htx open close contract

// @NO_AUTO_TRANSPILE
import ccxt from '../../js/ccxt.js';
const exchange = new ccxt.htx({
    'apiKey': 'YOUR_API_KEY',
    'secret': 'YOUR_SECRET',
    'options': {
        'defaultType': 'swap',
        'marginMode': 'cross'
    },
});
(async () => {
    const markets = await exchange.loadMarkets();
    // exchange.verbose = true // uncomment for debugging purposes if necessary
    // Example: creating and closing a contract
    let symbol = 'ADA/USDT:USDT'; // market positions for contracts not available
    let type = 'limit';
    let side = 'buy';
    let offset = 'open';
    let leverage = 1;
    let amount = 1;
    let price = 1;
    let clientOrderId = 6;
    let params = {
        'offset': offset,
        'lever_rate': leverage,
        'client_order_id': clientOrderId
    };
    try {
        // fetching current balance
        const balance = await exchange.fetchBalance();
        console.log(balance);
        // placing an order
        const order = await exchange.createOrder(symbol, type, side, amount, price, params);
        console.log(order);
        // fetching position
        const position = await exchange.fetchPosition(symbol);
        console.log(position);
        // closing it by issuing an oposite contract 
        // warning: since we can only place limit orders
        // it might take a while (depending on the price we choose and market fluctuations) 
        // to the order be fulfilled
        // and therefore close our previous position
        side = 'sell';
        type = 'limit';
        offset = 'close';
        const reduce_only = 1; // 1 : yes, 0: no
        clientOrderId = 9;
        price = 1.147; // adjust this accordingly
        params = { 'offset': offset, 'reduce_only': reduce_only, 'client_order_id': clientOrderId };
        const opositeOrder = await exchange.createOrder(symbol, type, side, amount, price, params);
        console.log(opositeOrder);
    }
    catch (e) {
        console.log(e.constructor.name, e.message);
    }
})();