Event.kt

// Event.kt
sealed interface Event {
    fun nextDestination(): Destination

    data object OnBack : Event {
        override fun nextDestination(): Destination = Destination.Back
    }
}

// ShoppingEvent.kt
object PreferenceEvent {
    data class OnItemClick(itemId: String) : Event {
        override fun nextDestination(): Destination = ShoppingDestination.Details(itemId = itemId)
    }

    data object OnCartClick : Event {
        override fun nextDestination(): Destination = ShoppingDestination.Cart
    }

    data object OnCheckoutClick : Event {
        override fun nextDestination(): Destination = ShoppingDestination.Payment
    }
}