public EntityDisplayInterface::getRenderer($field_name)
Gets the renderer plugin for a field (e.g. widget, formatter).
string $field_name: The field name.
\Drupal\Core\Field\PluginSettingsInterface|null A widget or formatter plugin or NULL if the field does not exist.
public function getRenderer($field_name);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Display!EntityDisplayInterface.php/function/EntityDisplayInterface::getRenderer/8.1.x