react-native-firebase/lib/modules/admob/Banner.js

import React from 'react';
import AdMobComponent from './AdMobComponent';

function Banner({ ...props }) {
  return <AdMobComponent {...props} class="RNFirebaseAdMobBanner" />;
}

Banner.propTypes = AdMobComponent.propTypes;

Banner.defaultProps = {
  size: 'SMART_BANNER',
};

export default Banner;