Adding Count to be accessible to the console.

Author: dannhauser

packages/firestore-compat/src/index.console.ts

@@ -17,12 +17,15 @@
 
 import { FirebaseAuthInternalName } from '@firebase/auth-interop-types';
 import { Provider } from '@firebase/component';
+import { Compat } from '@firebase/util';
 import {
   _DatabaseId,
   Firestore as FirestoreExp,
   FirestoreError,
   _EmptyAuthCredentialsProvider,
-  _EmptyAppCheckTokenProvider
+  _EmptyAppCheckTokenProvider,
+  Query as ExpQuery,
+  getCountFromServer
 } from '@firebase/firestore';
 
 import {
@@ -98,6 +101,17 @@ export class Firestore extends FirestoreCompat {
       new MemoryPersistenceProvider()
     );
   }
+
+  INTERNAL = {
+    delete: () => this.terminate(),
+    count: (query: Compat<ExpQuery<unknown>>) => {
+      return getCountFromServer(query._delegate)
+        .then(response => {
+          return response.data().count;
+        })
+        .catch(error => Promise.reject(error));
+    }
+  };
 }
 
 function databaseIdFromFirestoreDatabase(