dependencies: [
    .package(url: "https://github.com/kevinhermawan/ViewState.git", .upToNextMajor(from: "1.2.2"))
]

import SwiftUI
import ViewState
struct Example: View {
    @State private var viewState: ViewState? = .loading
    var body: some View {
        VStack {
            Text("This is the main content.")
        }
        .when(viewState, is: .loading) {
            ProgressView()
                .progressViewStyle(.circular)
        }
        .when(viewState, is: .empty) {
            ContentUnavailableView {
                Text("There is no data to display.")
            }
        }
        .whenError(viewState) { message in
            ContentUnavailableView {
                Text(message)
            }
        }
    }
}