`, 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",{"_265":266,"_267":268},"routes/_app.x.$handle.$name",{"_107":106,"_38":52,"_116":97,"_33":111,"_13":14,"_117":-5,"_11":118,"_119":120,"_121":122,"_123":124,"_125":126,"_26":-5,"_127":-5,"_128":-5,"_129":31,"_130":131,"_132":66,"_133":-5,"_134":-5,"_135":136},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":18,"_19":-5},"project",{"_50":51,"_38":52,"_45":53,"_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":78,"_79":-5,"_80":81,"_82":81,"_83":84,"_85":84,"_86":84,"_87":81,"_88":81,"_89":90,"_91":92,"_93":94,"_95":31},"version",35,"changes",[25],"aiChatInfo",{"_20":21,"_22":-5,"_23":-5,"_24":-5},"userId","aiChatMessageId","70c324f7-503e-404e-b220-0b4069d54f1d","aiChatThreadId","aiChatThreadUserId","aiChatThreadTitle",{"_26":27,"_28":29,"_30":31,"_32":31,"_33":34,"_35":34},"file",{"_36":37,"_38":39,"_40":41,"_42":44,"_45":46,"_47":14,"_48":49,"_30":31},"previous",{"_36":37,"_38":39,"_40":41,"_42":43},"deleted",false,"deletedHere","path","lib/stations.ts","latestPath","fileId","33da733a-af92-11f1-bf99-1607ee4eb77e","name","stations.ts","fileType","script","content","// Lista polskich stacji radiowych z bezpośrednimi adresami strumieni.\n// Strumienie (często czysty HTTP) puszczamy przez proxy audio w index.ts\n// (/stream/:id). Logotypy (logo: przezroczysty obraz; null = brak) serwujemy\n// przez /logo/:id. Strumienie nie wychodzą do klienta — są po stronie serwera.\nexport type Station = {\n id: string;\n name: string;\n desc: string; // gatunek / opis\n short: string; // monogram / wordmark (fallback, gdy brak logo)\n accent: string; // kolor akcentu (aplikowany subtelnie, bez kolorowego tła)\n stream: string;\n logo: string | null;\n};\n\nexport const STATIONS: Station[] = [\n { id: \"rmf_fm\", name: \"RMF FM\", desc: \"Pop · hity\", short: \"RMF\", accent: \"#e11d48\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/RMF%20FM%20logotyp%202022.png\", stream: \"http://195.150.20.242:8000/rmf_fm\" },\n { id: \"rmf_maxxx\", name: \"RMF MAXX\", desc: \"Dance · hity\", short: \"MAXX\", accent: \"#f97316\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/RMF%20MAXX.png\", stream: \"http://195.150.20.242:8000/rmf_maxxx\" },\n { id: \"rmf_classic\", name: \"RMF Classic\", desc: \"Muzyka poważna\", short: \"RMF CL\", accent: \"#4f46e5\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/RMF%20CLASSIC%20-%20logotyp.png\", stream: \"http://195.150.20.242:8000/rmf_classic\" },\n { id: \"rmf_chillout\", name: \"RMF Chillout\", desc: \"Relaks · lounge\", short: \"RMF CHILL\", accent: \"#0284c7\", logo: null, stream: \"http://195.150.20.242:8000/rmf_chillout\" },\n { id: \"rmf_2\", name: \"RMF 2\", desc: \"Dance · electro\", short: \"RMF 2\", accent: \"#65a30d\", logo: null, stream: \"http://195.150.20.242:8000/rmf_2\" },\n { id: \"nowy_swiat\", name: \"Radio Nowy Świat\", desc: \"Muzyka i rozmowy\", short: \"RNS\", accent: \"#0e7490\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Radio_Nowy_%C5%9Awiat_logotyp.png\", stream: \"https://stream.rcs.revma.com/ypqt40u0x1zuv\" },\n { id: \"tok_fm\", name: \"TOK FM\", desc: \"Publicystyka · rozmowy\", short: \"TOK\", accent: \"#57534e\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Tok-fm.png\", stream: \"http://poznan5-4.radio.pionier.net.pl:8000/tuba10-1.mp3\" },\n { id: \"pr3\", name: \"PR Trójka\", desc: \"Muzyka · publicystyka\", short: \"TRÓJKA\", accent: \"#0f766e\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Logotyp_programu_trzeciego_Polskiego_Radia.svg\", stream: \"http://stream3.polskieradio.pl:8954\" },\n { id: \"r357\", name: \"Radio 357\", desc: \"Autorskie audycje\", short: \"357\", accent: \"#c026d3\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Radio357.svg\", stream: \"https://stream.rcs.revma.com/ye5kghkgcm0uv\" },\n { id: \"eska\", name: \"Eska\", desc: \"Listy przebojów · hity\", short: \"ESKA\", accent: \"#8b5cf6\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Logo_Radia_Eska.svg\", stream: \"https://ic1.smcdn.pl/2070-1.mp3\" },\n { id: \"eska_2\", name: \"Eska 2\", desc: \"Impreza · electro\", short: \"ESKA2\", accent: \"#d946ef\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Eska%201049%202.png\", stream: \"https://ic1.smcdn.pl/2160-1.mp3\" },\n { id: \"eska_rock\", name: \"Eska Rock\", desc: \"Rock · alternatywa\", short: \"ROCK\", accent: \"#3f3f46\", logo: \"https://www.eskarock.pl/media/eskarock/desktop/images/logo.svg\", stream: \"https://ic1.smcdn.pl/2330-1.mp3\" },\n { id: \"antyradio\", name: \"Antyradio\", desc: \"Rock · metal\", short: \"ANTY\", accent: \"#991b1b\", logo: \"https://pl.wikipedia.org/wiki/Special:FilePath/Antyradio_(logo_2015).svg\", stream: \"https://28503.live.streamtheworld.com/ANTYRADIO.mp3?dist=openfm\" },\n { id: \"radio_lublin\", name: \"Radio Lublin\", desc: \"Regionalne · Lubelszczyzna\", short: \"LBL\", accent: \"#16a34a\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/RadioLublin.png\", stream: \"http://streaming.radio.lublin.pl:8000/128k\" },\n];\n","// Lista polskich stacji radiowych z bezpośrednimi adresami strumieni.\n// Strumienie (często czysty HTTP) puszczamy przez proxy audio w index.ts\n// (/stream/:id). Logotypy (logo: przezroczysty obraz; null = brak) serwujemy\n// przez /logo/:id. Strumienie nie wychodzą do klienta — są po stronie serwera.\nexport type Station = {\n id: string;\n name: string;\n desc: string; // gatunek / opis\n short: string; // monogram / wordmark (fallback, gdy brak logo)\n accent: string; // kolor akcentu (aplikowany subtelnie, bez kolorowego tła)\n stream: string;\n logo: string | null;\n};\n\nexport const STATIONS: Station[] = [\n { id: \"rmf_fm\", name: \"RMF FM\", desc: \"Pop · hity\", short: \"RMF\", accent: \"#e11d48\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/RMF%20FM%20logotyp%202022.png\", stream: \"http://195.150.20.242:8000/rmf_fm\" },\n { id: \"rmf_maxxx\", name: \"RMF MAXX\", desc: \"Dance · hity\", short: \"MAXX\", accent: \"#f97316\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/RMF%20MAXX.png\", stream: \"http://195.150.20.242:8000/rmf_maxxx\" },\n { id: \"rmf_classic\", name: \"RMF Classic\", desc: \"Muzyka poważna\", short: \"RMF CL\", accent: \"#4f46e5\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/RMF%20CLASSIC%20-%20logotyp.png\", stream: \"http://195.150.20.242:8000/rmf_classic\" },\n { id: \"rmf_chillout\", name: \"RMF Chillout\", desc: \"Relaks · lounge\", short: \"RMF CHILL\", accent: \"#0284c7\", logo: null, stream: \"http://195.150.20.242:8000/rmf_chillout\" },\n { id: \"rmf_2\", name: \"RMF 2\", desc: \"Dance · electro\", short: \"RMF 2\", accent: \"#65a30d\", logo: null, stream: \"http://195.150.20.242:8000/rmf_2\" },\n { id: \"nowy_swiat\", name: \"Radio Nowy Świat\", desc: \"Muzyka i rozmowy\", short: \"RNS\", accent: \"#0e7490\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Radio_Nowy_%C5%9Awiat_logotyp.png\", stream: \"https://stream.rcs.revma.com/ypqt40u0x1zuv\" },\n { id: \"tok_fm\", name: \"TOK FM\", desc: \"Publicystyka · rozmowy\", short: \"TOK\", accent: \"#57534e\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Tok-fm.png\", stream: \"http://poznan5-4.radio.pionier.net.pl:8000/tuba10-1.mp3\" },\n { id: \"pr3\", name: \"PR Trójka\", desc: \"Muzyka · publicystyka\", short: \"TRÓJKA\", accent: \"#0f766e\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Logotyp_programu_trzeciego_Polskiego_Radia.svg\", stream: \"http://stream3.polskieradio.pl:8954\" },\n { id: \"r357\", name: \"Radio 357\", desc: \"Autorskie audycje\", short: \"357\", accent: \"#c026d3\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Radio357.svg\", stream: \"https://stream.rcs.revma.com/ye5kghkgcm0uv\" },\n { id: \"eska\", name: \"Eska\", desc: \"Listy przebojów · hity\", short: \"ESKA\", accent: \"#8b5cf6\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Logo_Radia_Eska.svg\", stream: \"https://ic1.smcdn.pl/2070-1.mp3\" },\n { id: \"eska_2\", name: \"Eska 2\", desc: \"Impreza · electro\", short: \"ESKA2\", accent: \"#d946ef\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/Eska%201049%202.png\", stream: \"https://ic1.smcdn.pl/2160-1.mp3\" },\n { id: \"eska_rock\", name: \"Eska Rock\", desc: \"Rock · alternatywa\", short: \"ROCK\", accent: \"#3f3f46\", logo: \"https://www.eskarock.pl/media/eskarock/desktop/images/logo.svg\", stream: \"https://ic1.smcdn.pl/2330-1.mp3\" },\n { id: \"antyradio\", name: \"Antyradio\", desc: \"Rock · metal\", short: \"ANTY\", accent: \"#991b1b\", logo: null, stream: \"https://28503.live.streamtheworld.com/ANTYRADIO.mp3?dist=openfm\" },\n { id: \"radio_lublin\", name: \"Radio Lublin\", desc: \"Regionalne · Lubelszczyzna\", short: \"LBL\", accent: \"#16a34a\", logo: \"https://commons.wikimedia.org/wiki/Special:FilePath/RadioLublin.png\", stream: \"http://streaming.radio.lublin.pl:8000/128k\" },\n];\n","createdAt",["D",1789320561034],"branchVersion","branchId","26a9cea8-03a5-4dee-ab96-5b9583a81dac","id","e3e11001-2912-48b9-ac7c-6832ffa544ef","radio-app",["D",1789317738487],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Minimalny mobilny odtwarzacz polskich stacji radiowych","imageUrl","5dd5cdfa-b36a-42e1-a911-81ba86e3b64c","pinnedFileId","01a09ba5-f0b0-766b-99ae-1c7a57d8f892","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","01a09aab-d118-725d-b44f-c12d328bfdc6","tursoName","e3e11001291248b9ac7c6832ffa544ef","tursoHostname","e3e11001291248b9ac7c6832ffa544ef-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789492268774],"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",89,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","dominik1","handle","displayName","Dominik","avatar","","tier","free","canRestrictVals","profileImageUrl","branchName","adoptOrgId",{"_50":51,"_38":52,"_45":260,"_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":261,"_79":-5,"_80":81,"_82":81,"_83":84,"_85":84,"_86":84,"_87":81,"_88":81,"_89":262,"_91":263,"_93":264,"_95":31},"tree",[191,197,199,200,201],"files",[191,192,193,194,195,196,197,198,199,200,201],"counts",{"_181":70,"_182":165,"_183":70,"_184":185,"_186":187},"contents",[137,138,139,140,141],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_50":176,"_38":177,"_36":178,"_144":-5,"_48":49,"_47":165,"_146":66,"_45":179,"_13":70,"_40":174,"_42":-5,"_30":31,"_151":-5,"_33":180},{"_50":169,"_38":170,"_36":171,"_144":-5,"_48":49,"_47":172,"_146":66,"_45":173,"_13":70,"_40":174,"_42":-5,"_30":31,"_151":-5,"_33":175},{"_50":162,"_38":163,"_36":164,"_144":-5,"_48":49,"_47":165,"_146":66,"_45":166,"_13":70,"_40":26,"_42":167,"_30":31,"_151":-5,"_33":168},{"_50":154,"_38":155,"_36":156,"_144":-5,"_48":49,"_47":157,"_146":31,"_45":158,"_13":159,"_40":26,"_42":160,"_30":31,"_151":-5,"_33":161},{"_50":142,"_38":143,"_36":64,"_144":-5,"_48":49,"_47":145,"_146":31,"_45":147,"_13":148,"_40":149,"_42":150,"_30":31,"_151":152,"_33":153},"0773830d-ec4e-406b-9f2a-1cf1b2ba6cbc","index.ts","parentId",22,"latest",["D",1789318630107],5,"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 { STATIONS } from \"./lib/stations.ts\";\n\nconst app = new Hono();\n\n// Spis stacji — frontend pobiera z /api/stations (bez adresów strumieni, te\n// idą wyłącznie przez proxy, żeby nie puszczać WAN-owych http wprost do klienta)\napp.get(\"/api/stations\", (c) =>\n c.json(STATIONS.map(({ id, name, desc, short, accent, logo }) => ({ id, name, desc, short, accent, logo })))\n);\n\n// Proxy logotypów: /logo/:id pobiera obraz ze źródła (logo) i oddaje go po\n// https. Jeśli źródła nie ma albo nie jest obrazem → 404 (UI wtedy pokazuje\n// monogram jako fallback).\napp.get(\"/logo/:id\", async (c) => {\n const id = c.req.param(\"id\");\n const station = STATIONS.find((s) => s.id === id);\n if (!station?.logo) return c.json({ error: \"Brak logo.\" }, 404);\n\n try {\n const up = await fetch(station.logo, {\n headers: { \"User-Agent\": \"Mozilla/5.0 (compatible; ValTownRadio/1.0)\" },\n });\n const ct = up.headers.get(\"content-type\") ?? \"\";\n if (!up.ok || !ct.startsWith(\"image/\")) return c.json({ error: \"Brak logo.\" }, 404);\n return new Response(up.body, {\n status: 200,\n headers: {\n \"Content-Type\": ct,\n \"Cache-Control\": \"public, max-age=86400\",\n },\n });\n } catch {\n return c.json({ error: \"Brak logo.\" }, 404);\n }\n});\n\n// Proxy audio: przeglądarka trafia na HTTPS /stream/:id, a my pobieramy\n// upstream (często czysty HTTP) i przesyłamy jego strumień dalej. Dzięki temu\n// nie ma blokady \"mixed content\", a adresy światowych serwerów są ukryte.\napp.get(\"/stream/:id\", async (c) => {\n const id = c.req.param(\"id\");\n const station = STATIONS.find((s) => s.id === id);\n if (!station) return c.json({ error: \"Nieznana stacja.\" }, 404);\n\n try {\n // User-Agent klienta audio (VLC), nie przeglądarki — niektóre serwery\n // SHOUTcast (np. Polskie Radio) oddają HTML stronie statusu przeglądarce,\n // a strumień audio — wyłącznie \"odtwarzaczom\".\n const upstream = await fetch(station.stream, {\n headers: {\n \"User-Agent\": \"VLC/3.0.18 LibVLC/3.0.18\",\n },\n });\n if (!upstream.ok || !upstream.body) {\n return c.json({ error: `Stacja chwilowo niedostępna (${upstream.status}).` }, 502);\n }\n // Przekazujemy strumień audio jako body odpowiedzi\n return new Response(upstream.body, {\n status: upstream.status,\n headers: {\n \"Content-Type\": upstream.headers.get(\"content-type\") ?? \"audio/mpeg\",\n \"Cache-Control\": \"no-cache\",\n \"X-Accel-Buffering\": \"no\",\n },\n });\n } catch {\n return c.json({ error: \"Nie udało się połączyć ze stacją.\" }, 502);\n }\n});\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// Unwrap and rethrow Hono errors as the original error\napp.onError((err) => Promise.reject(err));\n\n// HTTP vals expect an exported \"fetch handler\"\nexport default app.fetch;\n","label","radio-pl",[143],"ee731ddf-b816-4838-8846-afc7218d50e2","README.md","01a09ba5-f0b0-766b-99ae-1becdd352fcb",20,["D",1789318511030],3,"# 📻 Radio PL\n\nMinimalny, mobile-first odtwarzacz polskich stacji radiowych. Klikasz stację — i gra.\nJasna, „redakcyjna” szata (bez kiczu). Zbudowany na Val Town (React + Hono).\n\n## Otwórz: \n\n## Stacje\n\n| Stacja | Format | Status |\n| --- | --- | --- |\n| RMF FM, RMF MAXX, RMF Classic, RMF Chillout, RMF 2 | MP3 | ✅ grają |\n| Radio Nowy Świat | MP3 | ✅ gra |\n| TOK FM | MP3 | ✅ gra |\n| **Radio 357** | AAC | ✅ gra |\n| PR Trójka | AAC (SHOUTcast) | ⚠️ upstream bywa nieosiągalny |\n\n## Jak to działa\n\n```mermaid\ngraph LR\n Browser[Przeglądarka] -->|klik| UI[\"React · frontend/components\"]\n UI -->|GET /api/stations| API[\"Hono · index.ts\"]\n UI -->|audio src /stream/:id| Proxy[\"Proxy audio HTTPS\"]\n Proxy -->|pobiera i przesyła| Upstream[\"Strumień stacji (HTTP)\"]\n```\n\n- **Proxy audio** `/stream/:id` — pobiera upstream (często czysty `http://`) i\n przesyła go po `https://`, więc przeglądarka nie blokuje go jako „mixed content”.\n- **User-Agent** proxy = klient audio (VLC), nie przeglądarka — serwery SHOUTcast\n (jak Polskie Radio) inaczej oddają HTML strony statusu zamiast strumienia.\n- **Lista stacji** — `lib/stations.ts` (zweryfikowana; adresy strumieni nie\n wychodzą do klienta — są tylko po stronie serwera).\n\n## Pliki\n\n```\nindex.ts ← Hono: /api/stations + proxy audio /stream/:id\nlib/stations.ts ← stacje (nazwa, monogram, kolor akcentu, strumień)\nfrontend/\n root.tsx ← HTML shell (jasny motyw, Google Fonts)\n index.tsx ← entrypoint React\n components/App.tsx ← lista stacji + przyklejona belka odtwarzacza\n```\n\nRemix szablonu [`react-hono-starter`](https://www.val.town/x/templates/react-hono-starter).\n",[155],"b0a8eb41-6bfe-4c12-ab32-41c3780b4f4d","CHANGELOG.md","01a09ba5-f0b0-766b-99ae-14a493a1cbdf",1,["D",1789317738487],"# 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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