diff --git a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/completion/KotlinFirCompletionContributor.kt b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/completion/KotlinFirCompletionContributor.kt
index 52a58bf8e53..f8040e813d4 100644
--- a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/completion/KotlinFirCompletionContributor.kt
+++ b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/completion/KotlinFirCompletionContributor.kt
@@ -7,9 +7,7 @@ package org.jetbrains.kotlin.idea.completion
 
 import com.intellij.codeInsight.completion.*
 import com.intellij.codeInsight.lookup.LookupElementBuilder
-import com.intellij.openapi.project.Project
 import com.intellij.patterns.PlatformPatterns
-import com.intellij.psi.search.GlobalSearchScope
 import com.intellij.util.ProcessingContext
 import org.jetbrains.kotlin.idea.frontend.api.getAnalysisSessionFor
 import org.jetbrains.kotlin.idea.frontend.api.symbols.KtCallableSymbol
@@ -18,11 +16,6 @@ import org.jetbrains.kotlin.idea.frontend.api.symbols.KtPossibleExtensionSymbol
 import org.jetbrains.kotlin.idea.frontend.api.symbols.isExtension
 import org.jetbrains.kotlin.idea.frontend.api.types.KtType
 import org.jetbrains.kotlin.idea.references.mainReference
-import org.jetbrains.kotlin.idea.stubindex.KotlinTopLevelFunctionByPackageIndex
-import org.jetbrains.kotlin.idea.stubindex.KotlinTopLevelPropertyByPackageIndex
-import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.name.Name
-import org.jetbrains.kotlin.psi.KtCallableDeclaration
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.psi.KtLabelReferenceExpression
 import org.jetbrains.kotlin.psi.KtSimpleNameExpression
@@ -87,22 +80,4 @@ private fun KtCallableSymbol.canBeCalledWith(implicitReceivers: List<KtType>): B
 
     val requiredReceiverType = receiverType ?: error("Receiver type should be present")
     return implicitReceivers.any { it.isSubTypeOf(requiredReceiverType) }
-}
-
-class PackageIndexHelper(private val project: Project) {
-    //todo use more concrete scope
-    private val searchScope = GlobalSearchScope.allScope(project)
-
-    private val functionByPackageIndex = KotlinTopLevelFunctionByPackageIndex.getInstance()
-    private val propertyByPackageIndex = KotlinTopLevelPropertyByPackageIndex.getInstance()
-
-    fun getPackageTopLevelNames(packageFqName: FqName): Set<Name> {
-        return getTopLevelCallables(packageFqName).mapTo(mutableSetOf()) { it.nameAsSafeName }
-    }
-
-    @OptIn(ExperimentalStdlibApi::class)
-    private fun getTopLevelCallables(packageFqName: FqName): List<KtCallableDeclaration> = buildList {
-        addAll(functionByPackageIndex.get(packageFqName.asString(), project, searchScope))
-        addAll(propertyByPackageIndex.get(packageFqName.asString(), project, searchScope))
-    }
-}
+}
\ No newline at end of file
diff --git a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/scopes/KtFirStarImportingScope.kt b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/scopes/KtFirStarImportingScope.kt
index ad28a6c0f8f..df2bc2d994b 100644
--- a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/scopes/KtFirStarImportingScope.kt
+++ b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/scopes/KtFirStarImportingScope.kt
@@ -6,9 +6,9 @@
 package org.jetbrains.kotlin.idea.frontend.api.fir.scopes
 
 import com.intellij.openapi.project.Project
+import com.intellij.psi.search.GlobalSearchScope
 import org.jetbrains.kotlin.fir.scopes.impl.FirAbstractStarImportingScope
 import org.jetbrains.kotlin.fir.scopes.impl.FirDefaultStarImportingScope
-import org.jetbrains.kotlin.idea.completion.PackageIndexHelper
 import org.jetbrains.kotlin.idea.frontend.api.ValidityOwner
 import org.jetbrains.kotlin.idea.frontend.api.ValidityOwnerByValidityToken
 import org.jetbrains.kotlin.idea.frontend.api.fir.KtSymbolByFirBuilder
@@ -17,7 +17,11 @@ import org.jetbrains.kotlin.idea.frontend.api.scopes.Import
 import org.jetbrains.kotlin.idea.frontend.api.scopes.KtStarImportingScope
 import org.jetbrains.kotlin.idea.frontend.api.scopes.StarImport
 import org.jetbrains.kotlin.idea.frontend.api.withValidityAssertion
+import org.jetbrains.kotlin.idea.stubindex.KotlinTopLevelFunctionByPackageIndex
+import org.jetbrains.kotlin.idea.stubindex.KotlinTopLevelPropertyByPackageIndex
+import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.psi.KtCallableDeclaration
 
 internal class KtFirStarImportingScope(
     firScope: FirAbstractStarImportingScope,
@@ -58,3 +62,20 @@ internal class KtFirStarImportingScope(
     }
 
 }
+
+private class PackageIndexHelper(private val project: Project) {
+    //todo use more concrete scope
+    private val searchScope = GlobalSearchScope.allScope(project)
+
+    private val functionByPackageIndex = KotlinTopLevelFunctionByPackageIndex.getInstance()
+    private val propertyByPackageIndex = KotlinTopLevelPropertyByPackageIndex.getInstance()
+
+    fun getPackageTopLevelNames(packageFqName: FqName): Set<Name> {
+        return getTopLevelCallables(packageFqName).mapTo(mutableSetOf()) { it.nameAsSafeName }
+    }
+
+    private fun getTopLevelCallables(packageFqName: FqName): Sequence<KtCallableDeclaration> = sequence<KtCallableDeclaration> {
+        yieldAll(functionByPackageIndex.get(packageFqName.asString(), project, searchScope))
+        yieldAll(propertyByPackageIndex.get(packageFqName.asString(), project, searchScope))
+    }
+}
\ No newline at end of file