From 5b607a144eba37b0159582ff60d4e55d1a433026 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gmail.com>
Date: Fri, 12 Mar 2021 11:49:06 -0500
Subject: [PATCH] fix: support inspecting bigints (#1321) (#1383)

---
 chai.js                   |  3 +++
 lib/chai/utils/inspect.js |  3 +++
 test/utilities.js         | 10 ++++++++++
 3 files changed, 16 insertions(+)

diff --git a/chai.js b/chai.js
index 9faa3e50b..e1520f7ac 100644
--- a/chai.js
+++ b/chai.js
@@ -8746,6 +8746,9 @@ function formatPrimitive(ctx, value) {
 
     case 'symbol':
       return ctx.stylize(value.toString(), 'symbol');
+
+    case 'bigint':
+      return ctx.stylize(value.toString() + 'n', 'bigint');
   }
   // For some reason typeof null is "object", so special case here.
   if (value === null) {
diff --git a/lib/chai/utils/inspect.js b/lib/chai/utils/inspect.js
index b054aebae..fbb9997f8 100644
--- a/lib/chai/utils/inspect.js
+++ b/lib/chai/utils/inspect.js
@@ -218,6 +218,9 @@ function formatPrimitive(ctx, value) {
 
     case 'symbol':
       return ctx.stylize(value.toString(), 'symbol');
+
+    case 'bigint':
+      return ctx.stylize(value.toString() + 'n', 'bigint');
   }
   // For some reason typeof null is "object", so special case here.
   if (value === null) {
diff --git a/test/utilities.js b/test/utilities.js
index a5f3c8f48..0d5b2cf90 100644
--- a/test/utilities.js
+++ b/test/utilities.js
@@ -756,6 +756,16 @@ describe('utilities', function () {
     });
   });
 
+  it('inspect BigInt', function () {
+    if (typeof BigInt !== 'function') return;
+
+    chai.use(function (_chai, _) {
+      expect(_.inspect(BigInt(0))).to.equal('0n');
+      expect(_.inspect(BigInt(1234))).to.equal('1234n');
+      expect(_.inspect(BigInt(-1234))).to.equal('-1234n');
+    });
+  });
+
   it('inspect every kind of available TypedArray', function () {
     chai.use(function (_chai, _) {
       var arr = [1, 2, 3]