From 3f859d4e5e6088deea97193d5106382a901a9c21 Mon Sep 17 00:00:00 2001
From: Ivan Goncharov <ivan.goncharov.ua@gmail.com>
Date: Tue, 18 Feb 2020 18:31:21 +0530
Subject: [PATCH] getNullableType: fix TS signature (#2460)

partial revert of https://github.com/graphql/graphql-js/commit/23b427cacc3a6d16eb985ea3e5ab9b47d7a295d0#diff-15f6b6c92ff954f80995d31726f89851L477
Reported by @yaacovCR here:
https://github.com/yaacovCR/graphql-tools-fork/issues/40#issuecomment-586671219
---
 src/type/definition.d.ts | 4 +++-
 src/type/definition.js   | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/type/definition.d.ts b/src/type/definition.d.ts
index 32cf43d054..df62c66743 100644
--- a/src/type/definition.d.ts
+++ b/src/type/definition.d.ts
@@ -241,8 +241,10 @@ export function isNullableType(type: any): type is GraphQLNullableType;
 export function assertNullableType(type: any): GraphQLNullableType;
 
 export function getNullableType(type: void): undefined;
+export function getNullableType<T extends GraphQLNullableType>(type: T): T;
 export function getNullableType<T extends GraphQLNullableType>(
-  type: GraphQLNonNull<T> | T,
+  // eslint-disable-next-line @typescript-eslint/unified-signatures
+  type: GraphQLNonNull<T>,
 ): T;
 
 /**
diff --git a/src/type/definition.js b/src/type/definition.js
index 739732cd5f..2d5a15117d 100644
--- a/src/type/definition.js
+++ b/src/type/definition.js
@@ -474,7 +474,8 @@ export function assertNullableType(type: mixed): GraphQLNullableType {
 
 /* eslint-disable no-redeclare */
 declare function getNullableType(type: void | null): void;
-declare function getNullableType<T>(type: GraphQLNonNull<T> | T): T;
+declare function getNullableType<T: GraphQLNullableType>(type: T): T;
+declare function getNullableType<T>(type: GraphQLNonNull<T>): T;
 export function getNullableType(type) {
   /* eslint-enable no-redeclare */
   if (type) {