new.kt

class PreferenceDataStore<T>(
    private val dataStore: DataStore<Preferences>,
    private val key: Preferences.Key<T>,
    private val defaultValue: T
) : ReadWriteProperty<Any, T> {

    @WorkerThread
    override fun getValue(thisRef: Any, property: KProperty<*>) =
        dataStore.get(key = key, defaultValue = defaultValue)

    override fun setValue(thisRef: Any, property: KProperty<*>, value: T) {
        dataStore.set(key = key, value = value)
    }
}