rocket.chat.mqtt/node_modules/msgpack-lite/lib/encoder.js

It's a MQTT Server, using redis to scale horizontally.

// encoder.js

exports.Encoder = Encoder;

var EventLite = require("event-lite");
var EncodeBuffer = require("./encode-buffer").EncodeBuffer;

function Encoder(options) {
  if (!(this instanceof Encoder)) return new Encoder(options);
  EncodeBuffer.call(this, options);
}

Encoder.prototype = new EncodeBuffer();

EventLite.mixin(Encoder.prototype);

Encoder.prototype.encode = function(chunk) {
  this.write(chunk);
  this.emit("data", this.read());
};

Encoder.prototype.end = function(chunk) {
  if (arguments.length) this.encode(chunk);
  this.flush();
  this.emit("end");
};