docs(firebase_analytics): example app initialization and docs support status

docs/auth/social.mdx

@@ -37,9 +37,13 @@ Install the official [`google_sign_in`](https://pub.dev/packages/google_sign_in)
 
 ```yaml title="pubspec.yaml"
 dependencies:
-  google_sign_in: "{{ external.google_sign_in }}"
+  google_sign_in: '{{ external.google_sign_in }}'
 ```
 
+:::caution
+Dart-only initialization isn't yet supported by `google_sign_in` plugin, in which case you still have to do the [manual installation](./manual-installation.mdx) if you're using Google as an auth provider.
+:::
+
 Once installed, trigger the sign-in flow and create a new credential:
 
 ```dart
@@ -127,7 +131,7 @@ Install the [`flutter_facebook_auth`](https://pub.dev/packages/flutter_facebook_
 
 ```yaml title="pubspec.yaml"
 dependencies:
-  flutter_facebook_auth: "{{ external.flutter_facebook_auth }}"
+  flutter_facebook_auth: '{{ external.flutter_facebook_auth }}'
 ```
 
 You will need to follow the steps in the plugin documentation to ensure that both the Android & iOS Facebook SDKs have been initialized
@@ -199,7 +203,6 @@ to `true` if your user logs in with Facebook. Should your user login using a pro
 For further information, see this [issue](https://github.com/FirebaseExtended/flutterfire/issues/4612#issuecomment-782107867).
 :::
 
-
 ## Apple
 
 Apple [announced](https://developer.apple.com/news/?id=09122019b) that any applications using 3rd party login
@@ -283,12 +286,13 @@ Future<UserCredential> signInWithApple() async {
   return await FirebaseAuth.instance.signInWithCredential(oauthCredential);
 }
 ```
+
 </TabItem>
 
 <TabItem value="android">
 
-  At the moment, the preferable solution is blocked by this
-  [issue](https://github.com/FirebaseExtended/flutterfire/issues/2691).
+At the moment, the preferable solution is blocked by this
+[issue](https://github.com/FirebaseExtended/flutterfire/issues/2691).
 
 </TabItem>
 
@@ -313,6 +317,7 @@ Future<UserCredential> signInWithApple() async {
 
 An alternative is to use `signInWithRedirect`. In that case the browser will navigate away from your app
 and you have to use `getRedirectResult` to check for authentication results during app startup.
+
 </TabItem>
 </Tabs>
 
@@ -370,7 +375,7 @@ Future<UserCredential> signInWithTwitter() async {
 <TabItem value="web">
 
 On the web, the Twitter SDK provides support for automatically handling the authentication flow using the
-Twitter application details provided on the Firebase console.  Ensure that the callback URL in the Firebase console is added
+Twitter application details provided on the Firebase console. Ensure that the callback URL in the Firebase console is added
 as a callback URL in your Twitter application on their developer console.
 
 For example:
@@ -401,7 +406,6 @@ Ensure that you have setup an OAuth App from your [GitHub Developer Settings](ht
 that the "GitHub" sign-in provider is enabled on the [Firebase Console](https://console.firebase.google.com/project/_/authentication/providers)
 with the Client ID and Secret are set, with the callback URL set in the GitHub app.
 
-
 <Tabs
   defaultValue="native"
   values={[
@@ -448,7 +452,7 @@ Future<UserCredential> signInWithGitHub() async {
 <TabItem value="web">
 
 On the web, the GitHub SDK provides support for automatically handling the authentication flow using the
-GitHub application details provided on the Firebase console.  Ensure that the callback URL in the Firebase console is added
+GitHub application details provided on the Firebase console. Ensure that the callback URL in the Firebase console is added
 as a callback URL in your GitHub application on the developer console.
 
 For example:

docs/cli.mdx

@@ -20,6 +20,21 @@ Once installed, the `flutterfire` command will be globally available.
 
 ## Usage
 
+:::note
+Some plugins or platforms do not support Dart-only initialization **yet**, for which you will use the platform
+config files through the [manual installation](./manual-installation.mdx). The following table shows the current
+status of support, the plugins not in this table are fully supported.
+:::
+| Plugin | iOS | Android | Web | macOS |
+| --------- | --- | ------- | --- | ----- |
+| Analytics | ✔ | ❌ | ✔ | ✔ |
+| Crashlytics | ❌ | ❌ | N/A | ❌ |
+| Dynamic Links | ❌ | ✔ | N/A | N/A |
+| In-App Messaging | ❌ | ✔ | N/A | ❌ |
+| Performance Monitoring | ✔ | ❌ | ❌ | N/A |
+
+In addition, [`google_sign_in` plugin](./auth/social#google) which is used by `firebase_auth` also requires manual installation.
+
 ### Generating Firebase Options
 
 FlutterFire can now be initialized from Dart on all platforms using `Firebase.initializeApp`, however

packages/firebase_analytics/firebase_analytics/example/android/app/build.gradle

@@ -23,6 +23,7 @@ if (flutterVersionName == null) {
 
 apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+apply plugin: 'com.google.gms.google-services'
 
 android {
     compileSdkVersion 29

packages/firebase_analytics/firebase_analytics/example/lib/firebase_config.dart

@@ -0,0 +1,43 @@
+import 'dart:developer';
+import 'dart:io';
+
+import 'package:firebase_core/firebase_core.dart';
+import 'package:flutter/foundation.dart';
+
+class DefaultFirebaseConfig {
+  static FirebaseOptions? get platformOptions {
+    if (kIsWeb) {
+      // Web
+      return const FirebaseOptions(
+        apiKey: 'AIzaSyAgUhHU8wSJgO5MVNy95tMT07NEjzMOfz0',
+        authDomain: 'react-native-firebase-testing.firebaseapp.com',
+        databaseURL: 'https://react-native-firebase-testing.firebaseio.com',
+        projectId: 'react-native-firebase-testing',
+        storageBucket: 'react-native-firebase-testing.appspot.com',
+        messagingSenderId: '448618578101',
+        appId: '1:448618578101:web:0b650370bb29e29cac3efc',
+        measurementId: 'G-F79DJ0VFGS',
+      );
+    } else if (Platform.isIOS || Platform.isMacOS) {
+      // iOS and MacOS
+      return const FirebaseOptions(
+        appId: '1:448618578101:ios:cc6c1dc7a65cc83c',
+        apiKey: 'AIzaSyAHAsf51D0A407EklG1bs-5wA7EbyfNFg0',
+        projectId: 'react-native-firebase-testing',
+        messagingSenderId: '448618578101',
+        iosBundleId: 'com.invertase.testing',
+        iosClientId:
+            '448618578101-28tsenal97nceuij1msj7iuqinv48t02.apps.googleusercontent.com',
+        androidClientId:
+            '448618578101-a9p7bj5jlakabp22fo3cbkj7nsmag24e.apps.googleusercontent.com',
+        databaseURL: 'https://react-native-firebase-testing.firebaseio.com',
+        storageBucket: 'react-native-firebase-testing.appspot.com',
+      );
+    } else {
+      // Android
+      log("Analytics Dart-only initializer doesn't work on Android, please make sure to add the config file.");
+
+      return null;
+    }
+  }
+}

packages/firebase_analytics/firebase_analytics/example/lib/main.dart

@@ -8,22 +8,12 @@ import 'package:firebase_analytics/firebase_analytics.dart';
 import 'package:firebase_core/firebase_core.dart';
 import 'package:flutter/material.dart';
 
+import 'firebase_config.dart';
 import 'tabs_page.dart';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
-  await Firebase.initializeApp(
-    options: const FirebaseOptions(
-      apiKey: 'AIzaSyAgUhHU8wSJgO5MVNy95tMT07NEjzMOfz0',
-      authDomain: 'react-native-firebase-testing.firebaseapp.com',
-      databaseURL: 'https://react-native-firebase-testing.firebaseio.com',
-      projectId: 'react-native-firebase-testing',
-      storageBucket: 'react-native-firebase-testing.appspot.com',
-      messagingSenderId: '448618578101',
-      appId: '1:448618578101:web:772d484dc9eb15e9ac3efc',
-      measurementId: 'G-0N1G9FLDZE',
-    ),
-  );
+  await Firebase.initializeApp(options: DefaultFirebaseConfig.platformOptions);
   runApp(const MyApp());
 }