From 4b44db4ed2ab4fa8670495dee61d27159d03b7b6 Mon Sep 17 00:00:00 2001
From: "Kamat, Trivikram" <16024985+trivikr@users.noreply.github.com>
Date: Tue, 12 May 2026 23:19:59 -0700
Subject: [PATCH] stream: optimize single-slot push queue drain

Avoid allocating a new result array when PushQueue drains a single
queued slot. Return that slot directly and keep the existing flattening
path for multiple queued slots.

Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
---
 lib/internal/streams/iter/push.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/internal/streams/iter/push.js b/lib/internal/streams/iter/push.js
index 4c0b3240d45fdb..36da35912c951d 100644
--- a/lib/internal/streams/iter/push.js
+++ b/lib/internal/streams/iter/push.js
@@ -448,6 +448,10 @@ class PushQueue {
   // ===========================================================================
 
   #drain() {
+    if (this.#slots.length === 1) {
+      return this.#slots.shift();
+    }
+
     const result = [];
     for (let i = 0; i < this.#slots.length; i++) {
       const slot = this.#slots.get(i);