Gist for my "WordPress: Laravel Mix, Sass and ES6 Modules in theme development" tutorial at https://since1979.dev/wordpress-laravel-mix-sass-and-es6-modules-in-theme-development/

es6-module-example.js

var Example = {

  settings: {
    setting: 'Initial value'
  },

  init: function( options ) {
    // Do some init stuff like process settings.
    this.settings.setting = options.setting;

    // Run your custom code.
    this.startRunningYourCode()
  },

  startRunningYourCode: function() {
    // Your custom code goes here.
    console.log( this.settings.setting );
  }
    
}

export default Example;