I was looking for a way to use Node's EventEmitters without having to use classes/prototypes on my modules and turns out thanks to the caching of modules, this way of creating event emitters is possible.

Basically I create a module (let's call it a) where there's an init function that gets called when the module is required and exports an event emitter that's used along the a module. Thanks to caching, the init function get's called just once even if it's required in several other modules and/or the index.js and the EventEmitter works just like it should. This is the prototype I made for this test and an asciinema with the output: