JS: allow to inherit external class from kotlin.Throwable. See KT-15336

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/diagnostics/JsExternalChecker.kt

@@ -28,10 +28,7 @@ import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCall
 import org.jetbrains.kotlin.resolve.checkers.SimpleDeclarationChecker
-import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
-import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperClassNotAny
-import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperInterfaces
-import org.jetbrains.kotlin.resolve.descriptorUtil.isExtension
+import org.jetbrains.kotlin.resolve.descriptorUtil.*
 import org.jetbrains.kotlin.types.TypeUtils
 import org.jetbrains.kotlin.utils.singletonOrEmptyList
 
@@ -78,7 +75,7 @@ object JsExternalChecker : SimpleDeclarationChecker {
             if (descriptor.kind == ClassKind.ENUM_CLASS || descriptor.kind == ClassKind.ENUM_ENTRY) {
                 superClasses.removeAll { it.fqNameUnsafe == KotlinBuiltIns.FQ_NAMES._enum }
             }
-            if (superClasses.any { !AnnotationsUtils.isNativeObject(it) }) {
+            if (superClasses.any { !AnnotationsUtils.isNativeObject(it) && it.fqNameSafe != KotlinBuiltIns.FQ_NAMES.throwable }) {
                 diagnosticHolder.report(ErrorsJs.EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE.on(declaration))
             }
         }

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

@@ -5807,6 +5807,12 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             doTest(fileName);
         }
 
+        @TestMetadata("exception.kt")
+        public void testException() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/native/exception.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("inheritanceFromNativeClass.kt")
         public void testInheritanceFromNativeClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/native/inheritanceFromNativeClass.kt");

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

@@ -0,0 +1,11 @@
+external class TypeError(message: String?, fileName: String? = definedExternally, lineNumber: Int? = definedExternally) : Throwable
+
+fun box(): String {
+    try {
+        js("null.foo()")
+        return "fail: expected exception not thrown"
+    }
+    catch (e: TypeError) {
+        return "OK"
+    }
+}