export function getMessageFromUnknownError(
  err: unknown,
  fallback: string,
): string {
  if (typeof err === 'string') {
    return err;
  }
  if (err instanceof Error && typeof err.message === 'string') {
    return err.message;
  }
  return fallback;
}

export function getErrorFromUnknown(cause: unknown): Error {
  if (cause instanceof Error) {
    return cause;
  }
  const message = getMessageFromUnknownError(cause, 'Unknown error');
  return new Error(message);
}

export function getCauseFromUnknown(cause: unknown) {
  if (cause instanceof Error) {
    return cause;
  }

  return undefined;
}