async / await Output Order

1async function async1() {
2  console.log('async1 start');
3  await async2();
4  console.log('async1 end');
5}
6 
7async function async2() {
8  console.log('async2');
9}
10 
11console.log('script start');
//output: 1
12 
13setTimeout(() => {
14  console.log('setTimeout');
15}, 0);
16 
17async1();
18 
19new Promise((resolve) => {
20  console.log('promise1');
21  resolve();
22}).then(() => {
23  console.log('promise2');
24});
25 
26console.log('script end');