Install & configure shipmonk/dead-code-detector

Author: janedbal

build/phpstan.neon

@@ -4,6 +4,7 @@ includes:
 	- ../vendor/phpstan/phpstan-phpunit/extension.neon
 	- ../vendor/phpstan/phpstan-phpunit/rules.neon
 	- ../vendor/phpstan/phpstan-strict-rules/rules.neon
+	- ../vendor/shipmonk/dead-code-detector/rules.neon
 	- ../conf/bleedingEdge.neon
 	- ../phpstan-baseline.neon
 	- ../phpstan-baseline.php
@@ -20,6 +21,10 @@ parameters:
 		- ../tests/phpstan-bootstrap.php
 	cache:
 		nodesByStringCountMax: 128
+	shipmonkDeadCode:
+		usageExcluders:
+			tests:
+				enabled: true
 	checkUninitializedProperties: true
 	checkMissingCallableSignature: true
 	excludePaths:
@@ -71,6 +76,12 @@ parameters:
 		- '#should be contravariant with parameter \$node \(PhpParser\\Node\) of method PHPStan\\Rules\\Rule<PhpParser\\Node>::processNode\(\)$#'
 		- '#Variable property access on PhpParser\\Node#'
 		- '#Test::data[a-zA-Z0-9_]+\(\) return type has no value type specified in iterable type#'
+		-
+			identifier: shipmonk.deadMethod
+			message: '#^Unused .*?Factory::create#' # likely used in DIC
+		-
+			identifier: shipmonk.deadMethod
+			path: ../src/Reflection/BetterReflection/SourceLocator/FileReadTrapStreamWrapper.php
 		-
 			message: '#Fetching class constant class of deprecated class DeprecatedAnnotations\\DeprecatedFoo.#'
 			path: ../tests/PHPStan/Reflection/Annotations/DeprecatedAnnotationsTest.php

composer.json

@@ -62,6 +62,7 @@
 		"phpstan/phpstan-strict-rules": "^2.0",
 		"phpunit/phpunit": "^9.6",
 		"shipmonk/composer-dependency-analyser": "^1.5",
+		"shipmonk/dead-code-detector": "dev-api-phpdoc",
 		"shipmonk/name-collision-detector": "^2.0"
 	},
 	"config": {