gistfile1.txt

@main
class AppDelegate: UIResponder, UIApplicationDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        ...
        
        FirebaseApp.configure()
        
        // Not sure why. We need to call this function for first_open to be sent automatically.
        // https://stackoverflow.com/questions/73600417/why-firebase-analytics-first-open-event-is-not-sent-automatically-unless-i-first
        Analytics.setAnalyticsCollectionEnabled(true)
        
        return true
    }