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Syntax: define() to define modules and asynchronous ‍loading.
Use Cases: Widely used in browser-based applications,⁤ especially​ before ES modules ⁣became prevalent.
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 module ⁣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 advancement.
* 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

Regardless of the format, module loaders