docs: Updated Expo installation steps

.spellcheck.dict.txt

@@ -64,6 +64,7 @@ HTTP
 HTTPS
 IDFA
 installable
+IntelliSense
 Interstitials
 interstitials
 Invertase

docs/crashlytics/android-setup.md

@@ -5,6 +5,8 @@ description: Additional Android steps for Crashlytics integration
 
 > If you're migrating from Fabric, make sure you remove the `fabric.properties` file from your Android project. If you do not do this you will not receive crash reports on the Firebase console.
 
+> If you're using Expo, make sure to add the `@react-native-firebase/crashlytics` config plugin to your `app.json` or `app.config.js`. It handles the below installation steps for you. For instructions on how to do that, view the [Expo](/#expo) installation section.
+
 # Adding Firebase Crashlytics Gradle Tools
 
 These steps are required, if you do not add these your app will most likely crash at startup with the following Error:

docs/crashlytics/usage/index.md

@@ -26,6 +26,8 @@ Once installed, you must complete the following additional setup steps for Andro
 
 - [Android Additional Setup](/crashlytics/android-setup).
 
+> If you're using Expo, make sure to add the `@react-native-firebase/crashlytics` config plugin to your `app.json` or `app.config.js`. It handles the Android installation steps for you. For instructions on how to do that, view the [Expo](/#expo) installation section.
+
 If you're using an older version of React Native without autolinking support, or wish to integrate into an existing project,
 you can follow the manual installation steps for [iOS](/crashlytics/usage/installation/ios) and [Android](/crashlytics/usage/installation/android).
 

docs/index.md

@@ -257,4 +257,42 @@ $RNFirebaseAsStaticFramework = true
 
 ### Expo
 
-Expo does not support integration with native modules via its ["Managed workflow"](https://docs.expo.io/versions/latest/introduction/managed-vs-bare/#managed-workflow). Integration is only possible when used with the ["Bare workflow"](https://docs.expo.io/versions/latest/introduction/managed-vs-bare/#bare-workflow).
+Integration with Expo is possible in both bare workflow and [custom managed workflow](https://docs.expo.io/workflow/customizing/) via [config plugins](https://docs.expo.io/guides/config-plugins/).
+
+React Native Firebase cannot be used in the "Expo Go" app, because [it requires custom native code](https://docs.expo.io/workflow/customizing/).
+
+#### Installation
+
+_If you're using [Bare Workflow](https://docs.expo.io/introduction/managed-vs-bare/#bare-workflow), please follow the above installation steps instead._
+
+After installing the `@react-native-firebase/app` NPM package, add the [config plugin](https://docs.expo.io/guides/config-plugins/) to the [`plugins`](https://docs.expo.io/versions/latest/config/app/#plugins) array of your `app.json` or `app.config.js`.
+
+Also, you have to provide paths to the `google-services.json` and `GoogleService-Info.plist` files by specifying the [`expo.android.googleServicesFile`](https://docs.expo.io/versions/latest/config/app/#googleservicesfile-1) and [`expo.ios.googleServicesFile`](https://docs.expo.io/versions/latest/config/app/#googleservicesfile) fields respectively.
+
+The `app.json` for integration that included the optional crashlytics and performance as well as the mandatory app plugin would look like this, customize based on which optional modules you use:
+
+```json
+{
+  "expo": {
+    "android": {
+      "googleServicesFile": "./google-services.json"
+    },
+    "ios": {
+      "googleServicesFile": "./GoogleService-Info.plist"
+    },
+    "plugins": [
+      "@react-native-firebase/app"
+      "@react-native-firebase/perf"
+      "@react-native-firebase/crashlytics"
+    ]
+  }
+}
+```
+
+Next, rebuild your app as described in the ["Adding custom native code"](https://docs.expo.io/workflow/customizing/) guide.
+
+Config plugins are only required for React Native Firebase modules, which require custom native installation steps - e.g. modifying the Xcode project, `Podfile`, `build.gradle`, `AndroidManifest.xml` etc. Packages without native steps required will work out of the box.
+
+> Not all React Native Firebase packages have Expo config plugins provided yet. You may see if a module is supported by checking if it contains the `app.plugin.js` file in its package directory.
+>
+> If you're using the [Expo Tools](https://marketplace.visualstudio.com/items?itemName=byCedric.vscode-expo) VSCode extension, the IntelliSense will display a list of available plugins, when editing the `plugins` section of `app.json`.

docs/perf/usage/index.md

@@ -27,6 +27,8 @@ you can follow the manual installation steps for [iOS](/perf/usage/installation/
 
 ## Add the Performance Monitoring Plugin
 
+> If you're using Expo, make sure to add the `@react-native-firebase/perf` config plugin to your `app.json` or `app.config.js`. It handles the below installation steps for you. For instructions on how to do that, view the [Expo](/#expo) installation section.
+
 On Android, you need to install the Google Performance Monitoring Plugin which enables automatic
 HTTPS network request monitoring.