fix: align DedicatedWorkerGlobalScope event handlers to spec (#11353)

1 files changed, 23 insertions, 0 deletions

diff --git a/cli/tests/workers/worker_event_handlers.js b/cli/tests/workers/worker_event_handlers.js
new file mode 100644
index 000000000..c8976f79e
--- /dev/null
+++ b/cli/tests/workers/worker_event_handlers.js
@@ -0,0 +1,23 @@
+self.onmessage = (evt) => {
+  console.log("Target from self.onmessage:", String(evt.target));
+};
+
+self.addEventListener("message", (evt) => {
+  console.log("Target from message event listener:", String(evt.target));
+
+  // Throw an error here so the global's error event will fire.
+  throw new Error("Some error message");
+});
+
+self.onerror = (...args) => {
+  console.log("Arguments from self.onerror:", args);
+  return true;
+};
+
+self.addEventListener("error", (evt) => {
+  // Returning true from self.onerror means that subsequent event listeners
+  // should see the event as canceled.
+  console.log("Is event canceled?:", evt.defaultPrevented);
+
+  self.close();
+});