Add support for prerender:true

[brophdawg11]

In simple "true static" sites, React Router can determine all of the static paths so there's no reason to require the app to tell us about the static paths via an array/function. This PR adds support for prerender: true which will walk your route tree and automatically prerender any paths that don't have dynamic/splat params.

We also expose this internal logic to the function API so you can just add your own dynamic paths on top of the known static paths:

export default defineConfig({
  plugins: [
    reactRouter({
      async prerender({ getStaticPaths }) {
        let slugs = await getBlogSlugsFromCms();
        return [
          ...getStaticPaths(),
          ...slugs.map((s) => `/blog/${s}`),
        ];
      },
    }),
  ],
});

In a routes.ts landscape this will be nice to avoid needing to add a route in 3 places - FS, routes.ts, prerender

[changeset-bot]

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