How to use the appium-base-driver.errors.NoAlertOpenError function in appium-base-driver

commands.postDismissAlert = async function postDismissAlert (opts = {}) {
  try {
    let params = {};
    if (opts.buttonLabel) {
      params.name = opts.buttonLabel;
    }
    return await this.proxyCommand('/alert/dismiss', 'POST', params);
  } catch (err) {
    if (!this.isWebContext()) {
      throw new errors.NoAlertOpenError();
    }

    let alert = await this.getAlert();
    if (alert.close) {
      return await alert.close();
    }
    await alert.cancel();
  }
};

helpers.getAlert = async function getAlert () {
  const possibleAlert = await this.findNativeElementOrElements('class name',
    'XCUIElementTypeScrollView', true);
  if (possibleAlert.length !== 1) {
    throw new errors.NoAlertOpenError();
  }

  const possibleAlertButtons = await this.findNativeElementOrElements('class name',
    'XCUIElementTypeButton', true, util.unwrapElement(possibleAlert[0]));
  if (possibleAlertButtons.length < 1 || possibleAlertButtons.length > 2) {
    throw new errors.NoAlertOpenError();
  }

  const assertButtonName = async (button, expectedName) => {
    button = util.unwrapElement(button);
    const name = await this.proxyCommand(`/element/${button}/attribute/name`, 'GET');
    if (_.isNil(name) || name.toLowerCase() !== expectedName) {
      throw new errors.NoAlertOpenError();
    }
  };

commands.getAlertButtons = async function getAlertButtons () {
  try {
    return await this.proxyCommand('/wda/alert/buttons', 'GET');
  } catch (err) {
    throw new errors.NoAlertOpenError();
  }
};

commands.postAcceptAlert = async function postAcceptAlert (opts = {}) {
  try {
    let params = {};
    if (opts.buttonLabel) {
      params.name = opts.buttonLabel;
    }
    return await this.proxyCommand('/alert/accept', 'POST', params);
  } catch (err) {
    if (!this.isWebContext()) {
      throw new errors.NoAlertOpenError();
    }

    let alert = await this.getAlert();
    if (alert.close) {
      return await alert.close();
    }
    await alert.ok();
  }
};

function handleError (err) {
  if (err.message && err.message.match(/not open/)) {
    throw new errors.NoAlertOpenError();
  } else {
    throw err;
  }
}