verify-live-stack

name

verify-live-stack

description

Verify that wcygan.net production is serving the TanStack Start + Vite build (not a cached SvelteKit deploy or stale worker). Use when debugging "did my deploy land", comparing local vs prod output, confirming a rollback worked, investigating stale content after a push, or diagnosing hydration/routing failures that could be caused by mixed versions. Keywords verify, fingerprint, deploy check, prod, production, tanstack vs sveltekit, __TSR, cache, stale, assets, hydration, rollback verification, which version

Verify Live Stack

Fast checks to confirm production is serving the current TanStack Start + Vite build, not a cached SvelteKit Worker or a stale deploy.

Fingerprint cheat sheet

Signal	TanStack Start (current)	SvelteKit (old)
SSR hydration global	__TSR_ / __TSR_ROUTER_MANIFEST__	__sveltekit_
Asset path prefix	/assets/<name>-<hash>.js	/_app/immutable/entry/start.<hash>.js
Router markers	tsr-scroll-restoration-v, tsr-stream-barrier	Svelte hydration comments <!--[-->
Component chunk names	MermaidDiagram-<hash>.js (React)	Mermaid-<hash>.svelte-<hash>.js
Console probe	window.__TSR_ROUTER_MANIFEST__ is an object	undefined

Any SvelteKit marker on wcygan.net means the deploy didn't land or an old cached response is being served.

One-liner verification

curl -s --compressed https://wcygan.net/ \
  | grep -aoE '(__TSR_|__sveltekit|/assets/|/_app/immutable)' \
  | sort -u

Expected output:

__TSR_
/assets/

If you see __sveltekit or /_app/immutable → old build still live. If you see both → CDN cache mismatch between HTML and assets (purge the zone).

Deeper checks

# Which version is the edge currently serving?
npx wrangler deployments list | tail -20

# Is the response from cache or origin?
curl -sI https://wcygan.net/ | grep -i 'cf-cache-status\|age\|etag'

# Force-miss cache (confirms origin is fresh, not a stale edge copy)
curl -sI https://wcygan.net/ -H 'Cache-Control: no-cache' | grep -i cache-status

# Does this specific post exist as prerendered HTML on the worker?
curl -sI https://wcygan.net/really-good-software/ | head -3

In-browser verification (DevTools)

1. Right-click page → View Page Source (raw server response — NOT Inspect, which shows post-hydration DOM).
2. Cmd+F for __TSR_ (hit = TanStack) and __sveltekit_ (hit = old stack).
3. Network tab → reload → look for /assets/index-*.js. SvelteKit would show /_app/immutable/nodes/0.*.js.
4. Console → type window.__TSR_ROUTER_MANIFEST__. Object = current stack; undefined = old stack or pre-hydration.
5. Application tab → Service Workers. There should be none registered. A leftover SvelteKit service worker is a common cause of "I deployed but still see the old site."

Common failure modes

Symptom	Cause	Fix
Curl shows __TSR_ but browser shows old layout	Service worker cache from SvelteKit era	DevTools → Application → Service Workers → Unregister; or incognito
Curl + browser both show SvelteKit markers	CI deploy didn't land — check wrangler deployments list timestamp against push time	Re-trigger build, or npx wrangler deploy from laptop
/assets/*.js returns 404 while HTML loads	Asset directory mismatch — wrangler.jsonc assets.directory doesn't match actual build output	Verify .output/public/ has assets/ subdir; redeploy
Different version IDs between wrangler versions list and production	Gradual rollout in progress	Wait 60s and recheck; or check Deployments tab for rollout %
New deploy, edge still serves old content for >5min	Zone-level CDN cache outside Workers Assets	Cloudflare dashboard → Caching → Purge Everything

When to reach for this skill

• After a git push that triggered a CI build — confirm it actually shipped
• After npx wrangler rollback — confirm the older version is serving
• When a blog post edit doesn't appear in prod — is it a deploy issue or a cache issue?
• When hydration errors appear in the browser console — could be version skew between HTML and JS chunks
• When switching between the wcygan-net.wcygan-io.workers.dev subdomain and wcygan.net gives different content — DNS vs edge cache diagnostic

Related

• cloudflare-static-deploy — how the deploy gets there in the first place
• wcygan-net-stack — stack reference (TanStack, Deno, MDX, Mermaid)