App.tsx

  const comet = useMemo(() => new Contract(networkConfig.rootsV3.comet, Comet, signer), [signer]);

  useAsyncEffect(async () => {
    const decimals = +(await comet.callStatic.decimals()).toString();
    const borrowBalance = +(await comet.callStatic.borrowBalanceOf(account)).toString();
    setBorrowBalance(borrowBalance / Math.pow(10, decimals));
  }, []);