deleteContent.js

// Delete A Comment or A Thread
const deleteContent = (collection, id) => {
  let toDelete = db.collection(collection).where(firebase.firestore.FieldPath.documentId(), '==', id);
  toDelete.get().then(snapshot => {
    snapshot.forEach(doc => {
      const data = doc.data();
      if (firebase.auth().currentUser.uid == data.user) {
        doc.ref.delete().then(() => {
          (collection == 'threads') ? getThreads() : setUpComments(data.thread);
        });
      }
    });
  });
}