How to use the got.RequestError function in got

function errorHandler(error, send, localize, type, prefix) {
	if (error instanceof got.CacheError) {
		send(safeLocal(localize, prefix, "cache_error", type));
	} else if (error instanceof got.RequestError) {
		send(safeLocal(localize, prefix, "request_error", type));
	} else if (error instanceof got.ReadError) {
		send(safeLocal(localize, prefix, "read_error", type));
	} else if (error instanceof got.ParseError) {
		send(safeLocal(localize, prefix, "parse_error", type));
	} else if (error instanceof got.HTTPError) {
		if (error.statusCode.startsWith("4")) {
			send(safeLocal(localize, prefix, "4xx_error", type, error.statusCode));
		} else if (error.statusCode.startsWith("5")) {
			send(safeLocal(localize, prefix, "5xx_error", type, error.statusCode));
		} else {
			send(safeLocal(localize, prefix, "http_error", type, error.statusCode));
		}
	} else if (error instanceof got.MaxRedirectsError) {
		send(safeLocal(localize, prefix, "redirect_error", type));
	} else if (error instanceof got.UnsupportedProtocolError) {

err => {
        const { response } = err;

        if (err instanceof got.HTTPError) {
          if (err.statusCode === 404) {
            return new errors.NotFoundError(err.url);
          }
          return new errors.HTTPError(err.statusCode, err.statusMessage, err.url);
        } else if (err instanceof got.RequestError) {
          if (err.code === 'ETIMEDOUT') {
            return new errors.TimeoutError(err.message, err.url);
          }
          return new errors.RequestError(err.url);
        }

        return new errors.PoketoError('ERROR', err.message);
      },
    ],