`, 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",{"_322":323,"_324":325},"routes/_app.x.$handle.$name",{"_99":98,"_31":44,"_108":89,"_26":109,"_13":14,"_110":-5,"_11":111,"_112":113,"_114":115,"_116":117,"_118":119,"_20":-5,"_120":-5,"_121":-5,"_122":24,"_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",{"_42":43,"_31":44,"_37":45,"_46":-5,"_47":24,"_48":49,"_50":49,"_51":52,"_53":-5,"_18":54,"_55":56,"_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":24},"version",14,"changes",[19],"aiChatInfo","userId",{"_20":21,"_22":-7,"_23":24,"_25":24,"_26":27,"_28":27},"file",{"_29":30,"_31":32,"_33":34,"_35":36,"_37":38,"_39":14,"_40":41,"_23":24},"previous","deleted",false,"deletedHere","path","frontend/components/Practice.tsx","latestPath","fileId","12fb4e1a-a6f9-11f1-bcca-1607ee4eb77e","name","Practice.tsx","fileType","script","content","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useEffect, useMemo, useState } from \"https://esm.sh/react@18.2.0\";\nimport { EkgStrip } from \"./EkgStrip.tsx\";\nimport type { RhythmSummary } from \"./RhythmCard.tsx\";\n\nfunction shuffle(arr: T[]): T[] {\n const a = [...arr];\n for (let i = a.length - 1; i > 0; i--) {\n const j = Math.floor(Math.random() * (i + 1));\n [a[i], a[j]] = [a[j], a[i]];\n }\n return a;\n}\n\nfunction pickRound(pool: RhythmSummary[]) {\n const target = pool[Math.floor(Math.random() * pool.length)];\n const sameCategory = pool.filter((r) => r.id !== target.id && r.category === target.category);\n const others = pool.filter((r) => r.id !== target.id && r.category !== target.category);\n const distractors = shuffle([...sameCategory, ...others]).slice(0, 3);\n const choices = shuffle([target, ...distractors]);\n return { target, choices };\n}\n\nexport function Practice(\n { rhythms, onGoPro }: { rhythms: RhythmSummary[]; onGoPro: () => void },\n) {\n const pool = useMemo(() => rhythms.filter((r) => !r.locked), [rhythms]);\n const [round, setRound] = useState(0);\n const [current, setCurrent] = useState<{ target: RhythmSummary; choices: RhythmSummary[] } | null>(null);\n const [picked, setPicked] = useState(null);\n const [stats, setStats] = useState({ correct: 0, total: 0, streak: 0, best: 0 });\n\n useEffect(() => {\n if (pool.length < 4) return;\n setCurrent(pickRound(pool));\n setPicked(null);\n // eslint-disable-next-line react-hooks/exhaustive-deps\n }, [round, pool.length]);\n\n if (pool.length < 4) {\n return (\n

Not enough free rhythms unlocked yet to run practice mode.

\n );\n }\n\n if (!current) return

Loading a strip…

;\n\n function choose(id: string) {\n if (picked) return;\n setPicked(id);\n setStats((s) => {\n const correct = id === current!.target.id;\n const streak = correct ? s.streak + 1 : 0;\n return {\n correct: s.correct + (correct ? 1 : 0),\n total: s.total + 1,\n streak,\n best: Math.max(s.best, streak),\n };\n });\n }\n\n const isCorrect = picked === current.target.id;\n\n return (\n

\n \n {stats.correct} / {stats.total} correct\n {stats.total > 0 && ` (${Math.round((stats.correct / stats.total) * 100)}%)`}\n \n \n 🔥 Streak {stats.streak}\n {stats.best > 0 && ` · best ${stats.best}`}\n \n

\n\n

What rhythm is this?

\n \n\n

\n {current.choices.map((c) => {\n let cls = \"border-slate-200 bg-white hover:border-sky-300\";\n if (picked) {\n if (c.id === current.target.id) cls = \"border-emerald-400 bg-emerald-50\";\n else if (c.id === picked) cls = \"border-red-300 bg-red-50\";\n else cls = \"border-slate-200 bg-white opacity-60\";\n }\n return (\n choose(c.id)}\n class={`text-left rounded-lg border p-3 text-sm font-medium transition ${cls}`}\n >\n {c.name}\n \n );\n })}\n

\n\n {picked && (\n

\n {isCorrect ? \"Correct\" : `Not quite — this was ${current.target.name}`}\n

\n {current.target.rate} · {current.target.regularity}. {current.target.summary}\n

\n setRound((r) => r + 1)}\n class=\"mt-3 rounded-lg bg-sky-600 text-white font-medium px-4 py-2 text-sm hover:bg-sky-700\"\n >\n Next strip →\n \n

\n )}\n\n

\n Practicing on the {pool.length} free rhythms.{\" \"}\n \n

\n );\n}\n","createdAt",["D",1788372412004],"branchVersion","branchId","7029bff5-bb8a-442e-a4f2-805f0156bd56","id","4a26e4ff-5701-4f0e-a2d1-9b438dea196d","ekg-rhythm-practice",["D",1788371332863],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","EKG rhythm interpretation practice app for nursing/EMS students","imageUrl","f88a0ee3-b2a2-4b50-b1cd-d6ef9333f8b4","pinnedFileId","01a0633c-efa7-770e-92de-fcbd716f9193","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","01a0633a-cac3-709b-a980-c6cbc53d1693","tursoName","4a26e4ff57014f0ea2d19b438dea196d","tursoHostname","4a26e4ff57014f0ea2d19b438dea196d-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789500689328],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_99":98,"_107":103},"org",{"_99":98,"_100":101,"_102":103,"_18":54,"_104":105,"_106":24},"branch",{"_13":88,"_31":89,"_42":41,"_90":43,"_91":-5,"_92":-5,"_93":-5,"_94":-5,"_95":-5,"_96":44,"_97":98},"isOwned",55,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","dusty_medic","handle","displayName","Peter Sulzinski","avatar","https://lh3.googleusercontent.com/a/ACg8ocKxS7SIQL-2xeZae3OPJraIhveBUDOK84i99c574FL5C5flzw=s96-c","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_42":43,"_31":44,"_37":317,"_46":-5,"_47":24,"_48":49,"_50":49,"_51":52,"_53":-5,"_18":54,"_55":56,"_57":58,"_59":-5,"_60":-5,"_61":62,"_63":64,"_65":66,"_67":68,"_69":318,"_71":-5,"_72":73,"_74":73,"_75":76,"_77":76,"_78":76,"_79":73,"_80":73,"_81":319,"_83":320,"_85":321,"_87":24},"tree",[180,182,196,197,198],"files",[180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198],"counts",{"_170":62,"_171":141,"_172":62,"_173":174,"_175":176},"contents",[130,131,132,133,134],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_42":164,"_31":165,"_29":166,"_137":-5,"_40":41,"_39":167,"_139":58,"_37":168,"_13":62,"_33":162,"_35":-5,"_23":24,"_144":-5,"_26":169},{"_42":158,"_31":159,"_29":160,"_137":-5,"_40":41,"_39":141,"_139":58,"_37":161,"_13":62,"_33":162,"_35":-5,"_23":24,"_144":-5,"_26":163},{"_42":152,"_31":153,"_29":154,"_137":-5,"_40":41,"_39":141,"_139":58,"_37":155,"_13":62,"_33":20,"_35":156,"_23":24,"_144":-5,"_26":157},{"_42":146,"_31":147,"_29":148,"_137":-5,"_40":41,"_39":141,"_139":58,"_37":149,"_13":62,"_33":20,"_35":150,"_23":24,"_144":-5,"_26":151},{"_42":135,"_31":136,"_29":56,"_137":-5,"_40":41,"_39":138,"_139":24,"_37":140,"_13":141,"_33":142,"_35":143,"_23":24,"_144":-5,"_26":145},"2a3bb751-e5fe-4f8c-83a9-856f8f9551e0","index.ts","parentId",3,"latest",["D",1788371714109],1,"http","import { parseVal, serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { Root } from \"./frontend/root.tsx\";\nimport { RHYTHMS } from \"./backend/rhythms-data.ts\";\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// List all rhythms (summary only — no questions in the payload)\napp.get(\"/api/rhythms\", (c) => {\n const list = [...RHYTHMS]\n .sort((a, b) => a.sortOrder - b.sortOrder)\n .map(({ questions, ...summary }) => ({\n ...summary,\n locked: !summary.free,\n questionCount: questions.length,\n }));\n return c.json(list);\n});\n\n// Single rhythm detail. Questions are only included for free rhythms —\n// Pro-gated rhythms return everything except the quiz content itself.\napp.get(\"/api/rhythms/:id\", (c) => {\n const rhythm = RHYTHMS.find((r) => r.id === c.req.param(\"id\"));\n if (!rhythm) return c.json({ error: \"not found\" }, 404);\n const locked = !rhythm.free;\n return c.json({\n ...rhythm,\n locked,\n questions: locked ? [] : rhythm.questions,\n });\n});\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],"f174df99-6739-437c-b218-528fe54153d7","README.md","01a0633c-efa7-770e-92de-f8c87a88692d",["D",1788371332863],"# 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",[147],"4d03780d-716e-4f3b-9cdf-f3d72852a379","CHANGELOG.md","01a0633c-efa7-770e-92de-f742abd282c5",["D",1788371332863],"# 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

Diff · v14