I lately updated a legacy Command to the new auto wire feature which needs the Translation Services.

After Updating the Command with:
public function __construct( TranslationWriterInterface $writer, TranslationReaderInterface $reader, ExtractorInterface $extractor ) { ...
I got the error: argument "$writer" of method "__construct()" references interface "Symfony\Component\Translation\Writer\TranslationWriterInterf
ace" but no such service exists. It cannot be auto-registered because it is from a different root namespace.

Maybe i did not read the documentation carefully or just wasnt aware of how the identification of the services is done, so only with the help of the support channel i got the hint that there are default alias for other services, but not here.

If there is no side-effect, its maybe better to just create the aliases in the core then having them defined in the own service.yml:

Symfony\Component\Translation\Extractor\ExtractorInterface: '@translation.extractor' Symfony\Component\Translation\Writer\TranslationWriterInterface: '@translation.writer' Symfony\Component\Translation\Reader\TranslationReaderInterface: '@translation.reader'