Binance FetchTicker Delivery Vs Future

// @NO_AUTO_TRANSPILE
import ccxt from '../../js/ccxt.js';
async function fetchTickers(exchange) {
    let tickers = undefined;
    try {
        // await exchange.loadMarkets () // optional
        tickers = await exchange.fetchTickers();
    }
    catch (e) {
        console.error(e.constructor.name, e.message);
    }
    return tickers;
}
(async () => {
    const future = new ccxt.binance({ options: { defaultType: 'future' } });
    const delivery = new ccxt.binance({ options: { defaultType: 'delivery' } });
    // ...
    const futureTickers = await fetchTickers(future);
    console.log(futureTickers);
    console.log('-------------------------------------------');
    const deliveryTickers = await fetchTickers(delivery);
    console.log(deliveryTickers);
})();