nl_tokens: Clean listeners .
pl_tokens: function cleanup ( ) { emitter . removeListener ( 'data' , ondata ) emitter . removeListener ( 'end' , onend ) emitter . removeListener ( 'error' , onerror ) emitter . removeListener ( 'end' , cleanup ) emitter . removeListener ( 'close' , cleanup ) dest . removeListener ( 'error' , onerror ) <mask> . removeListener ( 'close' , cleanup ) }