Property stub based type definition does not support parameter default value

[kwonoj]

Some of operators allows default value if it's not specified like below,

function repeat<T>(count: number = -1);
function defaultIfEmpty<T, R>(defaultValue: R = null);

and Observable has property stub to create prototype in module like
repeat: <T>(count: number) => Observable<T>
default value for parameter is not allowed, end result causes typescript compiler complains without parameter.

Rx.Observable.of(42).defaultIfEmpty();
error TS2346: Supplied parameters do not match any signature of call target.

related with #608, and #643 for remove property based stubs.

[benlesh]

repeat: (count: number) => Observable

It should probably just be repeat: <T>(count?: number) => Observable<T> in the stub, then.

? will make the difference, I think.

[kwonoj]

Yes, you're correct. Completely forgot it somehow even staring optional operators all time.

[kwonoj]

Will update PR and close this one.