/**
 * Key/checksum-based memoized version of `computed()`.
 * The provided `getKey()` function returns a cache key for each return value from `compute()`.
 * The computed signal will _not update_ for subsequent computed values that result in the same key.
 */
export function computedWithMemo<T = any>(
  compute: () => T,
  getKey: (obj: T) => any,
) {
  let lastKey: T;
  let last: T;
  return computed<T>(() => {
    const result = compute();
    const key = getKey(result);
    if (last !== undefined && key === lastKey) return last;
    lastKey = key;
    last = result;
    return result;
  });
}