TypeScript behind on Object prototype properties

[jackbsteinberg]

Some Object prototype properties are overridden by the classes that inherit from the Object prototype, and TypeScript has not reflected all of these overridden properties in their respective types. Specifically:

URL.toString()
Boolean.toString()
Error.toString()

are all missing toString in their properties. We commented on this bug on TypeScript to call attention to the absence, and will be tracking the issue. For now testing of Object prototype properties will be done with the assumption that the above are not overridden - with documentation outlining the situation, and code that will start to fail when TypeScript is updated.

[fergald]

Does our testing framework have any way to add tests we expect to fail? If so, we should add tests that exercise these missing features and once TS updates we can switch them away from expected-to-fail.

…

On Thu, 12 Sep 2019 at 16:39, Jack Steinberg ***@***.***> wrote: Some Object prototype properties are overridden by the classes that inherit from the Object prototype, and TypeScript has not reflected all of these overridden properties in their respective types. Specifically: URL.toString()Boolean.toString()Error.toString() are all missing toString in their properties. We commented on this bug on TypeScript <microsoft/TypeScript#30225 (comment)> to call attention to the absence, and will be tracking the issue. For now testing of Object prototype properties will be done with the assumption that the above are not overridden - with documentation outlining the situation, and code that will start to fail when TypeScript is updated. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#79?email_source=notifications&email_token=ABAO5ZZOL57B3YXMQF7KGZTQJHW4ZA5CNFSM4IWAKJE2YY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4HK5CG4Q>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABAO5Z364SUQQHGHAKMJGSTQJHW4ZANCNFSM4IWAKJEQ> .

[domenic]

It does not, sadly. That's a surprisingly-rare feature in the JavaScript testing ecosystem; I've searched around.

See jestjs/jest#8317