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Driven off a wall-clock deadline so a throttled tab can't gain time.\n useEffect(() => {\n if (phase !== \"playing\") return;\n const deadline = Date.now() + ROUND_MS;\n let raf = 0;\n const tick = () => {\n const left = deadline - Date.now();\n if (left <= 0) {\n setMsLeft(0);\n setPhase(\"done\");\n return;\n }\n setMsLeft(left);\n raf = requestAnimationFrame(tick);\n };\n raf = requestAnimationFrame(tick);\n return () => cancelAnimationFrame(raf);\n }, [phase]);\n\n useEffect(() => {\n if (phase === \"playing\") inputRef.current?.focus();\n }, [phase]);\n\n // Save the finished run, then refresh the board from the server's answer.\n useEffect(() => {\n if (phase !== \"done\") return;\n let cancelled = false;\n setSaveError(null);\n fetch(\"/api/scores\", {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({ name: name.trim(), score: scoreRef.current }),\n })\n .then((r) => r.ok ? r.json() : Promise.reject(new Error(String(r.status))))\n .then((d) => {\n if (!cancelled) setTop(d.top);\n })\n .catch(() => {\n if (!cancelled) setSaveError(\"Couldn't save that run.\");\n });\n return () => {\n cancelled = true;\n };\n }, [phase]);\n\n function start() {\n const trimmed = name.trim();\n try {\n localStorage.setItem(NAME_KEY, trimmed);\n } catch { /* private mode */ }\n scoreRef.current = 0;\n setScore(0);\n setTyped(\"\");\n setN(randomTwoDigit());\n setMsLeft(ROUND_MS);\n setPhase(\"playing\");\n }\n\n const answer = String(n * 22);\n\n // Type freely; a correct number advances on its own. Nothing is ever marked\n // wrong and nothing is silently deleted — backspace is yours to use.\n //\n // Both branches write the DOM input directly as well as setting state. When\n // the next state equals the current one React skips the re-render, and the\n // browser then keeps whatever was typed — which used to leave the field\n // permanently out of sync with `typed` and stop the round ever scoring again.\n function onType(raw: string) {\n const value = raw.replace(/\\D/g, \"\").slice(0, ANSWER_MAX_DIGITS);\n const next = value === answer ? \"\" : value;\n\n if (value === answer) {\n scoreRef.current += 1;\n setScore(scoreRef.current);\n setN((prev) => randomTwoDigit(prev));\n }\n\n setTyped(next);\n if (inputRef.current) inputRef.current.value = next;\n }\n\n const seconds = (msLeft / 1000).toFixed(1);\n const pct = (msLeft / ROUND_MS) * 100;\n\n return (\n

× 22

\n Multiply by 22. 30 seconds. Go.\n

\n\n {phase === \"idle\" && (\n

\n \n Your name\n \n setName(e.target.value)}\n onKeyDown={(e) => {\n if (e.key === \"Enter\" && name.trim()) start();\n }}\n maxLength={24}\n placeholder=\"Who's playing?\"\n className=\"w-full px-4 py-3 border border-gray-300 rounded-xl focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-transparent\"\n />\n \n Start\n \n

\n )}\n\n {phase === \"playing\" && (\n

\n \n Correct {score}\n \n {seconds}s\n

\n \n

\n\n

\n {n} × 22\n

\n\n onType(e.target.value)}\n onBlur={() => inputRef.current?.focus()}\n inputMode=\"numeric\"\n autoComplete=\"off\"\n aria-label=\"Answer\"\n className=\"w-full text-center text-4xl font-bold tabular-nums px-4 py-3 border-2 border-gray-300 rounded-xl focus:outline-none focus:border-indigo-500\"\n />\n

\n Right answers advance on their own. Backspace to fix a typo.\n

\n )}\n\n {phase === \"done\" && (\n

Time

{score}

\n correct in 30 seconds{score > 0 && `, ${(30 / score).toFixed(1)}s each`}\n

\n {saveError &&

{saveError}

}\n \n Play again\n \n setPhase(\"idle\")}\n className=\"w-full mt-2 text-sm text-gray-500 hover:text-gray-800 py-2\"\n >\n Change name\n \n

\n )}\n\n \n\n

\n View source\n

\n );\n}\n","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport React, { useEffect, useRef, useState } from \"https://esm.sh/react@18.2.0\";\nimport { Leaderboard, type ScoreRow } from \"./Leaderboard.tsx\";\nimport { Flashcards } from \"./Flashcards.tsx\";\n\nconst ROUND_MS = 30_000;\nconst NAME_KEY = \"multiplier22.name\";\n// Answers run 10×22=220 to 99×22=2178, so never more than four digits.\nconst ANSWER_MAX_DIGITS = 4;\n\ntype Phase = \"idle\" | \"playing\" | \"done\";\ntype Mode = \"play\" | \"practice\";\n\nfunction randomTwoDigit(exclude?: number): number {\n let n = 10 + Math.floor(Math.random() * 90);\n while (n === exclude) n = 10 + Math.floor(Math.random() * 90);\n return n;\n}\n\nexport function App() {\n const [name, setName] = useState(\"\");\n const [phase, setPhase] = useState(\"idle\");\n const [n, setN] = useState(() => randomTwoDigit());\n const [typed, setTyped] = useState(\"\");\n const [score, setScore] = useState(0);\n const [msLeft, setMsLeft] = useState(ROUND_MS);\n const [top, setTop] = useState(null);\n const [saveError, setSaveError] = useState(null);\n\n const inputRef = useRef(null);\n const scoreRef = useRef(0);\n\n // Remember the player's name between rounds.\n useEffect(() => {\n try {\n setName(localStorage.getItem(NAME_KEY) ?? \"\");\n } catch { /* private mode */ }\n }, []);\n\n useEffect(() => {\n fetch(\"/api/scores\")\n .then((r) => r.json())\n .then((d) => setTop(d.top))\n .catch(() => setTop([]));\n }, []);\n\n // The clock. Driven off a wall-clock deadline so a throttled tab can't gain time.\n useEffect(() => {\n if (phase !== \"playing\") return;\n const deadline = Date.now() + ROUND_MS;\n let raf = 0;\n const tick = () => {\n const left = deadline - Date.now();\n if (left <= 0) {\n setMsLeft(0);\n setPhase(\"done\");\n return;\n }\n setMsLeft(left);\n raf = requestAnimationFrame(tick);\n };\n raf = requestAnimationFrame(tick);\n return () => cancelAnimationFrame(raf);\n }, [phase]);\n\n useEffect(() => {\n if (phase === \"playing\") inputRef.current?.focus();\n }, [phase]);\n\n // Save the finished run, then refresh the board from the server's answer.\n useEffect(() => {\n if (phase !== \"done\") return;\n let cancelled = false;\n setSaveError(null);\n fetch(\"/api/scores\", {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({ name: name.trim(), score: scoreRef.current }),\n })\n .then((r) => r.ok ? r.json() : Promise.reject(new Error(String(r.status))))\n .then((d) => {\n if (!cancelled) setTop(d.top);\n })\n .catch(() => {\n if (!cancelled) setSaveError(\"Couldn't save that run.\");\n });\n return () => {\n cancelled = true;\n };\n }, [phase]);\n\n function start() {\n const trimmed = name.trim();\n try {\n localStorage.setItem(NAME_KEY, trimmed);\n } catch { /* private mode */ }\n scoreRef.current = 0;\n setScore(0);\n setTyped(\"\");\n setN(randomTwoDigit());\n setMsLeft(ROUND_MS);\n setPhase(\"playing\");\n }\n\n const answer = String(n * 22);\n\n // Type freely; a correct number advances on its own. Nothing is ever marked\n // wrong and nothing is silently deleted — backspace is yours to use.\n //\n // Both branches write the DOM input directly as well as setting state. When\n // the next state equals the current one React skips the re-render, and the\n // browser then keeps whatever was typed — which used to leave the field\n // permanently out of sync with `typed` and stop the round ever scoring again.\n function onType(raw: string) {\n const value = raw.replace(/\\D/g, \"\").slice(0, ANSWER_MAX_DIGITS);\n const next = value === answer ? \"\" : value;\n\n if (value === answer) {\n scoreRef.current += 1;\n setScore(scoreRef.current);\n setN((prev) => randomTwoDigit(prev));\n }\n\n setTyped(next);\n if (inputRef.current) inputRef.current.value = next;\n }\n\n const seconds = (msLeft / 1000).toFixed(1);\n const pct = (msLeft / ROUND_MS) * 100;\n\n return (\n

× 22

\n Multiply by 22. 30 seconds. Go.\n

\n\n {phase === \"idle\" && (\n

\n )}\n\n {phase === \"playing\" && (\n

\n \n Correct {score}\n \n {seconds}s\n

\n \n

\n\n

\n {n} × 22\n

\n Right answers advance on their own. Backspace to fix a typo.\n

\n )}\n\n {phase === \"done\" && (\n

Time

{score}

\n correct in 30 seconds{score > 0 && `, ${(30 / score).toFixed(1)}s each`}\n

\n {saveError &&

{saveError}

}\n \n Play again\n \n setPhase(\"idle\")}\n className=\"w-full mt-2 text-sm text-gray-500 hover:text-gray-800 py-2\"\n >\n Change name\n \n

\n )}\n\n \n\n

\n View source\n

\n );\n}\n","createdAt",["D",1789515444620],"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 · v15