Review changes

Author: IvanGoncharov

src/index.ts

@@ -228,6 +228,7 @@ export {
   isDefinitionNode,
   isExecutableDefinitionNode,
   isSelectionNode,
+  isNullabilityModifierNode,
   isValueNode,
   isConstValueNode,
   isTypeNode,
@@ -244,7 +245,6 @@ export type {
   KindEnum,
   DirectiveLocationEnum,
   // Visitor utilities
-  ASTReducer,
   ASTVisitor,
   ASTVisitFn,
   ASTVisitorKeyMap,
@@ -263,10 +263,10 @@ export type {
   SelectionNode,
   FieldNode,
   ArgumentNode,
-  NullabilityDesignatorNode,
-  RequiredDesignatorNode,
-  OptionalDesignatorNode,
-  ListNullabilityNode,
+  NullabilityModifierNode,
+  RequiredNullabilityModifierNode,
+  OptionalNullabilityModifierNode,
+  ListNullabilityModifierNode,
   ConstArgumentNode,
   FragmentSpreadNode,
   InlineFragmentNode,