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javascript
    // moduleA.js
    define(function() {
      return function() {
        console.log("Hello from Module A!");
      };
    });

    // moduleB.js
    define(['./moduleA'], function(moduleA) {
      moduleA();
    });
    

3.⁣ Universal Module Definition (UMD)

UMD ⁢aims to be compatible with both CommonJS and AMD,⁢ providing⁣ a single module ⁤format⁣ that works in various environments. It attempts to detect the module system and adapt accordingly.

Syntax: A wrapper function that checks for different module environments.
Use Cases: ⁤ Useful for creating libraries that need to⁣ work in both Node.js and the browser.

4.⁢ ECMAScript Modules (ESM)

The official standard module system ‍for JavaScript, introduced with ES6 (ES2015).ESM uses static analysis to‍ determine dependencies, enabling⁣ optimizations and⁢ better performance.

Syntax: import ⁣ to import modules and export to⁤ export.
Use Cases: Increasingly becoming the preferred module format for modern JavaScript growth.
* Example:

javascript
    // moduleA.js
    export function sayHello() {
      console.log("Hello from Module A!");
    }

    // moduleB.js
    import { sayHello } from './moduleA.js';
    sayHello();
    

How⁣ Module Loaders Work: A closer Look

Module loaders typically perform these key ⁣functions: