Export modules individually: 
export const name = "Jesse";
export const age = 40; 

Export all at once: 
const name = "Jesse";
const age = 40;
export {name, age};

Can only have one default export in a file: 
const message = () => {
const name = "Jesse";
const age = 40;
return name + ' is ' + age + 'years old.';
};
export default message;

Multiple imports:
import { name, age } from "./person.js";

Import default export:
import message from "./message.js";

To use modules:
<script type="module" src="main.js"></script>