Configuring Psalm to find unused code by default

bin/roave-infection-static-analysis-plugin

@@ -49,7 +49,7 @@ use function var_export;
         ));
     })();
 
-    require_once $projectPath . '/vendor/autoload.php';
+    require_once __DIR__ . '/../vendor/autoload.php';
 
     if (! defined('PSALM_VERSION')) {
         define('PSALM_VERSION', InstalledVersions::getVersion('vimeo/psalm'));
@@ -65,7 +65,7 @@ use function var_export;
 
     RuntimeCaches::clearAll();
 
-    $configuration = $configuration ?? $projectPath;
+    $configuration ??= $projectPath;
 
     if (is_file($configuration)) {
         $config = Config::loadFromXMLFile($configuration, $projectPath);

psalm.xml

@@ -5,9 +5,11 @@
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
     name="Example Psalm config with recommended defaults"
     errorLevel="1"
+    findUnusedBaselineEntry="true"
+    findUnusedCode="true"
 >
     <projectFiles>
-        <directory name="bin"/>
+        <file name="bin/roave-infection-static-analysis-plugin"/>
         <directory name="src"/>
         <directory name="test/unit"/>
         <ignoreFiles>
@@ -63,11 +65,11 @@
             </errorLevel>
         </PropertyNotSetInConstructor>
 
-        <!-- composer/package-versions-deprecated is in use by design -->
-        <DeprecatedClass>
+        <!-- phpunit tests are entry points - they are generally unused -->
+        <UnusedClass>
             <errorLevel type="suppress">
-                <referencedClass name="PackageVersions\Versions"/>
+                <directory name="test"/>
             </errorLevel>
-        </DeprecatedClass>
+        </UnusedClass>
     </issueHandlers>
 </psalm>

src/Roave/InfectionStaticAnalysis/CliUtility.php

@@ -12,12 +12,8 @@
 use function substr;
 
 /** @internal */
-final class CliUtility
+abstract class CliUtility
 {
-    private function __construct()
-    {
-    }
-
     /**
      * @param list<non-empty-string> $arguments
      * @param non-empty-string       $argument