Gdax Fetch Trades Pagination

import ccxt from '../../js/ccxt.js';
import ololog from 'ololog';

const { noLocate } = ololog;
const log = noLocate;

const exchange = new ccxt.coinbasepro ()

;(async () => {

   const symbol = 'ETH/BTC'
   const params = {}
   await exchange.loadMarkets ()
   while (true) {
       const trades = await exchange.fetchTrades (symbol, undefined, undefined, params)
       if (trades.length) {
           const firstTrade = trades[0]
           const lastTrade = trades[trades.length - 1]
           log.yellow ('Fetched', trades.length, symbol, 'trades from', firstTrade['datetime'], 'to', lastTrade['datetime'])
           if ('Cb-After' in exchange.last_response_headers) {
               params['after'] = exchange.last_response_headers['Cb-After'];
           }
       } else {
           log.green ('Done.')
           break;
       }
   }

}) ()