Firestore Emulator doesn't handle admin.firestore.FieldValue.increment on 9.2.0

[REQUIRED] Step 2: Describe your environment

• Operating System version: Windows
• Firebase SDK version: 9.2.0
• Firebase Product: Emulator
• Node.js version: 10.15.3
• NPM version: 6.4.1

[REQUIRED] Step 3: Describe the problem

I had a function that does doc.update({field: admin.firestore.FieldValue.increment(1)}), and a test to expect that field === 1. It was working fine when I was on ~8.0.0, but I tried to update to 9.2.0, this test started to fail.

    Expected: 1
    Received: undefined

I wonder if admin.firestore.FieldValue.increment is still properly handled in the emulator?

Steps to reproduce:

1. Write a cloud function and a test
2. Run test with it connected to emulator

Relevant Code:

Running test:

firebase emulators:exec --only firestore \"jest --config jest.config.js\"

Connecting to emulator:

const projectId = Math.random()
  .toString(36)
  .substring(7);
process.env.GCLOUD_PROJECT = projectId;
process.env.FIRESTORE_EMULATOR_HOST = "127.0.0.1:8080";
initializeApp({ projectId });

Code for function:

...

        await db.doc(`users/${USER_ID}`).update({
          // This field is undefined before
          field: admin.firestore.FieldValue.increment(1)
        });

...

Test:

  it("successfullly marks an item as purchased if it's made by the requester and increment counter", async () => {
    const wrapped = testEnv.wrap(functionName);
    const data = {};

    const res = await wrapped(data, {
      auth: { uid: USER_ID }
    });
    await expect(res).resolves;

    const userDoc = await db.doc(`users/${USER_ID}`).get();
    expect(userDoc .data()!["field"]).toBe(1);
  });

[BennetE]

For anyone who still has the problem and is looking for a solution. I found this answer that helped me:

https://github.com/firebase/firebase-admin-node/issues/1803#issuecomment-1179244087 https://stackoverflow.com/a/73047370/10433038

Do not use this:

import * as admin from "firebase-admin";

admin.firestore.FieldValue

use this:

import { FieldValue } from "firebase-admin/firestore";

[schmidt-sebastian]

@elvisun This issue is usually caused by using types from different versions of Firestore together. Can you verify that you only have a single version of @google-cloud/firestore (and ideally no version of @firebase/firestore) in your dependency tree?