Restrict to composite and enum types.

Author: timward60

src/main/kotlin/graphql/kickstart/tools/SchemaClassScanner.kt

@@ -91,6 +91,7 @@ internal class SchemaClassScanner(
             do {
                 val unusedDefinitions = (definitionsByName.values - (dictionary.keys.toSet() + unvalidatedTypes))
                     .filter { definition -> definition.name != "PageInfo" }
+                    .filter { isCompositeOrEnumType(it) }
                     .distinct()
 
                 if (unusedDefinitions.isEmpty()) {
@@ -104,6 +105,10 @@ internal class SchemaClassScanner(
         return validateAndCreateResult(rootTypeHolder)
     }
 
+    private fun isCompositeOrEnumType(definition: TypeDefinition<*>): Boolean {
+        return definition is ObjectTypeDefinition || definition is InterfaceTypeDefinition || definition is UnionTypeDefinition || definition is EnumTypeDefinition
+    }
+
     private fun scanQueue(): Boolean {
         if (queue.isEmpty()) {
             return false