PHPstan analysis.

composer.json

@@ -3,7 +3,8 @@
         "symfony/console": "^5.4",
         "symfony/yaml": "^5.4",
         "twig/twig": "^3.6",
-        "symfony/process": "^5.4"
+        "symfony/process": "^5.4",
+        "monolog/monolog": "^2.9"
     },
     "autoload": {
         "psr-4": {
@@ -11,6 +12,7 @@
         }
     },
     "require-dev": {
-        "squizlabs/php_codesniffer": "*"
+        "squizlabs/php_codesniffer": "*",
+        "phpstan/phpstan": "^1.10"
     }
 }