Function getApiErrorMessage

src/utils/api-error-message.ts:13–31

(error: unknown, fallback: string)

 * then `fallback`.
 */
export function getApiErrorMessage(error: unknown, fallback: string): string {
  const body = axios.isAxiosError(error)
    ? error.response?.data
    : error instanceof Error && "response" in error
      ? (error as { response?: unknown }).response
      : undefined;

  if (body && typeof body === "object") {
    const { message, detail } = body as {
      message?: unknown;
      detail?: unknown;
    };
    if (typeof message === "string" && message) return message;
    if (typeof detail === "string" && detail) return detail;
  }

  if (error instanceof Error && error.message) return error.message;
  return fallback;
}