Promise.allEntries

promise-all-entries.js

Promise.allEntries = (entries) =>
  Promise.all(Array.from(entries).map((entry) => Promise.all(entry)));

const obj = {
  foo: Promise.resolve("bar"),
};

const resolvedObject = Object.fromEntries(
  await Promise.allEntries(Object.entries(obj))
);

const map = new Map();
map.set(Promise.resolve("foo"), Promise.resolve("bar"));

const resolvedMap = new Map(await Promise.allEntries(map.entries()));