How to use the appium-remote-debugger.WebKitRemoteDebugger function in appium-remote-debugger

useUrl = useUrl && !!this.getCurrentUrl();
  logger.debug(`Selecting by url: ${useUrl} ${useUrl ? `(expected url: '${this.getCurrentUrl()}')` : ''}`);

  let currentUrl = useUrl ? this.getCurrentUrl() : undefined;
  let pageArray;
  if (this.isRealDevice() && this.remote && this.opts.bundleId) {
    // real device, and already connected
    pageArray = await this.remote.pageArrayFromJson(this.opts.ignoreAboutBlankUrl);
  } else if (this.remote && this.remote.appIdKey) {
    // simulator, and already connected
    pageArray = await this.remote.selectApp(currentUrl, this.opts.webviewConnectRetries, this.opts.ignoreAboutBlankUrl);
  } else if (this.isRealDevice()) {
    // real device, and not connected
    try {
      this.remote = new WebKitRemoteDebugger({
        port: this.opts.webkitDebugProxyPort,
        webkitResponseTimeout: this.opts.webkitResponseTimeout,
        platformVersion: this.opts.platformVersion,
        isSafari: this.isSafari(),
        garbageCollectOnExecute: false,
        logFullResponse: !!this.opts.safariShowFullResponse,
      });
      pageArray = await this.remote.pageArrayFromJson(this.opts.ignoreAboutBlankUrl);
    } catch (err) {
      // it is reasonable to expect that this might be called when there is no
      // webkit remote debugger to connect to
      if (!_.includes(err.message, 'connect ECONNREFUSED')) throw err; // eslint-disable-line curly

      logger.warn('Attempted to get a list of webview contexts but could not connect to ' +
                  'ios-webkit-debug-proxy. If you expect to find webviews, please ensure ' +
                  'that the proxy is running and accessible');