From 136a96722a151bf40c0d8d7cafdd2ab0ef2bcbd1 Mon Sep 17 00:00:00 2001
From: Shelley Vohr <shelley.vohr@gmail.com>
Date: Fri, 6 Oct 2023 11:17:04 +0200
Subject: [PATCH] crypto: account for disabled SharedArrayBuffer
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PR-URL: https://github.com/nodejs/node/pull/50034
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Matthew Aitken <maitken033380023@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
---
 lib/internal/crypto/webidl.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/internal/crypto/webidl.js b/lib/internal/crypto/webidl.js
index 9f5340c223902c..61a4cfe4330703 100644
--- a/lib/internal/crypto/webidl.js
+++ b/lib/internal/crypto/webidl.js
@@ -184,7 +184,10 @@ function isNonSharedArrayBuffer(V) {
 }
 
 function isSharedArrayBuffer(V) {
-  return ObjectPrototypeIsPrototypeOf(SharedArrayBuffer.prototype, V);
+  // SharedArrayBuffers can be disabled with --no-harmony-sharedarraybuffer.
+  if (SharedArrayBuffer !== undefined)
+    return ObjectPrototypeIsPrototypeOf(SharedArrayBuffer.prototype, V);
+  return false;
 }
 
 converters.Uint8Array = (V, opts = kEmptyObject) => {