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React + Hono Starter

\n \n

\n View source\n

\n );\n}\n","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useEffect, useRef, useState } from \"https://esm.sh/react@18.2.0\";\n\nconst CELL = 20; // pixels per grid cell\nconst COLS = 20;\nconst ROWS = 20;\n\ntype Point = { x: number; y: number };\ntype Direction = \"up\" | \"down\" | \"left\" | \"right\";\n\nconst OPPOSITE: Record = {\n up: \"down\",\n down: \"up\",\n left: \"right\",\n right: \"left\",\n};\n\nfunction randomFood(snake: Point[]): Point {\n while (true) {\n const p = {\n x: Math.floor(Math.random() * COLS),\n y: Math.floor(Math.random() * ROWS),\n };\n if (!snake.some((s) => s.x === p.x && s.y === p.y)) return p;\n }\n}\n\nexport function App() {\n const canvasRef = useRef(null);\n const [score, setScore] = useState(0);\n const [best, setBest] = useState(0);\n const [gameOver, setGameOver] = useState(false);\n const [started, setStarted] = useState(false);\n const [speed, setSpeed] = useState(140);\n\n // Game state lives in refs so the interval can read/write without re-rendering.\n const snakeRef = useRef([]);\n const dirRef = useRef(\"right\");\n const foodRef = useRef({ x: 5, y: 5 });\n const deadRef = useRef(false);\n\n function reset() {\n snakeRef.current = [\n { x: 7, y: 10 },\n { x: 6, y: 10 },\n { x: 5, y: 10 },\n ];\n dirRef.current = \"right\";\n foodRef.current = randomFood(snakeRef.current);\n deadRef.current = false;\n setScore(0);\n setGameOver(false);\n setStarted(true);\n }\n\n // Draw the game to the canvas.\n function draw() {\n const canvas = canvasRef.current;\n if (!canvas) return;\n const ctx = canvas.getContext(\"2d\")!;\n\n // background\n ctx.fillStyle = \"#0f172a\";\n ctx.fillRect(0, 0, COLS * CELL, ROWS * CELL);\n\n // subtle grid\n ctx.strokeStyle = \"#1e293b\";\n ctx.lineWidth = 1;\n for (let i = 0; i <= COLS; i++) {\n ctx.beginPath();\n ctx.moveTo(i * CELL, 0);\n ctx.lineTo(i * CELL, ROWS * CELL);\n ctx.stroke();\n }\n for (let j = 0; j <= ROWS; j++) {\n ctx.beginPath();\n ctx.moveTo(0, j * CELL);\n ctx.lineTo(COLS * CELL, j * CELL);\n ctx.stroke();\n }\n\n // food\n ctx.fillStyle = \"#ef4444\";\n ctx.beginPath();\n ctx.arc(\n foodRef.current.x * CELL + CELL / 2,\n foodRef.current.y * CELL + CELL / 2,\n CELL / 2 - 2,\n 0,\n Math.PI * 2,\n );\n ctx.fill();\n\n // snake\n snakeRef.current.forEach((seg, i) => {\n ctx.fillStyle = i === 0 ? \"#22c55e\" : \"#15803d\";\n ctx.fillRect(seg.x * CELL + 1, seg.y * CELL + 1, CELL - 2, CELL - 2);\n // eyes on the head\n if (i === 0) {\n ctx.fillStyle = \"#06281a\";\n ctx.fillRect(seg.x * CELL + CELL / 2 - 4, seg.y * CELL + 3, 3, 3);\n ctx.fillRect(seg.x * CELL + CELL / 2 + 1, seg.y * CELL + 3, 3, 3);\n }\n });\n }\n\n // One step of the game loop.\n function step() {\n const snake = snakeRef.current;\n const dir = dirRef.current;\n const head = snake[0];\n const next: Point = {\n x: head.x + (dir === \"right\" ? 1 : dir === \"left\" ? -1 : 0),\n y: head.y + (dir === \"down\" ? 1 : dir === \"up\" ? -1 : 0),\n };\n\n // wall collision\n if (next.x < 0 || next.y < 0 || next.x >= COLS || next.y >= ROWS) {\n die();\n return;\n }\n // self collision (allow the tail to move away)\n if (snake.some((s, i) => i !== snake.length - 1 && s.x === next.x && s.y === next.y)) {\n die();\n return;\n }\n\n snake.unshift(next);\n\n if (next.x === foodRef.current.x && next.y === foodRef.current.y) {\n setScore((s) => s + 1);\n foodRef.current = randomFood(snake);\n } else {\n snake.pop();\n }\n }\n\n function die() {\n deadRef.current = true;\n setGameOver(true);\n setStarted(false);\n setBest((b) => {\n const s = score;\n return s > b ? s : b;\n });\n }\n\n // Key handling.\n useEffect(() => {\n function onKey(e: KeyboardEvent) {\n const map: Record = {\n ArrowUp: \"up\",\n ArrowDown: \"down\",\n ArrowLeft: \"left\",\n ArrowRight: \"right\",\n w: \"up\",\n s: \"down\",\n a: \"left\",\n d: \"right\",\n };\n const dir = map[e.key.toLowerCase?.() ?? \"\"] ?? map[e.key];\n if (!dir) return;\n e.preventDefault();\n if (dir === OPPOSITE[dirRef.current] && snakeRef.current.length > 1) return;\n // space to start/restart\n if (e.key === \" \" || e.key === \"Spacebar\") {\n if (!started && !gameOver) return;\n }\n if (dirRef.current === dir) return;\n dirRef.current = dir;\n }\n window.addEventListener(\"keydown\", onKey);\n return () => window.removeEventListener(\"keydown\", onKey);\n }, [started, gameOver]);\n\n // Start / restart from the game over screen.\n useEffect(() => {\n function onKey(e: KeyboardEvent) {\n if ((e.key === \" \" || e.key === \"Enter\") && !started) {\n e.preventDefault();\n reset();\n }\n }\n window.addEventListener(\"keydown\", onKey);\n return () => window.removeEventListener(\"keydown\", onKey);\n }, [started]);\n\n // Game loop.\n useEffect(() => {\n draw();\n if (!started) return;\n const id = setInterval(() => {\n if (deadRef.current) {\n clearInterval(id);\n return;\n }\n step();\n draw();\n }, speed);\n return () => clearInterval(id);\n }, [started, speed]);\n\n // Announce game over on screen.\n useEffect(() => {\n if (gameOver) draw();\n }, [gameOver]);\n\n function changeSpeed(e: React.ChangeEvent) {\n const v = Number(e.target.value);\n setSpeed(v);\n }\n\n return (\n

🐍 Snake

Use arrow keys / WASD. Eat the red dots, don't hit walls or yourself.

\n\n

\n \n Score: {score}\n \n \n Best: {best}\n \n \n Speed\n \n \n

\n\n

\n \n\n {(!started || gameOver) && (\n

\n {gameOver ? Game Over : Ready?}\n

\n {gameOver &&

Final score: {score}

}\n \n {gameOver ? \"Play Again\" : \"Start Game\"}\n \n

or press Space / Enter

\n )}\n

\n\n

\n View source\n

\n );\n}\n","createdAt",["D",1789478628182],"branchVersion","branchId","ac2ee891-5cfd-4044-ab26-c6a03b116ff2","id","8d316882-cbc7-4dd2-a1e3-6c0aae9c1e8e","nebula-game",["D",1789478586214],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","JJK turn-based RPG fighting game, playable in browser","imageUrl","d6d32317-8e12-4003-b452-8bd4229aeca3","pinnedFileId","01a0a53c-47b2-77dd-bce2-442aef00ca2f","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","01a0a0c6-84d9-72a5-9904-46bf8e8a5e5f","tursoName","8d316882cbc74dd2a1e36c0aae9c1e8e","tursoHostname","8d316882cbc74dd2a1e36c0aae9c1e8e-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789479081816],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_107":106,"_115":111},"org",{"_107":106,"_108":109,"_110":111,"_19":62,"_112":113,"_114":31},"branch",{"_13":96,"_38":97,"_50":49,"_98":51,"_99":-5,"_100":-5,"_101":-5,"_102":-5,"_103":-5,"_104":52,"_105":106},"isOwned",22,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","IceyDomain","handle","displayName","Nathaniel Barrett","avatar","https://avatars.githubusercontent.com/u/174974902?v=4","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_50":51,"_38":52,"_45":242,"_54":-5,"_55":31,"_56":57,"_58":57,"_59":60,"_61":-5,"_19":62,"_63":64,"_65":66,"_67":-5,"_68":-5,"_69":70,"_71":72,"_73":74,"_75":76,"_77":243,"_79":-5,"_80":81,"_82":81,"_83":84,"_85":84,"_86":84,"_87":81,"_88":81,"_89":244,"_91":245,"_93":246,"_95":31},"tree",[181,188,189,190],"files",[181,182,183,184,185,186,187,188,189,190],"counts",{"_171":70,"_172":145,"_173":70,"_174":175,"_176":177},"contents",[138,139,140,141],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_50":165,"_38":166,"_36":167,"_144":-5,"_48":49,"_47":145,"_146":66,"_45":168,"_13":70,"_40":169,"_42":-5,"_30":31,"_150":-5,"_33":170},{"_50":159,"_38":160,"_36":161,"_144":-5,"_48":49,"_47":145,"_146":66,"_45":162,"_13":70,"_40":26,"_42":163,"_30":31,"_150":-5,"_33":164},{"_50":153,"_38":154,"_36":155,"_144":-5,"_48":49,"_47":145,"_146":31,"_45":156,"_13":70,"_40":26,"_42":157,"_30":31,"_150":-5,"_33":158},{"_50":142,"_38":143,"_36":64,"_144":-5,"_48":49,"_47":145,"_146":66,"_45":147,"_13":70,"_40":148,"_42":149,"_30":31,"_150":151,"_33":152},"da58790c-a508-4379-8ca8-844c5fc1e6a9","index.ts","parentId",1,"latest",["D",1789478586214],"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","nebula-snake",[143],"587a5048-4264-4600-8861-655d71bb4624","README.md","01a0a53c-47b2-77dd-bce2-439ff7a0e667",["D",1789478586214],"# 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",[154],"83e0cc94-a059-4ba9-9562-b0a0e332e0b4","CHANGELOG.md","01a0a53c-47b2-77dd-bce2-3d0b98040573",["D",1789478586214],"# 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 · v2