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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. 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 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 development.
* 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

Irrespective of the format,module loaders