text: const f = function() {}
  
  // Object.keys(require('@google-cloud/firestore'))
  module.exports = {
      setLogFunction: f,
      default: f,
      Firestore: f,
      GeoPoint: f,
      Transaction: f,
      WriteBatch: f,
      DocumentReference: f,
      WriteResult: f,
      DocumentSnapshot: f,
      QueryDocumentSnapshot: f,
      CollectionReference: f,
      QuerySnapshot: f,
      DocumentChange: f,
      Query: f,
      FieldValue: f,
      FieldPath: f,
      Timestamp: f,
  }
  