old.kt

//Listen app theme mode (dark, light)
private val selectedThemeChannel: ConflatedBroadcastChannel<String> by lazy {
    ConflatedBroadcastChannel<String>().also { channel ->
        channel.trySend(selectedTheme)
    }
}

private val changeListener = SharedPreferences.OnSharedPreferenceChangeListener { _, key ->
    when (key) {
        PREF_DARK_MODE_ENABLED -> selectedThemeChannel.trySend(selectedTheme)
    }
}

val selectedThemeFlow: Flow<String>
    get() = selectedThemeChannel.asFlow()