npm dependencies not installed

[alceasan]

When loading an additional module in libs/customAutoload (mqtt in my case), it always fails on start because required dependencies are not installed:

Failed to Load Module : mqtt.js { Error: Cannot find module 'mqtt' at Function.Module._resolveFilename (module.js:548:15) at Module.Hook._require.Module.require (/usr/local/lib/node_modules/pm2/node_modules/require-in-the-middle/index.js:61:29) at require (internal/module.js:11:18) at Object.<anonymous> (/opt/shinobi/libs/customAutoLoad/mqtt.js:4:14) at Module._compile (module.js:653:30) at Object.Module._extensions..js (module.js:664:10) at Module.load (module.js:566:32) at tryModuleLoad (module.js:506:12) at Function.Module._load (module.js:498:3) at Module.require (module.js:597:17) at Module.Hook._require.Module.require (/usr/local/lib/node_modules/pm2/node_modules/require-in-the-middle/index.js:80:39) at require (internal/module.js:11:18) at /opt/shinobi/libs/customAutoLoad.js:49:25 at Array.forEach (<anonymous>) at /opt/shinobi/libs/customAutoLoad.js:43:28 at FSReqWrap.oncomplete (fs.js:135:15) code: 'MODULE_NOT_FOUND' }

We need a way to configure additional npm dependencies so they are installed on start.