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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.
Complexity: Can‍ be more ⁤complex to write than CJS or AMD directly.

Syntax: import and export keywords.
Use Cases: The⁢ modern standard for JavaScript modules, widely supported in⁢ browsers and Node.js.
Example:
```javascript
⁢ ⁤ // ⁣moduleA.js
⁢ ⁣ ‍export⁤ function sayHello() {
⁤ console.log("Hello from Module A!");
}

// ‍moduleB.js
⁢ ⁣ import⁣ { sayHello } from './moduleA.js';