fix: 'Null' is not a subtype of type 'String' in type cast on Linux (#405)

Co-authored-by: Russell Wheatley <russellwheatley85@gmail.com>

Author: stMerlHin

packages/flutterfire_cli/lib/src/firebase.dart

@@ -50,7 +50,7 @@ Future<String?> getDefaultFirebaseProjectId() async {
   final fileContents = firebaseRcFile.readAsStringSync();
   try {
     final jsonMap =
-        const JsonDecoder().convert(fileContents) as Map<String, dynamic>;
+    const JsonDecoder().convert(fileContents) as Map<String, dynamic>;
     if (jsonMap['projects'] != null &&
         (jsonMap['projects'] as Map)['default'] != null) {
       return (jsonMap['projects'] as Map)['default'] as String;
@@ -67,11 +67,11 @@ Future<String?> getDefaultFirebaseProjectId() async {
 ///   final result = await runFirebaseCommand(['projects:list']);
 ///   print(result);
 Future<Map<String, dynamic>> runFirebaseCommand(
-  List<String> commandAndArgs, {
-  String? project,
-  String? account,
-  String? serviceAccount,
-}) async {
+    List<String> commandAndArgs, {
+      String? project,
+      String? account,
+      String? serviceAccount,
+    }) async {
   final cliExists = await exists();
   if (!cliExists) {
     throw FirebaseCommandException(
@@ -116,7 +116,7 @@ Future<Map<String, dynamic>> runFirebaseCommand(
     if (jsonString.length > characterLimit) {
       // If the JSON string is large, write it to a temporary file
       final tempFile =
-          File('${Directory.systemTemp.path}/firebase_output.json');
+      File('${Directory.systemTemp.path}/firebase_output.json');
       await tempFile.writeAsString(jsonString);
 
       // Read from the temporary file to create a Dart object
@@ -141,14 +141,14 @@ Future<Map<String, dynamic>> runFirebaseCommand(
     rethrow;
   }
 
-  if (process.exitCode > 0 || commandResult['status'] == 'error') {
-    throw FirebaseCommandException(
-      execArgs.join(' '),
-      commandResult['error'] as String,
-    );
+  if (commandResult['status'] == 'success') {
+    return commandResult;
   }
 
-  return commandResult;
+  throw FirebaseCommandException(
+    execArgs.join(' '),
+    commandResult['error'] as String,
+  );
 }
 
 /// Get all available Firebase projects for the authenticated CLI user
@@ -171,8 +171,8 @@ Future<List<FirebaseProject>> getProjects({
     return result
         .map<FirebaseProject>(
           (Map<String, dynamic> e) =>
-              FirebaseProject.fromJson(Map<String, dynamic>.from(e)),
-        )
+          FirebaseProject.fromJson(Map<String, dynamic>.from(e)),
+    )
         .where((project) => project.state == 'ACTIVE')
         .toList();
   } catch (e) {
@@ -231,8 +231,8 @@ Future<List<FirebaseApp>> getApps({
   return result
       .map<FirebaseApp>(
         (Map<String, dynamic> e) =>
-            FirebaseApp.fromJson(Map<String, dynamic>.from(e)),
-      )
+        FirebaseApp.fromJson(Map<String, dynamic>.from(e)),
+  )
       .toList();
 }
 
@@ -300,7 +300,7 @@ Future<FirebaseApp> findOrCreateFirebaseApp({
 
   _assertFirebaseSupportedPlatform(platformFirebase);
   final fetchingAppsSpinner = spinner(
-    (done) {
+        (done) {
       final loggingAppName =
           packageNameOrBundleIdentifier ?? webAppId ?? displayNameWithPlatform;
       if (!done) {
@@ -333,7 +333,7 @@ Future<FirebaseApp> findOrCreateFirebaseApp({
       final flagOption = platform == kWeb ? kWebAppIdFlag : kWindowsAppIdFlag;
       // Find provided web app id for web and windows, otherwise, throw Exception that it doesn't exist
       final webApp = unfilteredFirebaseApps.firstWhere(
-        (firebaseApp) => firebaseApp.appId == webAppId,
+            (firebaseApp) => firebaseApp.appId == webAppId,
         orElse: () {
           fetchingAppsSpinner.done();
           throw Exception(
@@ -347,7 +347,7 @@ Future<FirebaseApp> findOrCreateFirebaseApp({
     }
     // Find web app for web and windows using display name with this signature: "flutter_app_name (platform)
     filteredFirebaseApps = unfilteredFirebaseApps.where(
-      (firebaseApp) {
+          (firebaseApp) {
         if (firebaseApp.displayName == displayNameWithPlatform) {
           return true;
         }
@@ -357,17 +357,17 @@ Future<FirebaseApp> findOrCreateFirebaseApp({
     // Find any for that platform if no web app found with display name
     if (filteredFirebaseApps.isEmpty) {
       filteredFirebaseApps = unfilteredFirebaseApps.where(
-        (firebaseApp) {
+            (firebaseApp) {
           return firebaseApp.platform == platform;
         },
       );
     }
   } else {
     filteredFirebaseApps = unfilteredFirebaseApps.where(
-      (firebaseApp) {
+          (firebaseApp) {
         if (packageNameOrBundleIdentifier != null) {
           return firebaseApp.packageNameOrBundleIdentifier ==
-                  packageNameOrBundleIdentifier &&
+              packageNameOrBundleIdentifier &&
               firebaseApp.platform == platformFirebase;
         }
         return false;
@@ -405,7 +405,7 @@ Future<FirebaseApp> findOrCreateFirebaseApp({
       );
       break;
     case kWeb:
-      // This is used to also create windows app, Firebase has no concept of a windows app
+    // This is used to also create windows app, Firebase has no concept of a windows app
       createFirebaseAppFuture = createWebApp(
         project: project,
         displayName: displayNameWithPlatform,
@@ -419,7 +419,7 @@ Future<FirebaseApp> findOrCreateFirebaseApp({
   }
 
   final creatingAppSpinner = spinner(
-    (done) {
+        (done) {
       if (!done) {
         return AnsiStyles.bold(
           'Registering new Firebase ${AnsiStyles.cyan(platform)} app on Firebase project ${AnsiStyles.cyan(project)}.',
@@ -519,7 +519,7 @@ Future<String> getAccessToken() async {
       : Platform.environment['HOME']!;
   // Path to 'firebase-tools.json'
   final configPath =
-      path.join(homeDir, '.config', 'configstore', 'firebase-tools.json');
+  path.join(homeDir, '.config', 'configstore', 'firebase-tools.json');
   final configFile = File(configPath);
   if (!configFile.existsSync()) {
     throw Exception(
@@ -536,7 +536,7 @@ Future<String> getAccessToken() async {
     headers: {'Content-Type': 'application/x-www-form-urlencoded'},
     // Values for obtaining the access token are taken from the Firebase CLI source code: https://github.com/firebase/firebase-tools/blob/b14b5f38fe23da6543778a588811b0e2391427c0/src/api.ts#L18
     body:
-        'grant_type=refresh_token&client_id=563584335869-fgrhgmd47bqnekij5i8b5pr03ho849e6.apps.googleusercontent.com&client_secret=j9iVZfS8kkCEFUPaAeJV0sAi&refresh_token=$refreshToken',
+    'grant_type=refresh_token&client_id=563584335869-fgrhgmd47bqnekij5i8b5pr03ho849e6.apps.googleusercontent.com&client_secret=j9iVZfS8kkCEFUPaAeJV0sAi&refresh_token=$refreshToken',
   );
 
   if (response.statusCode == 200) {
@@ -551,19 +551,19 @@ Future<String> getAccessToken() async {
 
 // Return string value of "GoogleService-Info.plist" or "google-services.json" file for relevant platform
 Future<String> getServiceFileContent(
-  String projectId,
-  String appId,
-  String accessToken,
-  String platform,
-) async {
+    String projectId,
+    String appId,
+    String accessToken,
+    String platform,
+    ) async {
   String? uri;
 
   if (platform == kIos || platform == kMacos) {
     uri =
-        'https://firebase.googleapis.com/v1beta1/projects/$projectId/iosApps/$appId/config';
+    'https://firebase.googleapis.com/v1beta1/projects/$projectId/iosApps/$appId/config';
   } else if (platform == kAndroid) {
     uri =
-        'https://firebase.googleapis.com/v1beta1/projects/$projectId/androidApps/$appId/config';
+    'https://firebase.googleapis.com/v1beta1/projects/$projectId/androidApps/$appId/config';
   } else {
     throw ServiceFileException(
       platform,