utils.tsx

import { useEffect, useState, type DependencyList } from 'react';

export function useAsyncMemo<T>(factory: () => Promise<T> | undefined | null, deps: DependencyList, initial?: T) {
  const [val, setVal] = useState<T | undefined>(initial);
  useEffect(() => {
    let cancel = false;
    const promise = factory();
    if (promise === undefined || promise === null) return;
    promise.then(val => {
      if (!cancel) {
        setVal(val);
      }
    });
    return () => {
      cancel = true;
    };
  }, deps);
  return val;
}