code: function( cytoscape, jq ){
  
      if( !cytoscape || !jq ){ return; } // can't register if cytoscape unspecified
  
      $ = jq;
  
      cytoscape( 'core', 'navigator', function( options ){
        var cy = this;
  
        return new Navigator( cy, options );
      } );
  
    }
docs: registers the extension on a cytoscape lib ref