ExchangeRates.ts

// refresh currency rates
export let refreshExchangeRates = functions
    .https
    .onRequest(async (request, response) => 
    {  
        await refreshExchangeRates(); 
        response.end(); 
    });

// functions to pull latest exchange rates and store them 
async function refreshExchangeRates()
{
    let allRates = await getAllCurrencyRates();
    let mappedRates = allRates.reduce((objs, rate) => { 
        objs[rate.currency] = rate.rate.toString();
        return objs;
     }, {});

    let db = admin.database();
    let date = moment().format('YYYYMMDD');
    let todayRef = db.ref('exchangeRatesToUsd/' + date)
    let latestRef = db.ref('exchangeRatesToUsd/latest');

    await todayRef.set(mappedRates);
    await latestRef.set(mappedRates);
}