Upgrade firebase-functions to v6 for firebase-admin v13 compatibility

firebase-admin v13.5.0+ (required for liveActivityToken) has a peer
dependency on firebase-functions v6.1.1+. firebase-functions v6 changes
the default export to v2 APIs, so index.js now imports from
firebase-functions/v1 to retain functions.config(), functions.region(),
and functions.runWith().

Test mocks updated to mock both firebase-functions and
firebase-functions/v1 paths.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: rwarner

functions/index.js

@@ -1,6 +1,8 @@
 'use strict';
 
-const functions = require('firebase-functions');
+// firebase-functions v6+ defaults to v2 APIs; use the v1 import to retain
+// functions.config(), functions.region(), and functions.runWith().
+const functions = require('firebase-functions/v1');
 const { initializeApp } = require('firebase-admin/app');
 
 // We need to initialize the app before importing modules that want Firestore.

functions/package.json

@@ -18,7 +18,7 @@
     "@valkey/valkey-glide": "^2.0.1",
     "fastify": "^5.7.3",
     "firebase-admin": "^13.5.0",
-    "firebase-functions": "^5.0.1"
+    "firebase-functions": "^6.1.1"
   },
   "devDependencies": {
     "@types/node": "^24.1.0",

functions/test/fcm-errors.test.js

@@ -40,6 +40,7 @@ const mockLogging = {
 };
 
 jest.mock('firebase-functions', () => mockFunctions);
+jest.mock('firebase-functions/v1', () => mockFunctions);
 jest.mock('@google-cloud/logging', () => ({
   Logging: jest.fn(() => mockLogging),
 }));

functions/test/handleRequest.test.js

@@ -48,6 +48,7 @@ const mockLogging = {
 };
 
 jest.mock('firebase-functions', () => mockFunctions);
+jest.mock('firebase-functions/v1', () => mockFunctions);
 jest.mock('@google-cloud/logging', () => ({
   Logging: jest.fn(() => mockLogging),
 }));

functions/test/ios.test.js

@@ -29,12 +29,14 @@ jest.mock('firebase-admin/firestore', () => ({
 jest.mock('firebase-admin/messaging', () => ({
   getMessaging: jest.fn(() => mockMessaging),
 }));
-jest.mock('firebase-functions', () => ({
+const mockFunctions = {
   config: jest.fn(() => ({})),
   region: jest.fn().mockReturnThis(),
   runWith: jest.fn().mockReturnThis(),
   https: { onRequest: jest.fn() },
-}));
+};
+jest.mock('firebase-functions', () => mockFunctions);
+jest.mock('firebase-functions/v1', () => mockFunctions);
 
 const { handleRequest } = require('../index.js');
 const ios = require('../ios');

functions/test/rate-limiter/firestore-rate-limiter.test.js

@@ -34,11 +34,13 @@ jest.mock('firebase-admin/firestore', () => ({
   Timestamp: mockTimestamp,
 }));
 
-jest.mock('firebase-functions', () => ({
+const mockFunctionsLogger = {
   logger: {
     info: jest.fn(),
   },
-}));
+};
+jest.mock('firebase-functions', () => mockFunctionsLogger);
+jest.mock('firebase-functions/v1', () => mockFunctionsLogger);
 
 const FirestoreRateLimiter = require('../../rate-limiter/firestore-rate-limiter');
 

functions/test/utils/firebase-mocks.js

@@ -38,8 +38,9 @@ const setupFirebaseMocks = () => {
     fromDate: jest.fn((date) => ({ toDate: () => date })),
   };
 
-  // Set up Jest mocks
+  // Set up Jest mocks — mock both paths since index.js uses firebase-functions/v1
   jest.mock('firebase-functions', () => mockFunctions);
+  jest.mock('firebase-functions/v1', () => mockFunctions);
   jest.mock('@google-cloud/logging', () => ({
     Logging: jest.fn(() => mockLogging),
   }));