how to declare a js file uses modules code example
Example 1: import modules js html
<script type="module" src="main.js"></script>
Example 2: js change a value in separate module
//moduleA.js
let object = {
a: 5,
};
export { object };
//moduleB.js
import { object } from './moduleA'
object.a = 6;
object.b = 1;