firebase.database.ServerValue.TIMESTAMP : database is undefined - firebase

Question

It's been days and I still can't figure out why firebase.database is undefined.
chat.js file content
const firebase = require('firebase');
require('firebase/database');
exports.sendMessage = (firebaseRtDb, uid, roomPath, message) => firebaseRtDb.ref(`${roomPath}/messages`).push().set({
participant: uid,
date: firebase.database.ServerValue.TIMESTAMP,
message,
});
chat.spec.js extract
const firebase = require('#firebase/testing');
const { sendMessage } = require('./chat');
const getRtDb = async (projectId, databaseName, auth) => {
const app = firebase.initializeTestApp(
{
projectId,
databaseName,
auth,
},
);
const adminApp = firebase.initializeAdminApp({ databaseName });
const adminDb = adminApp.database();
await firebase
.loadDatabaseRules({
databaseName,
rules: JSON.stringify(rules),
});
const db = app.database();
return [db, adminDb];
};
let db = null;
let adminDb = null;
const myUid = 'lul';
beforeEach(async () => {
const [rtDb, rtAdminDb] = await getRtDb('quickChat', 'quickChat', { uid: myUid });
db = rtDb;
adminDb = rtAdminDb;
});
afterEach(async () => adminDb.ref('/').set(null));
it('Can write to chat', async () => {
const roomPath = 'chatsRooms/room1';
await adminDb.ref(roomPath).set({
participants: {
[myUid]: true,
},
});
return firebase.assertSucceeds(sendMessage(db, myUid, roomPath, 'lol'));
});
I tried replacing const firebase = require('firebase'); by onst firebase = require('firebase/app'); and with and without require('firebase/database');.
With code as is in this post, my IDE recognise firebase.database.ServerValue.TIMESTAMP. But Jest test fails.
I started the project using npx degit sveltejs/template my-svelte-project.
Jest output
● Chat › Participants › Can write to chat
TypeError: Cannot read property 'ServerValue' of undefined
4 | exports.sendMessage = (firebaseRtDb, uid, roomPath, message) => firebaseRtDb.ref(`${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"
}
}
EDIT 1 : forgot to add getRtDb() definition

Answer 1

The dependency #firebase/testing was the cause. It is deprecated and I had to replace it by #firebase/rules-unit-testing.
I also switched to Typescript and made the import as follow:
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';