worker: unroll file extension regexp

Refs: #31662 (comment)

PR-URL: #31779
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Denys Otrishko <[email protected]>
Reviewed-By: Gus Caplan <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Yongsheng Zhang <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>

Author: addaleax

lib/internal/worker.js

@@ -103,7 +103,7 @@ class Worker extends EventEmitter {
       filename = path.resolve(filename);
 
       const ext = path.extname(filename);
-      if (!/^\.[cm]?js$/.test(ext)) {
+      if (ext !== '.js' && ext !== '.mjs' && ext !== '.cjs') {
         throw new ERR_WORKER_UNSUPPORTED_EXTENSION(ext);
       }
     }