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 }),
  });
  

  Cache invalidation options

  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'],
      },
    }),
  });