry-run before and after major upgrade edits.
• Review template changes for accessibility and translation behavior.
• Verify TypoScript and site set changes in both frontend and backend.
• Keep Fractor changes separate from hand-written functional changes when possible.

Completion Report

When done, report:

• TYPO3/PHP versions before and after
• Composer packages changed
• Extension compatibility outcomes
• Rector and Fractor changes applied
• Upgrade wizards run
• Database/schema/reference-index actions
• Tests and manual checks performed
• Known residual risks or follow-up tasks
• Deployment and rollback instructions

If the upgrade is not fully completed, clearly separate completed work, blockers, and next executable steps.

Official Documentation To Check

Use current official documentation during each real upgrade because TYPO3 14 guidance and extension compatibility can change:

• TYPO3 14 major upgrade notes: https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Administration/Upgrade/Major/Version14.html
• TYPO3 pre-upgrade tasks: https://docs.typo3.org/m/typo3/reference-coreapi/14.3/en-us/Administration/Upgrade/Major/PreupgradeTasks/Index.html
• TYPO3 Composer major upgrade workflow: https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Administration/Upgrade/Major/UpgradeCore.html
• TYPO3 Composer migration and version constraints: https://docs.typo3.org/m/typo3/reference-coreapi/14.3/en-us/Administration/Upgrade/MigrateToComposer/MigrationSteps.html

Load References As Needed

• Rector and Fractor command reference: references/command-reference.md
• Upgrade plan template and documentation links: references/plan-template.md