Add missing typings

[tmkx]

Next.js has provided a way to do internationalization, but it's URL-based, different locales have a different route.

It doesn't meet all scenes, so I detect the user's Accept-Languages header to choose a locale, or users can persist theirs prefer locale in Cookies. I did this in App.getInitialProps, read cookies, and then render the right locale, but the AppContext's req doesn't have cookies typings, so I think it's maybe "missing"?

cookies were processed in:

next.js/packages/next/server/base-server.ts

Line 372 in 9836429

setLazyProp({ req: req as any }, 'cookies', getCookieParser(req.headers))

Bug

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Feature

• Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
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Documentation / Examples

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[ijjk]

Hi, this change looks good, can we add a test for this potentially to this test suite ensuring the type is valid on a page with getServerSideProps?

[timneutkens]

Can you add a clear description to the PR body, it's currently not super clear what this is fixing.

[tmkx]

Can you add a clear description to the PR body, it's currently not super clear what this is fixing.

@timneutkens my bad, updated.

[tmkx]

fixed by #32999