Current File : //opt/alt/alt-nodejs11/root/lib/node_modules/npm/node_modules/pumpify/README.md
# pumpify
Combine an array of streams into a single duplex stream using [pump](https://github.com/mafintosh/pump) and [duplexify](https://github.com/mafintosh/duplexify).
If one of the streams closes/errors all streams in the pipeline will be destroyed.
```
npm install pumpify
```
[](http://travis-ci.org/mafintosh/pumpify)
## Usage
Pass the streams you want to pipe together to pumpify `pipeline = pumpify(s1, s2, s3, ...)`.
`pipeline` is a duplex stream that writes to the first streams and reads from the last one.
Streams are piped together using [pump](https://github.com/mafintosh/pump) so if one of them closes
all streams will be destroyed.
``` js
var pumpify = require('pumpify')
var tar = require('tar-fs')
var zlib = require('zlib')
var fs = require('fs')
var untar = pumpify(zlib.createGunzip(), tar.extract('output-folder'))
// you can also pass an array instead
// var untar = pumpify([zlib.createGunzip(), tar.extract('output-folder')])
fs.createReadStream('some-gzipped-tarball.tgz').pipe(untar)
```
If you are pumping object streams together use `pipeline = pumpify.obj(s1, s2, ...)`.
Call `pipeline.destroy()` to destroy the pipeline (including the streams passed to pumpify).
### Using `setPipeline(s1, s2, ...)`
Similar to [duplexify](https://github.com/mafintosh/duplexify) you can also define the pipeline asynchronously using `setPipeline(s1, s2, ...)`
``` js
var untar = pumpify()
setTimeout(function() {
// will start draining the input now
untar.setPipeline(zlib.createGunzip(), tar.extract('output-folder'))
}, 1000)
fs.createReadStream('some-gzipped-tarball.tgz').pipe(untar)
```
## License
MIT
## Related
`pumpify` is part of the [mississippi stream utility collection](https://github.com/maxogden/mississippi) which includes more useful stream modules similar to this one.
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