That vanilla js snippet which avoids polluting global scope exporting a single namespace

global-boilerplate.js

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global.YourNameSpace = factory());
}(this, function () {
  'use strict';
  function method() {}

  var YourNameSpace = {
    method: method
  };

  return YourNameSpace;
}));