`, favicon, and body of `Root()` to\nmatch your app's existing `index.html`, and stamp anything else your shell\nreferences directly (images, css) with `immutableFileUrl()`.\n\n1. Create `frontend/root.tsx`:\n\n```tsx\n/** @jsxImportSource npm:hono@4/jsx */\nimport { raw } from \"npm:hono@4/html\";\nimport { immutableFileUrl } from \"https://esm.town/v/std/utils/index.ts\";\n\n// The HTML shell for the app. It is never cached, so immutableFileUrl can stamp\n// the current val version into each asset URL — the browser caches those\n// immutably, and publishing the val changes the URLs, refetching exactly once.\nexport function Root() {\n return (\n <>\n {raw(\"<!DOCTYPE html>\")}\n <html lang=\"en\">\n <head>\n <meta charSet=\"UTF-8\" />\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n <title>React Hono Val Town Starter

[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10},"actionData","errors","root",{"_267":268,"_269":270},"routes/_app.x.$handle.$name",{"_98":97,"_31":43,"_107":88,"_26":108,"_13":14,"_109":-5,"_11":110,"_111":112,"_113":114,"_115":116,"_117":118,"_20":-5,"_119":-5,"_120":-5,"_121":24,"_122":123,"_124":57,"_125":-5,"_126":-5,"_127":128},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":-5,"_18":-5},"project",{"_41":42,"_31":43,"_36":44,"_45":-5,"_46":24,"_47":48,"_49":48,"_50":51,"_52":-5,"_18":53,"_54":55,"_56":57,"_58":-5,"_59":-5,"_60":61,"_62":63,"_64":65,"_66":67,"_68":69,"_70":-5,"_71":72,"_73":72,"_74":75,"_76":75,"_77":75,"_78":72,"_79":72,"_80":81,"_82":83,"_84":85,"_86":24},"version",3,"changes",[19],"aiChatInfo","userId",{"_20":21,"_22":-7,"_23":24,"_25":24,"_26":27,"_28":27},"file",{"_29":30,"_31":27,"_32":33,"_34":35,"_36":37,"_38":14,"_39":40,"_23":24},"previous","deleted",false,"deletedHere","path","flights.ts","latestPath","fileId","fcb5f78e-abb9-11f1-ba48-1607ee4eb77e","name","fileType","script","content","// Flight search. Currently returns mock data — no flight API key is\n// configured yet (see README for how to add one for $0/mo on Amadeus).\n// getFlights() is the single function the API route calls; swap its body\n// for a real Amadeus Flight Offers Search call and nothing else changes.\n\nexport interface FlightOption {\n date: string; // ISO date, always a Tuesday\n destination: \"JFK\" | \"LGA\";\n price: number;\n airline: string;\n nonstop: boolean;\n refundable: boolean;\n}\n\nconst DESTINATIONS = [\"JFK\", \"LGA\"] as const;\n\nfunction nextNTuesdays(n: number): string[] {\n const dates: string[] = [];\n const d = new Date();\n d.setUTCHours(0, 0, 0, 0);\n while (d.getUTCDay() !== 2) d.setUTCDate(d.getUTCDate() + 1); // 2 = Tuesday\n for (let i = 0; i < n; i++) {\n dates.push(new Date(d).toISOString().slice(0, 10));\n d.setUTCDate(d.getUTCDate() + 7);\n }\n return dates;\n}\n\n// Deterministic pseudo-random price so mock data is stable across requests.\nfunction mockPrice(seed: string): number {\n let h = 0;\n for (let i = 0; i < seed.length; i++) h = (h * 31 + seed.charCodeAt(i)) >>> 0;\n return 140 + (h % 220); // $140–$360\n}\n\nexport async function getFlights(): Promise {\n const apiKey = Deno.env.get(\"AMADEUS_API_KEY\");\n if (!apiKey) {\n // MOCK MODE — no live data source configured.\n const flights: FlightOption[] = [];\n for (const date of nextNTuesdays(8)) {\n for (const destination of DESTINATIONS) {\n const seed = `${date}-${destination}`;\n flights.push({\n date,\n destination,\n price: mockPrice(seed),\n airline: mockPrice(seed + \"air\") % 3 === 0 ? \"JetBlue\" : \"Delta\",\n nonstop: mockPrice(seed + \"ns\") % 4 !== 0,\n refundable: mockPrice(seed + \"rf\") % 2 === 0,\n });\n }\n }\n return flights;\n }\n\n // TODO: real Amadeus Flight Offers Search call, filtered MSY -> JFK/LGA,\n // Tuesday departures, nonstop, Delta preferred. Fare rules / refundability\n // requires a follow-up call to the Flight Offers Price endpoint per offer.\n throw new Error(\"Live flight API not implemented yet\");\n}\n","createdAt",["D",1788895072216],"branchVersion","branchId","a2d83106-fb23-4e34-a53f-3748660d2df7","id","873d437b-aa07-4a6d-a8ae-cf25fc6517b4","nyc-flight-hotel-finder",["D",1788894971818],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Tuesday Delta fares + NYC boutique hotel finder","imageUrl","051b2cc5-9320-44ef-88e7-826bfa8daa60","pinnedFileId","01a08273-08cb-70b7-9190-4d3348710ba0","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","019ee5b5-1072-70b4-8a0f-c844ad002ea1","tursoName","873d437baa074a6da8aecf25fc6517b4","tursoHostname","873d437baa074a6da8aecf25fc6517b4-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789502486629],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_98":97,"_106":102},"org",{"_98":97,"_99":100,"_101":102,"_18":53,"_103":104,"_105":24},"branch",{"_13":87,"_31":88,"_41":40,"_89":42,"_90":-5,"_91":-5,"_92":-5,"_93":-5,"_94":-5,"_95":43,"_96":97},"isOwned",34,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","unlikelyarchivist","handle","displayName","Eryn Montgomery","avatar","https://lh3.googleusercontent.com/a/ACg8ocJEkHIy674nn2OrWifP7cPPXWj2A5ftzagptlIz_AXo3OPt_A=s96-c","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_41":42,"_31":43,"_36":262,"_45":-5,"_46":24,"_47":48,"_49":48,"_50":51,"_52":-5,"_18":53,"_54":55,"_56":57,"_58":-5,"_59":-5,"_60":61,"_62":63,"_64":65,"_66":67,"_68":263,"_70":-5,"_71":72,"_73":72,"_74":75,"_76":75,"_77":75,"_78":72,"_79":72,"_80":264,"_82":265,"_84":266,"_86":24},"tree",[182,184,191,192,193,194],"files",[182,183,184,185,186,187,188,189,190,191,192,193,194],"counts",{"_172":61,"_173":138,"_174":61,"_175":176,"_177":178},"contents",[129,130,131,132,133,134],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_41":166,"_31":167,"_29":168,"_137":-5,"_39":40,"_38":169,"_139":57,"_36":170,"_13":61,"_32":164,"_34":-5,"_23":24,"_143":-5,"_26":171},{"_41":160,"_31":161,"_29":162,"_137":-5,"_39":40,"_38":138,"_139":57,"_36":163,"_13":61,"_32":164,"_34":-5,"_23":24,"_143":-5,"_26":165},{"_41":154,"_31":155,"_29":156,"_137":-5,"_39":40,"_38":138,"_139":57,"_36":157,"_13":61,"_32":20,"_34":158,"_23":24,"_143":-5,"_26":159},{"_41":148,"_31":149,"_29":150,"_137":-5,"_39":40,"_38":138,"_139":24,"_36":151,"_13":61,"_32":20,"_34":152,"_23":24,"_143":-5,"_26":153},{"_41":145,"_31":27,"_29":30,"_137":-5,"_39":40,"_38":14,"_139":24,"_36":146,"_13":61,"_32":33,"_34":35,"_23":24,"_143":-5,"_26":147},{"_41":135,"_31":136,"_29":55,"_137":-5,"_39":40,"_38":138,"_139":24,"_36":140,"_13":61,"_32":141,"_34":142,"_23":24,"_143":-5,"_26":144},"d108a458-a64a-4b2e-bf42-6b34b163b903","index.ts","parentId",1,"latest",["D",1788894971818],"http","import { parseVal, serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { Root } from \"./frontend/root.tsx\";\n\nconst app = new Hono();\n\n// Serve the (never-cached) HTML shell at the root /\napp.get(\"/\", (c) => c.html(Root()));\n\n// Serve frontend files at the version-addressed URLs Root() stamps, cached immutably\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\n\n// View source redirect\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\n\n// Add your API routes here\n// app.get(\"/api/data\", c => c.json({ hello: \"world\" }));\n\n// Unwrap and rethrow Hono errors as the original error\n// If you delete this, all errors will be \"Internal Server Error\"\napp.onError((err) => Promise.reject(err));\n\n// HTTP vals expect an exported \"fetch handler\"\n// This is how you \"run the server\" in Val Town with Hono\nexport default app.fetch;\n","label",[136],"b3b8c42b-2c1a-42a3-875d-0620553c0c9a",["D",1788895072216],[27],"0fde5e52-9a04-491c-b474-247e072ecbad","README.md","01a08273-08cb-70b7-9190-4871f7cd3cc2",["D",1788894971818],"# React + Hono Starter\n\nA minimal starter template for building client-side React apps with a Hono\nbackend on Val Town. Click **Remix** to get your own copy.\n\n## Picking a starter\n\n| Starter | When to pick it |\n| --- | --- |\n| [`basic-html-starter`](https://www.val.town/x/templates/basic-html-starter) | Static HTML pages. Sprinkle of vanilla JS. No server-side rendering. |\n| [`hono-jsx-starter`](https://www.val.town/x/templates/hono-jsx-starter) | Dynamic server-rendered HTML with JSX. API routes. No React, no SPA. |\n| **[`react-hono-starter`](https://www.val.town/x/templates/react-hono-starter)** *(you're here)* | Client-side React SPA with a Hono API backend. |\n\n**Want to build UI?** Start writing React components in\n[`frontend/components/`](/frontend/components/). Import them into `App.tsx` and\nyou're good to go. Styling is [Twind](https://twind.style/) — just use Tailwind\nutility classes, zero config.\n\n**Want to add an API?** Add routes in [`index.ts`](/index.ts) (there's a\ncommented-out example). Fetch them from your React components.\n\n## Architecture\n\n```mermaid\ngraph LR\n Browser -->|\"GET /\"| Hono[\"index.ts
(Hono server)\"]\n Hono -->|serves| HTML[\"root.tsx\"]\n HTML -->|loads| Entry[\"index.tsx\"]\n Entry -->|renders| App[\"App.tsx\"]\n App -->|renders| Counter[\"Counter.tsx\"]\n```\n\n## File structure\n\n```\nindex.ts ← Hono backend (serves frontend + API routes)\nfrontend/\n root.tsx ← HTML shell (stamps immutable asset URLs)\n index.tsx ← React entrypoint (mounts )\n favicon.svg ← App icon\n components/\n App.tsx ← Root component (layout + view source link)\n Counter.tsx ← Example component with state\n```\n\n## How it works\n\n1. **`index.ts`** is the HTTP entrypoint — a Hono server that serves the\n frontend and any API routes you add.\n2. **`frontend/root.tsx`** is the HTML shell — it loads Twind and stamps\n immutable asset URLs for the favicon and React entrypoint.\n3. **`frontend/index.tsx`** mounts the React app.\n4. **`frontend/components/App.tsx`** is the root layout — add new components\n alongside it.\n5. **`frontend/components/Counter.tsx`** is an example stateful component —\n replace it with your own!\n\n## Next steps\n\n- Add API routes in `index.ts`\n- Add new components in `frontend/components/`\n- Add a SQLite database — see the\n [React Hono Example](https://www.val.town/x/stevekrouse/reactHonoExample) for\n a full-stack example with database, queries, and shared types\n\nTemplate updates and upgrade paths for existing remixes: [CHANGELOG.md](/CHANGELOG.md)\n",[149],"f3cde05a-882d-45c0-9e98-9c86f951c40d","CHANGELOG.md","01a08273-08cb-70b7-9190-443b3ac049cf",["D",1788894971818],"# Changelog\n\n## 2026-07-30 — Immutable asset caching\n\nFrontend files are now served at version-addressed URLs\n(`/__immutable/45/frontend/index.tsx`) with\n`Cache-Control: public, max-age=31536000, immutable`, so repeat visits load the\nwhole client graph from the browser cache — roughly 3× faster (~665ms → ~157ms\nmeasured). Publishing your val bumps its version, which changes every URL, so\ncaches invalidate automatically. Old-version URLs return 404 after a publish\n(like Next.js build assets); a reload picks up the new version.\n\nWhat changed in the template:\n\n- `frontend/index.html` → [`frontend/root.tsx`](/frontend/root.tsx): the HTML\n shell is now JSX and stamps asset URLs with `immutableFileUrl()`\n- [`index.ts`](/index.ts): serves `Root()` at `/`, and one\n `app.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path))` route\n serves all frontend files\n\n### Upgrading an existing remix\n\nYour copy of this template doesn't update automatically. Two options:\n\n**Minimal (most of the benefit):** point both routes at `serveImmutableFile` —\nyour existing bare URLs redirect into versioned space, the new route serves\nthem, and the whole module graph gets cached (costs one redirect per page view):\n\n```ts\nimport { serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\n\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\napp.get(\"/frontend/**/*\", (c) => serveImmutableFile(c.req.path)); // was serveFile\n```\n\n**Full upgrade (also removes the redirect):** three self-contained steps —\nno other files needed. Adjust the ``, favicon, and body of `Root()` to\nmatch your app's existing `index.html`, and stamp anything else your shell\nreferences directly (images, css) with `immutableFileUrl()`.\n\n1. Create `frontend/root.tsx`:\n\n```tsx\n/** @jsxImportSource npm:hono@4/jsx */\nimport { raw } from \"npm:hono@4/html\";\nimport { immutableFileUrl } from \"https://esm.town/v/std/utils/index.ts\";\n\n// The HTML shell for the app. It is never cached, so immutableFileUrl can stamp\n// the current val version into each asset URL — the browser caches those\n// immutably, and publishing the val changes the URLs, refetching exactly once.\nexport function Root() {\n return (\n <>\n {raw(\"<!DOCTYPE html>\")}\n <html lang=\"en\">\n <head>\n <meta charSet=\"UTF-8\" />\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n <title>React Hono Val Town Starter\n

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