/**
 * @license
 * Copyright 2018 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import firebase from 'firebase';

export enum ListenEvent {
  added = 'child_added',
  removed = 'child_removed',
  changed = 'child_changed',
  moved = 'child_moved',
  value = 'value'
}

export interface QueryChange {
  snapshot: firebase.database.DataSnapshot;
  prevKey: string | null | undefined;
  event: ListenEvent;
}