gateio swap watch many orderbooks

'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 loop(exchange, method, symbol) {
    while (true) {
        try {
            const orderbook = await exchange[method](symbol);
            console.log(exchange.iso8601(exchange.milliseconds()), orderbook['datetime'], orderbook['nonce'], symbol, orderbook['asks'][0], orderbook['bids'][0]);
        }
        catch (e) {
            console.log(e.constructor.name, e.message);
        }
    }
}
async function main() {
    const exchange = new ccxt.pro.gate({
        'options': { 'defaultType': 'swap' },
    });
    await exchange.loadMarkets();
    // exchange.verbose = true // uncomment for debugging purposes if necessary
    const symbols = [
        'ANC/USDT:USDT',
    ];
    await Promise.all(symbols.map((symbol) => loop(exchange, 'fetchOrderBook', symbol)));
}
main();