Promise.allSettled()

const promise1 = Promise.resolve(3);
const promise2 = new Promise((resolve, reject) =>
  setTimeout(reject, 100, "foo"),
);
const promises = [promise1, promise2];
Promise.allSettled(promises).then((results) =>
  results.forEach((result) => console.log(result.status)),
);
// 予想される結果:
// "fulfilled"
// "rejected"

Promise.allSettled(iterable)

Promise.allSettled([
  Promise.resolve(33),
  new Promise((resolve) => setTimeout(() => resolve(66), 0)),
  99,
  Promise.reject(new Error("an error")),
]).then((values) => console.log(values));
// [
//   { status: 'fulfilled', value: 33 },
//   { status: 'fulfilled', value: 66 },
//   { status: 'fulfilled', value: 99 },
//   { status: 'rejected', reason: Error: an error }
// ]