[FIR JS] Report NESTED_JS_EXPORT

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

@@ -4981,6 +4981,12 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirJsErrors.NESTED_JS_EXPORT) { firDiagnostic ->
+        NestedJsExportImpl(
+            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

@@ -3462,6 +3462,10 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = ExternalInterfaceAsClassLiteral::class
     }
 
+    abstract class NestedJsExport : KtFirDiagnostic<KtElement>() {
+        override val diagnosticClass get() = NestedJsExport::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

@@ -4190,6 +4190,11 @@ internal class ExternalInterfaceAsClassLiteralImpl(
     override val token: KtLifetimeToken,
 ) : KtFirDiagnostic.ExternalInterfaceAsClassLiteral(), KtAbstractFirDiagnostic<KtElement>
 
+internal class NestedJsExportImpl(
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.NestedJsExport(), KtAbstractFirDiagnostic<KtElement>
+
 internal class DelegationByDynamicImpl(
     override val firDiagnostic: KtPsiDiagnostic,
     override val token: KtLifetimeToken,