console.log('1: start');

setTimeout(() => console.log('2: setTimeout'), 0);

Promise.resolve()
  .then(() => {
    console.log('3: promise 1');
    return Promise.resolve('chained');
  })
  .then((val) => console.log(`4: ${val}`));

queueMicrotask(() => console.log('5: microtask'));

new Promise((resolve) => {
  console.log('6: executor');
  resolve();
}).then(() => console.log('7: promise 2'));

console.log('8: end');