SOURCE

async function async1() {
    console.Log(' async1 start')
    await async2()
    console.Log(' async1 end')
}
async function async2() {
    console.Log(' async2')
}
console.log('script start')
setTimeout(function () {
    console.Log(' setTimeout')
}, 0)
async1()
new Promise(function (resolve) {
    console.log('promise1')
    resolve()
}).then(function () {
    console.log('promise2')
})
console.log('script end')