Add the ability to throw an exception from workers

console-test-script.js

@@ -158,6 +158,9 @@ function spawnWorker({ log = false } = {}) {
       delay: 1,
       message: "worker created",
     });
+    worker.postMessage({
+      type: "exception",
+    });
   }
 
   if (document.readyState !== "complete") {
@@ -196,7 +199,16 @@ function addWorkerElementToWorkerList(worker, url) {
       message: `log-${++logCount}`,
     });
   });
-  li.append(info, logButton, terminateButton);
+
+  const errorButton = document.createElement("button");
+  errorButton.textContent = "Exception";
+  errorButton.classList.add("regular");
+  errorButton.addEventListener("click", () => {
+    worker.postMessage({
+      type: "exception",
+    });
+  });
+  li.append(info, logButton, errorButton, terminateButton);
   workersList.append(li);
   li.scrollIntoView();
 }

worker.js

@@ -2,11 +2,14 @@ onmessage = function (e) {
   console.log("⚙️ Message received in worker", e, globalThis);
   const { type } = e.data;
 
-  if (type == "delay") {
-    console.info("⚙️ delay, echoing ", e.data, "…");
-    setTimeout(() => {
-      console.log("⚙️ …echo");
-      postMessage(`··${e.data.message}··`);
-    }, e.data.delay);
+  switch (type) {
+    case "delay":
+      setTimeout(() => {
+        console.log("⚙️ …echo");
+        postMessage(`··${e.data.message}··`);
+      }, e.data.delay);
+      break;
+    case "exception":
+      globalThis.x.y.x;
   }
 };