diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/InteropCallableReferenceLowering.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/InteropCallableReferenceLowering.kt
index 7779c4f315b..846a9bed6d8 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/InteropCallableReferenceLowering.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/InteropCallableReferenceLowering.kt
@@ -204,6 +204,7 @@ class InteropCallableReferenceLowering(val context: JsIrBackendContext) : BodyLo
             visibility = lambdaClass.visibility
             returnType = expression.type
             name = factoryName
+            origin = FACTORY_ORIGIN
         }
 
         factoryDeclaration.parent = implicitDeclarationFile
@@ -231,5 +232,6 @@ class InteropCallableReferenceLowering(val context: JsIrBackendContext) : BodyLo
 
     companion object {
         object EXPLICIT_INVOKE : IrStatementOriginImpl("EXPLICIT_INVOKE")
+        object FACTORY_ORIGIN : IrDeclarationOriginImpl("FACTORY_ORIGIN")
     }
 }
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/JsCodeOutliningLowering.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/JsCodeOutliningLowering.kt
index d47dfbedbb3..ee2f29bd01e 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/JsCodeOutliningLowering.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/JsCodeOutliningLowering.kt
@@ -163,6 +163,7 @@ private class JsCodeOutlineTransformer(
             name = Name.identifier("outlinedJsCode$")
             visibility = DescriptorVisibilities.LOCAL
             returnType = backendContext.dynamicType
+            origin = OUTLINED_ORIGIN
         }
         // We don't need this function's body. Using empty block body stub, because some code might expect all functions to have bodies.
         outlinedFunction.body = backendContext.irFactory.createBlockBody(UNDEFINED_OFFSET, UNDEFINED_OFFSET)
@@ -215,4 +216,8 @@ private class JsCodeOutlineTransformer(
             }
         }
     }
+
+    companion object {
+        object OUTLINED_ORIGIN : IrDeclarationOriginImpl("OUTLINED_ORIGIN")
+    }
 }
\ No newline at end of file
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PropertyLazyInitLowering.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PropertyLazyInitLowering.kt
index 6c5ca289b56..c1576b1c85a 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PropertyLazyInitLowering.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PropertyLazyInitLowering.kt
@@ -282,7 +282,7 @@ private fun IrDeclaration.isCompatibleDeclaration() =
     origin in compatibleOrigins
 
 private fun IrDeclaration.assertCompatibleDeclaration() {
-    assert((this as? PersistentIrElementBase<*>)?.createdOn?.let { it == 0 } != false)
+    assert(this !is PersistentIrElementBase<*> || createdOn == 0)
 }
 
 private val compatibleOrigins = listOf(
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PropertyReferenceLowering.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PropertyReferenceLowering.kt
index 5fab1cebe1d..d0e62fd7326 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PropertyReferenceLowering.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PropertyReferenceLowering.kt
@@ -12,10 +12,7 @@ import org.jetbrains.kotlin.ir.backend.js.JsIrBackendContext
 import org.jetbrains.kotlin.ir.builders.*
 import org.jetbrains.kotlin.ir.builders.declarations.buildFun
 import org.jetbrains.kotlin.ir.builders.declarations.buildValueParameter
-import org.jetbrains.kotlin.ir.declarations.IrDeclaration
-import org.jetbrains.kotlin.ir.declarations.IrDeclarationParent
-import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
-import org.jetbrains.kotlin.ir.declarations.IrValueParameter
+import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.expressions.impl.IrCallImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrConstImpl
@@ -63,6 +60,7 @@ class PropertyReferenceLowering(private val context: JsIrBackendContext) : BodyL
                 endOffset = reference.endOffset
                 returnType = reference.type
                 name = Name.identifier("${property.name.asString()}\$factory")
+                origin = PROPERTY_REFERENCE_FACTORY
             }
 
             val boundArguments = listOfNotNull(reference.dispatchReceiver, reference.extensionReceiver)
@@ -259,4 +257,8 @@ class PropertyReferenceLowering(private val context: JsIrBackendContext) : BodyL
             }
         }
     }
+
+    companion object {
+        object PROPERTY_REFERENCE_FACTORY : IrDeclarationOriginImpl("PROPERTY_REFERNCE_FACTORY")
+    }
 }