From 91229099b5a4bf8c7c5e78ae82ace3d9085030cd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Jes=C3=BAs=20Sinohui=20Fern=C3=A1ndez?=
 <josejesinohui@gmail.com>
Date: Wed, 3 Feb 2021 09:43:29 -0800
Subject: [PATCH] Adds BigInt support to stringify util function (#4112)

---
 lib/utils.js            | 3 +++
 test/unit/utils.spec.js | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/lib/utils.js b/lib/utils.js
index 853fd5b108..c2c5a9573e 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -298,6 +298,9 @@ function jsonStringify(object, spaces, depth) {
             ? '-0'
             : val.toString();
         break;
+      case 'bigint':
+        val = val.toString() + 'n';
+        break;
       case 'date':
         var sDate = isNaN(val.getTime()) ? val.toString() : val.toISOString();
         val = '[Date: ' + sDate + ']';
diff --git a/test/unit/utils.spec.js b/test/unit/utils.spec.js
index c239627f55..a04495a09a 100644
--- a/test/unit/utils.spec.js
+++ b/test/unit/utils.spec.js
@@ -1,3 +1,4 @@
+/* global BigInt */
 'use strict';
 
 var utils = require('../../lib/utils');
@@ -204,6 +205,13 @@ describe('lib/utils', function() {
         expect(stringify(1.2), 'to be', '1.2');
         expect(stringify(1e9), 'to be', '1000000000');
       });
+
+      if (typeof BigInt === 'function') {
+        it('should work with bigints when possible', function() {
+          expect(stringify(BigInt(1)), 'to be', '1n');
+          expect(stringify(BigInt(2)), 'to be', '2n');
+        });
+      }
     });
 
     describe('canonicalize example', function() {