rocket.chat.mqtt/node_modules/npm/lib/install/action/postinstall.js

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

'use strict'
var lifecycle = require('../../utils/lifecycle.js')
var packageId = require('../../utils/package-id.js')

module.exports = function (staging, pkg, log, next) {
  log.silly('postinstall', packageId(pkg))
  lifecycle(pkg.package, 'postinstall', pkg.path, next)
}