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#through

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Easy way to create a Stream that is both readable and writable.

  • Pass in optional write and end methods.
  • through takes care of pause/resume logic if you use this.queue(data) instead of ‘this.emit('data’, data).
  • Usethis.pause()andthis.resume()to manage flow.
  • Checkthis.paused<tt>to see current flow state. (writealways returns!this.paused`).

This function is the basis for most of the synchronous streams in event-stream.

var through = require('through')
through(function write(data) {
this.queue(data) //data *must* not be null
},
function end () { //optional
this.queue(null)
})

Or, can also be used without buffering on pause, use ‘this.emit('data’, data)‘, and this.emit('end’)

var through = require('through')
through(function write(data) {
this.emit('data', data)
//this.pause()
},
function end () { //optional
this.emit('end')
})

Extended Options

You will probably not need these 99% of the time.

autoDestroy=false

By default, through emits close when the writable and readable side of the stream has ended. If that is not desired, set autoDestroy=false.

var through = require('through')
//like this
var ts = through(write, end, {autoDestroy: false})
//or like this
var ts = through(write, end)
ts.autoDestroy = false

License

MIT / Apache2