setTimeout(() => console.log("a"));
 
Promise.resolve()
  .then((first) => {
    console.log("first:", first);
    return "b";
  })
  .then(
    Promise.resolve().then((second) => {
      console.log("second:", second);
      return "c";
    }),
  )
  .then((third) => console.log("third:", third));
 
console.log("d");
 
// d
// first: 1. undefined
// second:1. undefined
// third: b
// a