BaseFragment.kt

abstract class BaseFragment<VM : BaseViewModel, DB : ViewDataBinding> : Fragment() {
    
      abstract val viewModel: VM
    
      @CallSuper
      open fun bindObservables() {
        (viewModel as? EmptyObservableHost)?.let {
            it.getObservableLiveDataList().forEach {
                it.observe(viewLifecycleOwner, {})
            }
        }
      }
      
    
}

EmptyObservableHost.kt

import androidx.lifecycle.LiveData

interface EmptyObservableHost {
    fun getObservableLiveDataList(): List<LiveData<Any>>
}

GithubSearchViewModel.kt

class GithubSearchViewModel(
    private val searchGithubUseCase: SearchGithubUseCase,
    private val likeGithubUseCase: LikeGithubRepoUseCase
) : BaseViewModel(), EmptyObservableHost {

    private val searchEvent: MediatorLiveData<String?> = searchQuery.map {
        if (it.isNullOrBlank() || (restoredSearchQuery != null && restoredSearchQuery == it)) null
        else {
            pageNumber = 1
            currentGithubQueryList.clear()
            it.trim()
        }
    }.debounce(SEARCH_DEBOUNCE_TIME, viewModelScope)
    
    
    private val searchEventAction = searchEvent.map {
        if (it.isNullOrEmpty()) {
            _onEmptySearchEvent.postValue(LiveEvent())
        } else {
            searchJob?.cancel()
            searchJob = doSearch(it, false)
        }
        return@map Any()
    }
    
    
    override fun getObservableLiveDataList(): List<LiveData<Any>> {
        return listOf(searchEventAction)
    }
    
}