Merge e1c5dc9 into 3f1f3ee

.travis.yml

@@ -1,5 +1,5 @@
 language: php
-dist: trusty
+dist: focal
 
 php:
     - '7.4'

composer.json

@@ -14,14 +14,14 @@
         "psr/container": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.3",
-        "phpstan/phpstan": "^0.12",
-        "phpstan/phpstan-phpunit": "^0.12",
-        "phpstan/extension-installer": "^1.0",
-        "squizlabs/php_codesniffer": "^3.5",
-        "doctrine/coding-standard": "^8.1",
+        "phpunit/phpunit": "^9.4.2",
+        "phpstan/phpstan": "^0.12.52",
+        "phpstan/phpstan-phpunit": "^0.12.16",
+        "phpstan/extension-installer": "^1.0.5",
+        "squizlabs/php_codesniffer": "^3.5.8",
+        "doctrine/coding-standard": "^8.2",
         "roave/security-advisories": "dev-latest",
-        "league/container": "^3.3"
+        "league/container": "^3.3.3"
     },
     "autoload": {
         "psr-4": {

src/CommandBus.php

@@ -4,15 +4,17 @@
 
 namespace League\Tactician;
 
+use Closure;
+
 use function array_pop;
 
 /**
  * Receives a command and sends it through a chain of middleware for processing.
  */
 final class CommandBus
 {
-    /** @var callable */
-    private $middlewareChain;
+    /** @var Closure(object $command):mixed */
+    private Closure $middlewareChain;
 
     public function __construct(Middleware ...$middleware)
     {
@@ -32,7 +34,7 @@ public function handle(object $command)
     /**
      * @param Middleware[] $middlewareList
      */
-    private function createExecutionChain(array $middlewareList): callable
+    private function createExecutionChain(array $middlewareList): Closure
     {
         $lastCallable = static fn () => null;