[FIR JS] Report rtti-related diagnostics

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -4960,6 +4960,27 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirJsErrors.CANNOT_CHECK_FOR_EXTERNAL_INTERFACE) { firDiagnostic ->
+        CannotCheckForExternalInterfaceImpl(
+            firSymbolBuilder.typeBuilder.buildKtType(firDiagnostic.a),
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirJsErrors.UNCHECKED_CAST_TO_EXTERNAL_INTERFACE) { firDiagnostic ->
+        UncheckedCastToExternalInterfaceImpl(
+            firSymbolBuilder.typeBuilder.buildKtType(firDiagnostic.a),
+            firSymbolBuilder.typeBuilder.buildKtType(firDiagnostic.b),
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirJsErrors.EXTERNAL_INTERFACE_AS_CLASS_LITERAL) { firDiagnostic ->
+        ExternalInterfaceAsClassLiteralImpl(
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirJsErrors.DELEGATION_BY_DYNAMIC) { firDiagnostic ->
         DelegationByDynamicImpl(
             firDiagnostic as KtPsiDiagnostic,

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -3447,6 +3447,21 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         abstract val type: KtType
     }
 
+    abstract class CannotCheckForExternalInterface : KtFirDiagnostic<KtElement>() {
+        override val diagnosticClass get() = CannotCheckForExternalInterface::class
+        abstract val targetType: KtType
+    }
+
+    abstract class UncheckedCastToExternalInterface : KtFirDiagnostic<KtElement>() {
+        override val diagnosticClass get() = UncheckedCastToExternalInterface::class
+        abstract val sourceType: KtType
+        abstract val targetType: KtType
+    }
+
+    abstract class ExternalInterfaceAsClassLiteral : KtFirDiagnostic<KtElement>() {
+        override val diagnosticClass get() = ExternalInterfaceAsClassLiteral::class
+    }
+
     abstract class DelegationByDynamic : KtFirDiagnostic<KtElement>() {
         override val diagnosticClass get() = DelegationByDynamic::class
     }

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -4172,6 +4172,24 @@ internal class NonExternalDeclarationInInappropriateFileImpl(
     override val token: KtLifetimeToken,
 ) : KtFirDiagnostic.NonExternalDeclarationInInappropriateFile(), KtAbstractFirDiagnostic<KtElement>
 
+internal class CannotCheckForExternalInterfaceImpl(
+    override val targetType: KtType,
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.CannotCheckForExternalInterface(), KtAbstractFirDiagnostic<KtElement>
+
+internal class UncheckedCastToExternalInterfaceImpl(
+    override val sourceType: KtType,
+    override val targetType: KtType,
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.UncheckedCastToExternalInterface(), KtAbstractFirDiagnostic<KtElement>
+
+internal class ExternalInterfaceAsClassLiteralImpl(
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.ExternalInterfaceAsClassLiteral(), KtAbstractFirDiagnostic<KtElement>
+
 internal class DelegationByDynamicImpl(
     override val firDiagnostic: KtPsiDiagnostic,
     override val token: KtLifetimeToken,