nl_tokens: Pipe a stream from one to another
pl_tokens: function pipeStream ( ... args ) { const src = args . shift ( ) ; return new Promise ( ( resolve , reject ) => { let stream = src . on ( 'error' , reject ) ; let target ; while ( ( target = args . shift ( ) ) != null ) { <mask> = stream . pipe ( target ) . on ( 'error' , reject ) ; } stream . on ( 'finish' , resolve ) ; stream . on ( 'end' , resolve ) ; stream . on ( 'close' , resolve ) ; } ) ; }