Add return types in FileystemLoader

src/Loader/FilesystemLoader.php

@@ -24,6 +24,9 @@ class FilesystemLoader implements LoaderInterface
     /** Identifier of the main namespace. */
     public const MAIN_NAMESPACE = '__main__';
 
+    /**
+     * @var array<string, list<string>>
+     */
     protected $paths = [];
     protected $cache = [];
     protected $errorCache = [];
@@ -31,7 +34,7 @@ class FilesystemLoader implements LoaderInterface
     private $rootPath;
 
     /**
-     * @param string|array $paths    A path or an array of paths where to look for templates
+     * @param string|string[] $paths    A path or an array of paths where to look for templates
      * @param string|null  $rootPath The root path common to all relative paths (null for getcwd())
      */
     public function __construct($paths = [], ?string $rootPath = null)
@@ -48,6 +51,8 @@ class FilesystemLoader implements LoaderInterface
 
     /**
      * Returns the paths to the templates.
+     *
+     * @return list<string>
      */
     public function getPaths(string $namespace = self::MAIN_NAMESPACE): array
     {
@@ -58,6 +63,8 @@ class FilesystemLoader implements LoaderInterface
      * Returns the path namespaces.
      *
      * The main namespace is always defined.
+     *
+     * @return list<string>
      */
     public function getNamespaces(): array
     {
@@ -65,7 +72,7 @@ class FilesystemLoader implements LoaderInterface
     }
 
     /**
-     * @param string|array $paths A path or an array of paths where to look for templates
+     * @param string|string[] $paths A path or an array of paths where to look for templates
      */
     public function setPaths($paths, string $namespace = self::MAIN_NAMESPACE): void
     {