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Symfony processes all the application translation files as part of the process that compiles the application code before executing it. If there's an error in any translation file, you'll see an error message explaining the problem.
If you prefer, you can also validate the contents of any YAML and XLIFF
translation file using the
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# lint a single file $ php bin/console lint:yaml translations/messages.en.yaml $ php bin/console lint:xliff translations/messages.en.xlf # lint a whole directory $ php bin/console lint:yaml translations $ php bin/console lint:xliff translations
The linter results can be exported to JSON using the
$ php bin/console lint:yaml translations/ --format=json $ php bin/console lint:xliff translations/ --format=json