@byldd/expo-google-signin

This README provides a step-by-step guide to set up Google Sign-In for Expo projects using the @byldd/expo-google-signin package.

Steps

1. Create a New Expo Project

Run the following command to create a new Expo project:

npx create-expo-app@latest

2. Prebuild the Project

Run the following command to generate the android and ios directories:

npx expo prebuild

This command creates the necessary native directories for iOS and Android.

3. Update app.json File

Add the following plugins to the app.json file:

"plugins": [
  "@react-native-firebase/app",
  "@react-native-firebase/auth",
  "@react-native-google-signin/google-signin",
  [
    "expo-build-properties",
    {
      "ios": {
        "useFrameworks": "static"
      }
    }
  ]
]

4. Create a New Firebase Project

Setup iOS Project
- For the app bundle ID, go to the app.json file.
- Inside the ios section, copy the bundleIdentifier and use it to configure the iOS app in Firebase.
- Note: Do not download GoogleService-Info.plist at this point to avoid the reverse client ID bug.
Setup Android Project
- For the app bundle ID, go to the app.json file.
- Inside the android section, copy the package and use it to configure the Android app in Firebase.
- Note: Do not download google-services.json at this point to avoid the reverse client ID bug.
Generate SHA1 and SHA256 Keys
- Run the following commands to generate the SHA1 and SHA256 keys:
```
cd android && ./gradlew signingReport
```
- Copy the SHA1 and SHA256 keys of the debug variant.
Add SHA Keys to Firebase
- Go to Settings in your Firebase project.
- Add the SHA1 and SHA256 keys under the project settings.
Enable Google Authentication
- In Firebase, go to Authentication.
- Enable the Google provider.
Download Configuration Files
- Download the GoogleService-Info.plist and google-services.json files from Firebase.
- Place these files in the root folder of your Expo project.
Update app.json with File Paths
- Add the path to the GoogleService-Info.plist file in the ios section of the app.json file:
```
"ios": {
  "googleServicesFile": "./GoogleService-Info.plist"
}
```
- Add the path to the google-services.json file in the android section of the app.json file:
```
"android": {
  "googleServicesFile": "./google-services.json"
}
```

5. Install Required Packages

Run the following command to install the required npm packages:

npm install @react-native-firebase/app @react-native-firebase/auth @react-native-google-signin/google-signin expo-build-properties @byldd/expo-google-signin

6. Prebuild the Project Again

Run the following command to ensure all the configurations are applied:

npx expo prebuild

7. Usage Example

Here is an example of how to use the @byldd/expo-google-signin package in your project:

Note: Make sure to pick the client_id with client_type: 3 from your google-services.json file.

import { GoogleSigninService } from "@byldd/expo-google-signin";

const handleGoogleSignin = async (webClientId: string) => {
  try {
    const user = await GoogleSigninService.googleSignIn(webClientId);
    console.log(user);
  } catch (error) {
    console.warn(error);
  }
};

With these steps, you should be able to successfully set up Google Sign-In in your React Native project using the @byldd/expo-google-signin package.