Instantiate All At Once

// @NO_AUTO_TRANSPILE
import ccxt from '../../js/ccxt.js';
async function test() {
    let exchanges = {
        "binance": {
            "apiKey": "YOUR_API_KEY",
            "secret": "YOUR_SECRET",
        },
        "bitfinex": {
            "apiKey": "YOUR_API_KEY",
            "secret": "YOUR_SECRET"
        },
    };
    let ids = ccxt.exchanges.filter(id => id in exchanges);
    await Promise.all(ids.map(async (id) => {
        console.log(exchanges[id]);
        // instantiate the exchange
        let exchange = new ccxt[id](exchanges[id]);
        console.log(exchange.id, exchange.apiKey);
        exchanges[id] = exchange;
        // load markets
        await exchange.loadMarkets();
        console.log(exchange.id, 'loaded');
        // check the balance
        if (exchange.apiKey) {
            let balance = await exchange.fetchBalance();
            console.log(exchange.id, balance);
        }
        return exchange;
    }));
    // when all of them are ready, do your other things
    console.log('Loaded exchanges:', ids.join(', '));
}
test();