Factor into getIntrospectionQuery

Author: benjie

src/utilities/getIntrospectionQuery.ts

@@ -38,6 +38,17 @@ export interface IntrospectionOptions {
    * Default: false
    */
   oneOf?: boolean;
+
+  /**
+   * Choose the type of nullability you would like to see.
+   *
+   * - AUTO: SEMANTIC if errorPropagation is set to false, otherwise TRADITIONAL
+   * - TRADITIONAL: all GraphQLSemanticNonNull will be unwrapped
+   * - SEMANTIC: all GraphQLNonNull will be converted to GraphQLSemanticNonNull
+   * - FULL: the true nullability will be returned
+   *
+   */
+  nullability?: 'AUTO' | 'TRADITIONAL' | 'SEMANTIC' | 'FULL';
 }
 
 /**
@@ -52,6 +63,7 @@ export function getIntrospectionQuery(options?: IntrospectionOptions): string {
     schemaDescription: false,
     inputValueDeprecation: false,
     oneOf: false,
+    nullability: null,
     ...options,
   };
 
@@ -70,6 +82,7 @@ export function getIntrospectionQuery(options?: IntrospectionOptions): string {
     return optionsWithDefault.inputValueDeprecation ? str : '';
   }
   const oneOf = optionsWithDefault.oneOf ? 'isOneOf' : '';
+  const nullability = optionsWithDefault.nullability;
 
   return `
     query IntrospectionQuery {
@@ -105,7 +118,7 @@ export function getIntrospectionQuery(options?: IntrospectionOptions): string {
         args${inputDeprecation('(includeDeprecated: true)')} {
           ...InputValue
         }
-        type {
+        type${nullability ? `(nullability: ${nullability})` : ``} {
           ...TypeRef
         }
         isDeprecated