withDeepLink.js

import {Platform, Linking} from 'react-native'
import firebase from 'react-native-firebase'

firebase.links()
    .getInitialLink()
    .then((url) => {
        if (url) {
            // app opened from a dynamic link URL
        } else {
           // use deep link to handle the URL.
          if (Platform.OS === 'android') {
            Linking.getInitialURL()
              .then((url) => {
                 // do something with the URL
              })
              .catch(err => err);
          } else {
            // handle case for iOS 
          }
        }
    });