How to use the ccxt._1btcxe function in ccxt

import { AuthenticatedExchangeAPI, Balances } from '../AuthenticatedExchangeAPI';
import { CryptoAddress, ExchangeTransferAPI, TransferRequest, TransferResult, WithdrawalRequest } from '../ExchangeTransferAPI';
import { ExchangeAuthConfig } from '../AuthConfig';
import { Side } from '../../lib/sides';
import { Big, BigJS, ZERO } from '../../lib/types';
import { BookBuilder } from '../../lib/BookBuilder';
import { PlaceOrderMessage, TradeMessage } from '../../core/Messages';
import { Level3Order, LiveOrder } from '../../lib/Orderbook';
import { Logger } from '../../utils/Logger';
import { CBPTTError, HTTPError } from '../../lib/errors';

type ExchangeDefinition = [string, new (opts: any) => ccxt.Exchange];
// Supported exchanges, minus those with native support
const exchanges: { [index: string]: ExchangeDefinition } = {
    _1broker: ['1Broker', ccxt._1broker],
    _1btcxe: ['1BTCXE', ccxt._1btcxe],
    acx: ['ACX', ccxt.acx],
    allcoin: ['Allcoin', ccxt.allcoin],
    anxpro: ['ANXPro', ccxt.anxpro],
    bibox: ['Bibox', ccxt.bibox],
    binance: ['Binance', ccxt.binance],
    bit2c: ['Bit2C', ccxt.bit2c],
    bitbank: ['bitbank', ccxt.bitbank],
    bitbay: ['BitBay', ccxt.bitbay],
    bitfinex: ['Bitfinex', ccxt.bitfinex],
    bitfinex2: ['Bitfinex', ccxt.bitfinex2],
    bitflyer: ['bitFlyer', ccxt.bitflyer],
    bithumb: ['Bithumb', ccxt.bithumb],
    bitlish: ['Bitlish', ccxt.bitlish],
    bitmarket: ['BitMarket', ccxt.bitmarket],
    bitmex: ['BitMEX', ccxt.bitmex],
    bitso: ['Bitso', ccxt.bitso],