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Syntax: define() to define modules and‌ require() to import.
Popular Implementations: RequireJS is a well-known AMD loader.
Benefits: ⁤ Excellent for browser-based applications, especially those with​ many dependencies.

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 habitat and use the⁤ appropriate loading mechanism.

Versatility: Works in browsers, Node.js, and other‍ environments.
Complexity: Can be more‌ complex to write than CJS or AMD directly.
Widespread Adoption: ‌ A good choice when you need broad compatibility.

Syntax: import and export keywords.
Native Support: Increasingly supported natively in browsers and Node.js.
Benefits: Improved syntax, static‌ analysis, and tree​ shaking (removing unused code).

How Module Loaders Work: A Closer Look

Let's break down the process of ⁢how a​ module loader typically operates:

1. Configuration: ⁤ You configure the loader with a ‍list of modules and their dependencies. This is often done through ⁢a⁤ configuration file (like require.config.js for RequireJS).
2. dependency Resolution: The loader analyzes the dependencies of each module. It determines the order in which modules need to be loaded.
3. Asynchronous Loading: the loader fetches the required modules asynchronously, ⁤preventing blocking.
4. Execution: Once ​all dependencies are loaded, the module is⁤ executed.
5. Caching: ‍ Loaded modules ⁤are often cached to improve performance on subsequent loads.