code: public static function add( $type, $data = [] ) {
  
  		$is_admin = is_admin();
  
  		if ( self::validate( $type, $data, $is_admin ) ) {
  
  			$hook = $is_admin ? 'admin_enqueue_scripts' : 'wp_enqueue_scripts';
  
  			$method = __CLASS__ . "::add_{$type}s";
  
  			if ( has_action( $hook, $method ) === false ) {
  				add_action( $hook, $method );
  			}
  
  			return true;
  		}
  
  		return false;
  	}
docs: Add scripts or styles.
  
  @param string $type → script|style.
  @param array  $data → settings.
  
  @see https://github.com/Josantonius/WP_Register#add
  
  @return boolean