gistfile1.js

async.waterfall([
    tmp.tmpName, function(path, cb) {
      var fStream;
      console.log(path);
      fStream = fs.createWriteStream(path);
      fStream.on('end', function() {
        console.log('cheese');
        fStream.end();
        return cb(null, path);
      });
      return request('http://blogs.independent.co.uk/wp-content/uploads/2012/12/some-girls.jpg').pipe(fStream);
    }
  ], function(err, res) {});