Custom field formatter fails in create()

Question

PHPStorm, PHP 7.4 IDE highlights $container->get('date.formatter'), with

"Expected parameter of type '\Drupal\Core\Datetime\DateFormatterInterface', 'object' provided"

This function is an exact copy of the core TimestampFormatter (which also shows the error)

/**
 * {@inheritdoc}
 */
public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
  return new static(
    $plugin_id,
    $plugin_definition,
    $configuration['field_definition'],
    $configuration['settings'],
    $configuration['label'],
    $configuration['view_mode'],
    $configuration['third_party_settings'],
    $container->get('date.formatter'),
    $container->get('entity_type.manager')->getStorage('date_format')
  );
}

The __construct is looking for a DateFormatterInterface (see below) and not sure how this works in core, but my "viewElements" is never firing since this error started.

public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, $label, $view_mode, array $third_party_settings, **DateFormatterInterface $date_formatter**, EntityStorageInterface $date_format_storage) {

What is the proper container->get to use to return a proper date.formatter and not an object which causes the create to fail without any errors logged that I can see?

Answer 1

Your code is fine, but you can remove the warnings by installing the PHPStorm Symfony plugin.

It teaches the IDE how to resolve the correct class from the service name you provide to $container->get().