title: GIDSignIn.sharedInstance : sharedInstance not a function?
body: <p>In this code, when I type GIDSignIn.sharedInstance, for some reason sharedInstance is not a function, which means I can't acces clientID. I cannot find a solution for this anywhere.</p>
  <pre><code>import UIKit
  import GoogleSignIn
  
  
  @main
  
  class AppDelegate: UIResponder, UIApplicationDelegate {
  
      var window: UIWindow?
  
      func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -&gt; Bool {
          
  GIDSignIn.sharedInstance().clientID = &quot;clientID&quot;
          
            return true
      }
  </code></pre>