test,worker: simplify common.isMainThread

Now that `worker_threads` do not require a flag, the logic around
loading `isMainThread` can be removed.

PR-URL: https://github.com/nodejs/node/pull/25426
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 1 insertions, 7 deletions

diff --git a/test/common/index.js b/test/common/index.js
index eff5f47e89..c1fb28121e 100644
--- a/test/common/index.js
+++ b/test/common/index.js
@@ -46,13 +46,7 @@ const noop = () => {};
 
 const hasCrypto = Boolean(process.versions.openssl);
 
-const isMainThread = (() => {
-  if (require('module').builtinModules.includes('worker_threads')) {
-    return require('worker_threads').isMainThread;
-  }
-  // Worker module not enabled → only a single main thread exists.
-  return true;
-})();
+const { isMainThread } = require('worker_threads');
 
 // Check for flags. Skip this for workers (both, the `cluster` module and
 // `worker_threads`) and child processes.