From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shelley Vohr <shelley.vohr@gmail.com>
Date: Sat, 25 Oct 2025 11:06:10 +0200
Subject: lib: check SharedArrayBuffer existence in fast-utf8-stream

After https://github.com/nodejs/node/pull/58897 calling
Object.entries on fs will lazy-load fast-utf8-stream, which uses
SharedArrayBuffer without checking for its existence first. It
won't exist in the renderer process and will throw
'SharedArrayBuffer is not a constructor'. Refactor to check
for SharedArrayBuffer first.

This should be upstreamed to Node.js

diff --git a/lib/internal/modules/esm/loader.js b/lib/internal/modules/esm/loader.js
index d8e8e6ec291f9eab039e2d31a3566f645bdc0d9c..7a29cd391fdf050ebda50c5b2f263d27001ced74 100644
--- a/lib/internal/modules/esm/loader.js
+++ b/lib/internal/modules/esm/loader.js
@@ -437,15 +437,7 @@ class ModuleLoader {
     assert(wrap instanceof ModuleWrap, `Translator used for require(${url}) should not be async`);
 
     const cjsModule = wrap[imported_cjs_symbol];
-<<<<<<< HEAD
     if (cjsModule && translatorKey !== 'electron') {
-||||||| constructed fake ancestor
-    if (cjsModule) {
-      assert(translatorKey === 'commonjs-sync');
-=======
-    if (cjsModule && translatorKey !== 'electron') {
-      assert(translatorKey === 'commonjs-sync');
->>>>>>> fix: expose the built-in electron module via the ESM loader
       // Check if the ESM initiating import CJS is being required by the same CJS module.
       if (cjsModule?.[kIsExecuting]) {
         const parentFilename = urlToFilename(parentURL);
diff --git a/lib/internal/streams/fast-utf8-stream.js b/lib/internal/streams/fast-utf8-stream.js
index 25f4771d052a2a2ef35eb910bfd75bd51bc891d9..3028d1a6538ec611d08566c565589c78dda1b6e1 100644
--- a/lib/internal/streams/fast-utf8-stream.js
+++ b/lib/internal/streams/fast-utf8-stream.js
@@ -60,10 +60,14 @@ function sleep(ms) {
       throw new ERR_INVALID_ARG_TYPE('ms', ['number', 'bigint'], ms);
     }
     throw new ERR_INVALID_ARG_VALUE.RangeError('ms', ms,
-                                               'must be a number greater than 0 and less than Infinity');
+      'must be a number greater than 0 and less than Infinity');
+  }
+  if (haveSAB) {
+    AtomicsWait(kNil, 0, 0, Number(ms));
+  } else {
+    const { sleep: _sleep } = internalBinding('util');
+    _sleep(ms);
   }
-
-  AtomicsWait(kNil, 0, 0, Number(ms));
 }
 
 // 16 KB. Don't write more than docker buffer size.