firebase.database.ServerValue.TIMESTAMP ：数据库未定义

问题描述

几天过去了，我仍然不明白为什么 firebase.database 是 undefined。

chat.js 文件内容

const firebase = require('firebase');
require('firebase/database');

exports.sendMessage = (firebaseRtDb,uid,roomPath,message) => firebaseRtDb.ref(`${roomPath}/messages`).push().set({
  participant: uid,date: firebase.database.ServerValue.TIMESTAMP,message,});

chat.spec.js 摘录

const firebase = require('@firebase/testing');
const { sendMessage } = require('./chat');

const getRtDb = async (projectId,databaseName,auth) => {
  const app = firebase.initializeTestApp(
    {
      projectId,auth,},);
  const adminApp = firebase.initializeAdminApp({ databaseName });
  const adminDb = adminApp.database();
  await firebase
    .loadDatabaseRules({
      databaseName,rules: JSON.stringify(rules),});
  const db = app.database();

  return [db,adminDb];
};

let db = null;
let adminDb = null;
const myUid = 'lul';

beforeEach(async () => {
  const [rtDb,rtAdminDb] = await getRtDb('quickChat','quickChat',{ uid: myUid });
  db = rtDb;
  adminDb = rtAdminDb;
});

afterEach(async () => adminDb.ref('/').set(null));

it('Can write to chat',async () => {
  const roomPath = 'chatsRooms/room1';
  await adminDb.ref(roomPath).set({
    participants: {
      [myUid]: true,});
  return firebase.assertSucceeds(sendMessage(db,myUid,'lol'));
});

我尝试将 const firebase = require('firebase'); 替换为 onst firebase = require('firebase/app');，并使用和不使用 require('firebase/database');。

使用本文中的代码，我的 IDE 可以识别 firebase.database.ServerValue.TIMESTAMP。但是 Jest 测试失败了。 我使用 npx degit sveltejs/template my-svelte-project 启动了该项目。

玩笑输出

● Chat › Participants › Can write to chat

    TypeError: Cannot read property 'ServerValue' of undefined

      4 | exports.sendMessage = (firebaseRtDb,message) => firebaseRtDb.ref(`${roomPath}/messages`).push().set({
      5 |   participant: uid,> 6 |   date: firebase.database.ServerValue.TIMESTAMP,|                           ^
      7 |   message,8 | });
      9 | 

      at sendMessage (src/lib/chat.js:6:27)
      at Object.<anonymous> (src/lib/chat.spec.js:56:38)

package.json

{
  "name": "svelte-app","version": "1.0.0","scripts": {
    "build": "rollup -c","dev": "rollup -c -w","start": "sirv public","test": "jest --detectOpenHandles","test:watch": "jest --watchAll","test:ci": "jest --runInBand"
  },"devDependencies": {
    "@firebase/testing": "^0.20.11","@rollup/plugin-commonjs": "^16.0.0","@rollup/plugin-node-resolve": "^10.0.0","eslint": "^7.16.0","eslint-config-airbnb-base": "^14.2.1","eslint-plugin-import": "^2.22.1","eslint-plugin-jest": "^24.1.3","eslint-plugin-promise": "^4.2.1","jest": "^26.6.3","rollup": "^2.3.4","rollup-plugin-css-only": "^3.1.0","rollup-plugin-livereload": "^2.0.0","rollup-plugin-svelte": "^7.0.0","rollup-plugin-terser": "^7.0.0","svelte": "^3.0.0"
  },"dependencies": {
    "firebase": "^8.2.1","sirv-cli": "^1.0.0"
  }
}

编辑 1：忘记添加 getRtDb() 定义

解决方法

依赖 @firebase/testing 是原因。它已被弃用，我不得不将其替换为 @firebase/rules-unit-testing。

我也切换到 Typescript 并进行了如下导入：

chat.spec.ts

import * as firebase from '@firebase/rules-unit-testing';

import rules from '../../database.rules.json';
import { sendMessage } from './chat';

chat.ts

import firebase from 'firebase/app';
import 'firebase/database';