From 39dc947409c7df19ac4f9502df8cb0d4a1b2829a Mon Sep 17 00:00:00 2001
From: Gus Caplan <me@gus.host>
Date: Sat, 27 Jan 2018 13:57:53 -0600
Subject: [PATCH] util: add bigint formatting to util.inspect
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PR-URL: https://github.com/nodejs/node/pull/18412
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
---
 lib/util.js                               |  4 ++++
 test/parallel/test-util-inspect-bigint.js | 10 ++++++++++
 2 files changed, 14 insertions(+)
 create mode 100644 test/parallel/test-util-inspect-bigint.js

diff --git a/lib/util.js b/lib/util.js
index 0f0ed408ba4cc1..4525792b2ec4c4 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -342,6 +342,7 @@ inspect.colors = Object.assign(Object.create(null), {
 inspect.styles = Object.assign(Object.create(null), {
   'special': 'cyan',
   'number': 'yellow',
+  'bigint': 'yellow',
   'boolean': 'yellow',
   'undefined': 'grey',
   'null': 'bold',
@@ -650,6 +651,9 @@ function formatPrimitive(fn, value, ctx) {
   }
   if (typeof value === 'number')
     return formatNumber(fn, value);
+  // eslint-disable-next-line valid-typeof
+  if (typeof value === 'bigint')
+    return fn(`${value}n`, 'bigint');
   if (typeof value === 'boolean')
     return fn(`${value}`, 'boolean');
   if (typeof value === 'undefined')
diff --git a/test/parallel/test-util-inspect-bigint.js b/test/parallel/test-util-inspect-bigint.js
new file mode 100644
index 00000000000000..cb50c1f6982460
--- /dev/null
+++ b/test/parallel/test-util-inspect-bigint.js
@@ -0,0 +1,10 @@
+'use strict';
+
+// Flags: --harmony-bigint
+
+require('../common');
+const assert = require('assert');
+
+const { inspect } = require('util');
+
+assert.strictEqual(inspect(1n), '1n');