util: use Set to store deprecation codes

PR-URL: #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>

Author: dnalborczyk

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.
-constcodesWarned={};
+constcodesWarned=newSet();
 
 // 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);