chore: use a UUID instead of Netlify's function token

[teemingc]

Follow-up on #17022 (comment)

This PR opts to generating a unique ID that Netlify split serverless functions check before restoring the requested original URL pathname. This approach works with Netlify edge functions too that don't have the process.env.NETLIFY_FUNCTIONS_TOKEN environment variable.

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from 00f3037:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/00f30372342b6fff46a1d2b7470d7d4914587e86

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/17044

[changeset-bot]

🦋 Changeset detected

Latest commit: 00f3037

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

This PR includes changesets to release 1 package

Name	Type
@sveltejs/adapter-netlify	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-17044-svelte.vercel.app/

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: QUIET

Plan: Advanced

Run ID: 4483d49c-e20d-4586-8bb8-a74b84280e36

📥 Commits

Reviewing files that changed from the base of the PR and between 056d48f and 00f3037.

📒 Files selected for processing (1)

• .changeset/wicked-masks-end.md

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• sveltejs/vite-plugin-svelte (manual)
• vitejs/vite (manual)
• sveltejs/svelte (manual)

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

---

📝 Walkthrough

Walkthrough

Netlify serverless-function generation now uses positional parameters and creates a per-build UUID for split deployments. Generated split and catch-all modules receive the UUID. Catch-all modules record the incoming request pathname in a UUID-derived header. Split modules restore the pathname from that header before responding. The previous token-based full-URL reconstruction path has been removed.

Merge Risk: ⚪ Minimal · up to 00f30

This release note documents UUID-based pathname restoration for Netlify split functions, including environments without the Netlify function token. No current merge-blocking risk is identified.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Backward Compatibility Impact Disclosure	✅ Passed	The pull request does not introduce a breaking public interface change. The public AdapterOptions declaration remains unchanged, with optional edge and split options and the same defaults. The p…
Title check	✅ Passed	The title uses the required chore: prefix and accurately summarises the main change: replacing Netlify’s function token with a UUID.

---

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