const h2 = (await page.$eval('.gvTransactionHistoryHeader1', e => e.innerText.split('\t'))).join() + '\n';

	writeFileSync('payment.csv', (await page.$eval('.gvTransactionHistoryHeader1', e => e.innerText.split('\t'))).join() + '\n', {flag: 'wx'});

	let paymentStreams = new Map();

	const stream2 = createWriteStream("payment.csv", {flags: 'a'});

		let ym = shit2[i][0].substring(0, 7);
		if(!paymentStreams.has(ym)) {
			writeFileSync(`payment-${ym}.csv`, h2, {flag: 'wx'});
			paymentStreams.set(ym, createWriteStream(`payment-${ym}.csv`, {flags: 'a'}));
		}
		paymentStreams.get(ym).write(shit2[i].join() + '\n');

		stream2.write(shit2[i].join() + '\n');

	paymentStreams.forEach(s => s.end());

	stream2.end();

payment-*.csv

payment.csv