feat: add dead code detector

composer.json

@@ -70,6 +70,7 @@
         "phpunit/phpunit": "^10.5",
         "pyrech/composer-changelogs": "^2.1",
         "roave/security-advisories": "dev-master",
+        "shipmonk/dead-code-detector": "^0.1.0",
         "symfony/cache": "^6.4 || ^7.0",
         "symfony/framework-bundle": "^6.4 || ^7.0",
         "symfony/http-kernel": "^6.4 || ^7.0",
@@ -79,6 +80,7 @@
         "symfony/phpunit-bridge": "^6.4 || ^7.0",
         "symfony/twig-bundle": "^6.4 || ^7.0",
         "symfony/yaml": "^6.4 || ^7.0",
+        "tomasvotruba/unused-public": "^0.3.5",
         "twig/twig": "^3.8"
     },
     "suggest": {

phpstan.neon

@@ -5,3 +5,13 @@ parameters:
         - tests/
     editorUrl: 'phpstorm://open?file=%%file%%&line=%%line%%'
     tmpDir: %currentWorkingDirectory%/.phpstan
+    unused_public:
+        methods: true
+        properties: true
+        constants: true
+
+services:
+    -
+        class: FriendsOfOpenTelemetry\OpenTelemetryBundle\DeadCodeEntrypoint
+        tags:
+            - shipmonk.deadCode.entrypointProvider

src/DeadCodeEntrypoint.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace FriendsOfOpenTelemetry\OpenTelemetryBundle;
+
+use FriendsOfOpenTelemetry\OpenTelemetryBundle\DependencyInjection\OpenTelemetryExtension;
+use PHPStan\Reflection\ReflectionProvider;
+use PHPUnit\Framework\TestCase;
+use ShipMonk\PHPStan\DeadCode\Provider\EntrypointProvider;
+
+class DeadCodeEntrypoint implements EntrypointProvider
+{
+    public function __construct(
+        private ReflectionProvider $reflectionProvider
+    ) {
+    }
+
+    public function isEntrypoint(\ReflectionMethod $method): bool
+    {
+        $methodName = $method->getName();
+        $reflection = $this->reflectionProvider->getClass($method->getDeclaringClass()->getName());
+
+        return ($reflection->is(OpenTelemetryBundle::class)
+            || $reflection->is(OpenTelemetryExtension::class))
+            && false === $reflection->isSubclassOf(TestCase::class);
+    }
+}