diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/Dce.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/Dce.kt
index dbacb5ea384..acc9235204f 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/Dce.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/Dce.kt
@@ -35,6 +35,10 @@ fun eliminateDeadDeclarations(
     removeUselessDeclarations(module, usefulDeclarations)
 }
 
+private fun IrField.isConstant(): Boolean {
+    return correspondingPropertySymbol?.owner?.isConst ?: false
+}
+
 private fun buildRoots(module: IrModuleFragment, context: JsIrBackendContext, mainFunction: IrSimpleFunction?): Iterable<IrDeclaration> {
     val rootDeclarations =
         (module.files + context.packageLevelJsModules + context.externalPackageFragment.values).flatMapTo(mutableListOf()) { file ->
@@ -44,7 +48,7 @@ private fun buildRoots(module: IrModuleFragment, context: JsIrBackendContext, ma
                         || it.isEffectivelyExternal()
                         || it is IrField && it.correspondingPropertySymbol?.owner?.isExported(context) == true
                         || it is IrSimpleFunction && it.correspondingPropertySymbol?.owner?.isExported(context) == true
-            }
+            }.filter { !(it is IrField && it.isConstant() && !it.isExported(context)) }
         }
 
     if (context.hasTests) rootDeclarations += context.testContainer
diff --git a/libraries/stdlib/js-ir/runtime/coreRuntime.kt b/libraries/stdlib/js-ir/runtime/coreRuntime.kt
index 6aea2b16a27..3d178f3de4e 100644
--- a/libraries/stdlib/js-ir/runtime/coreRuntime.kt
+++ b/libraries/stdlib/js-ir/runtime/coreRuntime.kt
@@ -55,8 +55,8 @@ fun hashCode(obj: dynamic): Int {
     }
 }
 
-private var POW_2_32 = 4294967296.0
-private var OBJECT_HASH_CODE_PROPERTY_NAME = "kotlinHashCodeValue$"
+private const val POW_2_32 = 4294967296.0
+private const val OBJECT_HASH_CODE_PROPERTY_NAME = "kotlinHashCodeValue$"
 
 fun getObjectHashCode(obj: dynamic): Int {
     if (!jsIn(OBJECT_HASH_CODE_PROPERTY_NAME, obj)) {
diff --git a/libraries/stdlib/js-ir/runtime/longjs.kt b/libraries/stdlib/js-ir/runtime/longjs.kt
index 4a19044daab..f374bc40c0c 100644
--- a/libraries/stdlib/js-ir/runtime/longjs.kt
+++ b/libraries/stdlib/js-ir/runtime/longjs.kt
@@ -358,18 +358,18 @@ internal fun fromNumber(value: Double): Long {
     }
 }
 
-private val TWO_PWR_16_DBL_ = (1 shl 16).toDouble()
+private const val TWO_PWR_16_DBL_ = (1 shl 16).toDouble()
 
-private val TWO_PWR_24_DBL_ = (1 shl 24).toDouble()
+private const val TWO_PWR_24_DBL_ = (1 shl 24).toDouble()
 
 //private val TWO_PWR_32_DBL_ = TWO_PWR_16_DBL_ * TWO_PWR_16_DBL_
-private val TWO_PWR_32_DBL_ = (1 shl 16).toDouble() * (1 shl 16).toDouble()
+private const val TWO_PWR_32_DBL_ = (1 shl 16).toDouble() * (1 shl 16).toDouble()
 
 //private val TWO_PWR_64_DBL_ = TWO_PWR_32_DBL_ * TWO_PWR_32_DBL_
-private val TWO_PWR_64_DBL_ = ((1 shl 16).toDouble() * (1 shl 16).toDouble()) * ((1 shl 16).toDouble() * (1 shl 16).toDouble())
+private const val TWO_PWR_64_DBL_ = ((1 shl 16).toDouble() * (1 shl 16).toDouble()) * ((1 shl 16).toDouble() * (1 shl 16).toDouble())
 
 //private val TWO_PWR_63_DBL_ = TWO_PWR_64_DBL_ / 2
-private val TWO_PWR_63_DBL_ = (((1 shl 16).toDouble() * (1 shl 16).toDouble()) * ((1 shl 16).toDouble() * (1 shl 16).toDouble())) / 2
+private const val TWO_PWR_63_DBL_ = (((1 shl 16).toDouble() * (1 shl 16).toDouble()) * ((1 shl 16).toDouble() * (1 shl 16).toDouble())) / 2
 
 private val ZERO = fromInt(0)