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Syntax: define() to define modules and asynchronous loading.
Use cases: Popular in browser-based applications,especially before ⁢ES modules were widely supported.
Example:

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

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

3. Global 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 and ‍ export ⁣keywords.
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:

1.