add missing comments and typehits to validate phpstan in the newer version

Author: kpicaza

grumphp.yml

@@ -1,6 +1,6 @@
-parameters:
-    git_dir: .
-    bin_dir: vendor/bin
+grumphp:
+    hooks_dir: .
+    hooks_preset: local
     tasks:
         composer_script:
             script: check-all

src/Container/Config/ConfigProvider.php

@@ -9,6 +9,9 @@
 
 class ConfigProvider
 {
+    /**
+     * @return array<mixed>
+     */
     public function __invoke(): array
     {
         return [

src/ListenerCollection.php

@@ -8,6 +8,9 @@
 
 use function array_key_exists;
 
+/**
+ * @implements \IteratorAggregate<mixed>
+ */
 class ListenerCollection implements IteratorAggregate, ListenerCollectorInterface, ListenerLocatorInterface
 {
     /** @var array<string, array<int, callable>> */
@@ -28,6 +31,9 @@ public function addListener(string $eventClass, callable $listener): void
         $this->listeners[$eventClass] = [$listener];
     }
 
+    /**
+     * @return iterable<callable>
+     */
     public function get(string $eventClass): iterable
     {
         if ($this->has($eventClass)) {
@@ -40,6 +46,9 @@ public function has(string $eventClass): bool
         return array_key_exists($eventClass, $this->listeners);
     }
 
+    /**
+     * @return \Generator<mixed>|\Traversable<mixed>
+     */
     public function getIterator()
     {
         yield from $this->listeners;

src/ListenerLocatorInterface.php

@@ -7,5 +7,9 @@
 interface ListenerLocatorInterface
 {
     public function has(string $eventClass): bool;
+
+    /**
+     * @return iterable<mixed>
+     */
     public function get(string $eventClass): iterable;
 }

src/ListenerProvider.php

@@ -24,7 +24,7 @@ public function addListener(string $eventClass, callable $listener): void
 
     /**
      * @param StoppableEventInterface $event
-     * @return iterable
+     * @return iterable<object>
      */
     public function getListenersForEvent(object $event): iterable
     {