Node.js で S3 のデータを1行ずつストリームで読み込む

var AWS = require('aws-sdk');
var LineStream = require('byline').LineStream;

var ls = new LineStream();
var s3 = new AWS.S3();

var params = {
  Bucket: "bucket",
  Key: "key"
}

var s3s = s3.getObject(params).createReadStream();
s3s.setEncoding('utf-8');

s3s.pipe(ls).on('data', function(line) {
    //
  });

s3s.on('end', function() {
    //
});