call one function into another in js without HTML file

Question

This was interview question for me. How we can access a function defined in one.js in two.js?

I told them an answer using HTML, but they were looking for an answer that didn't involve linking via the HTML.

How is this possible?

Answer 1

If you can control the script tag of one.js, make it a module, and import from two.js:

<script type="module" src="one.js">

// one.js
import { foo } from './two.js';
foo();

// two.js
export const foo = () => {
  console.log('foo running');
};

ES6 modules in the browser aren't supported everywhere, but they're supported on most modern browsers.

Answer 2

They might have been asking for Node.js require.

Here is an example of what that might look like, calling a function from one.js in two.js:

// one.js
module.exports = function () {
    console.log('Hello World')
}

// two.js
const myFunction = require('./two.js')
myFunction()