stream-aggregate-promise

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

var aggregate = require('stream-aggregate-promise')

aggregate(stream)
  .then(function(result) { ... })
  .fail(function(err) { ... })

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.