//Please Note that this is just an example. Im not actually using it like this I just want to learn how I would go about it.
//File A
function randint(){
    var number = Math.floor(Math.random() * (d[1] - 0)) + 1;
};

//File B
const functions = require("./fileA");
//How can I run the function from that file and others if there was more?
console.log(number);
var sum = number + number;
console.log(sum)