Object version of promiseAll

PromiseAllObject.ts

type PromiseAllObjectInput<T> = {
  [P in keyof T]: Promise<T[P]>;
};

export async function promiseAllObject<T>(
  obj: PromiseAllObjectInput<T>,
): Promise<T> {
  const promiseArray = await Promise.all(Object.values(obj));

  return Object.keys(obj)
    .map((key, index) => ({key, index}))
    .reduce(
      (total, {key, index}) => ({...total, [key]: promiseArray[index]}),
      {},
    ) as T;
}