diff --git a/compiler/testData/codegen/box/annotations/instances/multiplatformInstantiation.kt b/compiler/testData/codegen/box/annotations/instances/multiplatformInstantiation.kt
index 053accc82e4..8c45eb20e73 100644
--- a/compiler/testData/codegen/box/annotations/instances/multiplatformInstantiation.kt
+++ b/compiler/testData/codegen/box/annotations/instances/multiplatformInstantiation.kt
@@ -1,8 +1,8 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: expect/actual in the same module (ACTUAL_WITHOUT_EXPECT)
 // IGNORE_BACKEND: JVM
 
-// (supported: JVM_IR, JS_IR(_E6))
+// (supported: JVM_IR, JS_IR(_ES6))
 
 // WITH_STDLIB
 // !LANGUAGE: +InstantiationOfAnnotationClasses +MultiPlatformProjects
diff --git a/compiler/testData/codegen/box/binaryOp/boxingOfLiteralReceiverWithIntegerValueType.kt b/compiler/testData/codegen/box/binaryOp/boxingOfLiteralReceiverWithIntegerValueType.kt
index f1098711361..1d688fdd908 100644
--- a/compiler/testData/codegen/box/binaryOp/boxingOfLiteralReceiverWithIntegerValueType.kt
+++ b/compiler/testData/codegen/box/binaryOp/boxingOfLiteralReceiverWithIntegerValueType.kt
@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 // WITH_STDLIB
 // This test exists only to check that we don't accidentally break the buggy behavior of the old JVM backend in JVM IR (KT-42321).
diff --git a/compiler/testData/codegen/box/binaryOp/call.kt b/compiler/testData/codegen/box/binaryOp/call.kt
index 914cb50c021..80d93e65748 100644
--- a/compiler/testData/codegen/box/binaryOp/call.kt
+++ b/compiler/testData/codegen/box/binaryOp/call.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 
 fun box(): String {
diff --git a/compiler/testData/codegen/box/binaryOp/callNullable.kt b/compiler/testData/codegen/box/binaryOp/callNullable.kt
index 1ef8f659ccc..3efe84d6a3e 100644
--- a/compiler/testData/codegen/box/binaryOp/callNullable.kt
+++ b/compiler/testData/codegen/box/binaryOp/callNullable.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 
 fun box(): String {
diff --git a/compiler/testData/codegen/box/binaryOp/intrinsic.kt b/compiler/testData/codegen/box/binaryOp/intrinsic.kt
index c9932d6efd4..8b660c7fe33 100644
--- a/compiler/testData/codegen/box/binaryOp/intrinsic.kt
+++ b/compiler/testData/codegen/box/binaryOp/intrinsic.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 
 fun box(): String {
diff --git a/compiler/testData/codegen/box/binaryOp/intrinsicNullable.kt b/compiler/testData/codegen/box/binaryOp/intrinsicNullable.kt
index 2a995ebc8a0..eb9e30dc462 100644
--- a/compiler/testData/codegen/box/binaryOp/intrinsicNullable.kt
+++ b/compiler/testData/codegen/box/binaryOp/intrinsicNullable.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 
 fun box(): String {
diff --git a/compiler/testData/codegen/box/bridges/fakeOverrideFromInterfaceThroughIntermediateClass.kt b/compiler/testData/codegen/box/bridges/fakeOverrideFromInterfaceThroughIntermediateClass.kt
index 2055385270f..73ff55fb166 100644
--- a/compiler/testData/codegen/box/bridges/fakeOverrideFromInterfaceThroughIntermediateClass.kt
+++ b/compiler/testData/codegen/box/bridges/fakeOverrideFromInterfaceThroughIntermediateClass.kt
@@ -1,5 +1,5 @@
 // !LANGUAGE: -AbstractClassMemberNotImplementedWithIntermediateAbstractClass
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: don't support legacy feature
 
 interface A {
diff --git a/compiler/testData/codegen/box/bridges/fakeOverrideMultiFile.kt b/compiler/testData/codegen/box/bridges/fakeOverrideMultiFile.kt
index fab06d1c8ab..70a07d47b8d 100644
--- a/compiler/testData/codegen/box/bridges/fakeOverrideMultiFile.kt
+++ b/compiler/testData/codegen/box/bridges/fakeOverrideMultiFile.kt
@@ -1,5 +1,5 @@
 // !LANGUAGE: -AbstractClassMemberNotImplementedWithIntermediateAbstractClass
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: don't support legacy feature
 
 // FILE: 1.kt
diff --git a/compiler/testData/codegen/box/checkcastOptimization/kt47851.kt b/compiler/testData/codegen/box/checkcastOptimization/kt47851.kt
index 184482d1a7b..b46b5396bbb 100644
--- a/compiler/testData/codegen/box/checkcastOptimization/kt47851.kt
+++ b/compiler/testData/codegen/box/checkcastOptimization/kt47851.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: result.getMethod OK in FE1.0, unresolved in FIR
 
 class C(val value: String) {
diff --git a/compiler/testData/codegen/box/coroutines/featureIntersection/defaultExpect.kt b/compiler/testData/codegen/box/coroutines/featureIntersection/defaultExpect.kt
index 54d6a26cc3e..180d6118993 100644
--- a/compiler/testData/codegen/box/coroutines/featureIntersection/defaultExpect.kt
+++ b/compiler/testData/codegen/box/coroutines/featureIntersection/defaultExpect.kt
@@ -1,6 +1,6 @@
 // !LANGUAGE: +MultiPlatformProjects
 // WITH_STDLIB
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: expect/actual in the same module (ACTUAL_WITHOUT_EXPECT)
 
 import kotlin.coroutines.*
diff --git a/compiler/testData/codegen/box/defaultArguments/useNextParamInLambdaTailrec.kt b/compiler/testData/codegen/box/defaultArguments/useNextParamInLambdaTailrec.kt
index bc1a7e28495..2bcdb775b8b 100644
--- a/compiler/testData/codegen/box/defaultArguments/useNextParamInLambdaTailrec.kt
+++ b/compiler/testData/codegen/box/defaultArguments/useNextParamInLambdaTailrec.kt
@@ -1,6 +1,6 @@
 // LANGUAGE: -ProhibitIllegalValueParameterUsageInDefaultArguments
 // IGNORE_BACKEND: JVM
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: don't support legacy feature. UNINITIALIZED_PARAMETER y. See KT-49800
 tailrec fun foo(x: () -> String? = { y }, y: String = "fail"): String? {
     if (y == "start")
diff --git a/compiler/testData/codegen/box/enum/enumEntriesMultimodule.kt b/compiler/testData/codegen/box/enum/enumEntriesMultimodule.kt
index d6992384797..087380a8e6c 100644
--- a/compiler/testData/codegen/box/enum/enumEntriesMultimodule.kt
+++ b/compiler/testData/codegen/box/enum/enumEntriesMultimodule.kt
@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM_IR
-// AFTER KT-53649 - TARGET_BACKEND: NATIVE, JS_IR
+// AFTER KT-53649 - TARGET_BACKEND: NATIVE, JS_IR, JS_IR_ES6
 // WITH_STDLIB
 
 // MODULE: lib
diff --git a/compiler/testData/codegen/box/enum/enumEntriesMultimoduleMultipleMappings.kt b/compiler/testData/codegen/box/enum/enumEntriesMultimoduleMultipleMappings.kt
index 64092d468a7..cfa88843526 100644
--- a/compiler/testData/codegen/box/enum/enumEntriesMultimoduleMultipleMappings.kt
+++ b/compiler/testData/codegen/box/enum/enumEntriesMultimoduleMultipleMappings.kt
@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM_IR
-// AFTER KT-53649 - TARGET_BACKEND: NATIVE, JS_IR
+// AFTER KT-53649 - TARGET_BACKEND: NATIVE, JS_IR, JS_IR_ES6
 // WITH_STDLIB
 
 // MODULE: lib
diff --git a/compiler/testData/codegen/box/enum/enumEntriesMultimoduleMultipleMappingsForMultipleClassfiles.kt b/compiler/testData/codegen/box/enum/enumEntriesMultimoduleMultipleMappingsForMultipleClassfiles.kt
index 50201143a90..2c0828a80b6 100644
--- a/compiler/testData/codegen/box/enum/enumEntriesMultimoduleMultipleMappingsForMultipleClassfiles.kt
+++ b/compiler/testData/codegen/box/enum/enumEntriesMultimoduleMultipleMappingsForMultipleClassfiles.kt
@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM_IR
-// AFTER KT-53649 - TARGET_BACKEND: NATIVE, JS_IR
+// AFTER KT-53649 - TARGET_BACKEND: NATIVE, JS_IR, JS_IR_ES6
 // WITH_STDLIB
 
 // MODULE: lib
diff --git a/compiler/testData/codegen/box/enum/nameClashWithCompanion.kt b/compiler/testData/codegen/box/enum/nameClashWithCompanion.kt
index d7824bf55c1..b648473c8cd 100644
--- a/compiler/testData/codegen/box/enum/nameClashWithCompanion.kt
+++ b/compiler/testData/codegen/box/enum/nameClashWithCompanion.kt
@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: don't support legacy feature (see https://youtrack.jetbrains.com/issue/KT-37591). UNRESOLVED_REFERENCE at '+'
 // WITH_STDLIB
 // MODULE: lib
diff --git a/compiler/testData/codegen/box/evaluate/intrinsics.kt b/compiler/testData/codegen/box/evaluate/intrinsics.kt
index 349285421f4..59cb9f28e9a 100644
--- a/compiler/testData/codegen/box/evaluate/intrinsics.kt
+++ b/compiler/testData/codegen/box/evaluate/intrinsics.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 // TARGET_BACKEND: JVM
 
diff --git a/compiler/testData/codegen/box/evaluate/minus.kt b/compiler/testData/codegen/box/evaluate/minus.kt
index 26a6ff1bae0..6e6fecd5a10 100644
--- a/compiler/testData/codegen/box/evaluate/minus.kt
+++ b/compiler/testData/codegen/box/evaluate/minus.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 // TARGET_BACKEND: JVM
 
diff --git a/compiler/testData/codegen/box/evaluate/multiply.kt b/compiler/testData/codegen/box/evaluate/multiply.kt
index 075117e586b..cf4ecaecc78 100644
--- a/compiler/testData/codegen/box/evaluate/multiply.kt
+++ b/compiler/testData/codegen/box/evaluate/multiply.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 // TARGET_BACKEND: JVM
 
diff --git a/compiler/testData/codegen/box/evaluate/parenthesized.kt b/compiler/testData/codegen/box/evaluate/parenthesized.kt
index 8dd7d61cde2..1f7b3e19ca0 100644
--- a/compiler/testData/codegen/box/evaluate/parenthesized.kt
+++ b/compiler/testData/codegen/box/evaluate/parenthesized.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 // TARGET_BACKEND: JVM
 
diff --git a/compiler/testData/codegen/box/evaluate/plus.kt b/compiler/testData/codegen/box/evaluate/plus.kt
index d3af25a4313..22c0732d6f7 100644
--- a/compiler/testData/codegen/box/evaluate/plus.kt
+++ b/compiler/testData/codegen/box/evaluate/plus.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 // TARGET_BACKEND: JVM
 
diff --git a/compiler/testData/codegen/box/evaluate/rem.kt b/compiler/testData/codegen/box/evaluate/rem.kt
index 580a691e37f..6b642ad381a 100644
--- a/compiler/testData/codegen/box/evaluate/rem.kt
+++ b/compiler/testData/codegen/box/evaluate/rem.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 // TARGET_BACKEND: JVM
 
diff --git a/compiler/testData/codegen/box/fullJdk/kt46540.kt b/compiler/testData/codegen/box/fullJdk/kt46540.kt
index a2ec57631f8..13893bf7dfa 100644
--- a/compiler/testData/codegen/box/fullJdk/kt46540.kt
+++ b/compiler/testData/codegen/box/fullJdk/kt46540.kt
@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 // SKIP_JDK6
 // FULL_JDK
diff --git a/compiler/testData/codegen/box/inference/builderInference/cstBasedOnTwoBuilderInferenceLambda.kt b/compiler/testData/codegen/box/inference/builderInference/cstBasedOnTwoBuilderInferenceLambda.kt
index 9d6ec25df6f..cf1a0e916a4 100644
--- a/compiler/testData/codegen/box/inference/builderInference/cstBasedOnTwoBuilderInferenceLambda.kt
+++ b/compiler/testData/codegen/box/inference/builderInference/cstBasedOnTwoBuilderInferenceLambda.kt
@@ -1,6 +1,6 @@
 // WITH_STDLIB
 // IGNORE_BACKEND: WASM
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE
 // FIR status: ARGUMENT_TYPE_MISMATCH at contribute arguments
 // TARGET_BACKEND: JVM
 
diff --git a/compiler/testData/codegen/box/inference/builderInference/memberScope.kt b/compiler/testData/codegen/box/inference/builderInference/memberScope.kt
index 7762e81f7f9..470ec7e867e 100644
--- a/compiler/testData/codegen/box/inference/builderInference/memberScope.kt
+++ b/compiler/testData/codegen/box/inference/builderInference/memberScope.kt
@@ -1,7 +1,7 @@
 // !LANGUAGE: +UnrestrictedBuilderInference
 // !DIAGNOSTICS: -DEPRECATION -OPT_IN_IS_NOT_ENABLED
 // WITH_STDLIB
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: NONE_APPLICABLE at all equals calls
 import kotlin.experimental.ExperimentalTypeInference
 
diff --git a/compiler/testData/codegen/box/inference/builderInference/specialCallsWithCallableReferences.kt b/compiler/testData/codegen/box/inference/builderInference/specialCallsWithCallableReferences.kt
index c9e14ecacd1..d839dea87f3 100644
--- a/compiler/testData/codegen/box/inference/builderInference/specialCallsWithCallableReferences.kt
+++ b/compiler/testData/codegen/box/inference/builderInference/specialCallsWithCallableReferences.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: Disabling of StrictOnlyInputTypesChecks is not supported by FIR
 // WITH_STDLIB
 // !LANGUAGE: -StrictOnlyInputTypesChecks
diff --git a/compiler/testData/codegen/box/inference/builderInference/specialCallsWithCallableReferencesErrorType.kt b/compiler/testData/codegen/box/inference/builderInference/specialCallsWithCallableReferencesErrorType.kt
index c9e14ecacd1..d839dea87f3 100644
--- a/compiler/testData/codegen/box/inference/builderInference/specialCallsWithCallableReferencesErrorType.kt
+++ b/compiler/testData/codegen/box/inference/builderInference/specialCallsWithCallableReferencesErrorType.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: Disabling of StrictOnlyInputTypesChecks is not supported by FIR
 // WITH_STDLIB
 // !LANGUAGE: -StrictOnlyInputTypesChecks
diff --git a/compiler/testData/codegen/box/inference/builderInference/withExpectedType.kt b/compiler/testData/codegen/box/inference/builderInference/withExpectedType.kt
index 3de5a5bef1c..ab8fcd0963b 100644
--- a/compiler/testData/codegen/box/inference/builderInference/withExpectedType.kt
+++ b/compiler/testData/codegen/box/inference/builderInference/withExpectedType.kt
@@ -1,7 +1,7 @@
 // !LANGUAGE: +UnrestrictedBuilderInference -UseBuilderInferenceOnlyIfNeeded
 // WITH_STDLIB
 // !DIAGNOSTICS: -OPT_IN_USAGE_ERROR -CAST_NEVER_SUCCEEDS
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, WASM
 // FIR status: Initializer type mismatch at first val x = : expected kotlin/collections/MutableList<kotlin/CharSequence>, actual kotlin/collections/MutableList<kotlin/String>
 
 import kotlin.experimental.ExperimentalTypeInference
diff --git a/compiler/testData/codegen/box/inference/noNothingValueInsideSpecialCall.kt b/compiler/testData/codegen/box/inference/noNothingValueInsideSpecialCall.kt
index 25fcfba9c78..7ac43126db1 100644
--- a/compiler/testData/codegen/box/inference/noNothingValueInsideSpecialCall.kt
+++ b/compiler/testData/codegen/box/inference/noNothingValueInsideSpecialCall.kt
@@ -1,6 +1,6 @@
 // WITH_REFLECT
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE
 // FIR status: KotlinNothingValueException from create()
 
 fun <T : A> create(modelClass: Class<T>): T {
diff --git a/compiler/testData/codegen/box/inference/specialCallsWithCallableReferences.kt b/compiler/testData/codegen/box/inference/specialCallsWithCallableReferences.kt
index 03294afa046..b3e56b03504 100644
--- a/compiler/testData/codegen/box/inference/specialCallsWithCallableReferences.kt
+++ b/compiler/testData/codegen/box/inference/specialCallsWithCallableReferences.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: Disabling of StrictOnlyInputTypesChecks is not supported by FIR
 // WITH_STDLIB
 // SKIP_TXT
diff --git a/compiler/testData/codegen/box/multiplatform/defaultArguments/functionFromOtherModule.kt b/compiler/testData/codegen/box/multiplatform/defaultArguments/functionFromOtherModule.kt
index 7f8ec9b7f42..92f78e9ddb1 100644
--- a/compiler/testData/codegen/box/multiplatform/defaultArguments/functionFromOtherModule.kt
+++ b/compiler/testData/codegen/box/multiplatform/defaultArguments/functionFromOtherModule.kt
@@ -1,5 +1,5 @@
 // !LANGUAGE: +MultiPlatformProjects
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: expect/actual in the same module
 // WITH_STDLIB
 // MODULE: lib
diff --git a/compiler/testData/codegen/box/multiplatform/defaultArguments/withTypeParameter.kt b/compiler/testData/codegen/box/multiplatform/defaultArguments/withTypeParameter.kt
index 526400b6e68..81307ed9175 100644
--- a/compiler/testData/codegen/box/multiplatform/defaultArguments/withTypeParameter.kt
+++ b/compiler/testData/codegen/box/multiplatform/defaultArguments/withTypeParameter.kt
@@ -1,5 +1,5 @@
 // !LANGUAGE: +MultiPlatformProjects
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: outdated code (expect/actual in the same module)
 // WITH_STDLIB
 // MODULE: lib
diff --git a/compiler/testData/codegen/box/multiplatform/optionalExpectation.kt b/compiler/testData/codegen/box/multiplatform/optionalExpectation.kt
index c8a7618e9b9..21f97f4cf7d 100644
--- a/compiler/testData/codegen/box/multiplatform/optionalExpectation.kt
+++ b/compiler/testData/codegen/box/multiplatform/optionalExpectation.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: expect/actual in the same module (ACTUAL_WITHOUT_EXPECT)
 // !LANGUAGE: +MultiPlatformProjects
 // !OPT_IN: kotlin.ExperimentalMultiplatform
diff --git a/compiler/testData/codegen/box/operatorConventions/kt39880.kt b/compiler/testData/codegen/box/operatorConventions/kt39880.kt
index 6cea1a4e86d..faf7e615cd4 100644
--- a/compiler/testData/codegen/box/operatorConventions/kt39880.kt
+++ b/compiler/testData/codegen/box/operatorConventions/kt39880.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: Disabling of StrictOnlyInputTypesChecks is not supported by FIR
 // WITH_STDLIB
 // !LANGUAGE: -StrictOnlyInputTypesChecks
diff --git a/compiler/testData/codegen/box/operatorConventions/kt42722.kt b/compiler/testData/codegen/box/operatorConventions/kt42722.kt
index e5682dbf17e..7795cfbc346 100644
--- a/compiler/testData/codegen/box/operatorConventions/kt42722.kt
+++ b/compiler/testData/codegen/box/operatorConventions/kt42722.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: Disabling of StrictOnlyInputTypesChecks is not supported by FIR
 // WITH_STDLIB
 // !LANGUAGE: -StrictOnlyInputTypesChecks
diff --git a/compiler/testData/codegen/box/sam/adapters/operators/legacyModOperator.kt b/compiler/testData/codegen/box/sam/adapters/operators/legacyModOperator.kt
index 0403f025067..127bbd8bd2d 100644
--- a/compiler/testData/codegen/box/sam/adapters/operators/legacyModOperator.kt
+++ b/compiler/testData/codegen/box/sam/adapters/operators/legacyModOperator.kt
@@ -1,6 +1,6 @@
 // TARGET_BACKEND: JVM
 // !LANGUAGE: -ProhibitOperatorMod
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: don't support legacy feature
 // MODULE: lib
 // FILE: Java.java
diff --git a/compiler/testData/codegen/box/sam/arrayAsVarargAfterSamArgument.kt b/compiler/testData/codegen/box/sam/arrayAsVarargAfterSamArgument.kt
index 7906eb1a11a..7b019fb4720 100644
--- a/compiler/testData/codegen/box/sam/arrayAsVarargAfterSamArgument.kt
+++ b/compiler/testData/codegen/box/sam/arrayAsVarargAfterSamArgument.kt
@@ -1,5 +1,5 @@
 // !LANGUAGE: -ProhibitVarargAsArrayAfterSamArgument
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: don't support legacy feature
 // TARGET_BACKEND: JVM
 
diff --git a/compiler/testData/codegen/box/script/classReference.kt b/compiler/testData/codegen/box/script/classReference.kt
index c90b2a38ea4..b9c20f90ef7 100644
--- a/compiler/testData/codegen/box/script/classReference.kt
+++ b/compiler/testData/codegen/box/script/classReference.kt
@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: scripts aren't supported yet
 // IGNORE_LIGHT_ANALYSIS
 // WITH_STDLIB
diff --git a/compiler/testData/codegen/box/script/localCaptureTests.kt b/compiler/testData/codegen/box/script/localCaptureTests.kt
index 34fdd7000fc..894ee557461 100644
--- a/compiler/testData/codegen/box/script/localCaptureTests.kt
+++ b/compiler/testData/codegen/box/script/localCaptureTests.kt
@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: scripts aren't supported yet
 // IGNORE_LIGHT_ANALYSIS
 // WITH_STDLIB
diff --git a/compiler/testData/codegen/box/script/scripInstance.kt b/compiler/testData/codegen/box/script/scripInstance.kt
index fb6e463f76e..30e77e08c4d 100644
--- a/compiler/testData/codegen/box/script/scripInstance.kt
+++ b/compiler/testData/codegen/box/script/scripInstance.kt
@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: scripts aren't supported yet
 // IGNORE_LIGHT_ANALYSIS
 // WITH_STDLIB
diff --git a/compiler/testData/codegen/box/script/scriptNestedClassInstance.kt b/compiler/testData/codegen/box/script/scriptNestedClassInstance.kt
index b0b0bb906cd..e8ad069d93d 100644
--- a/compiler/testData/codegen/box/script/scriptNestedClassInstance.kt
+++ b/compiler/testData/codegen/box/script/scriptNestedClassInstance.kt
@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6
 // FIR status: scripts aren't supported yet
 // IGNORE_LIGHT_ANALYSIS
 // WITH_STDLIB
diff --git a/compiler/testData/codegen/box/unaryOp/call.kt b/compiler/testData/codegen/box/unaryOp/call.kt
index fc19eb853e3..c1de6c95f3f 100644
--- a/compiler/testData/codegen/box/unaryOp/call.kt
+++ b/compiler/testData/codegen/box/unaryOp/call.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 
 fun box(): String {
diff --git a/compiler/testData/codegen/box/unaryOp/callNullable.kt b/compiler/testData/codegen/box/unaryOp/callNullable.kt
index 0906ac8812b..883565d137c 100644
--- a/compiler/testData/codegen/box/unaryOp/callNullable.kt
+++ b/compiler/testData/codegen/box/unaryOp/callNullable.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: KT-46419, ILT conversions to Byte and Short are not supported by design
 
 fun box(): String {
diff --git a/compiler/testData/codegen/box/vararg/singleAssignmentToVarargsInFunction.kt b/compiler/testData/codegen/box/vararg/singleAssignmentToVarargsInFunction.kt
index 9374f60e046..8927de52589 100644
--- a/compiler/testData/codegen/box/vararg/singleAssignmentToVarargsInFunction.kt
+++ b/compiler/testData/codegen/box/vararg/singleAssignmentToVarargsInFunction.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, WASM
 // !LANGUAGE: -ProhibitAssigningSingleElementsToVarargsInNamedForm -AllowAssigningArrayElementsToVarargsInNamedFormForFunctions
 // FIR status: don't support legacy feature
 
diff --git a/compiler/testData/codegen/box/when/exhaustiveBoolean.kt b/compiler/testData/codegen/box/when/exhaustiveBoolean.kt
index 0a7f2b79c32..a72d4c5dcfb 100644
--- a/compiler/testData/codegen/box/when/exhaustiveBoolean.kt
+++ b/compiler/testData/codegen/box/when/exhaustiveBoolean.kt
@@ -1,5 +1,5 @@
 // LANGUAGE: -ProhibitSimplificationOfNonTrivialConstBooleanExpressions
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // FIR status: don't support legacy feature
 fun box() : String = when (true) {
     ((true)) -> "OK"
diff --git a/compiler/testData/codegen/boxInline/argumentOrder/defaultParametersAndLastVararg.kt b/compiler/testData/codegen/boxInline/argumentOrder/defaultParametersAndLastVararg.kt
index 39ac4388edb..535e6054e99 100644
--- a/compiler/testData/codegen/boxInline/argumentOrder/defaultParametersAndLastVararg.kt
+++ b/compiler/testData/codegen/boxInline/argumentOrder/defaultParametersAndLastVararg.kt
@@ -1,7 +1,7 @@
 // WITH_STDLIB
 // !LANGUAGE: -UseCorrectExecutionOrderForVarargArguments
 // IGNORE_BACKEND: JS
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, WASM
 // IGNORE_BACKEND_K2_MULTI_MODULE: JVM_IR JVM_IR_SERIALIZE
 // NO_CHECK_LAMBDA_INLINING
 // KJS_WITH_FULL_RUNTIME
diff --git a/compiler/testData/codegen/boxInline/nonLocalReturns/kt9304.kt b/compiler/testData/codegen/boxInline/nonLocalReturns/kt9304.kt
index fb8d0a24810..08f13722c8c 100644
--- a/compiler/testData/codegen/boxInline/nonLocalReturns/kt9304.kt
+++ b/compiler/testData/codegen/boxInline/nonLocalReturns/kt9304.kt
@@ -1,6 +1,6 @@
 // IGNORE_BACKEND: JVM
 // IGNORE_BACKEND_MULTI_MODULE: JVM, JVM_MULTI_MODULE_OLD_AGAINST_IR
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // IGNORE_BACKEND_K2_MULTI_MODULE: JVM_IR JVM_IR_SERIALIZE
 // NO_CHECK_LAMBDA_INLINING
 // FILE: 1.kt
diff --git a/compiler/testData/codegen/boxInline/syntheticAccessors/superCall.kt b/compiler/testData/codegen/boxInline/syntheticAccessors/superCall.kt
index 18c4a3ea073..60f4f6253ef 100644
--- a/compiler/testData/codegen/boxInline/syntheticAccessors/superCall.kt
+++ b/compiler/testData/codegen/boxInline/syntheticAccessors/superCall.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // IGNORE_BACKEND_K2_MULTI_MODULE: JVM_IR JVM_IR_SERIALIZE NATIVE
 // !LANGUAGE: -ProhibitSuperCallsFromPublicInline
 // FILE: 1.kt
diff --git a/compiler/testData/codegen/boxInline/syntheticAccessors/superCallFromMultipleSubclasses.kt b/compiler/testData/codegen/boxInline/syntheticAccessors/superCallFromMultipleSubclasses.kt
index 953e697d4f7..360762c0c2e 100644
--- a/compiler/testData/codegen/boxInline/syntheticAccessors/superCallFromMultipleSubclasses.kt
+++ b/compiler/testData/codegen/boxInline/syntheticAccessors/superCallFromMultipleSubclasses.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // IGNORE_BACKEND_K2_MULTI_MODULE: JVM_IR JVM_IR_SERIALIZE NATIVE
 // !LANGUAGE: -ProhibitSuperCallsFromPublicInline
 // FILE: 1.kt
diff --git a/compiler/testData/codegen/boxInline/syntheticAccessors/superProperty.kt b/compiler/testData/codegen/boxInline/syntheticAccessors/superProperty.kt
index 80375f0de1a..6d0f33eff18 100644
--- a/compiler/testData/codegen/boxInline/syntheticAccessors/superProperty.kt
+++ b/compiler/testData/codegen/boxInline/syntheticAccessors/superProperty.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
+// IGNORE_BACKEND_K2: JVM_IR, JS_IR, JS_IR_ES6, NATIVE, WASM
 // IGNORE_BACKEND_K2_MULTI_MODULE: JVM_IR JVM_IR_SERIALIZE NATIVE
 // !LANGUAGE: -ProhibitSuperCallsFromPublicInline
 // FILE: 1.kt
diff --git a/compiler/testData/codegen/boxWasmJsInterop/functionTypes.kt b/compiler/testData/codegen/boxWasmJsInterop/functionTypes.kt
index d9d7b218c29..8e4c2ec2f24 100644
--- a/compiler/testData/codegen/boxWasmJsInterop/functionTypes.kt
+++ b/compiler/testData/codegen/boxWasmJsInterop/functionTypes.kt
@@ -1,5 +1,5 @@
 // Char issues
-// IGNORE_BACKEND: JS_IR
+// IGNORE_BACKEND: JS_IR, JS_IR_ES6
 
 // MODULE: main
 // FILE: externals.js
diff --git a/compiler/testData/codegen/boxWasmJsInterop/jsToKotlinAdapters.kt b/compiler/testData/codegen/boxWasmJsInterop/jsToKotlinAdapters.kt
index 30816ce4f8f..ebe7a81c434 100644
--- a/compiler/testData/codegen/boxWasmJsInterop/jsToKotlinAdapters.kt
+++ b/compiler/testData/codegen/boxWasmJsInterop/jsToKotlinAdapters.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND: JS_IR, JS
+// IGNORE_BACKEND: JS_IR, JS_IR_ES6, JS
 
 inline fun checkNPE(body: () -> Unit) {
     var throwed = false
diff --git a/compiler/testData/codegen/boxWasmJsInterop/nameClash.kt b/compiler/testData/codegen/boxWasmJsInterop/nameClash.kt
index fba82b665d3..4784b579f90 100644
--- a/compiler/testData/codegen/boxWasmJsInterop/nameClash.kt
+++ b/compiler/testData/codegen/boxWasmJsInterop/nameClash.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND: JS_IR, JS
+// IGNORE_BACKEND: JS_IR, JS_IR_ES6, JS
 // FILE: file1.kt
 @JsFun("() => 42")
 private external fun clashName(): Int