DelegatedIntentExtra.kt

fun <T> intentExtra(defaultValue: T? = null) = object : ReadOnlyProperty<Activity, T?> {
    override fun getValue(thisRef: Activity, property: KProperty<*>): T? {
        return when (defaultValue) {
            is String -> thisRef.intent.getStringExtra(property.name) as T
            is Int -> thisRef.intent.getIntExtra(property.name, defaultValue) as T
            is Long -> thisRef.intent.getLongExtra(property.name, defaultValue) as T
            // And More...
            else -> null
        }
    }
}

FestivalActivity.kt

class FestivalActivity : BaseActivity<ActvFestivalBinding, FestivalViewModel>() {

    object FestivalDeepLinkIntents : DeeplinkActivityIntents {

        @JvmStatic
        @CommonUrlDeepLink("festivals/{extraId}")
        fun intentForDeepLinkMethod(context: Context) =
            createTaskBuilder(context,
                Intent(context, MainActivity::class.java),
                Intent(context, FestivalActivity::class.java)
            )

    }

    override val viewModel: FestivalViewModel by viewModel()
    override val layoutResId: Int = R.layout.actv_festival

    private val extraId by intentExtra<String>()

    override fun onCreate(savedInstanceState: Bundle?) {
        loadKoinModules(FestivalModuleRepository.modules)
        super.onCreate(savedInstanceState)

        setupToolbar(binding.toolbar, true)

        binding.viewModel = viewModel

        extraId?.let(viewModel::requestFestival) ?: finish()
    }

}