Calling JavaScript Classes from other files

Oh yeah...something really went wrong with those.

As for what I tried...I tried exporting the class, and I've tried requiring the class. I even tried following the module format to see if that would do anything...but I got errors that the constructor could not be called.

The Class File

class MainClass{
    constructor() {
    }
    Start() {
    }
    Close() {
    }    
}

module.exports = {MainApp: MainClass}


The file calling the class

var main = require("Main");

const mainApp = new main.MainApp();

mainApp.Start();