Client on node: Uncaught ReferenceError: require is not defined

Question

So, I am writing an application with the node/express + jade combo.

I have client.js, which is loaded on the client. In that file I have code that calls

Answer 1

ES6: In html include main js file using attribute type="module" (browser support):

And in script.js file include another file like that:

import { hello } from './module.js';
...
// alert(hello());

Inside included file (module.js) you must export function/class that you will import

export function hello() {
    return "Hello World";
}

Working example here. More info here