How to use the @cityofzion/neon-core.rpc.IntegerParser function in @cityofzion/neon-core

const res = await rpc.Query.invokeScript(sb.str).execute(url);
  const tokenList = {} as { [symbol: string]: u.Fixed8 };
  if (
    !res ||
    !res.result ||
    !res.result.stack ||
    res.result.stack.length !== 3 * scriptHashArray.length
  ) {
    throw new Error("Stack returned was invalid");
  }
  try {
    for (let i = 0; i < res.result.stack.length; i += 3) {
      try {
        const symbol = rpc.StringParser(res.result.stack[i]);
        const decimals = rpc.IntegerParser(res.result.stack[i + 1]);
        tokenList[symbol] = rpc
          .Fixed8Parser(res.result.stack[i + 2])
          .mul(Math.pow(10, 8 - decimals));
      } catch (e) {
        log.error(`single call in getTokenBalances failed with : ${e.message}`);
        throw e;
      }
    }
    return tokenList;
  } catch (err) {
    log.error(`getTokenBalances failed with : ${err.message}`);
    throw err;
  }
}

export async function getTokenBalance(
  url: string,
  scriptHash: string,
  address: string
): Promise {
  const sb = new sc.ScriptBuilder();
  abi.decimals(scriptHash)(sb);
  abi.balanceOf(scriptHash, address)(sb);
  const script = sb.str;
  try {
    const res = await rpc.Query.invokeScript(script).execute(url);
    const decimals = rpc.IntegerParser(res.result.stack[0]);
    return rpc
      .Fixed8Parser(res.result.stack[1])
      .mul(Math.pow(10, 8 - decimals));
  } catch (err) {
    log.error(`getTokenBalance failed with : ${err.message}`);
    throw err;
  }
}

} else {
        sb.emitAppCall(scriptHash, "name")
          .emitAppCall(scriptHash, "symbol")
          .emitAppCall(scriptHash, "decimals")
          .emitAppCall(scriptHash, "totalSupply");
      }
    });

    const res = await rpc.Query.invokeScript(sb.str).execute(url);

    const result: TokenInfo[] = [];
    const step = address ? 5 : 4;
    for (let i = 0; i < res.result.stack.length; i += step) {
      const name = rpc.StringParser(res.result.stack[i]);
      const symbol = rpc.StringParser(res.result.stack[i + 1]);
      const decimals = rpc.IntegerParser(res.result.stack[i + 2]);
      const totalSupply = rpc
        .Fixed8Parser(res.result.stack[i + 3])
        .dividedBy(
          Math.pow(10, decimals - rpc.IntegerParser(res.result.stack[i + 2]))
        )
        .toNumber();
      const balance = address
        ? rpc
            .Fixed8Parser(res.result.stack[i + 4])
            .dividedBy(
              Math.pow(
                10,
                decimals - rpc.IntegerParser(res.result.stack[i + 2])
              )
            )
        : undefined;

const name = rpc.StringParser(res.result.stack[i]);
      const symbol = rpc.StringParser(res.result.stack[i + 1]);
      const decimals = rpc.IntegerParser(res.result.stack[i + 2]);
      const totalSupply = rpc
        .Fixed8Parser(res.result.stack[i + 3])
        .dividedBy(
          Math.pow(10, decimals - rpc.IntegerParser(res.result.stack[i + 2]))
        )
        .toNumber();
      const balance = address
        ? rpc
            .Fixed8Parser(res.result.stack[i + 4])
            .dividedBy(
              Math.pow(
                10,
                decimals - rpc.IntegerParser(res.result.stack[i + 2])
              )
            )
        : undefined;

      const obj = {
        name,
        symbol,
        decimals,
        totalSupply,
        balance
      };

      if (!obj.balance) {
        delete obj.balance;
      }