Bump PHPStan to level 9

phpstan.neon.dist

@@ -1,5 +1,5 @@
 parameters:
-  level: 5
+  level: 9
   paths:
     - src
     - tests

src/Experience/TwigExtension/ExperienceTwigExtension.php

@@ -8,7 +8,7 @@ use Twig\TwigFunction;
 
 class ExperienceTwigExtension extends AbstractExtension
 {
-    private static $startYear = 2007;
+    private static int $startYear = 2007;
 
     public function getFunctions(): array
     {
@@ -24,6 +24,6 @@ class ExperienceTwigExtension extends AbstractExtension
 
     public function getYearsOfExperience(): int
     {
-        return (new \DateTimeImmutable())->format('Y') - self::$startYear;
+        return (int) (new \DateTimeImmutable())->format('Y') - self::$startYear;
     }
 }

src/Presentation/Collection/Collection.php

@@ -10,6 +10,7 @@ use Iterator;
 use IteratorAggregate;
 
 /**
+ * @implements IteratorAggregate<TItem>
  * @template TItem
  */
 class Collection implements Countable, IteratorAggregate
@@ -26,6 +27,9 @@ class Collection implements Countable, IteratorAggregate
         return count($this->items);
     }
 
+    /**
+     * @return self<TItem>
+     */
     public function filter(callable $callback): self
     {
         return new static(

src/Presentation/Collection/PresentationCollection.php

@@ -7,8 +7,14 @@ namespace App\Presentation\Collection;
 use DateTimeImmutable;
 use Sculpin\Contrib\ProxySourceCollection\ProxySourceItem;
 
+/**
+ * @extends Collection<ProxySourceItem>
+ */
 final class PresentationCollection extends Collection
 {
+    /**
+     * @return Collection<ProxySourceItem>
+     */
     public function getAllEvents(): Collection
     {
         $events = array_reduce(
@@ -24,6 +30,9 @@ final class PresentationCollection extends Collection
         return new Collection(array_merge(...$events));
     }
 
+    /**
+     * @return Collection<ProxySourceItem>
+     */
     public function getPastEvents(): Collection
     {
         $today = new DateTimeImmutable('today');

src/Presentation/TwigExtension/PresentationTwigExtension.php

@@ -21,6 +21,10 @@ class PresentationTwigExtension extends AbstractExtension
         return 'presentations';
     }
 
+
+    /**
+     * @param ProxySourceItem[] $presentations
+     */
     public function getPresentationCount(array $presentations): int
     {
         $presentationCollection = new PresentationCollection($presentations);

tests/Presentation/TwigExtension/PresentationTwigExtensionTest.php

@@ -116,6 +116,8 @@ class PresentationTwigExtensionTest extends TestCase
 
     /**
      * Assert the extension uses the correct number of presentations.
+     *
+     * @param ProxySourceItem[] $presentations
      */
     private function assertPresentationCount(int $expectedCount, array $presentations): void
     {
@@ -127,6 +129,8 @@ class PresentationTwigExtensionTest extends TestCase
 
     /**
      * Create a mock presentation with a list of events.
+     *
+     * @param array{date: int}[] $events
      */
     private function createPresentation(array $events): ProxySourceItem
     {