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Example:

javascript
    define(['./moduleB'], function(moduleB) {
      return function() {
        console.log('Module A');
        moduleB();
      };
    });
    

3. Worldwide 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.

4. ES Modules (ESM)

the official standard module system ​for JavaScript, introduced with ECMAScript 2015 (ES6). ‍It uses import and export ⁢ keywords. I've found that ESM is becoming increasingly prevalent as browser support ⁢improves.

Example:

javascript
    // moduleA.js
    import moduleB from './moduleB.js';
    export function doSomething() {
      console.log('Module A');
      moduleB();
    }

    // moduleB.js
    export default function() {
      console.log('Module B');
    };
    

While the module formats define how modules are structured, module​ loaders and bundlers ‍are the tools that implement them.

Webpack: A powerful bundler⁣ that can⁣ handle various module formats and perform optimizations like code splitting and minification.
Parcel: A zero-configuration bundler known for ‍its simplicity and speed.
Rollup: ‌Specifically designed for bundling libraries, focusing on creating