exemple5.js

const Emittery = require('emittery');
const myEmitter = new Emittery();
let value = 1;
myEmitter.on('event', () => {
    value = 2
});
myEmitter.on('event', () => {
    value += 2
});
myEmitter.emit('event');
console.log(value); // This will print 1.

setImmediate(() => {
    console.log(value); // This should print 4
})