rocket.chat.mqtt/node_modules/bluebird/js/release/bluebird.js

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

"use strict";
var old;
if (typeof Promise !== "undefined") old = Promise;
function noConflict() {
    try { if (Promise === bluebird) Promise = old; }
    catch (e) {}
    return bluebird;
}
var bluebird = require("./promise")();
bluebird.noConflict = noConflict;
module.exports = bluebird;