How to use the same function for both export and run directly through the console with parameters?

Question

JavaScript

How to use the same function, placed in a separate file (module), both for export and for launching directly through the console with parameters?
Let there be a file called mod.js like

const func = (arg) => console.log( arg + 1 )

module.exports = func

I want to call func from the console like this
node mod func 5
output to the console
6