`, 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",{"_258":259,"_260":261},"routes/_app.x.$handle.$name",{"_99":98,"_32":45,"_108":89,"_27":109,"_13":14,"_110":-5,"_11":111,"_112":113,"_114":115,"_116":117,"_118":119,"_20":-5,"_120":-5,"_121":-5,"_122":25,"_123":124,"_125":58,"_126":-5,"_127":-5,"_128":129},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":-5,"_18":-5},"project",{"_43":44,"_32":45,"_38":46,"_47":-5,"_48":25,"_49":50,"_51":50,"_52":53,"_54":-5,"_18":55,"_56":31,"_57":58,"_59":-5,"_60":-5,"_61":62,"_63":64,"_65":66,"_67":68,"_69":70,"_71":-5,"_72":73,"_74":73,"_75":76,"_77":76,"_78":76,"_79":73,"_80":73,"_81":82,"_83":84,"_85":86,"_87":25},"version",3,"changes",[19],"aiChatInfo","userId",{"_20":21,"_22":23,"_24":25,"_26":25,"_27":28,"_29":28},"file",{"_30":31,"_32":28,"_33":34,"_35":37,"_38":39,"_40":14,"_41":42,"_24":25},"previous",{"_30":31,"_32":28,"_33":34,"_35":36},"deleted",false,"deletedHere","path","index.ts","latestPath","fileId","01a0aa9e-8d5a-722e-8769-8ed17bf83441","name","fileType","http","content","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","import { parseVal, serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { Root } from \"./frontend/root.tsx\";\nimport { compileShot } from \"./lib/engine.ts\";\n\nconst app = new Hono();\n\napp.get(\"/\", (c) => c.html(Root()));\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\n\napp.get(\"/api/health\", (c) => c.json({ ok: true, service: \"reality-camera-studio\", generation: \"provider-ready\" }));\n\napp.post(\"/api/compile\", async (c) => {\n const body = await c.req.json().catch(() => ({}));\n const spec = {\n prompt: typeof body.prompt === \"string\" ? body.prompt : \"\",\n mode: body.mode === \"video\" ? \"video\" : \"image\",\n aspect: typeof body.aspect === \"string\" ? body.aspect : \"9:16\",\n duration: Number.isFinite(Number(body.duration)) ? Math.max(1, Math.min(20, Number(body.duration))) : 5,\n lens: Number.isFinite(Number(body.lens)) ? Math.max(14, Math.min(200, Number(body.lens))) : 50,\n aperture: Number.isFinite(Number(body.aperture)) ? Math.max(1.2, Math.min(22, Number(body.aperture))) : 2.8,\n iso: Number.isFinite(Number(body.iso)) ? Math.max(50, Math.min(12800, Number(body.iso))) : 400,\n shutter: typeof body.shutter === \"string\" ? body.shutter : \"1/120\",\n realism: Number.isFinite(Number(body.realism)) ? Math.max(70, Math.min(100, Number(body.realism))) : 95,\n motion: Number.isFinite(Number(body.motion)) ? Math.max(0, Math.min(100, Number(body.motion))) : 45,\n reference: Boolean(body.reference),\n } as const;\n const plan = compileShot(spec);\n if (plan.warnings.length) return c.json({ ok: false, plan, error: plan.warnings.join(\" \") }, 400);\n return c.json({ ok: true, plan, status: \"compiled\", providerConfigured: Boolean(Deno.env.get(\"GENERATION_PROVIDER_URL\")) });\n});\n\napp.onError((err) => Promise.reject(err));\nexport default app.fetch;\n","createdAt",["D",1789569081792],"branchVersion","branchId","a7613ece-a578-4724-aebc-be9a4598ab48","id","8f282234-7b21-4835-8dfe-b11376415cdd","reality-camera-studio",["D",1789568911615],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Photorealistic image and video generation studio","imageUrl","60cfc669-b7f7-4ed6-aa69-72dac2809e21","pinnedFileId","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","01a0aa9d-1e4a-71cf-a458-950b0565fe64","tursoName","8f2822347b2148358dfeb11376415cdd","tursoHostname","8f2822347b2148358dfeb11376415cdd-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789655476524],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_99":98,"_107":103},"org",{"_99":98,"_100":101,"_102":103,"_18":55,"_104":105,"_106":25},"branch",{"_13":88,"_32":89,"_43":42,"_90":44,"_91":-5,"_92":-5,"_93":-5,"_94":-5,"_95":-5,"_96":45,"_97":98},"isOwned",9,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","juniorsainte","handle","displayName","Junior Sainte","avatar","https://lh3.googleusercontent.com/a/ACg8ocIPymqHBXqXNjY5_9CwfNeROgzXBXPMaAKC5e0aKPa0mI-8HQ=s96-c","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_43":44,"_32":45,"_38":253,"_47":-5,"_48":25,"_49":50,"_51":50,"_52":53,"_54":-5,"_18":55,"_56":31,"_57":58,"_59":-5,"_60":-5,"_61":62,"_63":64,"_65":66,"_67":68,"_69":254,"_71":-5,"_72":73,"_74":73,"_75":76,"_77":76,"_78":76,"_79":73,"_80":73,"_81":255,"_83":256,"_85":257,"_87":25},"tree",[176,183,185,186,187],"files",[176,177,178,179,180,181,182,183,184,185,186,187],"counts",{"_166":62,"_167":139,"_168":62,"_169":170,"_171":172},"contents",[130,131,132,133,134],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_43":161,"_32":162,"_30":163,"_136":-5,"_41":42,"_40":139,"_137":58,"_38":164,"_13":62,"_33":159,"_35":-5,"_24":25,"_140":-5,"_27":165},{"_43":154,"_32":155,"_30":156,"_136":-5,"_41":42,"_40":157,"_137":58,"_38":158,"_13":62,"_33":159,"_35":-5,"_24":25,"_140":-5,"_27":160},{"_43":148,"_32":149,"_30":150,"_136":-5,"_41":42,"_40":139,"_137":58,"_38":151,"_13":62,"_33":20,"_35":152,"_24":25,"_140":-5,"_27":153},{"_43":142,"_32":143,"_30":144,"_136":-5,"_41":42,"_40":139,"_137":58,"_38":145,"_13":62,"_33":20,"_35":146,"_24":25,"_140":-5,"_27":147},{"_43":135,"_32":28,"_30":31,"_136":-5,"_41":42,"_40":14,"_137":25,"_38":138,"_13":139,"_33":34,"_35":37,"_24":25,"_140":-5,"_27":141},"28df943b-3402-4d99-9cd3-93390513869a","parentId","latest",["D",1789569081792],1,"label",[28],"376b80e5-7c37-45a8-a51a-e562c9406fbb","README.md","01a0aa9e-8d5a-722e-8769-8ac07fe559cb",["D",1789568911615],"# 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",[143],"4ff7678a-ba44-4ba0-a0de-8d0c28ac3037","CHANGELOG.md","01a0aa9e-8d5a-722e-8769-8400a3ccb6a2",["D",1789568911615],"# 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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