title: Firestore FieldValue is always undefined
body: <p>I am always getting an error from the FieldValue method that it is undefined. Anybody any ideas? I am using react...</p>
  <pre><code>   function incrementLikes() {
      firebase.db
        .collection('projects')
        .doc(data.id)
        .update({ likes: firebase.firestore.FieldValue.increment(1) });
    }
  
  
  &lt;LikeButton likesCount={data.likes} onClick={incrementLikes} /&gt;
  </code></pre>