Add list of valid indexer options

src/Options.php

@@ -11,6 +11,11 @@ class Options
      */
     public $fileTypes = ['.php'];
 
+    /**
+     * List of options that affect the indexer
+     */
+    private $indexerOptions = ['fileTypes'];
+
     /**
      * Validate/Filter input and set options for file types
      *
@@ -26,6 +31,16 @@ class Options
         $this->fileTypes = !empty($fileTypes) ? $fileTypes : $this->fileTypes;
     }
 
+    /**
+     * Get list with options that affect the indexer
+     *
+     * @return array
+     */
+    public function getIndexerOptions(): array
+    {
+        return $this->indexerOptions;
+    }
+
     /**
      * Filter valid file type
      *