Currency conversion with Currency API

currency.ts

const COUNTRY_CURRENCY: { [key: string]: string } = {
  BJ: "XOF",
  BF: "XOF",
  CD: "CDF",
  CI: "XOF",
  CG: "XAF",
  CM: "XAF",
  GA: "XAF",
  GH: "GHS",
  GN: "GNF",
  KE: "KES",
  LR: "LRD",
  MG: "MGA",
  ML: "XOF",
  MW: "MWK",
  NE: "XOF",
  RW: "RWF",
  SN: "XOF",
  TG: "XOF",
  TZ: "TZS",
  UG: "UGX",
  ZM: "ZMW",
};

export function countryCurrency(country: string) {
  return COUNTRY_CURRENCY[country];
}

export async function amountInCurrency(amount: number, country: string) {
  const currency = countryCurrency(country);

  if (["XAF", "XOF"].includes(currency)) return amount;

  const lowercaseCurrency = currency.toLowerCase();
  const response = await fetch(
    `https://cdn.jsdelivr.net/gh/fawazahmed0/currency-api@1/latest/currencies/xof/${lowercaseCurrency}.json`,
    {
      method: "GET",
      headers: {
        "Content-Type": "application/json",
      },
    },
  );
  const data = await response.text();
  const json = JSON.parse(data);
  const exchangeRate = json[lowercaseCurrency];

  return Math.ceil(amount * exchangeRate * 1.02);
}

export function currencyFormatter(currency: string) {
  return new Intl.NumberFormat("fr-FR", {
    style: "currency",
    currency,
  });
}