Static analysis fixes

app/Bootstrap/FilesComposer.php

@@ -30,7 +30,7 @@ class FilesComposer
 
         $this->hiddenFiles = Collection::make(
             $this->config->get('hidden_files', [])
-        )->when($config->get('hide_app_files', true), function ($collection) {
+        )->when($config->get('hide_app_files', true), function (Collection $collection) {
             return $collection->merge(self::APP_FILES);
         })->map(function (string $file) {
             return glob($file, GLOB_BRACE | GLOB_NOSORT);

app/Controllers/DirectoryController.php

@@ -31,7 +31,7 @@ class DirectoryController
     /**
      * Invoke the DirectoryController.
      *
-     * @param \Symfony\Component\Finder\Finder $finder
+     * @param \Symfony\Component\Finder\Finder $files
      * @param \Slim\Psr7\Response              $response
      * @param string                           $path
      *

app/themes/default/functions.php

@@ -25,8 +25,8 @@ return [
         /**
          * Retrieve an item from the theme config.
          *
-         * @param string $key
-         * @param mixed  $default
+         * @param string     $key
+         * @param mixed|null $default
          *
          * @return mixed
          */