[JS IR BE] Fix codegen for external companion objects

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/MoveBodilessDeclarationsToSeparatePlace.kt

@@ -13,6 +13,7 @@ import org.jetbrains.kotlin.ir.backend.js.utils.getJsQualifier
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.symbols.IrExternalPackageFragmentSymbol
+import org.jetbrains.kotlin.ir.util.isClass
 import org.jetbrains.kotlin.ir.util.isEffectivelyExternal
 import org.jetbrains.kotlin.ir.util.transformFlat
 import org.jetbrains.kotlin.name.FqName
@@ -66,7 +67,7 @@ fun moveBodilessDeclarationsToSeparatePlace(context: JsIrBackendContext, module:
             externalClasses.flatMap { collectExternalClasses(it, true) }
 
         return if (includeCurrentLevel)
-            externalClasses + nestedExternalClasses
+            externalClasses.filter { it.isClass } + nestedExternalClasses
         else
             nestedExternalClasses
     }

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/calls/DynamicCallsTransformer.kt

@@ -57,7 +57,7 @@ class DynamicCallsTransformer(private val context: JsIrBackendContext) : CallsTr
         val symbol = call.symbol
         val function = call.symbol.owner
 
-        if (function.isDynamic() || function.isEffectivelyExternal()) {
+        if (function.isDynamic()) {
             when (call.origin) {
                 GET_PROPERTY -> {
                     val fieldSymbol = context.symbolTable.lazyWrapper.referenceField(

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrElementToJsExpressionTransformer.kt

@@ -140,7 +140,7 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
         if (function is IrSimpleFunction) {
             val property = function.correspondingProperty
             if (property != null && property.isEffectivelyExternal()) {
-                val nameRef = JsNameRef(property.name.identifier, jsDispatchReceiver)
+                val nameRef = JsNameRef(context.getNameForDeclaration(property), jsDispatchReceiver)
                 return when (function) {
                     property.getter -> nameRef
                     property.setter -> jsAssignment(nameRef, arguments.single())

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsGenerationContext.kt

@@ -45,7 +45,8 @@ class JsGenerationContext {
 
     fun getNameForDeclaration(declaration: IrDeclaration): JsName = when (declaration) {
         is IrSymbolOwner -> getNameForSymbol(declaration.symbol)
-        is IrProperty -> currentScope.declareName(declaration.name.identifier)
+        // Properties don't have symbols. Handling them separately:
+        is IrProperty -> currentScope.declareName(declaration.getJsName() ?: declaration.name.identifier)
         else -> error("Unsupported")
     }
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/SimpleNameGenerator.kt

@@ -117,8 +117,12 @@ class SimpleNameGenerator : NameGenerator {
                 if (declaration is IrConstructor) return@getOrPut getNameForDeclaration(declaration.parentAsClass, context)
 
                 if (declaration is IrClass && declaration.parent is IrClass) {
-                    val parentName = getNameForDeclaration(declaration.parentAsClass, context).ident
+                    val parentName = getNameForDeclaration(declaration.parentAsClass, context)
-                    return@getOrPut context.currentScope.declareFreshName(parentName + "$" + descriptorName.identifier)
+                    if (declaration.isCompanion) {
+                        // External companions are class references
+                        return@getOrPut parentName
+                    }
+                    return@getOrPut context.currentScope.declareFreshName(parentName.ident + "$" + descriptorName.identifier)
                 }
                 return@getOrPut context.staticContext.rootScope.declareName(descriptorName.identifier)
             }

js/js.translator/testData/box/native/accessToCompanionObjectFromInlineFun.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1281
 // FILE: main.kt
 

js/js.translator/testData/box/native/classObject.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1283
 package foo