Using if condition in Kingfisher.shared.retrieveImage

Hi. This short code for Kingfisher goes like this

KingfisherManager.shared.retrieveImage(with: ImageResource(downloadURL: URL(string: "URL HERE")!)) { result in
          switch result {
            case .success(let value):              
              break
            default:
              break
          }
        }

I am actually interested in .success only but if i remove default it will show an error message like Switch must be exhaustive.

How to make this an if statement that goes something like this

if result == .success {
  how to get value in scope here so i can use it. thoughts?
}