Hi

\"\n});\n```\n\n## Val Town Utility Functions\n\nVal Town provides several utility functions to help with common project tasks.\n\n### Importing Utilities\n\nAlways import utilities with version pins to avoid breaking changes:\n\n```ts\nimport { parseProject, readFile, serveFile } from \"https://esm.town/v/std/utils@85-main/index.ts\";\n```\n\n### Available Utilities\n\n\n#### **serveFile** - Serve project files with proper content types\n\nFor example, in Hono:\n\n```ts\n// serve all files in frontend/ and shared/\napp.get(\"/frontend/*\", c => serveFile(c.req.path, import.meta.url));\napp.get(\"/shared/*\", c => serveFile(c.req.path, import.meta.url));\n```\n\n#### **readFile** - Read files from within the project:\n\n```ts\n// Read a file from the project\nconst fileContent = await readFile(\"/frontend/index.html\", import.meta.url);\n```\n\n#### **listFiles** - List all files in the project\n\n```ts\nconst files = await listFiles(import.meta.url);\n```\n\n#### **parseProject** - Extract information about the current project from import.meta.url\n\nThis is useful for including info for linking back to a val, ie in \"view source\" urls:\n\n```ts\nconst projectVal = parseProject(import.meta.url);\nconsole.log(projectVal.username); // Owner of the project\nconsole.log(projectVal.name); // Project name\nconsole.log(projectVal.version); // Version number\nconsole.log(projectVal.branch); // Branch name\nconsole.log(projectVal.links.self.project); // URL to the project page\n```\n\nHowever, it's *extremely importing* to note that `parseProject` and other Standard Library utilities ONLY RUN ON THE SERVER.\nIf you need access to this data on the client, run it in the server and pass it to the client by splicing it into the HTML page\nor by making an API request for it.\n\n## Val Town Platform Specifics\n\n- **Redirects:** Use `return new Response(null, { status: 302, headers: { Location: \"/place/to/redirect\" }})` instead of `Response.redirect` which is broken\n- **Images:** Avoid external images or base64 images. Use emojis, unicode symbols, or icon fonts/libraries instead\n- **AI Image:** To inline generate an AI image use: `

`\n- **Storage:** DO NOT use the Deno KV module for storage\n- **Browser APIs:** DO NOT use the `alert()`, `prompt()`, or `confirm()` methods\n- **Weather Data:** Use open-meteo for weather data (doesn't require API keys) unless otherwise specified\n- **View Source:** Add a view source link by importing & using `import.meta.url.replace(\"ems.sh\", \"val.town)\"` (or passing this data to the client) and include `target=\"_top\"` attribute\n- **Error Debugging:** Add `` to HTML to capture client-side errors\n- **Error Handling:** Only use try...catch when there's a clear local resolution; Avoid catches that merely log or return 500s. Let errors bubble up with full context\n- **Environment Variables:** Use `Deno.env.get('keyname')` when you need to, but generally prefer APIs that don't require keys\n- **Imports:** Use `https://esm.sh` for npm and Deno dependencies to ensure compatibility on server and browser\n- **Storage Strategy:** Only use backend storage if explicitly required; prefer simple static client-side sites\n- **React Configuration:** When using React libraries, pin versions with `?deps=react@18.2.0,react-dom@18.2.0` and start the file with `/** @jsxImportSource https://esm.sh/react@18.2.0 */`\n- Ensure all React dependencies and sub-dependencies are pinned to the same version\n- **Styling:** Default to using TailwindCSS via `` unless otherwise specified\n\n## Project Structure and Design Patterns\n\n### Recommended Directory Structure\n```\n├── backend/\n│ ├── database/\n│ │ ├── migrations.ts # Schema definitions\n│ │ ├── queries.ts # DB query functions\n│ │ └── README.md\n│ └── routes/ # Route modules\n│ ├── [route].ts\n│ └── static.ts # Static file serving\n│ ├── index.ts # Main entry point\n│ └── README.md\n├── frontend/\n│ ├── components/\n│ │ ├── App.tsx\n│ │ └── [Component].tsx\n│ ├── favicon.svg\n│ ├── index.html # Main HTML template\n│ ├── index.tsx # Frontend JS entry point\n│ ├── README.md\n│ └── style.css\n├── README.md\n└── shared/\n ├── README.md\n └── utils.ts # Shared types and functions\n```\n\n### Backend (Hono) Best Practices\n\n- Hono is the recommended API framework\n- Main entry point should be `backend/index.ts`\n- **Static asset serving:** Use the utility functions to read and serve project files:\n ```ts\n import { readFile, serveFile } from \"https://esm.town/v/std/utils@85-main/index.ts\";\n \n // serve all files in frontend/ and shared/\n app.get(\"/frontend/*\", c => serveFile(c.req.path, import.meta.url));\n app.get(\"/shared/*\", c => serveFile(c.req.path, import.meta.url));\n \n // For index.html, often you'll want to bootstrap with initial data\n app.get(\"/\", async c => {\n let html = await readFile(\"/frontend/index.html\", import.meta.url);\n \n // Inject data to avoid extra round-trips\n const initialData = await fetchInitialData();\n const dataScript = ``;\n \n html = html.replace(\"\", `${dataScript}`);\n return c.html(html);\n });\n ```\n- Create RESTful API routes for CRUD operations\n- Always include this snippet at the top-level Hono app to re-throwing errors to see full stack traces:\n ```ts\n // Unwrap Hono errors to see original error details\n app.onError((err, c) => {\n throw err;\n });\n ```\n\n### Database Patterns\n- Run migrations on startup or comment out for performance\n- Change table names when modifying schemas rather than altering\n- Export clear query functions with proper TypeScript typing\n\n## Common Gotchas and Solutions\n\n1. **Environment Limitations:** \n - Val Town runs on Deno in a serverless context, not Node.js\n - Code in `shared/` must work in both frontend and backend environments\n - Cannot use `Deno` keyword in shared code\n - Use `https://esm.sh` for imports that work in both environments\n\n2. **SQLite Peculiarities:**\n - Limited support for ALTER TABLE operations\n - Create new tables with updated schemas and copy data when needed\n - Always run table creation before querying\n\n3. **React Configuration:**\n - All React dependencies must be pinned to 18.2.0\n - Always include `@jsxImportSource https://esm.sh/react@18.2.0` at the top of React files\n - Rendering issues often come from mismatched React versions\n\n4. **File Handling:**\n - Val Town only supports text files, not binary\n - Use the provided utilities to read files across branches and forks\n - For files in the project, use `readFile` helpers\n\n5. **API Design:**\n - `fetch` handler is the entry point for HTTP vals\n - Run the Hono app with `export default app.fetch // This is the entry point for HTTP vals`\n\n",[],[180],"7d40f2d2-006b-11f1-bfdc-42dde27851f2",".vtignore","7d40f3ae-006b-11f1-bfdc-42dde27851f2",12,["D",1770059708793],".cursor\n.git\n.vscode\n.cursorrules\n.DS_Store\nnode_modules\nvendor",[],[188],"7d2597e4-006b-11f1-bc9e-42dde27851f2","types.ts","7d259938-006b-11f1-bc9e-42dde27851f2","7cb9230c-006b-11f1-b04b-42dde27851f2",9,["D",1770059708612],"script","/**\n * Contrato externo: lo que R y Python pueden enviar.\n * No asume estructuras complejas; tolera NULL/None en campos opcionales.\n */\n\n/** Choices: vector simple, array de {value, label?}, o diccionario nombrado (label por value) */\nexport type RawChoices =\n | string[]\n | Array<{ value: string; label?: string }>\n | Record;\n\n/** Entrada cruda del widget; todos los campos opcionales excepto choices */\nexport interface RawInput {\n inputId?: string | null;\n choices: RawChoices;\n selected?: string | string[] | null;\n min_items?: number | null;\n max_items?: number | null;\n}\n\n/**\n * Modelo interno estable después de normalización.\n * Sin ambigüedad; listo para validación y render.\n */\nexport interface NormalizedModel {\n inputId: string;\n options: Array<{ value: string; label: string }>;\n selected: string[];\n min_items: number;\n max_items: number;\n}\n\n/**\n * Modelo para render: opciones con flag selected para evitar lógica condicional.\n */\nexport interface RenderOption {\n value: string;\n label: string;\n selected: boolean;\n}\n\nexport interface RenderModel {\n inputId: string;\n options: RenderOption[];\n min_items: number;\n max_items: number;\n}\n\n/** Error de validación con mensaje claro */\nexport interface ValidationError {\n code: string;\n message: string;\n}\n",[],[205,196],"shared","de1cbf34-006e-11f1-949e-42dde27851f2","api-schema.ts","de1cc006-006e-11f1-949e-42dde27851f2",16,["D",1770061159797],"/**\n * Schema estable de la API del Web Val.\n * R / Python → Web Val (HTTP real) → JSON (este schema) → Widget reutilizable.\n */\n\n/** Opción en la respuesta: value, label, selected (listo para render). */\nexport interface ApiOption {\n value: string;\n label: string;\n selected: boolean;\n}\n\n/** Payload de éxito: datos listos para que el widget renderice. */\nexport interface ApiSuccessData {\n inputId: string;\n options: ApiOption[];\n min_items: number;\n max_items: number;\n}\n\n/** Respuesta 200: ok + data. */\nexport interface ApiSuccessResponse {\n ok: true;\n data: ApiSuccessData;\n}\n\n/** Respuesta 400: ok false + error. */\nexport interface ApiErrorResponse {\n ok: false;\n error: { code: string; message: string };\n}\n\nexport type ApiResponse = ApiSuccessResponse | ApiErrorResponse;\n",[],[205,207],"7cb92230-006b-11f1-b04b-42dde27851f2",2,["D",1770059707913],[146,147],[205],["D",1770061950478],[],[18],"abf0f3f8-0074-11f1-86b5-42dde27851f2","validate.ts","7cf05dea-006b-11f1-bfdc-42dde27851f2","7c925240-006b-11f1-8d7b-42dde27851f2",21,["D",1770063652600],"import type { NormalizedModel, ValidationError } from \"../shared/types.ts\";\n\n/**\n * Resultado de validación: ok con modelo o error con mensaje claro.\n */\nexport type ValidationResult =\n | { ok: true; model: NormalizedModel }\n | { ok: false; error: ValidationError };\n\n/**\n * Reglas de negocio mínimas: coherencia min/max y selección válida.\n * Errores tempranos y claros.\n */\nexport function validate(model: NormalizedModel): ValidationResult {\n if (model.min_items > model.max_items) {\n return {\n ok: false,\n error: {\n code: \"MIN_MAX_INCOHERENT\",\n message: `min_items (${model.min_items}) cannot be greater than max_items (${model.max_items}).`,\n },\n };\n }\n\n if (model.max_items === 0 && model.selected.length > 0) {\n return {\n ok: false,\n error: {\n code: \"NO_SELECTION_ALLOWED\",\n message: \"When max_items is 0, no items may be selected.\",\n },\n };\n }\n\n if (model.max_items > model.options.length) {\n return {\n ok: false,\n error: {\n code: \"MAX_EXCEEDS_OPTIONS\",\n message: `max_items (${model.max_items}) cannot exceed number of choices (${model.options.length}).`,\n },\n };\n }\n\n const invalid = model.selected.filter((v) => !model.options.some((o) => o.value === v));\n if (invalid.length > 0) {\n return {\n ok: false,\n error: {\n code: \"INVALID_SELECTION\",\n message: `Selected value(s) not in choices: ${invalid.join(\", \")}.`,\n },\n };\n }\n\n if (model.selected.length < model.min_items) {\n return {\n ok: false,\n error: {\n code: \"BELOW_MIN_ITEMS\",\n message: `At least ${model.min_items} item(s) must be selected; got ${model.selected.length}.`,\n },\n };\n }\n\n if (model.selected.length > model.max_items) {\n return {\n ok: false,\n error: {\n code: \"ABOVE_MAX_ITEMS\",\n message: `At most ${model.max_items} item(s) may be selected; got ${model.selected.length}.`,\n },\n };\n }\n\n return { ok: true, model };\n}\n",[],[231,223],"backend","7d222a50-006b-11f1-af6a-42dde27851f2","render.ts","7d222b86-006b-11f1-af6a-42dde27851f2",8,["D",1770059708509],"import type { NormalizedModel, RenderModel } from \"../shared/types.ts\";\n\n/**\n * Prepara datos para la UI: marca qué opciones están seleccionadas\n * para evitar lógica condicional en el render.\n */\nexport function toRenderModel(model: NormalizedModel): RenderModel {\n const selectedSet = new Set(model.selected);\n return {\n inputId: model.inputId,\n options: model.options.map((o) => ({\n value: o.value,\n label: o.label,\n selected: selectedSet.has(o.value),\n })),\n min_items: model.min_items,\n max_items: model.max_items,\n };\n}\n\n/**\n * Genera HTML autocontenido: estructura clara, sin estado global ni dependencias externas.\n * Usa atributos data- para integración con clientes (R/Python) si lo necesitan.\n */\nexport function renderHtml(render: RenderModel): string {\n const optionsHtml = render.options\n .map(\n (o) =>\n ``\n )\n .join(\"\\n\");\n\n return `\n\n\n \n \n Selectize – ${escapeHtml(render.inputId)}\n \n\n\n \n\n`;\n}\n\nfunction escapeHtml(s: string): string {\n return s\n .replace(/&/g, \"&\")\n .replace(//g, \">\")\n .replace(/\"/g, \""\");\n}\n",[],[231,233],"7d1854c6-006b-11f1-b04b-42dde27851f2","normalize.ts","7d1855a2-006b-11f1-b04b-42dde27851f2",7,["D",1770059708502],"import type { RawInput, NormalizedModel, RawChoices } from \"../shared/types.ts\";\n\n/**\n * Convierte choices heterogéneos en array de { value, label }.\n * - Vector simple: value y label iguales.\n * - Array de objetos: usa value y label (label por defecto = value).\n * - Record: entradas → value = clave, label = valor.\n */\nfunction normalizeChoices(raw: RawChoices): Array<{ value: string; label: string }> {\n if (Array.isArray(raw)) {\n const first = raw[0];\n if (first === null || first === undefined) return [];\n if (typeof first === \"string\") {\n return (raw as string[]).map((s) => ({ value: String(s), label: String(s) }));\n }\n return (raw as Array<{ value: string; label?: string }>).map((o) => ({\n value: String(o.value),\n label: o.label != null ? String(o.label) : String(o.value),\n }));\n }\n if (raw !== null && typeof raw === \"object\") {\n return Object.entries(raw).map(([value, label]) => ({\n value: String(value),\n label: String(label),\n }));\n }\n return [];\n}\n\n/**\n * Convierte selected en array de strings; tolera null/undefined y string único.\n * No filtra por choices; la validación comprueba coherencia.\n */\nfunction normalizeSelected(raw: RawInput[\"selected\"]): string[] {\n if (raw == null) return [];\n if (typeof raw === \"string\") return raw.trim() === \"\" ? [] : [raw.trim()];\n if (Array.isArray(raw)) {\n return raw\n .filter((s) => s != null && String(s).trim() !== \"\")\n .map((s) => String(s).trim());\n }\n return [];\n}\n\n/**\n * Normaliza la entrada cruda en modelo interno estable.\n * Aplica valores por defecto y elimina ambigüedad.\n */\nexport function normalize(raw: RawInput): NormalizedModel {\n const options = normalizeChoices(raw.choices);\n const selected = normalizeSelected(raw.selected);\n\n const min_items =\n raw.min_items != null && Number.isFinite(Number(raw.min_items))\n ? Math.max(0, Math.floor(Number(raw.min_items)))\n : 0;\n const max_items =\n raw.max_items != null && Number.isFinite(Number(raw.max_items))\n ? Math.max(0, Math.floor(Number(raw.max_items)))\n : options.length;\n\n const inputId =\n raw.inputId != null && String(raw.inputId).trim() !== \"\"\n ? String(raw.inputId).trim()\n : \"selectize\";\n\n return {\n inputId,\n options,\n selected,\n min_items,\n max_items,\n };\n}\n",[],[231,241],"b598fda0-0070-11f1-96e2-42dde27851f2","index.ts","7d11edc0-006b-11f1-9c28-42dde27851f2",20,["D",1770061950810],"import { Hono } from \"https://esm.sh/hono@4.6.12\";\nimport type { RawInput } from \"../shared/types.ts\";\nimport { normalize } from \"./normalize.ts\";\nimport { validate } from \"./validate.ts\";\nimport { toRenderModel, renderHtml } from \"./render.ts\";\n\nconst app = new Hono();\n\napp.onError((err, c) => {\n throw err;\n});\n\n/**\n * orquestador HTTP (Hono)\n * Widget selector: request → parse → normalize → validate → render → response.\n * POST /widget: body JSON (RawInput).\n * GET /widget: query params para pruebas (choices como JSON string, etc.).\n */\napp.all(\"/widget\", async (c) => {\n let raw: RawInput;\n\n if (c.req.method === \"POST\") {\n try {\n const body = await c.req.json();\n if (body === null || typeof body !== \"object\") {\n return c.json(\n { code: \"INVALID_BODY\", message: \"Body must be a JSON object with at least 'choices'.\" },\n 400\n );\n }\n if (!(\"choices\" in body)) {\n return c.json(\n { code: \"MISSING_CHOICES\", message: \"Field 'choices' is required.\" },\n 400\n );\n }\n raw = body as RawInput;\n } catch {\n return c.json(\n { code: \"PARSE_ERROR\", message: \"Invalid JSON body.\" },\n 400\n );\n }\n } else {\n const inputId = c.req.query(\"inputId\") ?? undefined;\n const choicesParam = c.req.query(\"choices\");\n const selectedParam = c.req.query(\"selected\");\n const min_items = c.req.query(\"min_items\");\n const max_items = c.req.query(\"max_items\");\n\n let choices: RawInput[\"choices\"];\n try {\n choices = choicesParam ? JSON.parse(choicesParam) : [\"A\", \"B\", \"C\"];\n } catch {\n return c.json(\n { code: \"PARSE_ERROR\", message: \"Query 'choices' must be valid JSON (array or object).\" },\n 400\n );\n }\n\n let selected: string | string[] | undefined;\n if (selectedParam !== undefined) {\n try {\n const parsed = JSON.parse(selectedParam);\n selected = typeof parsed === \"string\" ? parsed : Array.isArray(parsed) ? parsed : undefined;\n } catch {\n selected = selectedParam;\n }\n }\n\n raw = {\n inputId: inputId || null,\n choices,\n selected: selected ?? null,\n min_items: min_items != null ? Number(min_items) : null,\n max_items: max_items != null ? Number(max_items) : null,\n };\n }\n\n const model = normalize(raw);\n const result = validate(model);\n\n if (!result.ok) {\n return c.json({ code: result.error.code, message: result.error.message }, 400);\n }\n\n const renderModel = toRenderModel(result.model);\n const html = renderHtml(renderModel);\n\n return c.html(html);\n});\n\nexport { app };\n",[],[231,249],"7c924f70-006b-11f1-8d7b-42dde27851f2",["D",1770059707656],[140,141,142,143],[231],["D",1769714183415],{"_11":12,"_96":92},{"_11":12,"_89":90,"_91":92,"_31":50,"_93":94,"_95":30},{"_78":79,"_13":16,"_38":80,"_81":39,"_82":-5,"_83":-5,"_84":-5,"_85":-5,"_86":-5,"_87":14,"_88":12},"ctx",{"_71":-5,"_115":297,"_298":299,"_300":301,"_302":30,"_303":30,"_304":30,"_305":24,"_306":-5,"_307":-7,"_308":-7,"_309":26,"_310":30,"_311":30,"_312":-5,"_313":30,"_314":30,"_315":30,"_316":-5},"ENV",{"_268":269,"_270":271,"_272":16,"_273":274,"_275":276,"_277":278,"_279":280,"_281":282,"_283":284,"_285":286,"_287":288,"_289":290,"_291":292,"_293":294,"_295":296},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

History · examples