private function set_tags(){
    if ( $this->mode ){
      if ( $this->mode === 'vue' ){
        $tags = \bbn\x::merge_arrays($this->all_tags['js'], $this->all_tags['vue']);
      }
      else {
        $tags = $this->all_tags[$this->mode];
      }
      $this->tags = \bbn\x::merge_arrays($this->all_tags['common'], $tags);
      return $this->tags;
    }
  }