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Syntax: define() to define modules and⁢ asynchronous loading.
Use Cases: ‌ Historically popular in browser-based JavaScript progress, particularly with libraries like RequireJS.
Example:

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

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

Universal Module⁣ Definition (UMD)

UMD aims to be compatible ​with both CommonJS and AMD, allowing your modules⁣ to work in various environments.It ⁤attempts ‍to ⁣detect the module​ system and use the appropriate loading mechanism.

Syntax: A ‍wrapper function that checks for different module environments.
Use⁤ Cases: Creating ​modules that can be used in both Node.js and the browser. complexity: Can be more complex to write than CJS or⁣ AMD.

Syntax: import and export keywords.
Use cases: The preferred ​module system 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();
    

Module ‌Bundlers: Taking it a ​Step Further