axiosInstance.interceptors.response.use(

  function (response): AxiosResponse {
    return response;
  },
  function (error: AxiosError) {
    if (
      error.response?.status === HTTP_UNAUTHENTICATED &&
      error.config?.method !== "head"
    ) {
      return handleUnauthenticated(error);
    } else if (
      error.response?.status === HTTP_NOT_FOUND &&
      !isReadOnly(error.config!)                                   // This line without ! gives an error
    ) {
      router.currentRoute.value.meta.ignoreChanges = true;
      router.push({ name: "home" }).catch(ignoreException).then();
    }

    if (
      error.response?.headers["content-type"] ===
        "application/problem+json; charset=utf-8" &&
      error.config?.headers &&
      error.config?.headers[ERROR_HANDLING_HEADER] !== LOCAL_ERROR_HANDLING
    ) {
      if (error.response?.status === HTTP_PRECONDITION_FAILED) {
        createPreconditionFailedNotification(error.response.data as ApiError);
      } else {
        createErrorNotification(error.response.data as ApiError);
      }
    }
    return Promise.reject(error);
  }
);