PoWriterInterface

class \Drupal\Component\Gettext\PoMemoryWriter implements \Drupal\Component\Gettext\PoWriterInterface
class \Drupal\Component\Gettext\PoStreamWriter implements \Drupal\Component\Gettext\PoWriterInterface, \Drupal\Component\Gettext\PoStreamInterface
class \Drupal\locale\PoDatabaseWriter implements \Drupal\Component\Gettext\PoWriterInterface

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