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

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

// encode.js

exports.encode = encode;

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

function encode(input, options) {
  var encoder = new EncodeBuffer(options);
  encoder.write(input);
  return encoder.read();
}