AppNavigationTarget.swift

enum AppNavigationTarget: Hashable {
    case related(to: Post, showOriginal: Bool, postType: PostType)
    case showPost(parentId: String, showRealted: Bool, postType: PostType)
    case user(User, sort: FeedType.UserSort, postType: PostType)
    case search(String, postType: PostType, searchType: SearchType)
    
    case favorites(sort: FeedType.FavoritesSort, postType: PostType)
    case follows(sort: FeedType.FollowsSort, postType: PostType)
    case community(sort: FeedType.CommunitySort, postType: PostType)
}

CallsiteExample.swift

// ...

Button("Submit") {
  navigationController.navigate(to: .search(searchText, postType: .all, searchType: .advanced))
}

// ...

NavigationController.swift

final class NavigationController: ObservableObject {
    @Published var path = NavigationPath()
    
    init(initialValue: AppNavigationTarget? = nil) {
        if let initialValue {
            path.append(initialValue)
        }
    }
        
    func popToRoot() {
        path.removeLast(path.count)
    }
    
    var isEmpty: Bool {
        path.isEmpty
    }
    
    func navigate(to target: AppNavigationTarget) {
        path.append(target)
        objectWillChange.send()
    }
}

RootView.swift

struct RootView: View {
  // ...
  @ObservedObject var navigationController = NavigationController()  
  
  var body: View {
      NavigationStack(path: $navigationController.path) {
          InitialView()
            .navigationDestination(for: AppNavigationTarget.self) { target in
                switch target {
                case let .related(toPost, showOriginal, postType):
                    RelatedView(
                      post: toPost, 
                      showOriginal: showOriginal, 
                      postType: postType, 
                      navigationController: navigationController
                    )
                // ....
                // navigationController can also be an Environment set variable
                }
            }
        }
   }
}