`, 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",{"_337":338,"_339":340},"routes/_app.x.$handle.$name",{"_99":98,"_32":45,"_107":89,"_27":108,"_13":14,"_109":-5,"_11":110,"_111":112,"_113":114,"_115":116,"_117":118,"_20":-5,"_119":-5,"_120":-5,"_121":25,"_122":123,"_124":58,"_125":-5,"_126":-5,"_127":128},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":-5,"_18":-5},"project",{"_43":44,"_32":45,"_38":46,"_47":-5,"_48":25,"_49":50,"_51":50,"_52":53,"_54":-5,"_18":55,"_56":31,"_57":58,"_59":-5,"_60":-5,"_61":62,"_63":64,"_65":66,"_67":68,"_69":70,"_71":-5,"_72":73,"_74":73,"_75":76,"_77":76,"_78":76,"_79":73,"_80":73,"_81":82,"_83":84,"_85":86,"_87":25},"version",49,"changes",[19],"aiChatInfo","userId",{"_20":21,"_22":23,"_24":25,"_26":25,"_27":28,"_29":28},"file",{"_30":31,"_32":28,"_33":34,"_35":37,"_38":39,"_40":14,"_41":42,"_24":25},"previous",{"_30":31,"_32":28,"_33":34,"_35":36},"deleted",false,"deletedHere","path","index.ts","latestPath","fileId","01a0284c-1b46-711a-b263-211c80180a34","name","fileType","http","content","import { parseVal, serveFile, serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { Root } from \"./frontend/root.tsx\";\nimport { isAuthed, isConfigured, loginCookie, logoutCookie } from \"./backend/auth.ts\";\nimport { archiveAgent, cancelRun, getRun, listAgents, listModels, recover, startChat } from \"./backend/cursor.ts\";\nimport { addMessage, deleteChat, initDb, listLocalChats, listMessages, upsertChat } from \"./backend/db.ts\";\nimport { renderIconPng } from \"./backend/icon.ts\";\n\nconst app = new Hono();\nconst iconCache = new Map();\n\nasync function iconPng(size: number) {\n let png = iconCache.get(size);\n if (!png) {\n png = await renderIconPng(size);\n iconCache.set(size, png);\n }\n return new Response(png, {\n headers: {\n \"Content-Type\": \"image/png\",\n \"Cache-Control\": \"public, max-age=86400\",\n },\n });\n}\n\napp.get(\"/\", (c) => c.html(Root()));\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\napp.get(\"/apple-touch-icon.png\", () => iconPng(180));\napp.get(\"/icon-512.png\", () => iconPng(512));\napp.get(\"/manifest.webmanifest\", async () => {\n const res = await serveFile(\"/frontend/manifest.webmanifest\");\n return new Response(res.body, {\n headers: {\n \"Content-Type\": \"application/manifest+json\",\n \"Cache-Control\": \"no-cache\",\n },\n });\n});\napp.get(\"/sw.js\", async () => {\n const res = await serveFile(\"/frontend/sw.js\");\n return new Response(res.body, {\n headers: {\n \"Content-Type\": \"text/javascript; charset=utf-8\",\n \"Cache-Control\": \"no-cache\",\n \"Service-Worker-Allowed\": \"/\",\n },\n });\n});\n\nasync function requireUser(c: { req: { raw: Request } }) {\n if (!isConfigured()) return { error: \"先配置 CURSOR_API_KEY 和 APP_PASSWORD\", status: 503 as const };\n if (!await isAuthed(c.req.raw)) return { error: \"未登录\", status: 401 as const };\n return null;\n}\n\napp.get(\"/api/status\", async (c) => {\n return c.json({\n configured: isConfigured(),\n authed: await isAuthed(c.req.raw),\n });\n});\n\napp.post(\"/api/login\", async (c) => {\n const body = await c.req.json().catch(() => ({}));\n const cookie = await loginCookie(String(body.password ?? \"\"));\n if (!cookie) return c.json({ error: \"密码错误或未配置 APP_PASSWORD\" }, 401);\n c.header(\"Set-Cookie\", cookie);\n return c.json({ ok: true });\n});\n\napp.post(\"/api/logout\", (c) => {\n c.header(\"Set-Cookie\", logoutCookie());\n return c.json({ ok: true });\n});\n\napp.get(\"/api/models\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n try {\n return c.json({ items: await listModels() });\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.get(\"/api/chats\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n try {\n await initDb();\n const [remote, local] = await Promise.all([listAgents(), listLocalChats()]);\n const localMap = new Map(local.map((row) => [row.agent_id, row]));\n const items = remote.map((agent) => {\n const row = localMap.get(agent.id);\n return {\n id: agent.id,\n title: row?.title || agent.name || \"未命名对话\",\n status: agent.status,\n updatedAt: row?.updated_at || agent.updatedAt || agent.createdAt,\n model: row?.model,\n mode: row?.mode || \"agent\",\n url: agent.url,\n };\n });\n return c.json({ items });\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.get(\"/api/chats/:agentId/messages\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n try {\n const items = await listMessages(c.req.param(\"agentId\"));\n return c.json({ items });\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.delete(\"/api/chats/:agentId\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n const agentId = c.req.param(\"agentId\");\n try {\n await archiveAgent(agentId).catch(() => undefined);\n await deleteChat(agentId);\n return c.json({ ok: true });\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.post(\"/api/messages\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n const body = await c.req.json().catch(() => ({}));\n const agentId = String(body.agentId ?? \"\");\n const role = String(body.role ?? \"\");\n const text = String(body.text ?? \"\");\n if (!agentId || !role || !text) return c.json({ error: \"missing fields\" }, 400);\n await addMessage(agentId, role, text);\n if (body.model) await upsertChat(agentId, undefined, String(body.model));\n return c.json({ ok: true });\n});\n\napp.post(\"/api/chat\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n const body = await c.req.json().catch(() => ({}));\n const text = String(body.text ?? \"\").trim();\n if (!text) return c.json({ error: \"请输入内容\" }, 400);\n const agentId = body.agentId ? String(body.agentId) : undefined;\n const modelId = body.modelId ? String(body.modelId) : undefined;\n const mode = body.mode === \"plan\" ? \"plan\" as const : \"agent\" as const;\n try {\n const started = await startChat(text, agentId, modelId, mode);\n if (started.agentId) {\n await addMessage(started.agentId, \"user\", text);\n await upsertChat(started.agentId, text.slice(0, 48), modelId, mode);\n }\n return c.json(started);\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.get(\"/api/recover\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n const stamp = c.req.query(\"stamp\") ?? \"\";\n const agentId = c.req.query(\"agentId\") || undefined;\n if (!stamp && !agentId) return c.json({ error: \"missing stamp\" }, 400);\n try {\n return c.json(await recover(stamp, agentId));\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.get(\"/api/run/:agentId/:runId\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n try {\n const run = await getRun(c.req.param(\"agentId\"), c.req.param(\"runId\"));\n return c.json(run);\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.post(\"/api/run/:agentId/:runId/cancel\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n try {\n await cancelRun(c.req.param(\"agentId\"), c.req.param(\"runId\"));\n return c.json({ ok: true });\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.onError((err) => Promise.reject(err));\nexport default app.fetch;\n","import { parseVal, serveFile, serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { Root } from \"./frontend/root.tsx\";\nimport { isAuthed, isConfigured, loginCookie, logoutCookie } from \"./backend/auth.ts\";\nimport { archiveAgent, cancelRun, getRun, listAgents, listModels, recover, startChat } from \"./backend/cursor.ts\";\nimport { addMessage, deleteChat, initDb, listLocalChats, listMessages, upsertChat } from \"./backend/db.ts\";\nimport { renderIconPng } from \"./backend/icon.ts\";\n\nconst app = new Hono();\nconst iconCache = new Map();\n\nasync function iconPng(size: number) {\n let png = iconCache.get(size);\n if (!png) {\n png = renderIconPng(size);\n iconCache.set(size, png);\n }\n return new Response(png, {\n headers: {\n \"Content-Type\": \"image/png\",\n \"Cache-Control\": \"public, max-age=86400\",\n },\n });\n}\n\napp.get(\"/\", (c) => c.html(Root()));\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\napp.get(\"/apple-touch-icon.png\", () => iconPng(180));\napp.get(\"/icon-512.png\", () => iconPng(512));\napp.get(\"/manifest.webmanifest\", async () => {\n const res = await serveFile(\"/frontend/manifest.webmanifest\");\n return new Response(res.body, {\n headers: {\n \"Content-Type\": \"application/manifest+json\",\n \"Cache-Control\": \"no-cache\",\n },\n });\n});\napp.get(\"/sw.js\", async () => {\n const res = await serveFile(\"/frontend/sw.js\");\n return new Response(res.body, {\n headers: {\n \"Content-Type\": \"text/javascript; charset=utf-8\",\n \"Cache-Control\": \"no-cache\",\n \"Service-Worker-Allowed\": \"/\",\n },\n });\n});\n\nasync function requireUser(c: { req: { raw: Request } }) {\n if (!isConfigured()) return { error: \"先配置 CURSOR_API_KEY 和 APP_PASSWORD\", status: 503 as const };\n if (!await isAuthed(c.req.raw)) return { error: \"未登录\", status: 401 as const };\n return null;\n}\n\napp.get(\"/api/status\", async (c) => {\n return c.json({\n configured: isConfigured(),\n authed: await isAuthed(c.req.raw),\n });\n});\n\napp.post(\"/api/login\", async (c) => {\n const body = await c.req.json().catch(() => ({}));\n const cookie = await loginCookie(String(body.password ?? \"\"));\n if (!cookie) return c.json({ error: \"密码错误或未配置 APP_PASSWORD\" }, 401);\n c.header(\"Set-Cookie\", cookie);\n return c.json({ ok: true });\n});\n\napp.post(\"/api/logout\", (c) => {\n c.header(\"Set-Cookie\", logoutCookie());\n return c.json({ ok: true });\n});\n\napp.get(\"/api/models\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n try {\n return c.json({ items: await listModels() });\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.get(\"/api/chats\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n try {\n await initDb();\n const [remote, local] = await Promise.all([listAgents(), listLocalChats()]);\n const localMap = new Map(local.map((row) => [row.agent_id, row]));\n const items = remote.map((agent) => {\n const row = localMap.get(agent.id);\n return {\n id: agent.id,\n title: row?.title || agent.name || \"未命名对话\",\n status: agent.status,\n updatedAt: row?.updated_at || agent.updatedAt || agent.createdAt,\n model: row?.model,\n mode: row?.mode || \"agent\",\n url: agent.url,\n };\n });\n return c.json({ items });\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.get(\"/api/chats/:agentId/messages\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n try {\n const items = await listMessages(c.req.param(\"agentId\"));\n return c.json({ items });\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.delete(\"/api/chats/:agentId\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n const agentId = c.req.param(\"agentId\");\n try {\n await archiveAgent(agentId).catch(() => undefined);\n await deleteChat(agentId);\n return c.json({ ok: true });\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.post(\"/api/messages\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n const body = await c.req.json().catch(() => ({}));\n const agentId = String(body.agentId ?? \"\");\n const role = String(body.role ?? \"\");\n const text = String(body.text ?? \"\");\n if (!agentId || !role || !text) return c.json({ error: \"missing fields\" }, 400);\n await addMessage(agentId, role, text);\n if (body.model) await upsertChat(agentId, undefined, String(body.model));\n return c.json({ ok: true });\n});\n\napp.post(\"/api/chat\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n const body = await c.req.json().catch(() => ({}));\n const text = String(body.text ?? \"\").trim();\n if (!text) return c.json({ error: \"请输入内容\" }, 400);\n const agentId = body.agentId ? String(body.agentId) : undefined;\n const modelId = body.modelId ? String(body.modelId) : undefined;\n const mode = body.mode === \"plan\" ? \"plan\" as const : \"agent\" as const;\n try {\n const started = await startChat(text, agentId, modelId, mode);\n if (started.agentId) {\n await addMessage(started.agentId, \"user\", text);\n await upsertChat(started.agentId, text.slice(0, 48), modelId, mode);\n }\n return c.json(started);\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.get(\"/api/recover\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n const stamp = c.req.query(\"stamp\") ?? \"\";\n const agentId = c.req.query(\"agentId\") || undefined;\n if (!stamp && !agentId) return c.json({ error: \"missing stamp\" }, 400);\n try {\n return c.json(await recover(stamp, agentId));\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.get(\"/api/run/:agentId/:runId\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n try {\n const run = await getRun(c.req.param(\"agentId\"), c.req.param(\"runId\"));\n return c.json(run);\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.post(\"/api/run/:agentId/:runId/cancel\", async (c) => {\n const denied = await requireUser(c);\n if (denied) return c.json({ error: denied.error }, denied.status);\n try {\n await cancelRun(c.req.param(\"agentId\"), c.req.param(\"runId\"));\n return c.json({ ok: true });\n } catch (err) {\n return c.json({ error: err instanceof Error ? err.message : String(err) }, 502);\n }\n});\n\napp.onError((err) => Promise.reject(err));\nexport default app.fetch;\n","createdAt",["D",1787385012320],"branchVersion","branchId","6924747a-bd7f-44f6-8ed7-64b4b4bc8bc0","id","97ce4900-8329-43bb-b758-880f88637a91","cursor-chat",["D",1787382471418],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Mobile chat relay to Cursor + Val Town","imageUrl","96c2793d-57c8-41d2-a49a-d1ee82f9dd24","pinnedFileId","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",0,"orgId","93515af8-c7b7-459c-9bf2-3bb3df310a75","tursoName","97ce4900832943bbb758880f88637a91","tursoHostname","97ce4900832943bbb758880f88637a91-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789561879908],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_99":98,"_106":102},"org",{"_99":98,"_100":-5,"_101":102,"_18":55,"_103":104,"_105":25},"branch",{"_13":88,"_32":89,"_43":42,"_90":44,"_91":-5,"_92":-5,"_93":-5,"_94":-5,"_95":-5,"_96":45,"_97":98},"isOwned",376,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","yuxiaoy","handle","displayName","avatar","https://img.clerk.com/eyJ0eXBlIjoiZGVmYXVsdCIsImlpZCI6Imluc18yTm10cGhQUklwU0tqZHNiOHNnNGd2ZjJURFUiLCJyaWQiOiJ1c2VyXzJObXd1QWdCZmVtaUh0bGU5TkswOG1sM0xheiIsImluaXRpYWxzIjoiRlkifQ","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_43":44,"_32":45,"_38":332,"_47":-5,"_48":25,"_49":50,"_51":50,"_52":53,"_54":-5,"_18":55,"_56":31,"_57":58,"_59":-5,"_60":-5,"_61":62,"_63":64,"_65":66,"_67":68,"_69":333,"_71":-5,"_72":73,"_74":73,"_75":76,"_77":76,"_78":76,"_79":73,"_80":73,"_81":334,"_83":335,"_85":336,"_87":25},"tree",[176,182,193,194,195],"files",[176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195],"counts",{"_166":62,"_167":144,"_168":62,"_169":170,"_171":172},"contents",[129,130,131,132,133],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_43":160,"_32":161,"_30":162,"_135":-5,"_41":42,"_40":163,"_136":58,"_38":164,"_13":62,"_33":158,"_35":-5,"_24":25,"_139":-5,"_27":165},{"_43":154,"_32":155,"_30":156,"_135":-5,"_41":42,"_40":144,"_136":58,"_38":157,"_13":62,"_33":158,"_35":-5,"_24":25,"_139":-5,"_27":159},{"_43":148,"_32":149,"_30":150,"_135":-5,"_41":42,"_40":144,"_136":25,"_38":151,"_13":62,"_33":20,"_35":152,"_24":25,"_139":-5,"_27":153},{"_43":141,"_32":142,"_30":143,"_135":-5,"_41":42,"_40":144,"_136":25,"_38":145,"_13":62,"_33":20,"_35":146,"_24":25,"_139":-5,"_27":147},{"_43":134,"_32":28,"_30":31,"_135":-5,"_41":42,"_40":14,"_136":25,"_38":137,"_13":138,"_33":34,"_35":37,"_24":25,"_139":-5,"_27":140},"3ef7ff6e-e29b-47b4-af06-58aae3289fe0","parentId","latest",["D",1787385012320],10,"label",[28],"bec3edd4-de87-44e1-8d87-e30ed84d02f0","README.md","01a0284c-1b46-711a-b263-1e3f3ba9965c",1,["D",1787382471418],"# 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",[142],"b5d3d126-3f9f-4e76-9dd6-b57a2130ef32","CHANGELOG.md","01a0284c-1b46-711a-b263-184ef9e69f49",["D",1787382471418],"# 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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