[JS IR] Avoid name clashes for @JsQualifier-annotated declarations

#KT-42039 Fixed

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

@@ -6,13 +6,8 @@
 package org.jetbrains.kotlin.ir.backend.js.utils
 
 import org.jetbrains.kotlin.ir.IrElement
-import org.jetbrains.kotlin.ir.declarations.IrConstructor
-import org.jetbrains.kotlin.ir.declarations.IrDeclarationWithName
-import org.jetbrains.kotlin.ir.declarations.IrDeclarationBase
-import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
-import org.jetbrains.kotlin.ir.util.isEffectivelyExternal
-import org.jetbrains.kotlin.ir.util.isPropertyAccessor
-import org.jetbrains.kotlin.ir.util.isPropertyField
+import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.utils.addIfNotNull
@@ -76,14 +71,14 @@ class StableNamesCollector : IrElementVisitorVoid {
         val importedFromModuleOnly = declaration.isImportedFromModuleOnly()
 
         val jsName = declaration.getJsName()
-        val jsQualifier = declaration.getJsQualifier()
+        val jsQualifier = declaration.fileOrNull?.getJsQualifier()
 
         return when {
             importedFromModuleOnly ->
                 null
 
             jsQualifier != null ->
-                jsQualifier.split('1')[0]
+                jsQualifier.substringBefore('.')
 
             jsName != null ->
                 jsName

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrBoxJsES6TestGenerated.java

@@ -6061,6 +6061,11 @@ public class IrBoxJsES6TestGenerated extends AbstractIrBoxJsES6Test {
             runTest("js/js.translator/testData/box/nameClashes/jsNameAndPrivate.kt");
         }
 
+        @TestMetadata("jsQualifier.kt")
+        public void testJsQualifier() throws Exception {
+            runTest("js/js.translator/testData/box/nameClashes/jsQualifier.kt");
+        }
+
         @TestMetadata("localFunctionInLambda.kt")
         public void testLocalFunctionInLambda() throws Exception {
             runTest("js/js.translator/testData/box/nameClashes/localFunctionInLambda.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrBoxJsTestGenerated.java

@@ -6061,6 +6061,11 @@ public class IrBoxJsTestGenerated extends AbstractIrBoxJsTest {
             runTest("js/js.translator/testData/box/nameClashes/jsNameAndPrivate.kt");
         }
 
+        @TestMetadata("jsQualifier.kt")
+        public void testJsQualifier() throws Exception {
+            runTest("js/js.translator/testData/box/nameClashes/jsQualifier.kt");
+        }
+
         @TestMetadata("localFunctionInLambda.kt")
         public void testLocalFunctionInLambda() throws Exception {
             runTest("js/js.translator/testData/box/nameClashes/localFunctionInLambda.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -6071,6 +6071,11 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             runTest("js/js.translator/testData/box/nameClashes/jsNameAndPrivate.kt");
         }
 
+        @TestMetadata("jsQualifier.kt")
+        public void testJsQualifier() throws Exception {
+            runTest("js/js.translator/testData/box/nameClashes/jsQualifier.kt");
+        }
+
         @TestMetadata("localFunctionInLambda.kt")
         public void testLocalFunctionInLambda() throws Exception {
             runTest("js/js.translator/testData/box/nameClashes/localFunctionInLambda.kt");

js/js.translator/testData/box/nameClashes/jsQualifier.js

@@ -0,0 +1,7 @@
+var chopchop = {
+    foo: {
+        ok: function () {
+            return 'OK';
+        },
+    }
+};

js/js.translator/testData/box/nameClashes/jsQualifier.kt

@@ -0,0 +1,16 @@
+// MODULE: lib
+// FILE: lib.kt
+@file:JsQualifier("chopchop.foo")
+
+external fun ok(): String
+
+// MODULE: lib2
+// FILE: lib2.kt
+
+@JsExport
+fun chopchop() {}
+
+// MODULE: main(lib, lib2)
+// FILE: main.kt
+
+fun box() = ok()