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i think it's missing the declare var PromiseRejectionEvent part

function getErrorEventText (event: ErrorEvent | PromiseRejectionEvent) {
	
	if (event instanceof ErrorEvent) {
		return event.message;
	}
	
	// [ts] 'PromiseRejectionEvent' only refers to a type, but is being used as a value here.
	if (event instanceof PromiseRejectionEvent) {
		return String(event.reason);
	}
	
	return "<unknown error>";
	
}

i had to put this in my code (modified from ErrorEvent):

declare var PromiseRejectionEvent: {
    prototype: PromiseRejectionEvent;
    new(type: string, promiseRejectionEventInitDict?: PromiseRejectionEventInit): PromiseRejectionEvent;
}

Hi @epicgirl1998 do you mind send another PR to fix this! Help is appreciated. Thank you!

i would like to contribute but i can't seem to find any documentation for the input json files (how do all the other contributors know what to do? or am i just missing something?)

The general overview is at https://github.com/Microsoft/TSJS-lib-generator/blob/master/README.md
You can refer to json format used by other types in the json file to figure out what you need to add.

For this case, I think it should be sufficient to add a "constructorSignatures" to this json. Similar example can be found at:
https://github.com/Microsoft/TSJS-lib-generator/blob/master/inputfiles/addedTypes.json#L184