Exportar e importar desde un módulo

/*test.js*/
const add = (x, y) => {
    return x + y
}

const subtract = (x, y) => {
    return x - y;
}
var a = "a";
var b = "b"; 
export {a, b, subtract, add}

/*index.ejs*/


<script type="module">  
	import {add, subtract, a} from '/javascripts/test.js';
	window.onload = function()
	{
	console.log(add(2, 3));
	console.log(subtract(6,3));
	console.log(a);
	}
	</script>
Javasper