nl_tokens: Pipe the output of this writer to a file .
pl_tokens: function save ( file , options ) { var stream = fs . createWriteStream ( file , <mask> ) ; function onSave ( ) { stream . removeAllListeners ( ) ; this . emit ( 'save' ) ; } function onError ( err ) { stream . removeAllListeners ( ) ; this . emit ( 'error' , err ) ; } stream . on ( 'finish' , onSave . bind ( this ) ) ; stream . on ( 'error' , onError . bind ( this ) ) ; this . pipe ( stream ) ; return this ; }