add phpstan config and deps

composer.json

@@ -31,7 +31,9 @@
     "heimrichhannot/contao-test-utilities-bundle": "^0.1",
     "phpunit/phpunit": "^8.0 || ^9.0",
     "php-coveralls/php-coveralls": "^2.0",
-    "symfony/phpunit-bridge": "^3.2 || ^4.0 || ^5.0"
+    "symfony/phpunit-bridge": "^3.2 || ^4.0 || ^5.0",
+    "phpstan/phpstan": "^1.10",
+    "phpstan/phpstan-symfony": "^1.2"
   },
   "conflict": {
     "heimrichhannot/contao-encore-bundle": "<1.5"

phpstan.neon

@@ -0,0 +1,19 @@
+parameters:
+  level: 0
+  paths:
+    - src/Util
+    - tests/Util
+#  universalObjectCratesClasses:
+#    - Contao\LayoutModel
+#    - Contao\Model
+#    - Contao\Template
+#    - PHPUnit\Framework\MockObject\MockObject
+#  ignoreErrors:
+#    - message: '#^Call to an undefined method PHPUnit\\Framework\\MockObject\\MockObject\:\:setName\(\)\.$#'
+#      path: tests/EventListener/Contao/ParseTemplateListenerTest.php
+#    - message: '#^Call to an undefined method Symfony\\Component\\Config\\Definition\\Builder\\NodeDefinition\:\:getChildNodeDefinitions\(\)\.$#'
+#      path: tests/DependencyInjection/ConfigurationTest.php
+#    - message: '#^Call to an undefined method Symfony\\Component\\Config\\Definition\\NodeInterface\:\:getChildren\(\)\.$#'
+#      path: tests/DependencyInjection/ConfigurationTest.php
+includes:
+  - vendor/phpstan/phpstan-symfony/extension.neon