From 64478a0b8111e96b330acbd3c16f06036f86ef53 Mon Sep 17 00:00:00 2001
From: James M Snell <jsnell@cloudflare.com>
Date: Thu, 21 Nov 2024 15:13:45 -0800
Subject: [PATCH] No need to throw when closing a WritableStream that's already
 closing

---
 src/workerd/api/streams/internal.c++ | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/workerd/api/streams/internal.c++ b/src/workerd/api/streams/internal.c++
index be3ffefa20a..9a459b0caf4 100644
--- a/src/workerd/api/streams/internal.c++
+++ b/src/workerd/api/streams/internal.c++
@@ -1020,8 +1020,7 @@ void WritableStreamInternalController::setHighWaterMark(uint64_t highWaterMark)
 
 jsg::Promise<void> WritableStreamInternalController::closeImpl(jsg::Lock& js, bool markAsHandled) {
   if (isClosedOrClosing()) {
-    auto reason = js.v8TypeError("This WritableStream has been closed."_kj);
-    return rejectedMaybeHandledPromise<void>(js, reason, markAsHandled);
+    return js.resolvedPromise();
   }
   if (isPiping()) {
     auto reason = js.v8TypeError("This WritableStream is currently being piped to."_kj);