buffer, transform, and re-stream
npm install unstream 
Like concat-stream, or bl except it returns a transform stream, allowing you to continue streaming after concat-buffering.
Currently unstream doesn't support object-mode.
#### unstream(options, transformFn (body, callback(err, data)) { })
``javascript
var unstream = require('unstream');
fs.createReadStream('file')
.pipe(unstream({ limit: 1024 }, function (data, callback) {
callback(null, data.toUpperCase());
}))
.pipe(process.stdout);
`
#### options
Options object. Same as TransformStream options, plus some extras:
- limit [Number] - maximum number of bytes to buffer. The default is Infinity. Set this to a hard limit to prevent memory leaks.
#### transformFn (body, callback) { }
Function that gets called when the buffering is complete.
- body [Buffer] - fully buffered data from the source stream.callback(err, data)
- - Call this to continue streaming the data` to the destination. This allows you to perform a transform on the fully buffered data, and re-stream it.
#### License
MIT