make optionl to optional array schema

Author: Code-Hex

src/graphql.ts

@@ -5,11 +5,11 @@ import {
   TypeNode,
 } from "graphql";
 
-export const isListType = (typ: TypeNode): typ is ListTypeNode =>
-  typ.kind === "ListType";
-export const isNonNullType = (typ: TypeNode): typ is NonNullTypeNode =>
-  typ.kind === "NonNullType";
-export const isNamedType = (typ: TypeNode): typ is NamedTypeNode =>
-  typ.kind === "NamedType";
+export const isListType = (typ?: TypeNode): typ is ListTypeNode =>
+  typ?.kind === "ListType";
+export const isNonNullType = (typ?: TypeNode): typ is NonNullTypeNode =>
+  typ?.kind === "NonNullType";
+export const isNamedType = (typ?: TypeNode): typ is NamedTypeNode =>
+  typ?.kind === "NamedType";
 
 export const isInput = (kind: string) => kind.includes("Input");

src/yup/index.ts

@@ -128,21 +128,27 @@ const generateInputObjectFieldYupSchema = (
 const generateInputObjectFieldTypeYupSchema = (
   tsVisitor: TsVisitor,
   schema: GraphQLSchema,
-  type: TypeNode
+  type: TypeNode,
+  parentType?: TypeNode
 ): string => {
   if (isListType(type)) {
     const gen = generateInputObjectFieldTypeYupSchema(
       tsVisitor,
       schema,
-      type.type
+      type.type,
+      type,
     );
+    if (!isNonNullType(parentType)) {
+      return `yup.array().of(${maybeLazy(type.type, gen)}).optional()`;
+    }
     return `yup.array().of(${maybeLazy(type.type, gen)})`;
   }
   if (isNonNullType(type)) {
     const gen = generateInputObjectFieldTypeYupSchema(
       tsVisitor,
       schema,
-      type.type
+      type.type,
+      type,
     );
     return maybeLazy(type.type, `${gen}.required()`);
   }

test.graphql

@@ -16,6 +16,7 @@ input PageInput {
   attributes: [AttributeInput!]
   pageType: PageType!
   date: Date
+  postIDs: [ID!]
 }
 
 input AttributeInput {