snippet.md

Avoid live "then()-ables"

Like a Promise, await will call any .then() function on its operand. This can be used to create values that change every time they are awaited.

let lastId = 1;
const id = {
  then(fn, errfn) {
    fn(lastId++);
  }
};
async function foo() {
  console.log(await id); // 1
  console.log(await id); // 2
}

Just run it in Canary’s console ;)

Not sure but for this, thats better to use generator no ?
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/yield