rocket.chat.mqtt/node_modules/msgpack-lite/lib/ext-buffer.js

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

// ext-buffer.js

exports.ExtBuffer = ExtBuffer;

var Bufferish = require("./bufferish");

function ExtBuffer(buffer, type) {
  if (!(this instanceof ExtBuffer)) return new ExtBuffer(buffer, type);
  this.buffer = Bufferish.from(buffer);
  this.type = type;
}