# the ``App\Util\UppercaseTransformer`` service will be
    # injected when an ``App\Util\TransformerInterface``
    # type-hint for a ``$shoutyTransformer`` argument is detected.
    App\Util\TransformerInterface $shoutyTransformer: '@App\Util\UppercaseTransformer'

    # If the argument used for injection does not match, but the
    # type-hint still matches, the ``App\Util\Rot13Transformer``
    # service will be injected.
    App\Util\TransformerInterface: '@App\Util\Rot13Transformer'

Doctrine\ORM\EntityManagerInterface $customerEntityManager: '@doctrine.orm.customer_entity_manager'

EntityManagerInterface $entityManager

EntityManagerInterface $customerEntityManager