How to use the @walletconnect/qrcode-modal.open function in @walletconnect/qrcode-modal

const connect = async (): Promise => {
  // Check if connection is already established
  if (!walletConnector.connected) {
    createConnector();
    // create new session
    await walletConnector.createSession();
    // get uri for QR Code modal
    const uri = walletConnector.uri;
    // display QR Code modal
    WalletConnectQRCodeModal.open(uri, () => {
      console.log('QR Code Modal closed');
    });

    subscribe();
  } else {
    await walletConnector.killSession();
  }
};

await this.setState({ walletConnector });

    // check if already connected
    if (!walletConnector.connected) {
      // create new session
      await walletConnector.createSession();

      // get uri for QR Code modal
      const uri = walletConnector.uri;

      // console log the uri for development
      console.log(uri); // tslint:disable-line

      // display QR Code modal
      WalletConnectQRCodeModal.open(uri, () => {
        console.log("QR Code Modal closed"); // tslint:disable-line
      });
    }
    // subscribe to events
    await this.subscribeToEvents();
  };
  public subscribeToEvents = () => {

switchMap(() => {
          const result = new Subject();
          const uri = this.connector.uri;
          console.log(uri);
          let ignoreClose = false;
          // display QR Code modal
          WalletConnectQRCodeModal.open(uri, () => {
            if (!ignoreClose) {
              result.error(Errors.REJECTED_BY_USER);
            }
          });
          // hack to make QR code window above ng-bootstrap windows
          document.getElementById("walletconnect-qrcode-modal").style.zIndex =
            "9999999999";
          this.connector.on("connect", (error, payload) => {
            if (error) {
              result.error(error);
            }

            ignoreClose = true;

            // Close QR Code Modal
            WalletConnectQRCodeModal.close();

.then(() => {
            if (this.qrcode) {
              WalletConnectQRCodeModal.open(wc.uri, () => {
                reject(new Error('User closed WalletConnect modal'))
              })
            }
            wc.on('connect', (error, payload) => {
              if (this.qrcode) {
                WalletConnectQRCodeModal.close()
              }
              if (error) {
                this.isConnecting = false
                return reject(error)
              }
              this.isConnecting = false
              this.connected = true

              if (payload) {
                // Handle session update

public openQRCode () {
    const uri = this.wc ? this.wc.uri : ''
    if (uri) {
      WCQRCode.open(uri, () => {
        this.emit('error', new Error('User close WalletConnect QR Code modal'))
      })
    }
  }
  public create () {

public openQRCode () {
    const uri = this.wc ? this.wc.uri : ''
    if (uri) {
      WCQRCode.open(uri, () => {
        this.emit('error', new Error('User close WalletConnect QR Code modal'))
      })
    }
  }
  public create () {

openQR () {
    const uri = this.wc ? this.wc.uri : ''
    if (uri) {
      WCQRCode.open(uri, () => {
        this.emit('error', new Error('User close WalletConnect QR Code modal'))
      })
    }
  }
  create () {