Add phpstan

composer.json

@@ -18,7 +18,8 @@
     "require-dev": {
         "phpunit/phpunit": "^9.5",
         "nyholm/psr7": "^1.3",
-        "phan/phan": "^5.4"
+        "phan/phan": "^5.4",
+        "phpstan/phpstan": "^1.10"
     },
     "autoload": {
         "psr-4": {
@@ -32,6 +33,7 @@
     },
     "scripts": {
         "phan": "phan --progress-bar -o analysis.txt",
+        "phpstan": "vendor/bin/phpstan analyse -l 9 src tests",
         "test": "vendor/bin/phpunit"
     }
 }

src/Command.php

@@ -66,7 +66,7 @@ final class Command
     private $template;
 
     /**
-     * @var array command line options
+     * @var array<mixed> command line options
      */
     private $options = [];
 
@@ -138,7 +138,7 @@ public function getTemplate(): string
     }
 
     /**
-     * @param array $options
+     * @param array<mixed> $options
      * @return Command
      */
     public function setOptions(array $options): Command
@@ -148,7 +148,7 @@ public function setOptions(array $options): Command
     }
 
     /**
-     * @return array
+     * @return array<mixed>
      */
     public function getOptions(): array
     {
@@ -167,7 +167,7 @@ public function addOption(string $option, $argument = null): Command
     }
 
     /**
-     * @param array $options
+     * @param array<mixed> $options
      */
     public function addOptions(array $options): void
     {
@@ -331,7 +331,7 @@ private function escape(string $argument): string
 
     /**
      * Converts option from user-friendly format ot internal format
-     * @param array $options
+     * @param array<mixed> $options
      * @return array
      */
     private function toInternalFormat(array $options): array