const errorLink = onError(
    ({ graphQLErrors, networkError, operation, forward }) => {
      if (graphQLErrors)
        graphQLErrors.map(({ message, extensions }) => {
          switch (extensions.code) {
            case "invalid-jwt":
              // refetch the jwt
              const oldHeaders = operation.getContext().headers;
              const token = getAccessToken();
              operation.setContext({
                headers: {
                  ...oldHeaders,
                  authorization: `Bearer ${token}`
                }
              });
              // retry the request, returning the new observable
              return forward(operation);
              break;
            default:
              // default case
              console.log(extensions.code);
          }
        });
      if (networkError) {
        console.log(`[Network error]: ${networkError}`);
        props.history.push("/network-error");
      }
    }
  );