currentPlatform property Null safety

Implementation

static FirebaseOptions get currentPlatform {
  if (kIsWeb) {
    throw UnsupportedError(
      'DefaultFirebaseOptions have not been configured for web - '
      'you can reconfigure this by running the FlutterFire CLI again.',
    );
  }
  switch (defaultTargetPlatform) {
    case TargetPlatform.android:
      return android;
    case TargetPlatform.iOS:
      return ios;
    case TargetPlatform.macOS:
      throw UnsupportedError(
        'DefaultFirebaseOptions have not been configured for macos - '
        'you can reconfigure this by running the FlutterFire CLI again.',
      );
    case TargetPlatform.windows:
      throw UnsupportedError(
        'DefaultFirebaseOptions have not been configured for windows - '
        'you can reconfigure this by running the FlutterFire CLI again.',
      );
    case TargetPlatform.linux:
      throw UnsupportedError(
        'DefaultFirebaseOptions have not been configured for linux - '
        'you can reconfigure this by running the FlutterFire CLI again.',
      );
    default:
      throw UnsupportedError(
        'DefaultFirebaseOptions are not supported for this platform.',
      );
  }
}