lib: refactor debuglog init

PR-URL: #38838 Reviewed-By: Darshan Sen <[email protected]> Reviewed-By: Anto Aravinth <[email protected]>

Author: aduh95

lib/internal/util/debuglog.js

@@ -1,36 +1,36 @@
 'use strict';
 
 const{
- FunctionPrototypeBind,
  ObjectCreate,
  ObjectDefineProperty,
  RegExp,
-RegExpPrototypeTest,
+RegExpPrototypeExec,
  SafeArrayIterator,
  StringPrototypeToLowerCase,
  StringPrototypeToUpperCase,
 }=primordials;
 
 const{ inspect, format, formatWithOptions }=require('internal/util/inspect');
 
-// `debugs` is deliberately initialized to undefined so any call to
-// debuglog() before initializeDebugEnv() is called will throw.
+// `debugImpls` and `testEnabled` are deliberately not initialized so any call
+// to `debuglog()` before `initializeDebugEnv()` is called will throw.
 letdebugImpls;
-
-letdebugEnvRegex=/^$/;
 lettestEnabled;
 
+
 // `debugEnv` is initial value of process.env.NODE_DEBUG
 functioninitializeDebugEnv(debugEnv){
 debugImpls=ObjectCreate(null);
 if(debugEnv){
+// This is run before any user code, it's OK not to use primordials.
 debugEnv=debugEnv.replace(/[|\\{}()[\]^$+?.]/g,'\\$&')
-.replace(/\*/g,'.*')
-.replace(/,/g,'$|^')
-.toUpperCase();
-debugEnvRegex=newRegExp(`^${debugEnv}$`,'i');
+.replaceAll('*','.*')
+.replaceAll(',','$|^');
+constdebugEnvRegex=newRegExp(`^${debugEnv}$`,'i');
+testEnabled=(str)=>RegExpPrototypeExec(debugEnvRegex,str)!==null;
+}else{
+testEnabled=()=>false;
 }
-testEnabled=FunctionPrototypeBind(RegExpPrototypeTest,null,debugEnvRegex);
 }
 
 // Emits warning when user sets