From 5b428507ef246be7ca3afb3589c410874a57f9bc Mon Sep 17 00:00:00 2001
From: Ivan Goncharov <ivan.goncharov.ua@gmail.com>
Date: Thu, 25 Jun 2020 17:42:47 +0300
Subject: [PATCH] Use graphql's predicate function instead of `instanceof`
 (#270)

---
 src/node/plural.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/node/plural.js b/src/node/plural.js
index fa5625e..d342ff3 100644
--- a/src/node/plural.js
+++ b/src/node/plural.js
@@ -1,6 +1,6 @@
 // @flow strict
 
-import { GraphQLList, GraphQLNonNull } from 'graphql';
+import { GraphQLList, GraphQLNonNull, isNonNullType } from 'graphql';
 
 import type {
   GraphQLFieldConfig,
@@ -26,7 +26,7 @@ export function pluralIdentifyingRootField(
 ): GraphQLFieldConfig<mixed, mixed> {
   const inputArgs = {};
   let inputType = config.inputType;
-  if (inputType instanceof GraphQLNonNull) {
+  if (isNonNullType(inputType)) {
     inputType = inputType.ofType;
   }
   inputArgs[config.argName] = {