import { useRef } from 'react';

type ResultBox<T> = { v: T };

export function useConstant<T>(fn: () => T): T {
  const ref = useRef<ResultBox<T>>(null);

  if (!ref.current) {
    ref.current = { v: fn() };
  }

  return ref.current.v;
}

export function useConstantCallback<T extends (...args: any[]) => unknown>(
  callback: T
) {
  return useConstant(() => callback);
}