Android "Guide to app architecture : UI events" ViewModel Live Template code for Android dev. see: "https://developer.android.com/jetpack/guide/ui-layer/events"

ViewModelLiveTemplate.kt

data class UserMessage(val id: Long, val title: String, val message: String)
data class $name$UiState(
    val userMessages: List<UserMessage> = kotlin.collections.emptyList(),
)

class $name$ViewModel : androidx.lifecycle.ViewModel() {
    private val _uiState = kotlinx.coroutines.flow.MutableStateFlow($name$UiState())
    val uiState: kotlinx.coroutines.flow.StateFlow<$name$UiState> = _uiState

    private fun showMessage(title: String, message: String) {
        _uiState.update { currentUiState ->
            currentUiState.copy(
                userMessages = currentUiState.userMessages + userMessage(title, message)
            )
        }
    }

    fun userMessageShown(messageId: Long) {
        _uiState.update { currentUiState ->
            val messages = currentUiState.userMessages.filterNot { it.id == messageId }
            currentUiState.copy(userMessages = messages)
        }
    }
}

private fun userMessage(title: String, message: String) = UserMessage(
    java.util.UUID.randomUUID().mostSignificantBits,
    title,
    message,
)