🍿 Minor Changes

• #9714 e2fe51c828dc7ea8204788e59e3953fe36c97836 Thanks @lilnasy! - Introduces a new config option, isr, that allows you to deploy your project as an ISR function. ISR (Incremental Static Regeneration) caches your on-demand rendered pages in the same way as prerendered pages after first request.

  To enable this feature, set isr to true in your Vercel adapter configuration in astro.config.mjs:

  export default defineConfig({
    output: 'server',
    adapter: vercel({ isr: true }),
  });

  By default, ISR responses are cached for the duration of your deployment. You can further control caching by setting an expiration time or prevent caching entirely for certain routes.

  Time-based invalidation

  You can change the length of time to cache routes this by configuring an expiration value in seconds:

  export default defineConfig({
    output: 'server',
    adapter: vercel({
      isr: {
        // caches all pages on first request and saves for 1 day
        expiration: 60 * 60 * 24,
      },
    }),
  });

  Manual invalidation

  To implement Vercel’s Draft mode, or On-Demand Incremental Static Regeneration (ISR), you can create a bypass token and provide it to the isr config along with the paths to exclude from caching:

  export default defineConfig({
    output: 'server',
    adapter: vercel({
      isr: {
        // A secret random string that you create.
        bypassToken: '005556d774a8',
        // Paths that will always be served fresh.
        exclude: ['/api/invalidate'],
      },
    }),
  });