[backport] fix: validation return types of pages API routes (#83069) #83580
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## For Contributors ### Fixing a bug - Updates the (previously incorrect) API route handler type definition in the validator - Changes the return type from `Promise<Response | void> | Response | void` to `unknown | Promise<unknown>` - Updates the test route example to use the `NextApiHandler` type (making sure it works) Fixes vercel#83067
ijjk
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create-next-app
ijjk
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Sep 8, 2025
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I don't think this fix ever got backported to Next 15.5!
@huozhi @ijjk @ztanner