unhandledrejection event missing from WindowEventMap

[robatwilliams]

TypeScript Version: 2.6.1

Code

window.addEventListener('unhandledrejection', event => {
  // event is of type Event
});

window.addEventListener('unhandledrejection', (event: PromiseRejectionEvent) => {
    /*
Argument of type '(event: PromiseRejectionEvent) => void' is not assignable to parameter of type 'EventListenerOrEventListenerObject'.
  Type '(event: PromiseRejectionEvent) => void' is not assignable to type 'EventListenerObject'.
    Property 'handleEvent' is missing in type '(event: PromiseRejectionEvent) => void'.
*/
});

Expected behavior:
Event listener for unhandledrejection should have event type PromiseRejectionEvent.

I believe an entry needs adding to WindowEventMap in lib.dom.d.ts.

Actual behavior:
Compiler error as shown in code sample above, when using strict mode.

Workaround:
Use declaration merging; create a typings file and include

interface WindowEventMap {
  'unhandledrejection': PromiseRejectionEvent;
}

[shobhitchittora]

Hi @RyanCavanaugh I'd like to take this up. Also would need some pointer to get started on this issue.

[robatwilliams]

rejectionhandled needs doing too

[benbraou]

@shobhitchittora I am also starting to contribute to TypeScript but I hope this will help:
From what I see, the change needs to be done in TSJS-lib-generator.
It seems that unhandledrejection/ rejectionhandled events are missing from Edge spec. So, they need to be manually added in addedTypes.json as new properties of WindowEventMap.
You might have to add some tweaks in TS.fsx though

[cameron-martin]

It looks like these are now added. See https://github.com/Microsoft/TSJS-lib-generator/blob/master/baselines/dom.generated.d.ts

[mhegazy]

thanks!