firebase-admin is Node.js / Server SDK, while @firebase/testing is a Web / Client SDK. If you mix the API and Data Type (Timestamp) from these libraries, you will get
Unhandled error Error [FirebaseError]: Function DocumentReference.set() called with invalid data. Unsupported field value: a custom object (found in field created)In the following example, we use @firebase/testing API with a firebase-functions Timestamp data type, thus causing the above exception.
const functions = require('firebase-functions');const projectId = 'PROJECT_NAME'// testing with firebase emulatorconst firebase = require('@firebase/testing')const db = firebase.initializeTestApp({ projectId: projectId }).firestore()const admin = require('firebase-admin')/*admin.initializeApp(functions.config().firebase)const db = admin.firestore()*/exports.requestInvite = functions.https.onCall(async (data, context) => { const email = data.email // use email as docId const docId = Buffer.from(email).toString('base64') const docRef = db.collection('request_invite').doc(docId) await docRef.set({ // SHOULD use firebase.firestore.Timestamp.now() instead since the db(API) is from @firebase/testing created: admin.firestore.Timestamp.now(), email: email }) return { text: `Hello ${email}!`, docId: docRef.id }})To solve this we would use matching API and Data Type
Use @firebase/testing
const projectId = 'PROJECT_NAME'// testing with firebase emulatorconst firebase = require('@firebase/testing')const db = firebase.initializeTestApp({ projectId: projectId }).firestore()const firestore = firebase.firestore...await docRef.set({ created: firebase.firestore.Timestamp.now(), email: email})or
Use firebase-admin
const admin = require('firebase-admin')admin.initializeApp(functions.config().firebase)const db = admin.firestore()...await docRef.set({ created: admin.firestore.Timestamp.now(), email: email})