From 1318fa5703c6394787c5b1bf0ba35d0167f4413e Mon Sep 17 00:00:00 2001
From: jdecroock <decroockjovi@gmail.com>
Date: Fri, 11 Oct 2024 09:16:00 +0200
Subject: [PATCH] Allow for serializing int as BigInt

Co-Authored-By: Hkmu <3169251+hkmu@users.noreply.github.com>
---
 src/type/__tests__/scalars-test.ts | 4 ++++
 src/type/scalars.ts                | 5 ++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/type/__tests__/scalars-test.ts b/src/type/__tests__/scalars-test.ts
index fbb2cd9087..d0ecb04fb7 100644
--- a/src/type/__tests__/scalars-test.ts
+++ b/src/type/__tests__/scalars-test.ts
@@ -534,6 +534,8 @@ describe('Type System: Specified scalar types', () => {
       expect(parseValue(1)).to.equal('1');
       expect(parseValue(0)).to.equal('0');
       expect(parseValue(-1)).to.equal('-1');
+      expect(parseValue(BigInt(123))).to.equal('123');
+      expect(parseValue(1n)).to.equal('1');
 
       // Maximum and minimum safe numbers in JS
       expect(parseValue(9007199254740991)).to.equal('9007199254740991');
@@ -614,6 +616,8 @@ describe('Type System: Specified scalar types', () => {
       expect(serialize(123)).to.equal('123');
       expect(serialize(0)).to.equal('0');
       expect(serialize(-1)).to.equal('-1');
+      expect(serialize(BigInt(123))).to.equal('123');
+      expect(serialize(1n)).to.equal('1');
 
       const valueOf = () => 'valueOf ID';
       const toJSON = () => 'toJSON ID';
diff --git a/src/type/scalars.ts b/src/type/scalars.ts
index a9003f7d54..c11032e9b9 100644
--- a/src/type/scalars.ts
+++ b/src/type/scalars.ts
@@ -252,7 +252,7 @@ export const GraphQLID = new GraphQLScalarType<string>({
     if (typeof coercedValue === 'string') {
       return coercedValue;
     }
-    if (Number.isInteger(coercedValue)) {
+    if (Number.isInteger(coercedValue) || typeof coercedValue === 'bigint') {
       return String(coercedValue);
     }
     throw new GraphQLError(
@@ -267,6 +267,9 @@ export const GraphQLID = new GraphQLScalarType<string>({
     if (typeof inputValue === 'number' && Number.isInteger(inputValue)) {
       return inputValue.toString();
     }
+    if (typeof inputValue === 'bigint') {
+      return inputValue.toString();
+    }
     throw new GraphQLError(`ID cannot represent value: ${inspect(inputValue)}`);
   },