TestDome Interview Question

 const events = require("events");

function createEmitter(onOpen, onClose) {

const emiter = new events.EventEmitter()

emiter.once("open", onOpen)

emiter.once("close", onClose)

return emiter

}

function opened(emitter) {

emitter.emit('open')

}

function closed(emitter) {

emitter.emit('close')

}

let emitter = createEmitter(

() => console.log("Opened!"), () => console.log("Closed!")

);

opened(emitter);

closed(emitter);

module.exports.createEmitter = createEmitter;

module.exports.opened = opened;

module.exports.closed = closed;