diff --git a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/DeclarationsInPackageProvider.kt b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/DeclarationsInPackageProvider.kt
new file mode 100644
index 00000000000..f9bb58efa8d
--- /dev/null
+++ b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/DeclarationsInPackageProvider.kt
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.analysis.api.fir.scopes
+
+import org.jetbrains.kotlin.analysis.api.fir.KtFirAnalysisSession
+import org.jetbrains.kotlin.analysis.providers.impl.forEachNonKotlinPsiElementFinder
+import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.extensions.declarationGenerators
+import org.jetbrains.kotlin.fir.extensions.extensionService
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.platform.jvm.isJvm
+
+internal object DeclarationsInPackageProvider {
+    internal fun getTopLevelClassifierNamesInPackageProvider(packageFqName: FqName, analysisSession: KtFirAnalysisSession): Set<Name> {
+        return buildSet {
+            addAll(analysisSession.useSiteScopeDeclarationProvider.getTopLevelKotlinClassLikeDeclarationNamesInPackage(packageFqName))
+
+            when {
+                analysisSession.targetPlatform.isJvm() -> {
+                    forEachNonKotlinPsiElementFinder(analysisSession.project) { finder ->
+                        finder.findPackage(packageFqName.asString())
+                            ?.getClasses(analysisSession.useSiteAnalysisScope)
+                            ?.mapNotNullTo(this) { it.name?.let(Name::identifier) }
+                    }
+                }
+            }
+
+            addAll(collectGeneratedTopLevelClassifiers(packageFqName, analysisSession.useSiteSession))
+        }
+    }
+
+    internal fun getTopLevelCallableNamesInPackageProvider(packageFqName: FqName, analysisSession: KtFirAnalysisSession): Set<Name> {
+        return buildSet {
+            addAll(analysisSession.useSiteScopeDeclarationProvider.getTopLevelCallableNamesInPackage(packageFqName))
+            addAll(collectGeneratedTopLevelCallables(packageFqName, analysisSession.useSiteSession))
+        }
+    }
+
+
+    private fun collectGeneratedTopLevelClassifiers(packageFqName: FqName, session: FirSession): Set<Name> {
+        val declarationGenerators = session.extensionService.declarationGenerators
+
+        val generatedTopLevelClassifiers = declarationGenerators
+            .asSequence()
+            .flatMap {
+                // FIXME this function should be called only once during plugin's lifetime, so this usage is not really correct (2)
+                it.getTopLevelClassIds()
+            }
+            .filter { it.packageFqName == packageFqName }
+            .map { it.shortClassName }
+
+        return generatedTopLevelClassifiers.toSet()
+    }
+
+    private fun collectGeneratedTopLevelCallables(packageFqName: FqName, session: FirSession): Set<Name> {
+        val generators = session.extensionService.declarationGenerators
+
+        val generatedTopLevelDeclarations = generators
+            .asSequence()
+            .flatMap {
+                // FIXME this function should be called only once during plugin's lifetime, so this usage is not really correct (1)
+                it.getTopLevelCallableIds()
+            }
+            .filter { it.packageName == packageFqName }
+            .map { it.callableName }
+
+        return generatedTopLevelDeclarations.toSet()
+    }
+}
\ No newline at end of file
diff --git a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/KtFirPackageScope.kt b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/KtFirPackageScope.kt
index 4da668b0043..522e8ec6acd 100644
--- a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/KtFirPackageScope.kt
+++ b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/KtFirPackageScope.kt
@@ -14,14 +14,9 @@ import org.jetbrains.kotlin.analysis.api.symbols.KtCallableSymbol
 import org.jetbrains.kotlin.analysis.api.symbols.KtClassifierSymbol
 import org.jetbrains.kotlin.analysis.api.symbols.KtConstructorSymbol
 import org.jetbrains.kotlin.analysis.api.symbols.KtPackageSymbol
-import org.jetbrains.kotlin.analysis.providers.impl.forEachNonKotlinPsiElementFinder
-import org.jetbrains.kotlin.fir.extensions.FirExtensionService
-import org.jetbrains.kotlin.fir.extensions.declarationGenerators
-import org.jetbrains.kotlin.fir.extensions.extensionService
 import org.jetbrains.kotlin.fir.scopes.impl.FirPackageMemberScope
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
-import org.jetbrains.kotlin.platform.jvm.isJvm
 
 internal class KtFirPackageScope(
     private val fqName: FqName,
@@ -33,62 +28,12 @@ internal class KtFirPackageScope(
         FirPackageMemberScope(fqName, analysisSession.useSiteSession)
     }
 
-    private val firExtensionService: FirExtensionService
-        get() = firScope.session.extensionService
-
     override fun getPossibleCallableNames(): Set<Name> = withValidityAssertion {
-        hashSetOf<Name>().apply {
-            addAll(analysisSession.useSiteScopeDeclarationProvider.getTopLevelCallableNamesInPackage(fqName))
-            addAll(collectGeneratedTopLevelCallables())
-        }
+        DeclarationsInPackageProvider.getTopLevelCallableNamesInPackageProvider(fqName, analysisSession)
     }
 
     override fun getPossibleClassifierNames(): Set<Name> = withValidityAssertion {
-        hashSetOf<Name>().apply {
-            addAll(analysisSession.useSiteScopeDeclarationProvider.getTopLevelKotlinClassLikeDeclarationNamesInPackage(fqName))
-
-            when {
-                analysisSession.targetPlatform.isJvm() -> {
-                    forEachNonKotlinPsiElementFinder(analysisSession.project) { finder ->
-                        finder.findPackage(fqName.asString())
-                            ?.getClasses(analysisSession.useSiteAnalysisScope)
-                            ?.mapNotNullTo(this) { it.name?.let(Name::identifier) }
-                    }
-                }
-            }
-
-            addAll(collectGeneratedTopLevelClassifiers())
-        }
-    }
-
-    private fun collectGeneratedTopLevelCallables(): Set<Name> {
-        val generators = firExtensionService.declarationGenerators
-
-        val generatedTopLevelDeclarations = generators
-            .asSequence()
-            .flatMap {
-                // FIXME this function should be called only once during plugin's lifetime, so this usage is not really correct (1)
-                it.getTopLevelCallableIds()
-            }
-            .filter { it.packageName == fqName }
-            .map { it.callableName }
-
-        return generatedTopLevelDeclarations.toSet()
-    }
-
-    private fun collectGeneratedTopLevelClassifiers(): Set<Name> {
-        val declarationGenerators = firExtensionService.declarationGenerators
-
-        val generatedTopLevelClassifiers = declarationGenerators
-            .asSequence()
-            .flatMap {
-                // FIXME this function should be called only once during plugin's lifetime, so this usage is not really correct (2)
-                it.getTopLevelClassIds()
-            }
-            .filter { it.packageFqName == fqName }
-            .map { it.shortClassName }
-
-        return generatedTopLevelClassifiers.toSet()
+        DeclarationsInPackageProvider.getTopLevelClassifierNamesInPackageProvider(fqName, analysisSession)
     }
 
     override fun getCallableSymbols(nameFilter: KtScopeNameFilter): Sequence<KtCallableSymbol> = withValidityAssertion {