From cb4adabb4a68a5b7a85bcbd04c8c620c4305964e Mon Sep 17 00:00:00 2001
From: Ruben Bridgewater <ruben@bridgewater.de>
Date: Mon, 29 Nov 2021 21:54:35 +0100
Subject: [PATCH] lib: do not crash using workers with disabled shared array
 buffers

This allows the repl to function normally while using the
`--no-harmony-sharedarraybuffer` V8 flag.

Fixes: https://github.com/nodejs/node/issues/39717

Signed-off-by: Ruben Bridgewater <ruben@bridgewater.de>
---
 lib/internal/bootstrap/switches/does_own_process_state.js | 2 +-
 lib/internal/worker.js                                    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/internal/bootstrap/switches/does_own_process_state.js b/lib/internal/bootstrap/switches/does_own_process_state.js
index 2924e7f8cc17fa..b8def5c0272d9f 100644
--- a/lib/internal/bootstrap/switches/does_own_process_state.js
+++ b/lib/internal/bootstrap/switches/does_own_process_state.js
@@ -6,7 +6,7 @@ const rawMethods = internalBinding('process_methods');
 process.abort = rawMethods.abort;
 process.umask = wrappedUmask;
 process.chdir = wrappedChdir;
-process.cwd = wrappedCwd;
+process.cwd = typeof SharedArrayBuffer === 'undefined' ? rawMethods.cwd : wrappedCwd;
 
 if (credentials.implementsPosixCredentials) {
   const wrapped = wrapPosixCredentialSetters(credentials);
diff --git a/lib/internal/worker.js b/lib/internal/worker.js
index 1d2cd8cefd2996..2c3dd26d03ea4a 100644
--- a/lib/internal/worker.js
+++ b/lib/internal/worker.js
@@ -90,7 +90,7 @@ let cwdCounter;
 
 const environmentData = new SafeMap();
 
-if (isMainThread) {
+if (isMainThread && typeof SharedArrayBuffer !== 'undefined') {
   cwdCounter = new Uint32Array(new SharedArrayBuffer(4));
   const originalChdir = process.chdir;
   process.chdir = function(path) {