WindowEventHandlers.onunhandledrejection

The onunhandledrejection property of the WindowEventHandlers mixin is the event handler for processing unhandledrejection events. These events are raised for unhandled Promise rejections.

An event handler or function to call when unhandledrejection events are received by the window. The event handler receives as an input parameter as a PromiseRejectionEvent.

This example logs unhandled rejections' reason values to the console.

window.onunhandledrejection = function(e) {
  console.log(e.reason);
}