Image.jsx

import React from "react";
import firebase from "../firebase.js";

const FiebasePromise = props => firebase
   .storage()
   .ref()
   .child("images/" + props.imageName)
   .getDownloadURL()
};
      
// And it would be used like this:
const Example = props => (
   <FiebasePromise imageName={'IdunnoWhatever.jpg'}>
    {(url) => <p>The url is {url}</p>}
    </FirebasePromise>
)