Include default directives if they are not provided (#548)

Author: vepanimas

src/main/com/intellij/lang/jsgraphql/types/schema/idl/SchemaGenerator.java

@@ -88,6 +88,8 @@ public GraphQLSchema makeExecutableSchema(Options options,
         TypeDefinitionRegistry typeRegistryCopy = new TypeDefinitionRegistry();
         typeRegistryCopy.merge(typeRegistry);
 
+        schemaGeneratorHelper.addDirectivesIncludedByDefault(typeRegistryCopy);
+
         List<GraphQLError> errors = typeChecker.checkTypeRegistry(typeRegistryCopy, wiring);
 
         Map<String, OperationTypeDefinition> operationTypeDefinitions = SchemaExtensionsChecker.gatherOperationDefs(typeRegistry);

src/main/com/intellij/lang/jsgraphql/types/schema/idl/SchemaGeneratorHelper.java

@@ -1248,9 +1248,12 @@ Set<GraphQLDirective> buildAdditionalDirectives(BuildContext buildCtx) {
     }
 
     void addDirectivesIncludedByDefault(TypeDefinitionRegistry typeRegistry) {
-        // we synthesize this into the type registry - no need for them to add it
-        typeRegistry.add(DEPRECATED_DIRECTIVE_DEFINITION);
-        typeRegistry.add(SPECIFIED_BY_DIRECTIVE_DEFINITION);
+        if (typeRegistry.getDirectiveDefinition(DEPRECATED_DIRECTIVE_DEFINITION.getName()).isEmpty()) {
+            typeRegistry.add(DEPRECATED_DIRECTIVE_DEFINITION);
+        }
+        if (typeRegistry.getDirectiveDefinition(SPECIFIED_BY_DIRECTIVE_DEFINITION.getName()).isEmpty()) {
+            typeRegistry.add(SPECIFIED_BY_DIRECTIVE_DEFINITION);
+        }
     }
 
     private @NotNull Optional<OperationTypeDefinition> getOperationNamed(String name, Map<String, OperationTypeDefinition> operationTypeDefs) {