Get total issued debt at some specific block

totalIssuedSynths.js

const { SynthetixJs } = require('synthetix-js');

const snxjs = new SynthetixJs();

(async () => {
	const provider = snxjs.ethers.getDefaultProvider();
	const currentBlock = await provider.getBlockNumber();

	const totalDebtInSystemAtBlock = await snxjs.Synthetix.contract.totalIssuedSynths(
		snxjs.utils.toUtf8Bytes4('sUSD'),
		{ blockTag: currentBlock }
	);

	console.log(snxjs.utils.formatEther(totalDebtInSystemAtBlock));
})();