From c0cc1363491f9ffd24515ca150a484b9a594feb6 Mon Sep 17 00:00:00 2001
From: yoeriwalstra <yoeri@myparcel.com>
Date: Tue, 2 Jun 2026 10:55:00 +0200
Subject: [PATCH] :hankey: more implicitly nullable parameters

---
 src/Errors/AbstractCarrierError.php            | 2 +-
 src/Exceptions/AbstractException.php           | 2 +-
 src/Exceptions/AbstractMultiErrorException.php | 2 +-
 src/Transformers/AbstractTransformer.php       | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/Errors/AbstractCarrierError.php b/src/Errors/AbstractCarrierError.php
index 11c5272..f5300fd 100644
--- a/src/Errors/AbstractCarrierError.php
+++ b/src/Errors/AbstractCarrierError.php
@@ -23,7 +23,7 @@ public function __construct(
         protected string $errorCode,
         protected string $title,
         protected string $detail,
-        string $pointer = null,
+        ?string $pointer = null,
     ) {
         if ($pointer !== null) {
             $this->setPointer($pointer);
diff --git a/src/Exceptions/AbstractException.php b/src/Exceptions/AbstractException.php
index 2b94192..949274b 100644
--- a/src/Exceptions/AbstractException.php
+++ b/src/Exceptions/AbstractException.php
@@ -27,7 +27,7 @@ public function __construct(
         protected string $detail,
         array $errorType,
         protected int $status,
-        Throwable $previous = null,
+        ?Throwable $previous = null,
     ) {
         $this->setErrorCode($errorType['code']);
         $this->setTitle($errorType['title']);
diff --git a/src/Exceptions/AbstractMultiErrorException.php b/src/Exceptions/AbstractMultiErrorException.php
index d5025dd..c4f1425 100644
--- a/src/Exceptions/AbstractMultiErrorException.php
+++ b/src/Exceptions/AbstractMultiErrorException.php
@@ -15,7 +15,7 @@ abstract class AbstractMultiErrorException extends Exception implements MultiErr
     public function __construct(
         protected array $errors,
         protected int $status,
-        Throwable $previous = null,
+        ?Throwable $previous = null,
     ) {
         parent::__construct('Response contains multiple errors.', $status, $previous);
     }
diff --git a/src/Transformers/AbstractTransformer.php b/src/Transformers/AbstractTransformer.php
index bb34f3a..d0bc9e7 100644
--- a/src/Transformers/AbstractTransformer.php
+++ b/src/Transformers/AbstractTransformer.php
@@ -92,7 +92,7 @@ protected function transformRelationshipForIdentifier(
         string $id,
         UnitEnum|string $type,
         string $class,
-        string $parentId = null,
+        ?string $parentId = null,
     ): array {
         $resource = new ResourceIdentifier($id, $type, $parentId);
         $transformer = $this->transformerFactory->createFromModel($class);