feat: `queueMicrotask()` error handling (#15522)

Adds error event dispatching for queueMicrotask(). Consequently unhandled errors are now reported with Deno.core.terminate(), which is immune to the existing quirk with plainly thrown errors (#14158).

1 files changed, 21 insertions, 0 deletions

diff --git a/cli/tests/testdata/queue_microtask_error_handled.ts b/cli/tests/testdata/queue_microtask_error_handled.ts
new file mode 100644
index 000000000..7d1440135
--- /dev/null
+++ b/cli/tests/testdata/queue_microtask_error_handled.ts
@@ -0,0 +1,21 @@
+addEventListener("error", (event) => {
+  console.log({
+    cancelable: event.cancelable,
+    message: event.message,
+    filename: event.filename,
+    lineno: event.lineno,
+    colno: event.colno,
+    error: event.error,
+  });
+  event.preventDefault();
+});
+
+onerror = (event) => {
+  console.log("onerror() called", event.error);
+};
+
+queueMicrotask(() => {
+  throw new Error("foo");
+});
+console.log(1);
+Promise.resolve().then(() => console.log(2));