UMD
UMD (Universal Module Definition) is a JavaScript module pattern that allows code to work in multiple environments, including CommonJS (Node.js), AMD (Asynchronous Module Definition) in browsers, and as a global variable. It provides a wrapper that detects the module system in use and exports the module accordingly, enabling cross-platform compatibility for libraries and scripts.
Developers should use UMD when creating JavaScript libraries that need to support both server-side (Node.js) and client-side (browser) environments, or when targeting projects with mixed module systems. It is particularly useful for open-source libraries to ensure broad compatibility without requiring users to configure build tools specifically for their environment.