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TYPO3 Updates
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Talk about TYPO3 updates at TYPO3 user group Rhine Ruhr 2024.
There are no slides, this is a collection of all the sources.

I'll go over the sources and show some parts hands on on real world project.

Update vs. Upgrade
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See: https://daniel-siepmann.de/typo3-update.html#updateVsUpgrade

* Prepare project setup ( https://daniel-siepmann.de/typo3-update.html#properSetup )

* Do the update ( https://daniel-siepmann.de/typo3-update.html#theUpdate )

Tooling
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* Rector

* Automated tests

* PHPStan

* Crawl frontend URLs and check TYPO3 log

* Compare frontend output

Ease updates for the future
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* Follow TYPO3 commits

* Follow TYPO3 blogs, e.g.

  * https://usetypo3.com/

  * https://brotkrueml.dev/what-you-can-do-today-to-ease-the-upgrade-to-typo3-v13/

  * https://www.sebkln.de/en/news/upgrade-typo3-v12/

  * https://daniel-siepmann.de/typo3-update.html#easeUpdatesInTheFuture

* https://packagist.org/packages/staabm/phpstan-todo-by

* Decouple from dependencies

  * Book https://leanpub.com/web-application-architecture/ from https://matthiasnoback.nl/

* Write automated tests (functional and end to end)

* Contribute back

  * Create issues

  * Share patches

Concrete example
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* Reuter v12

* https://github.com/werkraum-media/events

Sources
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Own sources

* https://daniel-siepmann.de/typo3-update.html

* https://daniel-siepmann.de/prepare-legacy-code-for-upcoming-typo3-versions.html

* https://daniel-siepmann.de/typo3-composer-best-practices.html

* https://daniel-siepmann.de/auto-migrate-php-code-via-configuration.html

* https://daniel-siepmann.de/posts/2017/using-php-codesniffer-for-automated-code-migrations.html prior rector

Official sources

* https://docs.typo3.org/c/typo3/cms-core/main/en-us/Index.html

* https://docs.typo3.org/Home/UpgradingTYPO3.html

Community sources

* https://packagist.org/packages/ichhabrecht/core-upgrader

  * https://github.com/IchHabRecht/core_upgrader/network

* https://packagist.org/packages/ssch/typo3-rector

* https://github.com/lolli42/dbdoctor

* https://github.com/peter-neumann-dev/ddev-cms-upgrader

* https://github.com/ElementareTeilchen/upgrader

* https://packagist.org/packages/saschaegerer/phpstan-typo3

* https://github.com/Tuurlijk/typo3scan

Additional sources

* https://packagist.org/packages/staabm/phpstan-todo-by