PHPStan level 9

.php-cs-fixer.dist.php

@@ -10,6 +10,7 @@
         'import_constants' => true,
         'import_functions' => true,
     ],
+    'phpdoc_to_comment' => ['ignored_tags' => ['var']],
     'yoda_style' => false,
 ])
     ->setFinder($finder);

README.md

@@ -3,7 +3,7 @@
 [![Build](https://github.com/nkl-kst/the-sports-db/workflows/Build/badge.svg)](https://github.com/nkl-kst/the-sports-db/actions)
 [![Packagist Version](https://img.shields.io/packagist/v/nkl-kst/the-sports-db)](https://packagist.org/packages/nkl-kst/the-sports-db)
 [![Coverage Status](https://coveralls.io/repos/github/nkl-kst/the-sports-db/badge.svg?branch=master)](https://coveralls.io/github/nkl-kst/the-sports-db?branch=master)
-[![PHPStan Level](https://img.shields.io/badge/PHPStan-level%208-brightgreen.svg?style=flat)](https://github.com/nkl-kst/the-sports-db/actions)
+[![PHPStan Level](https://img.shields.io/badge/PHPStan-level%209-brightgreen.svg?style=flat)](https://github.com/nkl-kst/the-sports-db/actions)
 [![GitHub](https://img.shields.io/github/license/nkl-kst/the-sports-db)](https://github.com/nkl-kst/the-sports-db/blob/master/LICENSE.md)
 
 An easy-to-use PHP library to get data from https://www.thesportsdb.com.

phpstan.neon

@@ -1,5 +1,5 @@
 parameters:
-    level: 8
+    level: 9
     paths:
         - src
         - test

src/Serializer/AbstractSerializer.php

@@ -67,18 +67,25 @@ private function validate(?object $json): ?string
     public function serialize(string $content): array
     {
         $json = json_decode($content);
+        if (!is_object($json)) {
+            $json = null;
+        }
 
         if ($message = $this->validate($json)) {
             throw new Exception($message);
         }
 
+        // Tested in self::validate()
+        assert($json !== null);
+
         $innerJson = $json->{$this->getJsonRootName($json)};
 
         // Don't serialize if the API endpoint returned null instead of an empty array
         if (null === $innerJson) {
             return [];
         }
 
+        /** @var TObject[] */
         return $this->mapper->mapArray($innerJson, [], $this->getEntityClass());
     }
 }

test/unit/Dependency/DependencyContainerTest.php

@@ -25,7 +25,10 @@ protected function setUp(): void
      */
     private function getBuilder(): ContainerBuilder
     {
-        return TestUtils::getHiddenStaticProperty(DependencyContainer::class, 'builder');
+        $containerBuilder = TestUtils::getHiddenStaticProperty(DependencyContainer::class, 'builder');
+        assert($containerBuilder instanceof ContainerBuilder);
+
+        return $containerBuilder;
     }
 
     private function getMethod(string $method): Closure