const relayResponseCache = new RelayQueryResponseCache({ size: 250, ttl: oneMinute });

const cacheHandler = async (
  request: RequestNode,
  variables: Variables,
  cacheConfig: CacheConfig,
  uploadables: UploadableMap,
) => {
  const queryID = request.text;

  if (isMutation(request)) {
    relayResponseCache.clear();
    return fetchFunction(request, variables, cacheConfig, uploadables);
  }

  const fromCache = relayResponseCache.get(queryID, variables);

  if (isQuery(request) && fromCache !== null && !forceFetch(cacheConfig)) {
    return fromCache;
  }

  const fromServer = await fetchFunction(request, variables, cacheConfig, uploadables);
  if (fromServer) {
    relayResponseCache.set(queryID, variables, fromServer);
  }

  return fromServer;
};