return providers.flatMapTo(mutableListOf()) { it.getTopLevelCallableFiles(callableId) }
    }

    override fun getTopLevelCallableNamesInPackage(packageFqName: FqName): Set<Name> {
        return providers.flatMapTo(mutableSetOf()) { it.getTopLevelCallableNamesInPackage(packageFqName) }
    }

    override fun findFilesForFacadeByPackage(packageFqName: FqName): Collection<KtFile> {

        return buildSet {
            addAll(
                analysisSession.symbolNamesProvider.getTopLevelCallableNamesInPackage(packageFqName)
                    ?: analysisSession.useSiteScopeDeclarationProvider.getTopLevelCallableNamesInPackage(packageFqName)
            )
            addAll(collectGeneratedTopLevelCallables(packageFqName, analysisSession.useSiteSession))
        }
    }

    override fun getTopLevelFunctions(callableId: CallableId): List<KtNamedFunction> = emptyList()
    override fun getTopLevelCallableFiles(callableId: CallableId): List<KtFile> = emptyList()
    override fun getTopLevelCallableNamesInPackage(packageFqName: FqName): Set<Name> = emptySet()
    override fun findFilesForFacadeByPackage(packageFqName: FqName): List<KtFile> = emptyList()

    public abstract fun getTopLevelFunctions(callableId: CallableId): Collection<KtNamedFunction>

    public abstract fun getTopLevelCallableFiles(callableId: CallableId): Collection<KtFile>

    public abstract fun getTopLevelCallableNamesInPackage(packageFqName: FqName): Set<Name>

    public abstract fun findFilesForFacadeByPackage(packageFqName: FqName): Collection<KtFile>

    public abstract fun findFilesForFacade(facadeFqName: FqName): Collection<KtFile>

            getTopLevelProperties(callableId).mapTo(this) { it.containingKtFile }
            getTopLevelFunctions(callableId).mapTo(this) { it.containingKtFile }
        }
    }

    override fun getTopLevelCallableNamesInPackage(packageFqName: FqName): Set<Name> {
        return getTopLevelDeclarationNames<KtCallableDeclaration>(packageFqName)
    }

        return classifiers.filter { it.inScope }
            .mapNotNullTo(mutableSetOf()) { it.nameAsName }
    }

    override fun getTopLevelCallableNamesInPackage(packageFqName: FqName): Set<Name> {
        val callables = index.topLevelPropertyMap[packageFqName].orEmpty() + index.topLevelFunctionMap[packageFqName].orEmpty()
        return callables