[SLOP(claude-opus-4-8)] fix(kitchen-sink): serve built frontend from server

[MasterPtato]

No description provided.

[MasterPtato]

Stack for rivet-dev/rivet

• #5552 [slopfix] fix(universaldb): match fdb conflict semantics in …
• #5551 [slopfix] fix(universaldb,util,pegboard-envoy): index dedup …
• #5398 feat(kitchen-sink): add churnDb actor and seed driver for co …
• #5397 chore: Clean up
• #5382 [slopfix] docs(self-hosting): correct postgres config format …
• #5356 [slopfix] fix(pegboard): decrement kv_storage_used metric on …
• #5354 [slopfix] refactor(universaldb,ups): single/multi-node udb o …
• #5353 [slopfix] perf(universaldb): fold postgres drain_batch into …
• #5342 [SLOP(claude-opus-4-8-high)] perf(universaldb): batch leader …
• #5341 [slopfix] docs(self-hosting): promote postgres from experime …
• #5340 [slopfix] fix(self-host): repair dev compose generation, kit …
• #5337 [SLOP(claude-opus-4-8-high)] feat(universaldb): graceful pos …
• #5336 [slopfix] test(universaldb): postgres leader failover + abor …
• #5335 [SLOP(claude-opus-4-8-high)] feat(ups): table-backed postgre …
• #5329 [SLOP(claude-opus-4-8-high)] feat(universaldb): postgres lea …
• #5327 [SLOP(claude-opus-4-8)] feat(pegboard-envoy): rate-limit env …
• #5326 [SLOP(claude-opus-4-8)] feat(util): add rate limiter primiti …
• #5322 [SLOP(claude-opus-4-8)] feat(rivetkit-core): add serde durat …
• #5321 Add observation for serde_bare
• #5320 Add observation and ser/de metrics for serde calls
• #5314 [SLOP(claude-opus-4-8-medium)] chore: add profiling cargo pr …
• #5306 [SLOP(claude-opus-4-8)] fix(kitchen-sink): serve built front … 👈
• main

Get stack: forklift get 5306
Push local edits: forklift submit
Merge when ready: forklift merge 5306

_{change rymmurrk}

[railway-app]

🚅 Deployed to the rivet-pr-5306 environment in rivet-frontend

Service	Status	Web	Updated (UTC)
website	😴 Sleeping (View Logs)	Web	Aug 7, 2026 at 11:59 pm
frontend-cloud	😴 Sleeping (View Logs)	Web	Aug 7, 2026 at 5:48 pm
kitchen-sink	😴 Sleeping (View Logs)	Web	Aug 7, 2026 at 8:00 am
frontend-inspector	😴 Sleeping (View Logs)	Web	Aug 6, 2026 at 9:38 pm
ladle	✅ Success (View Logs)	Web	Jun 19, 2026 at 1:08 am
mcp-hub	✅ Success (View Logs)	Web	Jun 19, 2026 at 1:05 am

[claude]

Code Review

Small, focused change that adds built-frontend serving to the kitchen-sink example. The approach is sound; route ordering is correct so /api/rivet and the debug routes still take precedence in serverless modes.

Observations:

Hono path access — new URL(c.req.url).pathname allocates a full URL object just to get the path. Hono exposes c.req.path directly:

// current
const path = new URL(c.req.url).pathname;
const last = path.slice(path.lastIndexOf("/") + 1);

// simpler
const last = c.req.path.split("/").at(-1) ?? "";

Minor, but worth fixing since this runs on every unmatched request.

Extension heuristic — last.includes(".") catches most asset paths but would incorrectly 404 on paths like /v1.0/feature. A tighter check for known static extensions, or checking whether serveStatic already produced a response, would be more robust. Probably acceptable for a kitchen-sink example.

serverful mode masks a stray-request 404 — the new catch-all is unconditional on mode. In serverful mode, /api/rivet/* never gets a route registered (see the comment above the if (mode === "serverful") block: stray hits there are considered unwanted). Before this change such a request 404d; now it falls through the static middleware (no match) into the SPA app.get("/*", ...) handler and returns a 200 with index.html instead. Low impact for an example app, but worth a conscious call, either scope the SPA fallback to non-serverful modes or note that this is intentional.

Comment style — the opening block comment explains what the code does rather than why (per CLAUDE.md: do not explain what the code does when it is already obvious from reading it). The one non-obvious fact worth keeping is that dist/ only exists in production images:

// dist/ only exists in production images; dev runs skip this block.

readFileSync at startup — reading index.html once at startup rather than per-request is the right call for a long-lived process.

Overall this is a clean, minimal addition. The c.req.path nit and the serverful-mode fallback behavior are the two things worth a second look before merging.