Fixes:
Manager.php:
public function createInstance($plugin_id, array $configuration = [], FieldStorageDefinitionInterface $field_storage = NULL) {
should become:
public function createInstance($plugin_id, array $configuration = [], FieldStorageDefinitionInterface|null $field_storage = NULL) {
Base.php
public function __construct(array $configuration, $plugin_id, $plugin_definition, FieldStorageConfigInterface $field_storage, FieldPermissionsServiceInterface $field_permissions_service = NULL) {
should become:
public function __construct(array $configuration, $plugin_id, $plugin_definition, FieldStorageConfigInterface $field_storage, FieldPermissionsServiceInterface|null $field_permissions_service = NULL) {
and
public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, FieldStorageConfigInterface $field_storage = NULL) {
should become
public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, FieldStorageConfigInterface|null $field_storage = NULL) {
Active
2.0
Code
This was reported (and fixed) earlier in 📌 Nullable types must be explicit Active
I'll close this issue as a duplicate