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PromiseRejectionEvent

The PromiseRejectionEvent interface represents events which are fired when JavaScript Promises are rejected. These events are particularly useful for telemetry and debugging purposes.
API Events events HTML DOM Interface JavaScript PromiseRejectionEvent Promises Reference

PromiseRejectionEvent()

The PromiseRejectionEvent() constructor returns a newly created PromiseRejectionEvent, which represents events fired when a JavaScript Promise is rejected.
API Constructor events Events HTML DOM JavaScript PromiseRejectionEvent Promises Reference

PromiseRejectionEvent.promise

The PromiseRejectionEvent.promise read-only property indicates the JavaScript Promise which has been rejected. You can examine the event's PromiseRejectionEvent.reason property to learn why the promise was rejected.
API events Events HTML DOM JavaScript Promise PromiseRejectionEvent Promises Property Reference

PromiseRejectionEvent.reason

The PromiseRejectionEvent.reason read-only property is any JavaScript value or Object which provides the reason passed into Promise.reject(). This in theory provides information about why the promise was rejected.
API Events events HTML DOM JavaScript PromiseRejectionEvent Promises Property reason Reference

WindowEventHandlers.onrejectionhandled

The Window.onrejectionhandled property is an event handler for processing rejectionhandled events, which are raised when Promises are rejected.
API Event Handlers events Events HTML DOM JavaScript onrejectionhandled Promises Property Reference WindowEventHandlers

WindowEventHandlers.onunhandledrejection

The Window.onunhandledrejection property is an event handler for processing unhandledrejection events, which are raised for unhandled Promise rejections.
API Event Handler events Events HTML DOM onunhandledrejection Promises Property Reference WindowEventHandlers