stream-aggregate

Aggregates a Node.js stream and calls a callback with the accumulated result of
first encountered error.

var aggregate = require('stream-aggregate')

aggregate(stream, function(err, result) {
...
});

Binary streams (which emit buffer objects) are aggregated into a single buffer,
object streams -- into an array of emitted objects and streams of strings --
into a single concatenated string.

The main difference between this library and concat-stream is that
stream-aggregate calls callback with an error which is usually desired
behaviour.