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.

Modules in Node.js. Node.js includes a collection of modules. Modules encapsulate a collection of related functions into one single unit. You can also export modules if you need to.

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 ...