fix(ext/node): worker_threads doesn't exit if there are message listeners (#22944)

Closes https://github.com/denoland/deno/issues/22934

1 files changed, 11 insertions, 1 deletions

diff --git a/tests/testdata/workers/node_worker_auto_exits.mjs b/tests/testdata/workers/node_worker_auto_exits.mjs
index abfb084c3..e434f59f7 100644
--- a/tests/testdata/workers/node_worker_auto_exits.mjs
+++ b/tests/testdata/workers/node_worker_auto_exits.mjs
@@ -1,9 +1,19 @@
-import { isMainThread, Worker } from "node:worker_threads";
+import { isMainThread, parentPort, Worker } from "node:worker_threads";
+
+function onMessageOneshot() {
+  console.log("Got message from main thread!");
+  parentPort.off("message", onMessageOneshot);
+}
 
 if (isMainThread) {
   // This re-loads the current file inside a Worker instance.
   const w = new Worker(import.meta.filename);
+
+  setTimeout(() => {
+    w.postMessage("Hello! I am from the main thread.");
+  }, 500);
 } else {
   console.log("Inside Worker!");
   console.log(isMainThread); // Prints 'false'.
+  parentPort.on("message", onMessageOneshot);
 }