code: public function getAllFileTypes()
      {
          $fileTypes = [];
          foreach ($this->rulesets as $ruleset) {
              if (is_array($ruleset['file_types'])) {
                  $fileTypes = array_merge($fileTypes, $ruleset['file_types']);
              }
          }
          $fileTypes = array_unique($fileTypes);
          return $fileTypes;
      }
docs: Returns all file types found in the various rulesets.
  
  @return array