From 3df55c1210a5915e85b492e7ebda3dff2e37b851 Mon Sep 17 00:00:00 2001
From: Pascal Birchler <pascalb@google.com>
Date: Tue, 9 Sep 2025 16:16:43 +0200
Subject: [PATCH] Fix reported implicit nullable types

---
 src/CSSList/Document.php | 2 +-
 src/Parser.php           | 2 +-
 src/RuleSet/RuleSet.php  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/CSSList/Document.php b/src/CSSList/Document.php
index 7d9c6ec0..fc617f62 100644
--- a/src/CSSList/Document.php
+++ b/src/CSSList/Document.php
@@ -159,7 +159,7 @@ public function createShorthands()
      *
      * @return string
      */
-    public function render($oOutputFormat = null)
+    public function render(?OutputFormat $oOutputFormat = null)
     {
         if ($oOutputFormat === null) {
             $oOutputFormat = new OutputFormat();
diff --git a/src/Parser.php b/src/Parser.php
index f60fc086..92f18c31 100644
--- a/src/Parser.php
+++ b/src/Parser.php
@@ -21,7 +21,7 @@ class Parser
      * @param Settings|null $oParserSettings
      * @param int $iLineNo the line number (starting from 1, not from 0)
      */
-    public function __construct($sText, $oParserSettings = null, $iLineNo = 1)
+    public function __construct($sText, ?Settings $oParserSettings = null, $iLineNo = 1)
     {
         if ($oParserSettings === null) {
             $oParserSettings = Settings::create();
diff --git a/src/RuleSet/RuleSet.php b/src/RuleSet/RuleSet.php
index 8cbbd34f..1362a544 100644
--- a/src/RuleSet/RuleSet.php
+++ b/src/RuleSet/RuleSet.php
@@ -102,7 +102,7 @@ public function getLineNo()
      *
      * @return void
      */
-    public function addRule(Rule $oRule, $oSibling = null)
+    public function addRule(Rule $oRule, ?Rule $oSibling = null)
     {
         $sRule = $oRule->getRule();
         if (!isset($this->aRules[$sRule])) {