diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt
index fe6f59293cc..ffb5425cc81 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt
@@ -27,24 +27,6 @@ import java.util.*
 import kotlin.collections.set
 import kotlin.math.abs
 
-// TODO remove direct usages of [mapToKey] from [NameTable] & co and move it to scripting & REPL infrastructure. Review usages.
-private fun <T> mapToKey(declaration: T): String {
-    return with(JsManglerIr) {
-        if (declaration is IrDeclaration) {
-            try {
-                declaration.hashedMangle(compatibleMode = false).toString()
-            } catch (e: Throwable) {
-                // FIXME: We can't mangle some local declarations. But
-                "wrong_key"
-            }
-        } else if (declaration is String) {
-            declaration.hashMangle.toString()
-        } else {
-            error("Key is not generated for " + declaration?.let { it::class.simpleName })
-        }
-    }
-}
-
 abstract class NameScope {
     abstract fun isReserved(name: String): Boolean
 
@@ -56,7 +38,6 @@ abstract class NameScope {
 class NameTable<T>(
     val parent: NameScope = EmptyScope,
     val reserved: MutableSet<String> = mutableSetOf(),
-    val mappedNames: MutableMap<String, String>? = null,
 ) : NameScope() {
     val names = mutableMapOf<T, String>()
 
@@ -69,7 +50,6 @@ class NameTable<T>(
     fun declareStableName(declaration: T, name: String) {
         names[declaration] = name
         reserved.add(name)
-        mappedNames?.set(mapToKey(declaration), name)
     }
 
     fun declareFreshName(declaration: T, suggestedName: String): String {
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/KotlinMangler.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/KotlinMangler.kt
index 8aca76934c4..7bcee62ca49 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/KotlinMangler.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/KotlinMangler.kt
@@ -72,7 +72,7 @@ interface KotlinMangler<D : Any> {
          * (depending on the target platform).
          *
          * The result of this function is only used for assigning names to binary symbols of Kotlin functions in the final executable
-         * produced by Kotlin/Native, and for generating stable names in the JavaScript code produced by Kotlin/JS.
+         * produced by Kotlin/Native.
          * **It does not affect klib ABI.**
          *
          * @param compatibleMode If `true`, the mangled names of property backing fields are just those fields' names.
@@ -80,16 +80,6 @@ interface KotlinMangler<D : Any> {
          */
         fun IrDeclaration.mangleString(compatibleMode: Boolean): String
 
-        /**
-         * Computes the hash code of the string returned by [mangleString] using the CityHash64 algorithm.
-         *
-         * **The result of this function does not affect klib ABI.**
-         *
-         * @param compatibleMode If `true`, the mangled names of property backing fields are just those fields' names.
-         * Otherwise, mangles such fields exactly as their corresponding properties.
-         */
-        fun IrDeclaration.hashedMangle(compatibleMode: Boolean): Long = mangleString(compatibleMode).hashMangle
-
         override val manglerName: String
             get() = "Ir"
     }