Typescript: Returned types from `firebaseTestEnvironment.authenticatedContext(...).firestore()` are incompatible with modular v9 client SDK Firestore types

[sceee]

[REQUIRED] Describe your environment

• Operating System version: Windows 10
• Browser version: N/A
• Firebase SDK version: 9.1.0
• Firebase Product: firestore

[REQUIRED] Describe the problem

In addition to the already fixed #5500, when using the modular v9 client SDK, the "Firestore" type returned by firebaseTestEnvironment.authenticatedContext(...).firestore() from @firebase/rules-unit-testing v2.0.1 is incompatible with the modular client SDK type "Firestore".

Steps to reproduce:

Compile the relevant code below using

• "@firebase/rules-unit-testing": "2.0.1",
• "firebase": "9.1.0",

Relevant Code:

import { initializeTestEnvironment, RulesTestEnvironment } from '@firebase/rules-unit-testing'
import { Firestore as ClientFirestore } from 'firebase/firestore'

let db: ClientFirestore
let firebaseTestEnvironment: RulesTestEnvironment

const rulesContent = fs.readFileSync(path.resolve(__dirname, '../../../firestore.rules'), 'utf8')
firebaseTestEnvironment = await initializeTestEnvironment({
      projectId: 'anyproj',
      firestore: {
        rules: rulesContent,
      },
    })

// This line fails to compile with "Type 'Firestore' is missing the following properties from type 'Firestore': type, toJSONts(2739)"
db = firebaseTestEnvironment.authenticatedContext('testuid', {}).firestore()

[Feiyang1]

This is working as intended. The testing SDK returns a compat version of Firestore for backward compatibility. It is not compatible with the modular Firestore type, but you can pass it to any function exported from the modular SDK where a modular Firestore is accepted, such as ref().

For typing db in the example, you should use the type exported from @firebase/firestore-types:

import { FirebaseFirestore as CompatFirestore } from `@firebase/firestore-types`;

let db: CompatFirestore;