[firestore-emulator: datastore-mode] Namespace queries return empty array

[aalej]

[REQUIRED] Environment info

firebase-tools: v13.6.0

Platform: macOS Sonoma 14.4

node: v20.10.0

gcloud: v470.0.0

cloud-firestore-emulator: v1.19.4

[REQUIRED] Test case

MCVE - https://github.com/aalej/issues-6932

Alternatively, make a directory containing the ff files:

src/index.ts

```ts import { Datastore } from "@google-cloud/datastore"; const datastore = new Datastore({ projectId: "some-testproject", }); export async function getNamespaces() { const query = datastore.createQuery("__namespace__").select("__key__"); const [entities] = await datastore.runQuery(query); const namespaces = entities.map((entity) => entity[datastore.KEY].name); return namespaces; } export async function addEntity(namespace: string, kind: string[], data: any) { const entityKey = datastore.key({ path: kind, namespace, }); const entity = { key: entityKey, data, }; await datastore.save(entity); } async function main() { await addEntity("Tasks", ["Work Tasks"], { category: "Personal", done: false, priority: 4, description: "Learn Cloud Datastore", }); const namespaces = await getNamespaces(); console.log(namespaces); } main(); ```

tsconfig.json

```json { "compilerOptions": { "target": "es2016", "module": "commonjs", "esModuleInterop": true, "forceConsistentCasingInFileNames": true, "strict": true, "skipLibCheck": true, "outDir": "lib" }, "include": ["src"], "exclude": [] } ```

package.json

```json { "version": "1.0.0", "description": "", "main": "lib/index.js", "scripts": { "build": "tsc", "build:watch": "tsc --watch" }, "devDependencies": { "@google-cloud/datastore": "^8.6.0", "typescript": "^5.4.3" } } ```

[REQUIRED] Steps to reproduce

Testing while connected to the emulator

1. Run npm i
2. Run gcloud emulators firestore start --database-mode=datastore-mode --host-port=127.0.0.1:8081
3. On a separate terminal, run export DATASTORE_EMULATOR_HOST=127.0.0.1:8081
4. Run npm run build
5. Run node . or node lib/index.js

[REQUIRED] Expected behavior

Console logs should show the namespaces on Datastore emulator.

When connecting to production, console logs show the namespaces on Datastore:

[ 'Tasks' ]

Steps to test on a production environment:

1. Run unset DATASTORE_EMULATOR_HOST
2. Run export GOOGLE_APPLICATION_CREDENTIALS=<path_to_service_account_key.json>
3. Run npm run build
4. Run node . or node lib/index.js

[REQUIRED] Actual behavior

When connected to the emulator, console log outputs an empty array

[]

[OscarVanL]

We just upgraded from an old version of the cloud SDK emulators (from http://gcr.io/google.com/cloudsdktool/cloud-sdk:412.0.0-emulators to http://gcr.io/google.com/cloudsdktool/cloud-sdk:498.0.0-emulators).

After switching from running the emulator via gcloud beta emulators datastore start --use-firestore-in-datastore-mode to gcloud emulators firestore start --database-mode=datastore-mode all of our tests have broken as the old emulator supported namespaces.

It is a shame that the native firestore emulator seems to emulate firestore less completely than the datastore emulator. It would be great if this functionality was brought to parity.