@View
struct Counter {
    @State var count = 0

    var body: some View {
        div {
            p { "Count: \(count)" }
            button { "Increment" }
                .onClick { count += 1 }
        }.onAppear {
            try? console().log("Hello from Swift!")
        }
    }
}

import JavaScriptKit

@JSFunction func console() throws(JSException) -> Console

@JSClass struct Console {
    @JSFunction func log(_ message: String) throws(JSException) -> Void
}