[Firestore] - FieldValue.arrayUnion broken on version 11.2.0

[abMarlim]

[REQUIRED] Step 2: Describe your environment

• Operating System version: macOS v12.6
• Firebase SDK version: 11.2.0
• Firebase Product: Firestore
• Node.js version: v16.16.0
• NPM version: 8.11.0

[REQUIRED] Step 3: Describe the problem

After updating firebase-admin from 10.3.0 to use the new COUNT() feature, I can no longer update a DOC with set() and FieldValue.arrayUnion, even though the property was in the Document previously.

Steps to reproduce:

In version 10.3.0 when I use the code below it works as expected.

await firestore.doc(`someCollection/someDocID`).set({
  date_updated: currentDateTime,
  date_updated_timestamp: currentDateTimeTimestamp,
  operations: admin.firestore.FieldValue.arrayUnion({
    type: operationType,
    operation_at: currentDateTime
  }),
  ...payload
}, { merge: true }).catch(e => {
  console.error(e);
  // throw error
});

In version 11.2.0 when I use the same code above, it returns an error, in the console and does not update the Document.

> operations: admin.firestore.FieldValue.arrayUnion({
> ^
>
> TypeError: Cannot read properties of undefined (reading 'arrayUnion')

Relevant Code:

// Initializing Firebase in CloudFunctions

const
  functions = require("firebase-functions"),
  admin = require('firebase-admin');

const IS_EMULATOR = ((typeof process.env.FUNCTIONS_EMULATOR === 'boolean' && process.env.FUNCTIONS_EMULATOR) || process.env.FUNCTIONS_EMULATOR === 'true');

admin.initializeApp();
let firestore = admin.firestore();

if (IS_EMULATOR) {
  firestore.settings({
    host: 'localhost',
    port: '8081',
    ssl: false
  })
}

I don't know if, between versions 10.3.0 and 11.2.0, the way to call the arrayUnion({}) function changed or if I'm doing something wrong, but since nothing was changed in the code, only the version, I understand that maybe the problem be on the new version, any input is welcome :)

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[abMarlim]

After looking at some other issues that other users were having with Firestore here in the repository and reading this comment from @lahirumaramba, it was enough minor modifications in the way to call the Firestore functions that the problem was solved. The big problem was the switch to modular SDK

To resolve:

1) Initialize Firebase in Cloud Functions

const
   { initializeApp } = require('firebase-admin/app'),
   { getFirestore } = require('firebase-admin/firestore');

const IS_EMULATOR = ((typeof process.env.FUNCTIONS_EMULATOR === 'boolean' && process.env.FUNCTIONS_EMULATOR) || process.env.FUNCTIONS_EMULATOR === 'true');

initializeApp();
let firestore = getFirestore();

if (IS_EMULATOR) {
   firestore.settings({
     host: 'localhost',
     port: '8081',
     ssl: false
   })
}

2) And when using the Firestore with arrayUnion update function

const
     { FieldValue } = require('firebase-admin/firestore');

await firestore.doc(`someCollection/someDocID`).set({
   date_updated: currentDateTime,
   date_updated_timestamp: currentDateTimeTimestamp,
   operations: FieldValue.arrayUnion({
     type: operationType,
     operation_at: currentDateTime
   }),
   ...payload
}, { merge: true }).catch(e => {
   console.error(e);
   // throw error
});