Javascript library example

fooClass.js

class fooClass {
  constructor(options) {
    this.label = options.label
    
    this.bar()
  }
  bar() {
    console.log(this.label)
  }
}
module.exports = fooClass;

getter-setter.md

https://nemisj.com/why-getterssetters-is-a-bad-idea-in-javascript/

index.js

const fooClass = require ("./fooClass")

var TEST = new fooClass({label:"TEST"})
TEST.label = "TEST2017"
TEST.bar()

// RESULT:
            // TEST
            // Test2017