fix: Support json format in Firebase options for web for firebase CLI >=13.31.0

packages/flutterfire_cli/lib/src/firebase/firebase_dart_options.dart

@@ -65,9 +65,15 @@ extension FirebaseDartOptions on FirebaseOptions {
     var jsonBody = '';
     if (match != null) {
       jsonBody = match.namedGroup('jsonBody')!;
+      return FirebaseOptions.fromMap(
+        const JsonDecoder().convert('{$jsonBody}') as Map,
+      );
+    } else {
+      // Handle new JSON format introduced in Firebase CLI v13.31.0
+      // The config is now returned as direct JSON instead of JavaScript format
+      return FirebaseOptions.fromMap(
+        const JsonDecoder().convert(appSdkConfig.fileContents) as Map,
+      );
     }
-    return FirebaseOptions.fromMap(
-      const JsonDecoder().convert('{$jsonBody}') as Map,
-    );
   }
 }

packages/flutterfire_cli/test/firebase_dart_options_test.dart

@@ -0,0 +1,76 @@
+import 'package:flutterfire_cli/src/firebase.dart';
+import 'package:flutterfire_cli/src/firebase/firebase_dart_options.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('FirebaseDartOptions', () {
+    group('convertConfigToOptions', () {
+      test('parses traditional JavaScript format correctly', () {
+        final config = FirebaseAppSdkConfig(
+          fileName: 'firebase-config.js',
+          fileContents: '''
+firebase.initializeApp({
+  "projectId": "test-project",
+  "appId": "1:1234567890:web:abcdef1234567890",
+  "apiKey": "test-api-key",
+  "authDomain": "test-project.firebaseapp.com",
+  "messagingSenderId": "1234567890",
+  "measurementId": "G-ABCDEF1234"
+});''',
+        );
+
+        final options = FirebaseDartOptions.convertConfigToOptions(
+          config,
+          'test-project',
+        );
+
+        expect(options.projectId, 'test-project');
+        expect(options.appId, '1:1234567890:web:abcdef1234567890');
+        expect(options.apiKey, 'test-api-key');
+        expect(options.messagingSenderId, '1234567890');
+        expect(options.measurementId, 'G-ABCDEF1234');
+      });
+
+      test('parses new JSON format correctly', () {
+        final config = FirebaseAppSdkConfig(
+          fileName: 'firebase-config.json',
+          fileContents: '''
+{
+  "projectId": "test-project",
+  "appId": "1:1234567890:web:abcdef1234567890",
+  "apiKey": "test-api-key",
+  "authDomain": "test-project.firebaseapp.com",
+  "messagingSenderId": "1234567890",
+  "measurementId": "G-ABCDEF1234"
+}''',
+        );
+
+        final options = FirebaseDartOptions.convertConfigToOptions(
+          config,
+          'test-project',
+        );
+
+        expect(options.projectId, 'test-project');
+        expect(options.appId, '1:1234567890:web:abcdef1234567890');
+        expect(options.apiKey, 'test-api-key');
+        expect(options.messagingSenderId, '1234567890');
+        expect(options.measurementId, 'G-ABCDEF1234');
+      });
+
+      test('throws FirebaseCommandException for invalid format', () {
+        final config = FirebaseAppSdkConfig(
+          fileName: 'invalid-config.txt',
+          fileContents: 'Invalid config format',
+        );
+
+        expect(
+          () => FirebaseDartOptions.convertConfigToOptions(
+            config,
+            'test-project',
+          ),
+          throwsA(isA<Exception>()),
+        );
+      });
+    });
+  });
+}