import { useCallback } from 'react';
import { useSWRConfig } from 'swr';

/**
 * Returns a function that revalidates every SWR cache entry whose key starts with the given URL.
 * It uses the cache from the nearest `SWRConfig` (the one the framework provides to each
 * component), so it must be called from a component rendered inside that provider.
 */
export const useHandleMutate = () => {
  const { mutate } = useSWRConfig();

  return useCallback(
    (url: string) => mutate((key) => typeof key === 'string' && key.startsWith(url), undefined),
    [mutate],
  );
};