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

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

3 files changed, 13 insertions, 1 deletions

diff --git a/tests/integration/worker_tests.rs b/tests/integration/worker_tests.rs
index 8fdef8b2b..dd0c2d409 100644
--- a/tests/integration/worker_tests.rs
+++ b/tests/integration/worker_tests.rs
@@ -119,6 +119,7 @@ itest!(worker_ids_are_sequential {
 });
 
 // Test for https://github.com/denoland/deno/issues/22629
+// Test for https://github.com/denoland/deno/issues/22934
 itest!(node_worker_auto_exits {
   args: "run --quiet --allow-read workers/node_worker_auto_exits.mjs",
   output: "workers/node_worker_auto_exits.mjs.out",
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);
 }
diff --git a/tests/testdata/workers/node_worker_auto_exits.mjs.out b/tests/testdata/workers/node_worker_auto_exits.mjs.out
index 18934d3ed..a160931db 100644
--- a/tests/testdata/workers/node_worker_auto_exits.mjs.out
+++ b/tests/testdata/workers/node_worker_auto_exits.mjs.out
@@ -1,2 +1,3 @@
 Inside Worker!
 false
+Got message from main thread!