How to use the wampy.Wampy function in wampy

this.connectP = new Promise((resolve, reject) => {
                this.log("connecting...");
                let w3cws = require("websocket").w3cwebsocket;
                this.ws = new Wampy("ws://127.0.0.1:"+this.options.port+"/", {
                    ws: w3cws,
                    realm: this.options.realm||"nexus.example",
                    onConnect: () => {
                        this.log("connection - connect success");
                        resolve(this.ws);
                    },
                    onError: err => {
                        this.log("connection - error!");
                        reject(err);
                    },
                    onClose: () => {
                        this.log("connection - closed");
                    },
                    debug: false,
                    autoReconnect: true
                });

import { Wampy } from 'wampy'

const WAMP_NEAR_EXPLORER_URL = process.env.WAMP_NEAR_EXPLORER_URL || 'wss://near-explorer-wamp.onrender.com/ws'

const wamp = new Wampy(WAMP_NEAR_EXPLORER_URL, { realm: 'near-explorer' })

export async function getTransactions(accountId = '') {
    if (!this.accountId) return null
    if (!accountId) accountId = this.accountId

    const tx = await new Promise((resolve, reject) => wamp.call(
        'com.nearprotocol.testnet.explorer.select',
        [
            `
               SELECT 
                  transactions.hash,
                  transactions.signer_id, 
                  transactions.receiver_id, 
                  transactions.actions, 
                  transactions.block_hash, 
                  blocks.timestamp as blockTimestamp