Fix PHP 8.1 compatibiltiy issues

Author: Chi-teck

composer.json

@@ -16,7 +16,10 @@
         }
     },
     "config": {
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": false
+        }
     },
     "extra": {
         "branch-alias": {

phpcs.xml

@@ -5,7 +5,11 @@
   <file>./scripts</file>
   <file>./src</file>
   <file>./tests</file>
-  <rule ref="vendor/drupal/coder/coder_sniffer/Drupal"/>
+  <rule ref="vendor/drupal/coder/coder_sniffer/Drupal">
+    <!-- Conflicts with PHP attributes. -->
+    <exclude name="Drupal.Commenting.InlineComment.DocBlock"/>
+    <exclude name="Drupal.Commenting.FunctionComment.Missing"/>
+  </rule>
   <rule ref="vendor/drupal/coder/coder_sniffer/DrupalPractice">
     <exclude name="Drupal.Commenting.VariableComment.Missing"/>
     <exclude name="Drupal.Arrays.Array.LongLineDeclaration"/>

src/Asset/AssetCollection.php

@@ -27,6 +27,7 @@ public function __construct(array $assets = []) {
   /**
    * {@inheritdoc}
    */
+  #[\ReturnTypeWillChange]
   public function offsetSet($key, $value) {
     if ($key === NULL) {
       $this->assets[] = $value;
@@ -39,6 +40,7 @@ public function offsetSet($key, $value) {
   /**
    * {@inheritdoc}
    */
+  #[\ReturnTypeWillChange]
   public function offsetGet($key) {
     if (isset($this->assets[$key])) {
       return $this->assets[$key];