I use node `pkg` to create a .exe of my nodejs service: <https://www.npmjs.com/package/pkg>

My question is: **how do I make the .exe use a config.js for some setup values?** Basic stuff like ip, port, database name etc. Because I have 3 environments, and I would like to use the same exe for all, but different config.js files for each.

So far, if I do `pkg app.js` then it creates an .exe that doesn't look at any other files. Totally stand alone. How do I make it look at `config.js` when it is started up?

On the website they do have a section on `config` <https://github.com/zeit/pkg#config> but I do not understand how to make use of it. At the moment I have my app.js, and I have secrets.js which holds the config information.