util: avoid run debug when enabled is false

fengmk2 · aduh95 · commit f36bee4b8985 · 2025-03-23T11:42:42.000+01:00
it can improve performace 700x faster PR-URL: #57494 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Jordan Harband <ljharb@gmail.com>
diff --git a/lib/internal/util/debuglog.js b/lib/internal/util/debuglog.js
@@ -62,7 +62,7 @@ function lazyUtilColors() {
   return utilColors;
 }
 
-function debuglogImpl(enabled, set, args) {
+function debuglogImpl(enabled, set) {
   if (debugImpls[set] === undefined) {
     if (enabled) {
       const pid = process.pid;
@@ -109,6 +109,8 @@ function debuglog(set, cb) {
     return enabled;
   };
   const logger = (...args) => {
+    // Improve performance when debug is disabled, avoid calling `new SafeArrayIterator(args)`
+    if (enabled === false) return;
     switch (args.length) {
       case 1: return debug(args[0]);
       case 2: return debug(args[0], args[1]);
