fix(KT-49225): remove unnecessery boxing.

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

@@ -2110,6 +2110,11 @@ public class IrBoxJsES6TestGenerated extends AbstractIrBoxJsES6Test {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/export"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
         }
 
+        @TestMetadata("defaultInlineClassConstructorParam.kt")
+        public void testDefaultInlineClassConstructorParam() throws Exception {
+            runTest("js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt");
+        }
+
         @TestMetadata("exportAllFile.kt")
         public void testExportAllFile() throws Exception {
             runTest("js/js.translator/testData/box/export/exportAllFile.kt");

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

@@ -2105,6 +2105,11 @@ public class IrBoxJsTestGenerated extends AbstractIrBoxJsTest {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/export"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
         }
 
+        @TestMetadata("defaultInlineClassConstructorParam.kt")
+        public void testDefaultInlineClassConstructorParam() throws Exception {
+            runTest("js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt");
+        }
+
         @TestMetadata("exportAllFile.kt")
         public void testExportAllFile() throws Exception {
             runTest("js/js.translator/testData/box/export/exportAllFile.kt");

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

@@ -1780,6 +1780,11 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/export"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
         }
 
+        @TestMetadata("defaultInlineClassConstructorParam.kt")
+        public void testDefaultInlineClassConstructorParam() throws Exception {
+            runTest("js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt");
+        }
+
         @TestMetadata("exportAllFile.kt")
         public void testExportAllFile() throws Exception {
             runTest("js/js.translator/testData/box/export/exportAllFile.kt");

js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt

@@ -0,0 +1,16 @@
+// KT-49225
+// RUN_PLAIN_BOX_FUNCTION
+// IGNORE_BACKEND: JS
+
+// MODULE: lib
+// FILE: lib.kt
+value class Koo(val koo: String = "OK")
+
+@JsExport
+class Bar(val koo: Koo = Koo())
+
+// MODULE: main(lib)
+// FILE: main.js
+function box() {
+    return new main.Bar().koo;
+}