// Web App
 {
  if(window.ReactNativeWebView) { // ensure window.ReactNativeWebView is there, otherwise, web app might crash if is not there
    window.ReactNativeWebView.postMessage('Wayne is coming again')
  }
}}>


// Native App
 {
    console.log(event.nativeEvent.data) // Client received data
  }}
  source={{ uri: 'https://your.domain.com' }}
/>