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Creates a duplex stream
Taken from event-stream
Takes a writable stream and a readable stream and makes them appear as a readable writable stream.
It is assumed that the two streams are connected to each other in some way.
var cp = require('child_process') , duplex = require('duplexer') , grep = cp.exec('grep Stream') duplex(grep.stdin, grep.stdout)
npm install duplexer