12453.js

async function fn1() {
    console.log(1);
    await new Promise((resolve, reject) => {
        console.log(2);
        resolve();
    })
    console.log(3);

};

fn1();
console.log(4)
console.log(5)

extract_sugar.js

console.log(1)
new Promise(function (resolve, reject) {
    resolve(new Promise((resolve, reject) => {
        console.log(2);
        resolve();
    }))
}).then(() => {
    console.log(3);
})
console.log(4)
console.log(5);