`, 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",{"_251":252,"_253":254},"routes/_app.x.$handle.$name",{"_105":104,"_37":50,"_113":95,"_32":114,"_13":14,"_115":-5,"_11":116,"_117":118,"_119":120,"_121":122,"_123":124,"_26":-5,"_125":-5,"_126":-5,"_127":30,"_128":129,"_130":64,"_131":-5,"_132":-5,"_133":134},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":18,"_19":-5},"project",{"_48":49,"_37":50,"_43":51,"_52":-5,"_53":30,"_54":55,"_56":55,"_57":58,"_59":-5,"_19":60,"_61":62,"_63":64,"_65":-5,"_66":-5,"_67":68,"_69":70,"_71":72,"_73":74,"_75":76,"_77":-5,"_78":79,"_80":79,"_81":82,"_83":82,"_84":82,"_85":79,"_86":79,"_87":88,"_89":90,"_91":92,"_93":30},"version",2,"changes",[25],"aiChatInfo",{"_20":21,"_22":-5,"_23":-5,"_24":-5},"userId","aiChatMessageId","4044ee9c-7824-446b-b6b7-58b2e1116a6d","aiChatThreadId","aiChatThreadUserId","aiChatThreadTitle",{"_26":27,"_28":-7,"_29":30,"_31":30,"_32":33,"_34":33},"file",{"_35":36,"_37":38,"_39":40,"_41":42,"_43":44,"_45":14,"_46":47,"_29":30},"previous","deleted",false,"deletedHere","path","frontend/theory.ts","latestPath","fileId","e8b2e9fe-9e53-11f1-9c94-1607ee4eb77e","name","theory.ts","fileType","script","content","// Guitar music theory engine: notes, intervals, scales, fretboard data.\n\nexport const SHARPS = [\"C\", \"C#\", \"D\", \"D#\", \"E\", \"F\", \"F#\", \"G\", \"G#\", \"A\", \"A#\", \"B\"];\n\n/** Perfect-sharp note name for a pitch class (0-11). */\nexport function noteName(semitones: number): string {\n return SHARPS[((semitones % 12) + 12) % 12];\n}\n\n/** Interval (scale degree) label for a semitone offset within the octave. */\nexport const INTERVAL_LABEL: Record = {\n 0: { name: \"Root\", short: \"1\" },\n 1: { name: \"Minor 2nd\", short: \"b2\" },\n 2: { name: \"Major 2nd\", short: \"2\" },\n 3: { name: \"Minor 3rd\", short: \"b3\" },\n 4: { name: \"Major 3rd\", short: \"3\" },\n 5: { name: \"Perfect 4th\", short: \"4\" },\n 6: { name: \"Dim. 5th\", short: \"b5\" },\n 7: { name: \"Perfect 5th\", short: \"5\" },\n 8: { name: \"Minor 6th\", short: \"b6\" },\n 9: { name: \"Major 6th\", short: \"6\" },\n 10: { name: \"Minor 7th\", short: \"b7\" },\n 11: { name: \"Major 7th\", short: \"7\" },\n};\n\nexport interface ScaleDef {\n name: string;\n /** Semitone offsets from the root, in order. */\n pattern: number[];\n /** Human description of the sound. */\n vibe: string;\n}\n\nexport const SCALES: ScaleDef[] = [\n { name: \"Major\", pattern: [0, 2, 4, 5, 7, 9, 11], vibe: \"Bright, resolved, happy.\" },\n { name: \"Natural Minor\", pattern: [0, 2, 3, 5, 7, 8, 10], vibe: \"Dark, sad, the relative to major.\" },\n { name: \"Harmonic Minor\", pattern: [0, 2, 3, 5, 7, 8, 11], vibe: \"Exotic, has the leading-tone raised 7th.\" },\n { name: \"Dorian\", pattern: [0, 2, 3, 5, 7, 9, 10], vibe: \"Moody minor with a lifted 6th — funky, bluesy.\" },\n { name: \"Mixolydian\", pattern: [0, 2, 4, 5, 7, 9, 10], vibe: \"Major with a flattened 7th — rock/blues dominant.\" },\n { name: \"Lydian\", pattern: [0, 2, 4, 6, 7, 9, 11], vibe: \"Dreamy major with a raised 4th.\" },\n { name: \"Phrygian\", pattern: [0, 1, 3, 5, 7, 8, 10], vibe: \"Spanish/tense minor with a flat 2nd.\" },\n { name: \"Locrian\", pattern: [0, 1, 3, 5, 6, 8, 10], vibe: \"Diminished, unstable — the spiciest mode.\" },\n { name: \"Major Pentatonic\", pattern: [0, 2, 4, 7, 9], vibe: \"The happy folk/country 5-note scale.\" },\n { name: \"Minor Pentatonic\", pattern: [0, 3, 5, 7, 10], vibe: \"THE rock/blues scale. Freedom.\" },\n { name: \"Blues\", pattern: [0, 3, 5, 6, 7, 10], vibe: \"Minor pentatonic + the 'blue' b5.\" },\n { name: \"Whole Tone\", pattern: [0, 2, 4, 6, 8, 10], vibe: \"Dreamy, unresolved — all whole steps.\" },\n { name: \"Diminished\", pattern: [0, 2, 3, 5, 6, 8, 9, 11], vibe: \"Dense, symmetrical, cinematic tension.\" },\n];\n\n/** Deterministic color per scale degree index. Root is always red. */\nexport function degreeColor(degree: number): string {\n if (degree === 0) return \"hsl(350, 80%, 50%)\"; // root\n const palette = [\n \"hsl(210, 75%, 52%)\",\n \"hsl(170, 65%, 42%)\",\n \"hsl(100, 60%, 42%)\",\n \"hsl(48, 90%, 42%)\",\n \"hsl(30, 85%, 52%)\",\n \"hsl(280, 60%, 55%)\",\n \"hsl(200, 70%, 45%)\",\n ];\n return palette[(degree - 1) % palette.length];\n}\n\n// Standard tuning, low to high: MIDI number of each string's open note.\n// E2=40, A2=45, D3=50, G3=55, B3=59, E4=64\nexport const STRING_OPEN_MIDI = [40, 45, 50, 55, 59, 64];\nexport const FRETS = 15;\n/** Fret positions of the little inlay dots. */\nexport const MARKER_FRETS = [3, 5, 7, 9, 12, 15];\n\nexport interface FretNote {\n midi: number;\n semitone: number; // pitch class 0-11\n // filled in when mapping a scale:\n inScale?: boolean;\n degreeIndex?: number; // index into the scale's notes\n semitoneInScale?: number; // the interval offset above the root\n}\n\n/**\n * Build a 2-D grid of notes: STRING_OPEN_MIDI (low E at top) x FRETS+1 (fret 0..FRETS).\n * Row 0 = lowest string (fret dots inverted like a real neck viewed from the front).\n */\nexport function buildNeck(): FretNote[][] {\n return STRING_OPEN_MIDI.map((openMidi) =>\n Array.from({ length: FRETS + 1 }, (_, fret) => {\n const midi = openMidi + fret;\n return { midi, semitone: midi % 12 };\n })\n );\n}\n\n/** Map a root pitch class + scale pattern across the neck. */\nexport function mapScale(neck: FretNote[][], root: number, pattern: number[]) {\n for (const row of neck) {\n for (const note of row) {\n const off = ((note.semitone - root) % 12 + 12) % 12;\n const degreeIndex = pattern.indexOf(off);\n if (degreeIndex >= 0) {\n note.inScale = true;\n note.degreeIndex = degreeIndex;\n note.semitoneInScale = off;\n } else {\n note.inScale = false;\n note.degreeIndex = undefined;\n }\n }\n }\n}\n","createdAt",["D",1787421864862],"branchVersion","branchId","fe3da5af-30a0-482c-9cfe-bded055894d0","id","6fbe4a5a-23d4-4486-a8d2-b5b17783e6b8","guitar-lab",["D",1787421842194],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Guitar music theory & scales site with a fretboard visualizer","imageUrl","e6d51557-2988-4ce3-bf61-63d827903a6c","pinnedFileId","01a02aa4-dbb8-719f-bc43-19e2bc8208fe","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","3ebf4d50-fe40-465b-915c-bd543c8a8608","tursoName","6fbe4a5a23d44486a8d2b5b17783e6b8","tursoHostname","6fbe4a5a23d44486a8d2b5b17783e6b8-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789521640046],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_105":104,"_112":108},"org",{"_105":104,"_106":-5,"_107":108,"_19":60,"_109":110,"_111":30},"branch",{"_13":94,"_37":95,"_48":47,"_96":49,"_97":-5,"_98":-5,"_99":-5,"_100":-5,"_101":-5,"_102":50,"_103":104},"isOwned",22,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","test_account_001","handle","displayName","avatar","https://img.clerk.com/eyJ0eXBlIjoiZGVmYXVsdCIsImlpZCI6Imluc18yTm10cGhQUklwU0tqZHNiOHNnNGd2ZjJURFUiLCJyaWQiOiJ1c2VyXzJabHpKOGNWSmhqcWduM3VVV0xTUGlicVprayJ9","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_48":49,"_37":50,"_43":246,"_52":-5,"_53":30,"_54":55,"_56":55,"_57":58,"_59":-5,"_19":60,"_61":62,"_63":64,"_65":-5,"_66":-5,"_67":68,"_69":70,"_71":72,"_73":74,"_75":247,"_77":-5,"_78":79,"_80":79,"_81":82,"_83":82,"_84":82,"_85":79,"_86":79,"_87":248,"_89":249,"_91":250,"_93":30},"tree",[177,185,186,187],"files",[177,178,179,180,181,182,183,184,185,186,187],"counts",{"_167":68,"_168":142,"_169":68,"_170":171,"_172":173},"contents",[135,136,137,138],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_48":161,"_37":162,"_35":163,"_141":-5,"_46":47,"_45":142,"_143":64,"_43":164,"_13":68,"_39":165,"_41":-5,"_29":30,"_147":-5,"_32":166},{"_48":155,"_37":156,"_35":157,"_141":-5,"_46":47,"_45":142,"_143":64,"_43":158,"_13":68,"_39":26,"_41":159,"_29":30,"_147":-5,"_32":160},{"_48":149,"_37":150,"_35":151,"_141":-5,"_46":47,"_45":142,"_143":30,"_43":152,"_13":68,"_39":26,"_41":153,"_29":30,"_147":-5,"_32":154},{"_48":139,"_37":140,"_35":62,"_141":-5,"_46":47,"_45":142,"_143":64,"_43":144,"_13":68,"_39":145,"_41":146,"_29":30,"_147":50,"_32":148},"880e574a-09c0-49a4-a75e-cac9fd705d83","index.ts","parentId",1,"latest",["D",1787421842194],"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",[140],"af5436d7-3acb-4151-91de-a4ed568669ab","README.md","01a02aa4-dbb8-719f-bc43-17d83a46fa8b",["D",1787421842194],"# 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],"dbc48714-2533-466b-bc51-6d25e955f35e","CHANGELOG.md","01a02aa4-dbb8-719f-bc43-13e217c72655",["D",1787421842194],"# 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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