perf(vercel): persist ISR cache across deploys with bypass token

[houssembaltii]

Explanation

• 30-day expiration — accept up to 1 month of stale content, since asset inputs (events, talks, partners) rarely change after publication. Anything older auto-refreshes on next access.

• bypassToken — when content changes (e.g., rename a speaker, swap a partner logo) and we want the affected asset refreshed sooner, invalidate the specific URL with a HEAD request carrying the token:

     curl -I -H "x-prerender-revalidate: $BYPASS_TOKEN" https://forkit-community-git-houssembaltii-isr-cache-c79541-bearstudio.vercel.app/events/2026-france-rouen/assets/save-the-date-insta.jpg

  Per-URL only, no wildcards. The next visit regenerates the image.

• Bulk invalidation (when a change affects every asset) — e.g., adding a new banner to all of them. Curling hundreds of URLs is impractical, so:

  1. Push a commit lowering expiration to a short value (e.g., 60 seconds).
  2. Let the deploy go out; cached entries become stale within ~1 minute of next access.
  3. Push another commit restoring expiration: 60 * 60 * 24 * 30.

Summary by CodeRabbit

• Chores
  • Configured Incremental Static Regeneration (ISR) for deployments with a 30-day cache expiration window.
  • Added support for deployment bypass token configuration.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
forkit-community	Ready	Preview, Comment	May 20, 2026 3:58pm

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request adds Vercel ISR (Incremental Static Regeneration) bypass token support to the project. A new environment variable VERCEL_BYPASS_TOKEN is declared in .env.example and conditionally wired into the Astro Vercel adapter configuration with a 30-day cache expiration.

Changes

Vercel ISR Bypass Token Configuration

Layer / File(s)	Summary
ISR bypass token environment configuration env.example, astro.config.mjs	Environment variable VERCEL_BYPASS_TOKEN is added to .env.example and conditionally included in the Vercel adapter's ISR configuration with explanatory comments and a 30-day cache expiration setting.

Estimated Code Review Effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

A token for the Vercel winds to blow,
Thirty days of cache to help things flow,
The bypass whispers secrets to the ISR,
Clean config updates, no fuss nor stir! 🐰✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: configuring Vercel ISR to persist cache across deployments using a bypass token mechanism.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch houssembaltii/isr-cache-expiration

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[houssembaltii]

example of the response when invalidating an asset .
x-vercel-cache: Revalidated