From b10a809274494d46db2b6bf6930c8c50a2751c9b Mon Sep 17 00:00:00 2001
From: Amjad Ben Hedhili <amjadhedhili@outlook.com>
Date: Sat, 23 Sep 2023 10:39:11 +0100
Subject: [PATCH] Make `newStringUninit` available on the js backend [backport]
 (#22743)

---
 lib/system.nim | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/system.nim b/lib/system.nim
index 8cd526bd02..97d9d72ad6 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -1643,6 +1643,9 @@ when not defined(js):
     else:
       var s = cast[PGenericSeq](result)
       s.len = len
+else:
+  proc newStringUninit*(len: Natural): string {.
+    magic: "NewString", importc: "mnewString", noSideEffect.}
 
 {.pop.}