watch new trades only

'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 watchExchange(exchangeId, symbol) {
    const exchange = new ccxt.pro[exchangeId]({
        'newUpdates': true,
    });
    await exchange.loadMarkets();
    // exchange.verbose = true // uncomment for debugging purposes if necessary
    while (true) { // eslint-disable-line no-constant-condition
        try {
            const trades = await exchange.watchTrades(symbol);
            for (let i = 0; i < trades.length; i++) {
                const trade = trades[i];
                console.log(exchange.iso8601(exchange.milliseconds()), exchange.id, trade['symbol'], trade['id'], trade['datetime'], trade['price'], trade['amount']);
            }
        }
        catch (e) {
            console.log(symbol, e);
        }
    }
}
async function main() {
    const streams = {
        'binance': 'BTC/USDT',
        'okex': 'BTC/USDT',
        'kraken': 'BTC/USD',
    };
    const values = Object.entries(streams);
    const promises = values.map(([exchangeId, symbol]) => watchExchange(exchangeId, symbol));
    await Promise.all(promises);
}
main();