Node.JS had that ability for a while before it was incorporated in JavaScript with a feature called ‘modules.’ Eventually, they made it to the language itself and the browsers.

The modules in Node.js provide a simple and easy to use API that can be used for File I/O, Networking (using HTTP, TCP, UDP, etc protocols), extend the Node.js library and implement Cryptography ...

Users can use process.features.require_module to check whether the function is activated in the current Node.js instance. For packages, the "module-sync" export condition allows both require() and ...