Functional JS API Requests - Validating the API Response

validate-api-response.ts

const validateExchangeRates = (countryCode: CountryCode) => (
  response: ExchangeRates
): either.Either<Error, ExchangeRates> => {
  return response.base === countryCode
    ? either.right(response as ExchangeRates)
    : either.left(
        Error(
          `Invalid exchange rates data! Expected ${countryCode} but got ${response.base}`
        )
      );
};