function getRejectedPromise() {
  const promise = new Promise((resolve, reject) => {
    reject('some error');
  });
  return promise;
}

let counter = 0;
const interval = setInterval(() => {
  if (++counter > 10) clearInterval(interval);
  else console.log(`async counter: ${counter}`);
}, 500);

getRejectedPromise()
  .then(() => console.log('Never be called. But rejection will not be visible in the console and main thread will be alive.'));

console.log('will be reached');

setTimeout(() => console.log('2nd async console output'), 3000);
setTimeout(() => console.log('1 async console output'), 0);
setTimeout(() => console.log('last async console output'), 6000);