event-emitter.js

const {EventEmitter} = require('events');
const emitter = new EventEmitter();

emitter.on('message', (message) => {
    console.log(`Handler 1 message: ${message}`);
});

emitter.on('message', (message) => {
    console.log(`Handler 2 message: ${message}`);
});

emitter.on('message', (message) => {
    console.log(`Handler 3 message: ${message}`);
});

emitter.emit('message', 'hi there!');
console.log('This runs in the last :|');