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Migrating my first #TYPO3 Extension to version 12.4 LTS.
#PHPUnit is such a pleasure to use. It reveals all the deprecations not migrated by #rectorPHP which makes it easy to migrate code base.
That of course needs a good coverage by tests.
I find https://github.com/phpstan/phpstan-deprecation-rules very helpful for this, too (in addition to running the tests and using Rector).

Daniel Siepmann reshared this.

Didn't give it a try yet. But I guess it would be unable to report TCA migrations. But could be a great addition. Would also work with LSP integration within the editor.