Do not report Composer\InstalledVersions (#5)

Author: janedbal

src/ComposerDependencyAnalyser.php

@@ -93,6 +93,10 @@ public function scan(array $scanPaths): array
                         continue;
                     }
 
+                    if ($this->isComposerInternalClass($usedSymbol)) {
+                        continue;
+                    }
+
                     if (!isset($this->optimizedClassmap[$usedSymbol])) {
                         if (!$this->isConstOrFunction($usedSymbol)) {
                             $errors[$usedSymbol] = new ClassmapEntryMissingError($usedSymbol, $filePath);
@@ -225,4 +229,12 @@ private function isConstOrFunction(string $usedClass): bool
         return defined($usedClass) || function_exists($usedClass);
     }
 
+    /**
+     * Those are always available: https://getcomposer.org/doc/07-runtime.md#installed-versions
+     */
+    private function isComposerInternalClass(string $usedSymbol): bool
+    {
+        return $usedSymbol === 'Composer\\InstalledVersions';
+    }
+
 }

tests/data/shadow-dependencies.php

@@ -18,3 +18,5 @@
 
 echo \DIRECTORY_SEPARATOR;
 echo \strlen('');
+
+\Composer\InstalledVersions::getInstalledPackages();