Binance FetchTicker Delivery Vs Future

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)

}) ()