NodeのBufferを連結する何か

bufferAdd.js

var buf1 = new Buffer([0xe3, 0x81]);
var buf2 = new Buffer([0x82, 0xe3, 0x81, 0x84])

Buffer.prototype.push = function (buf) {
  var newBuf = new Buffer(this.length + buf.length);
  this.copy(newBuf);
  buf.copy(newBuf, this.length);
  return newBuf;
}

console.log(buf1.push(buf2));
console.log(buf1.push(buf2).toString());