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.

The open source JavaScript runtime Node.js has reached version 23. ... the "module-sync" export condition allows both require() and import to load the same native ES module.

ECMAScript modules, aka ES modules or ESM, is the official JavaScript module syntax. As such, it is not technically a tool, but it has broad implications for JS development and tools.