I have the code:

// lib.js

var a = a;

export var b = b;



// main.js

console.log(a); // a variable is not available in a global scope

import {b} from lib;

console.log(a); // is a variable available in a global scope or only in a module scope?

Can I use a variable in a global scope after module importing or is it available only in a module scope? Will ES6 modules have a similar working principle like this trick:

// module    

exports.module1 = (function(){ var a = a; })(); // a variable is not available in a global scope