JS: when RHS of as cast is non-nullable native interface, check LHS for null

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestWithJsStdLibGenerated.java

@@ -724,7 +724,7 @@ public class DiagnosticsTestWithJsStdLibGenerated extends AbstractDiagnosticsTes
         @RunWith(JUnit3RunnerWithInners.class)
         public static class Rtti extends AbstractDiagnosticsTestWithJsStdLib {
             public void testAllFilesPresentInRtti() throws Exception {
-                KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/diagnostics/testsWithJsStdLib/native/rtti"), Pattern.compile("^(.+)\\.kt$"), true);
+                KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/diagnostics/testsWithJsStdLib/native/rtti"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.ANY, true);
             }
 
             @TestMetadata("castToNativeInterface.kt")

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

@@ -5504,6 +5504,18 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             doTest(fileName);
         }
 
+        @TestMetadata("castToNativeInterfaceChecked.kt")
+        public void testCastToNativeInterfaceChecked() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/native/castToNativeInterfaceChecked.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("castToNullableNativeInterface.kt")
+        public void testCastToNullableNativeInterface() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/native/castToNullableNativeInterface.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("castToTypeParamBoundedByNativeInterface.kt")
         public void testCastToTypeParamBoundedByNativeInterface() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/native/castToTypeParamBoundedByNativeInterface.kt");
@@ -5648,6 +5660,12 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             doTest(fileName);
         }
 
+        @TestMetadata("safeCastToNativeInterface.kt")
+        public void testSafeCastToNativeInterface() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/native/safeCastToNativeInterface.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("secondaryConstructor.kt")
         public void testSecondaryConstructor() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/native/secondaryConstructor.kt");

js/js.translator/src/org/jetbrains/kotlin/js/translate/expression/PatternTranslator.java

@@ -159,7 +159,7 @@ public final class PatternTranslator extends AbstractTranslator {
     private JsExpression doGetIsTypeCheckCallable(@NotNull KotlinType type) {
         ClassifierDescriptor targetDescriptor = type.getConstructor().getDeclarationDescriptor();
         if (targetDescriptor != null && AnnotationsUtils.isNativeInterface(targetDescriptor)) {
-            return null;
+            return type.isMarkedNullable() ? null : namer().isAny();
         }
 
         JsExpression builtinCheck = getIsTypeCheckCallableForBuiltin(type);

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

@@ -0,0 +1,15 @@
+@native interface I {
+    fun foo(): String
+}
+
+fun createObject(): Any? = null
+
+fun box(): String {
+    try {
+        (createObject() as I).foo()
+        return "fail: exception not thrown"
+    }
+    catch (e: ClassCastException) {
+        return "OK"
+    }
+}

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

@@ -0,0 +1,10 @@
+@native interface I {
+    fun foo(): String
+}
+
+fun createObject(): Any? = null
+
+fun box(): String {
+    val result = (createObject() as I?)?.foo()
+    return if (result == null) "OK" else "fail"
+}

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

@@ -2,8 +2,8 @@
 
 var global = ""
 
-inline fun <reified T> log(x: T) {
-    global += jsClass<T>().name + ": " + x
+inline fun <reified T : Any> log(x: T) {
+    global += T::class.js.name + ": " + x
 }
 
 @native class C {

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

@@ -0,0 +1,9 @@
+@native interface I {
+    fun foo(): String
+}
+fun createObject(): Any? = null
+
+fun box(): String {
+    val result = (createObject() as? I)?.foo()
+    return if (result == null) "OK" else "fail"
+}