From 0c1fd2069376cb2b3796ea83dc131a0a1def132d Mon Sep 17 00:00:00 2001
From: Daniel Nalborczyk <dnalborczyk@gmail.com>
Date: Thu, 6 Jun 2019 17:08:00 -0400
Subject: [PATCH] util: use Set to store deprecation codes
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PR-URL: https://github.com/nodejs/node/pull/28113
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
---
 lib/internal/util.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/internal/util.js b/lib/internal/util.js
index ed2493d9b4a..931bcea5b4f 100644
--- a/lib/internal/util.js
+++ b/lib/internal/util.js
@@ -35,7 +35,7 @@ function isError(e) {
 
 // Keep a list of deprecation codes that have been warned on so we only warn on
 // each one once.
-const codesWarned = {};
+const codesWarned = new Set();
 
 // Mark that a method should not be used.
 // Returns a modified function which warns once by default.
@@ -53,9 +53,9 @@ function deprecate(fn, msg, code) {
     if (!warned) {
       warned = true;
       if (code !== undefined) {
-        if (!codesWarned[code]) {
+        if (!codesWarned.has(code)) {
           process.emitWarning(msg, 'DeprecationWarning', code, deprecated);
-          codesWarned[code] = true;
+          codesWarned.add(code);
         }
       } else {
         process.emitWarning(msg, 'DeprecationWarning', deprecated);