`, 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",{"_272":273,"_274":275},"routes/_app.x.$handle.$name",{"_101":100,"_32":46,"_110":91,"_27":111,"_13":14,"_112":-5,"_11":113,"_114":115,"_116":117,"_118":119,"_120":121,"_20":-5,"_122":-5,"_123":-5,"_124":25,"_125":126,"_127":60,"_128":-5,"_129":-5,"_130":131},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":-5,"_18":-5},"project",{"_44":45,"_32":46,"_39":47,"_48":-5,"_49":25,"_50":51,"_52":51,"_53":54,"_55":-5,"_18":56,"_57":58,"_59":60,"_61":-5,"_62":-5,"_63":64,"_65":66,"_67":68,"_69":70,"_71":72,"_73":-5,"_74":75,"_76":75,"_77":78,"_79":78,"_80":78,"_81":75,"_82":75,"_83":84,"_85":86,"_87":88,"_89":25},"version",21,"changes",[19],"aiChatInfo","userId",{"_20":21,"_22":23,"_24":25,"_26":25,"_27":28,"_29":28},"file",{"_30":31,"_32":33,"_34":35,"_36":38,"_39":40,"_41":14,"_42":43,"_24":25},"previous",{"_30":31,"_32":33,"_34":35,"_36":37},"deleted",false,"deletedHere","path","frontend/components/Flashcards.tsx","latestPath","fileId","586334b2-b15e-11f1-8c09-1607ee4eb77e","name","Flashcards.tsx","fileType","script","content","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport React, { useState } from \"https://esm.sh/react@18.2.0\";\n\nconst FIRST = 50;\nconst LAST = 99;\nconst MULTIPLIERS = Array.from({ length: LAST - FIRST + 1 }, (_, i) => FIRST + i);\n\n// breakInside keeps a card from being sliced across two columns; perspective is\n// what gives the flip depth instead of a flat squash.\nconst CARD_STYLE = {\n breakInside: \"avoid\",\n WebkitColumnBreakInside: \"avoid\",\n perspective: \"600px\",\n} as const;\n\nfunction Card({ n, flipped, onFlip }: { n: number; flipped: boolean; onFlip: () => void }) {\n return (\n \n \n \n 22 × {n}\n \n \n {n * 22}\n \n \n \n );\n}\n\nexport function Flashcards() {\n const [flipped, setFlipped] = useState>({});\n\n const flippedCount = MULTIPLIERS.filter((n) => flipped[n]).length;\n const allFlipped = flippedCount === MULTIPLIERS.length;\n\n function toggle(n: number) {\n setFlipped((prev) => ({ ...prev, [n]: !prev[n] }));\n }\n\n function setAll(value: boolean) {\n setFlipped(value ? Object.fromEntries(MULTIPLIERS.map((n) => [n, true])) : {});\n }\n\n return (\n

\n Tap a card to flip it.\n

\n setAll(!allFlipped)}\n className=\"text-sm font-medium text-indigo-600 hover:text-indigo-800\"\n >\n {allFlipped ? \"Hide all\" : \"Reveal all\"}\n \n

\n\n

\n {MULTIPLIERS.map((n) => (\n toggle(n)} />\n ))}\n

\n );\n}\n","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport React, { useState } from \"https://esm.sh/react@18.2.0\";\n\nconst FIRST = 50;\nconst LAST = 99;\nconst MULTIPLIERS = Array.from({ length: LAST - FIRST + 1 }, (_, i) => FIRST + i);\n\n// One column per decade, so every column is topped by a round number: 50, 60,\n// 70, 80, 90. CSS multi-column balances by height instead and can't promise\n// that, so the columns are laid out explicitly.\nconst DECADES = Array.from(\n { length: (LAST + 1 - FIRST) / 10 },\n (_, i) => MULTIPLIERS.slice(i * 10, i * 10 + 10),\n);\n\n// perspective is what gives the flip depth instead of a flat squash.\nconst CARD_STYLE = { perspective: \"600px\" } as const;\n\nfunction Card({ n, flipped, onFlip }: { n: number; flipped: boolean; onFlip: () => void }) {\n return (\n \n \n \n 22 × {n}\n \n \n {n * 22}\n \n \n \n );\n}\n\nexport function Flashcards() {\n const [flipped, setFlipped] = useState>({});\n\n const flippedCount = MULTIPLIERS.filter((n) => flipped[n]).length;\n const allFlipped = flippedCount === MULTIPLIERS.length;\n\n function toggle(n: number) {\n setFlipped((prev) => ({ ...prev, [n]: !prev[n] }));\n }\n\n function setAll(value: boolean) {\n setFlipped(value ? Object.fromEntries(MULTIPLIERS.map((n) => [n, true])) : {});\n }\n\n return (\n

\n Tap a card to flip it.\n

\n setAll(!allFlipped)}\n className=\"text-sm font-medium text-indigo-600 hover:text-indigo-800\"\n >\n {allFlipped ? \"Hide all\" : \"Reveal all\"}\n \n

\n\n

\n {MULTIPLIERS.map((n) => (\n toggle(n)} />\n ))}\n

\n );\n}\n","createdAt",["D",1789515568524],"branchVersion","branchId","e0f80498-67e9-4f35-aca0-9591bdedc657","id","692d027a-35b9-48ea-8f8d-613e89421644","multiplier-22",["D",1789455549919],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","30-second 2-digit x 22 mental math drill with leaderboard","imageUrl","4672fa32-1c6f-4907-899e-57b7e45b1dcb","pinnedFileId","01a0a3dc-c647-7481-bcdc-6036d51d1292","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","019e83d1-d41f-725b-9693-b632d430a029","tursoName","692d027a35b948ea8f8d613e89421644","tursoHostname","692d027a35b948ea8f8d613e89421644-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789542643120],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_101":100,"_109":105},"org",{"_101":100,"_102":103,"_104":105,"_18":56,"_106":107,"_108":25},"branch",{"_13":90,"_32":91,"_44":43,"_92":45,"_93":-5,"_94":-5,"_95":-5,"_96":-5,"_97":-5,"_98":46,"_99":100},"isOwned",24,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","potluck","handle","displayName","Potluck Mittal","avatar","https://lh3.googleusercontent.com/a/ACg8ocJYeiSQ8_eyVYtUAg9f5qRwEXzS1AreFm572a1csvZx7c6b_S8=s96-c","tier","pro","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_44":45,"_32":46,"_39":267,"_48":-5,"_49":25,"_50":51,"_52":51,"_53":54,"_55":-5,"_18":56,"_57":58,"_59":60,"_61":-5,"_62":-5,"_63":64,"_65":66,"_67":68,"_69":70,"_71":268,"_73":-5,"_74":75,"_76":75,"_77":78,"_79":78,"_80":78,"_81":75,"_82":75,"_83":269,"_85":270,"_87":271,"_89":25},"tree",[183,185,193,194,195],"files",[183,184,185,186,187,188,189,190,191,192,193,194,195],"counts",{"_173":64,"_174":152,"_175":64,"_176":177,"_178":179},"contents",[132,133,134,135,136],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_44":168,"_32":169,"_30":170,"_139":-5,"_42":43,"_41":143,"_141":60,"_39":171,"_13":64,"_34":166,"_36":-5,"_24":25,"_146":-5,"_27":172},{"_44":162,"_32":163,"_30":164,"_139":-5,"_42":43,"_41":152,"_141":60,"_39":165,"_13":64,"_34":166,"_36":-5,"_24":25,"_146":-5,"_27":167},{"_44":156,"_32":157,"_30":158,"_139":-5,"_42":43,"_41":152,"_141":60,"_39":159,"_13":64,"_34":20,"_36":160,"_24":25,"_146":-5,"_27":161},{"_44":149,"_32":150,"_30":151,"_139":-5,"_42":43,"_41":152,"_141":60,"_39":153,"_13":64,"_34":20,"_36":154,"_24":25,"_146":-5,"_27":155},{"_44":137,"_32":138,"_30":58,"_139":-5,"_42":43,"_41":140,"_141":60,"_39":142,"_13":143,"_34":144,"_36":145,"_24":25,"_146":147,"_27":148},"8092be04-a495-4c29-a077-522b19ca288b","index.ts","parentId",11,"latest",["D",1789455889033],2,"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 { addScore, topScores } from \"./backend/db.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\napp.get(\"/api/scores\", async (c) => c.json({ top: await topScores() }));\n\napp.post(\"/api/scores\", async (c) => {\n const body = await c.req.json().catch(() => null) as\n | { name?: unknown; score?: unknown }\n | null;\n if (!body) return c.json({ error: \"Invalid JSON body\" }, 400);\n\n const name = String(body.name ?? \"\").trim().slice(0, 24) || \"Anonymous\";\n const score = Number(body.score);\n // Well clear of any human 30s run, but still rejects obvious junk.\n if (!Number.isInteger(score) || score < 0 || score > 150) {\n return c.json({ error: \"Invalid score\" }, 400);\n }\n\n return c.json({ top: await addScore(name, score) });\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","22-multiplier",[138],"85af1ecc-bdee-4b2c-a287-0f1f6de1cd3d","README.md","01a0a3dc-c647-7481-bcdc-5e16e7579a26",1,["D",1789455549919],"# 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",[150],"09bafdcb-6f11-46ef-b287-a2ec624d191f","CHANGELOG.md","01a0a3dc-c647-7481-bcdc-595098fcdb90",["D",1789455549919],"# 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 · v21