invert-stream

Create a pair of streams (A, B) such that A.write(X) -> B.emit('data', X)
and B.write(X) -> A.emit('data', X)

`` js

var invert = require('invert-stream')

var inverted = invert()

in_steam.pipe(inverted.other).pipe(out_stream)

inverted.write(data_for_outstream)
inverted.on('data', data_from_in_stream)

why ?

this is useful for a couple of things.

* testing streams based stuff
* making flexible duplex stream apis

an invert-stream pair is like a tcp connection,
but in-process and synchronous. It's way easier to test
edge cases related to event order if you stuff works sync.

Also, it's useful making duplex streams, or multiple streams into one.

$3

`js

var spawn = require('child_process').spawn
var invert = require('invert-stream')

var ch = spawn(cmd, args)
var inverted = invert()

ch.stdout.pipe(inverted.other).pipe(ch.sdin)

//now, we have just ONE stream: inverted

//write to che ch's stdin
inverted.write(data)

//read from ch's stdout
inverted.on('data', ...)

``

License

MIT