unhandledrejection

The unhandledrejection event is fired when a JavaScript Promise is rejected but there is no rejection handler to deal with the rejection.

Bubbles	No
Cancelable	No
Target objects	defaultView
Interface	PromiseRejectionEvent

Examples

window.addEventListener("unhandledrejection", function (event) {
  console.warn("WARNING: Unhandled promise rejection. Shame on you! Reason: "
               + event.reason);
});

Inheritance

The unhandledrejection event implements the PromiseRejectionEvent interface, which inherits from Event. You can use the properties and methods defined on these interfaces.

See also

• rejectionhandled
• PromiseRejectionEvent
• Promise