From d51dabc25f2e178eb6b2c5b39600df8d6126eba0 Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Tue, 7 May 2024 09:39:43 +0200
Subject: [PATCH] perf: avoid setImmediate if body is reading (#3210)

---
 lib/api/readable.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/api/readable.js b/lib/api/readable.js
index f0e4dbd34bc..a65a7fcb557 100644
--- a/lib/api/readable.js
+++ b/lib/api/readable.js
@@ -63,9 +63,13 @@ class BodyReadable extends Readable {
     // tick as it is created, then a user who is waiting for a
     // promise (i.e micro tick) for installing a 'error' listener will
     // never get a chance and will always encounter an unhandled exception.
-    setImmediate(() => {
+    if (!this[kReading]) {
+      setImmediate(() => {
+        callback(err)
+      })
+    } else {
       callback(err)
-    })
+    }
   }
 
   on (ev, ...args) {