addEventListener("error", (event) => { console.log({ cancelable: event.cancelable, message: event.message, filename: event.filename?.slice?.(-100), 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));