Many Exchanges Many Streams

'use strict';
import ccxt from '../../js/ccxt.js';
console.log('CCXT Version:', ccxt.version); // eslint-disable-line import/no-named-as-default-member
async function eachRun(exchangeId, symbol) {
   const exchange = new ccxt.pro[exchangeId]({ 'enableRateLimit': true }); // eslint-disable-line import/no-named-as-default-member
   while (true) { // eslint-disable-line no-constant-condition
       try {
           const orderbook = await exchange.watchOrderBook(symbol);
           console.log(new Date(), exchange.id, symbol, orderbook['asks'][0], orderbook['bids'][0]);
       }
       catch (e) {
           console.log(symbol, e);
       }
   }
}
async function main() {
   const streams = {
       'binance': 'BTC/USDT',
       'bittrex': 'BTC/USDT',
       'poloniex': 'BTC/USDT',
       'bitfinex': 'BTC/USDT',
       'hitbtc': 'BTC/USDT',
       'upbit': 'BTC/USDT',
       'coinbasepro': 'BTC/USD',
       'ftx': 'BTC/USDT',
       'okex': 'BTC/USDT',
       'gateio': 'BTC/USDT',
   };
   await Promise.all(Object.keys(streams).map((exchangeId) => eachRun(exchangeId, streams[exchangeId])));
}
main();