[next] Ensure all static routes have static streaming lambda path

[wyattjoh]

When there's a match for a prerender, the dynamic query parameters will not be provided via the x-now-route-matches. This ensures that when generating any static route that the static streaming lambda path is used if it's provided, ensuring that when a page is generated via generateStaticParams:

// app/blog/[slug]/page.tsx

type Props = {
  params: {
    slug: string
  }
}

export function generateStaticParams() {
  return [{ slug: "one" }, { slug: "two" }, { slug: "three" }]
}

export default function BlogPage({ slug }: Props) {
  // ...
}

That we use the specific routes (/blog/one, /blog/two, and /blog/three) for the partial prerendering streaming path instead of the paramatarized pathname (/blog/[slug]) as the rewrites won't be matched once a match for a prerender has been found.

This additionally updates the tests to ensure that the correct pathname is observed (this was previously silently failing).

[changeset-bot]

🦋 Changeset detected

Latest commit: 163d151

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@vercel/next	Patch
vercel	Patch

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[wyattjoh]

• [next] Ensure all static routes have static streaming lambda path #11259 👈
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