From 527bdee2747dca166db9a51a952eba450bbd0d96 Mon Sep 17 00:00:00 2001
From: Mykola Silin <silin.nickolay@gmail.com>
Date: Mon, 15 Nov 2021 11:23:05 +0100
Subject: [PATCH] Fix compatibility of methods with native return type in PHP
 8.1 (#1011)

(cherry picked from commit 51ad17c3af192e34bc2e368a3c645a5a668f3e15)
---
 src/Error/Error.php             | 2 ++
 src/Language/SourceLocation.php | 2 ++
 src/Type/Definition/Type.php    | 5 ++++-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/Error/Error.php b/src/Error/Error.php
index e4ad9ac99..1e3ee0008 100644
--- a/src/Error/Error.php
+++ b/src/Error/Error.php
@@ -10,6 +10,7 @@
 use GraphQL\Language\SourceLocation;
 use GraphQL\Utils\Utils;
 use JsonSerializable;
+use ReturnTypeWillChange;
 use Throwable;
 use Traversable;
 use function array_filter;
@@ -367,6 +368,7 @@ static function (SourceLocation $loc) : array {
      * @return mixed data which can be serialized by <b>json_encode</b>,
      * which is a value of any type other than a resource.
      */
+    #[ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return $this->toSerializableArray();
diff --git a/src/Language/SourceLocation.php b/src/Language/SourceLocation.php
index 8877f8433..d0041831a 100644
--- a/src/Language/SourceLocation.php
+++ b/src/Language/SourceLocation.php
@@ -5,6 +5,7 @@
 namespace GraphQL\Language;
 
 use JsonSerializable;
+use ReturnTypeWillChange;
 
 class SourceLocation implements JsonSerializable
 {
@@ -46,6 +47,7 @@ public function toSerializableArray()
     /**
      * @return int[]
      */
+    #[ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return $this->toSerializableArray();
diff --git a/src/Type/Definition/Type.php b/src/Type/Definition/Type.php
index 864bcfed2..5dd67ceab 100644
--- a/src/Type/Definition/Type.php
+++ b/src/Type/Definition/Type.php
@@ -11,6 +11,8 @@
 use GraphQL\Utils\Utils;
 use JsonSerializable;
 use ReflectionClass;
+use ReturnTypeWillChange;
+
 use function array_keys;
 use function array_merge;
 use function assert;
@@ -308,7 +310,8 @@ public function assertValid()
     /**
      * @return string
      */
-    public function jsonSerialize()
+    #[ReturnTypeWillChange]
+    public function jsonSerialize(): string
     {
         return $this->toString();
     }