const EventEmitter = require("events");
const emitter = new EventEmitter();

let amount = 0;

emitter.on(
  "test",
  () =>
    new Promise((resolve, reject) => {
      const number = ++amount;
      console.log(`Called number ${number}`);
      setTimeout(() => {
        console.log(`Resolved after one second number ${number}`);
        resolve();
      }, 1000);
    })
);

emitter.emit("test");
emitter.emit("test");

console.log("I'm not waiting for the promises to resolve");

const EventEmitter = require("events");
const emitter = new EventEmitter();

let amount = 0;

emitter.on(
  "test",
  () =>
    new Promise((resolve, reject) => {
      const number = ++amount;
      console.log(`Called number ${number}`);
      setTimeout(() => {
        console.log(`Resolved after one second number ${number}`);
        resolve();
      }, 1000);
    })
);

emitter.emit("test");
emitter.emit("test");

console.log("I'm not waiting for the promises to resolve");