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",[],[175],{"_105":183,"_96":184,"_155":185,"_157":-5,"_158":140,"_159":186,"_161":162,"_107":187,"_101":32,"_164":165,"_166":188,"_168":22,"_169":-5,"_170":189,"_99":190},"2698c4c6-f0be-11f0-b526-42dde27851f2","DESIGN.MD","2698c598-f0be-11f0-b526-42dde27851f2",5,["D",1768335993012],"Set up a Typescript API for a todo list service. There should be three functions:\n\n1. newList() : String UUID\n This will create a new UUID, add it to the \"lists\" table in a sqlite db, and return the UUID\n2. updateList(uuid: String, list : List)\n This will add the List object to the database, overwriting the previous content.\n3. getList(uuid: String) : List\n This returns the list object from the database.\n\nList Object:\n This should be an array of \"listItem\"\n\nListItem Object:\n This should have two fields: bool isDone, and string Text\n\nDatabase table \"Lists\"\n Three columns: String UUID, Datetime Created, String ListJsonß",[],[184],{"_105":192,"_96":100,"_155":193,"_157":-5,"_158":140,"_159":194,"_161":22,"_107":195,"_101":196,"_164":197,"_166":198,"_168":22,"_169":97,"_170":199,"_99":200},"0d4d23ee-f0bf-11f0-a774-42dde27851f2","269ff0ac-f0be-11f0-be7a-42dde27851f2",11,["D",1768336380099],1,"http","import { Hono } from \"https://esm.sh/hono@4\";\nimport { newList, updateList, getList } from \"./api.ts\";\nimport type { List } from \"./types.ts\";\n\nconst app = new Hono();\n\n// Unwrap Hono errors to see original error details\napp.onError((err, c) => {\n throw err;\n});\n\n/**\n * POST /api/new\n * Creates a new list and returns its UUID\n */\napp.post(\"/api/new\", async (c) => {\n const uuid = await newList();\n return c.json({ uuid });\n});\n\n/**\n * POST /api/update/:uuid\n * Updates an existing list with new content\n * Body should be a JSON array of ListItem objects\n */\napp.post(\"/api/:uuid\", async (c) => {\n const uuid = c.req.param(\"uuid\");\n\n try {\n const list: List = await c.req.json();\n await updateList(uuid, list);\n return c.json({ success: true, uuid });\n } catch (error) {\n if (error instanceof Error && error.message.includes(\"not found\")) {\n return c.json({ error: error.message }, 404);\n }\n throw error;\n }\n});\n\n/**\n * GET /api/get/:uuid\n * Retrieves a list by its UUID\n */\napp.get(\"/api/:uuid\", async (c) => {\n const uuid = c.req.param(\"uuid\");\n\n try {\n const list = await getList(uuid);\n return c.json({ uuid, list });\n } catch (error) {\n if (error instanceof Error && error.message.includes(\"not found\")) {\n return c.json({ error: error.message }, 404);\n }\n throw error;\n }\n});\n\n// This is the entry point for HTTP vals\nexport default app.fetch;\n",[],[100],{"_105":202,"_96":203,"_155":204,"_157":-5,"_158":140,"_159":205,"_161":162,"_107":206,"_101":196,"_164":207,"_166":208,"_168":22,"_169":-5,"_170":209,"_99":210},"0d468610-f0bf-11f0-9b57-42dde27851f2","api.ts","268ea18a-f0be-11f0-9ea1-42dde27851f2",10,["D",1768336380050],"script","import { getDatabase, initDatabase } from \"./db.ts\";\nimport type { List } from \"./types.ts\";\n\n/**\n * Create a new list and return its UUID\n * @returns {string} UUID of the newly created list\n */\nexport async function newList(): Promise {\n await initDatabase();\n const db = getDatabase();\n\n // Generate a UUID (using crypto.randomUUID() which is available in Deno)\n const uuid = crypto.randomUUID();\n\n // Get current datetime in ISO format\n const created = new Date().toISOString();\n\n // Initialize with an empty list\n const emptyList: List = [];\n const listJson = JSON.stringify(emptyList);\n\n // Insert into database\n await db.execute(\n \"INSERT INTO Lists (UUID, Created, ListJson) VALUES (?, ?, ?)\",\n [uuid, created, listJson]\n );\n\n return uuid;\n}\n\n/**\n * Update a list with new content\n * @param {string} uuid - The UUID of the list to update\n * @param {List} list - The list content to save\n */\nexport async function updateList(uuid: string, list: List): Promise {\n await initDatabase();\n const db = getDatabase();\n\n // Convert list to JSON\n const listJson = JSON.stringify(list);\n\n // Update the list in the database\n await db.execute(\n \"UPDATE Lists SET ListJson = ? WHERE UUID = ?\",\n [listJson, uuid]\n );\n\n // Verify the list exists by trying to fetch it\n const result = await db.execute(\n \"SELECT UUID FROM Lists WHERE UUID = ?\",\n [uuid]\n );\n\n if (!result.rows || result.rows.length === 0) {\n throw new Error(`List with UUID ${uuid} not found`);\n }\n}\n\n/**\n * Get a list by UUID\n * @param {string} uuid - The UUID of the list to retrieve\n * @returns {List} The list content\n */\nexport async function getList(uuid: string): Promise {\n await initDatabase();\n const db = getDatabase();\n\n // Query for the list\n const result = await db.execute(\n \"SELECT ListJson FROM Lists WHERE UUID = ?\",\n [uuid]\n );\n\n // Check if list exists\n if (!result.rows || result.rows.length === 0) {\n console.log(`List with UUID ${uuid} not found`)\n throw new Error(`List with UUID ${uuid} not found`);\n }\n\n // Parse and return the list\n const listJson = result.rows[0][0] as string;\n return JSON.parse(listJson) as List;\n}\n",[],[203],{"_105":212,"_96":213,"_155":214,"_157":-5,"_158":140,"_159":215,"_161":162,"_107":216,"_101":32,"_164":207,"_166":217,"_168":22,"_169":-5,"_170":218,"_99":219},"26b24cfc-f0be-11f0-8e4b-42dde27851f2","db.ts","26b24dce-f0be-11f0-8e4b-42dde27851f2",9,["D",1768335993204],"import { sqlite } from \"https://esm.town/v/stevekrouse/sqlite\";\n\nconst TABLE_NAME = \"Lists\";\n\nlet initialized = false;\n\n/**\n * Initialize the SQLite database and create the Lists table if it doesn't exist\n */\nexport async function initDatabase(): Promise {\n if (initialized) {\n return;\n }\n\n // Create the Lists table with three columns: UUID, Created, ListJson\n await sqlite.execute(`\n CREATE TABLE IF NOT EXISTS ${TABLE_NAME} (\n UUID TEXT PRIMARY KEY,\n Created DATETIME NOT NULL,\n ListJson TEXT NOT NULL\n )\n `);\n\n initialized = true;\n}\n\n/**\n * Get the sqlite instance\n */\nexport function getDatabase() {\n return sqlite;\n}\n",[],[213],{"_105":221,"_96":222,"_155":223,"_157":-5,"_158":140,"_159":224,"_161":162,"_107":225,"_101":32,"_164":165,"_166":226,"_168":22,"_169":-5,"_170":227,"_99":228},"268aef22-f0be-11f0-ad8a-42dde27851f2","deno.json","268aefd6-f0be-11f0-ad8a-42dde27851f2",2,["D",1768335992919],"{\n \"$schema\": \"https://raw.githubusercontent.com/denoland/deno/98f62cee78e85bfc47c62ed703777c6bc8794f1c/cli/schemas/config-file.v1.json\",\n \"lock\": false,\n \"compilerOptions\": {\n \"noImplicitAny\": false,\n \"strict\": true,\n \"types\": [\"https://www.val.town/types/valtown.d.ts\"],\n \"lib\": [\n \"dom\",\n \"dom.iterable\",\n \"dom.asynciterable\",\n \"deno.ns\",\n \"deno.unstable\"\n ]\n },\n \"lint\": {\n \"include\": [\"deno:/https/esm.town/**/*\"],\n \"rules\": {\n \"exclude\": [\"no-explicit-any\"]\n }\n },\n \"node_modules_dir\": false,\n \"experimental\": {\n \"unstable-node-globals\": true,\n \"unstable-temporal\": true,\n \"unstable-worker-options\": true,\n \"unstable-sloppy-imports\": true\n }\n}",[],[222],{"_105":230,"_96":231,"_155":232,"_157":-5,"_158":140,"_159":102,"_161":162,"_107":233,"_101":32,"_164":165,"_166":234,"_168":22,"_169":-5,"_170":235,"_99":236},"406ba5a0-f0c1-11f0-aab4-42dde27851f2","index.html","406ba64a-f0c1-11f0-aab4-42dde27851f2",["D",1768337324825],"\n\n\n \n \n Todo List Service\n \n\n\n

Todo List Service

Welcome to the Todo List Service. This service allows you to create and manage simple todo lists.

Each list gets a unique ID that you can use to access and update your list from anywhere.

\n \n

\n\n\n",[],[231],{"_105":238,"_96":239,"_155":240,"_157":-5,"_158":140,"_159":241,"_161":22,"_107":242,"_101":32,"_164":165,"_166":243,"_168":22,"_169":-5,"_170":244,"_99":245},"40669a6a-f0c1-11f0-9fc7-42dde27851f2","list.html","40669b32-f0c1-11f0-9fc7-42dde27851f2",12,["D",1768337324824],"\n\n\n \n \n Todo List\n \n\n\n

Todo List

List ID: {{UUID}}

\n\n \n\n \n

\n\n \n\n\n",[],[239],{"_105":247,"_96":248,"_155":249,"_157":-5,"_158":140,"_159":196,"_161":162,"_107":250,"_101":32,"_164":207,"_166":251,"_168":22,"_169":-5,"_170":252,"_99":253},"2685ac4c-f0be-11f0-b428-42dde27851f2","mod.ts","2685ad00-f0be-11f0-b428-42dde27851f2",["D",1768335992917],"// Main export file for the todo list service\nexport { newList, updateList, getList } from \"./api.ts\";\nexport { initDatabase } from \"./db.ts\";\nexport type { List, ListItem } from \"./types.ts\";\n",[],[248],{"_105":255,"_96":256,"_155":257,"_157":-5,"_158":140,"_159":258,"_161":162,"_107":259,"_101":32,"_164":207,"_166":260,"_168":22,"_169":-5,"_170":261,"_99":262},"269576cc-f0be-11f0-901f-42dde27851f2","types.ts","2695779e-f0be-11f0-901f-42dde27851f2",4,["D",1768335993001],"/**\n * ListItem represents a single todo item\n */\nexport interface ListItem {\n isDone: boolean;\n text: string;\n}\n\n/**\n * List is an array of ListItem objects\n */\nexport type List = ListItem[];\n",[],[256],"files",[152,173,182,191,201,211,220,229,237,246,254],"counts",{"_267":32,"_268":196,"_269":32,"_270":271},"pulls","branches","forks","envVars",{"_272":32,"_273":32},"count","emptyCount","contents",[],{"_105":192,"_96":100,"_155":193,"_157":-5,"_158":140,"_159":194,"_161":22,"_107":277,"_101":196,"_164":197,"_166":198,"_168":22,"_169":97,"_99":278},["D",1768336380099],[100],"upstreamProject","upstreamBranch","emptyEnvVars","isNew","flags",[],"routes/_app.x.$handle.$name.branch.$branch.version.$version.code.$",{"_94":95,"_96":97,"_98":44,"_101":102,"_99":100,"_103":287,"_150":292,"_263":326,"_165":327,"_274":329,"_330":-5,"_331":-5,"_332":-5,"_333":-5,"_334":335,"_270":-5},{"_105":106,"_96":97,"_107":288,"_109":-5,"_110":22,"_111":112,"_113":73,"_114":-5,"_14":115,"_116":-5,"_117":22,"_118":-5,"_119":-5,"_120":32,"_16":121,"_122":123,"_124":123,"_125":126,"_127":126,"_128":126,"_129":123,"_130":123,"_23":289,"_134":290,"_137":291,"_149":22},["D",1768335221491],{"_94":95,"_132":133},{"_94":95,"_136":133,"_14":115},{"_101":139,"_96":44,"_105":140,"_141":106,"_142":-5,"_143":-5,"_144":-5,"_145":-5,"_146":-5,"_147":97,"_148":95},[293,296,299,302,305,308,311,314,317,320,323],{"_105":153,"_96":154,"_155":156,"_157":-5,"_158":140,"_159":160,"_161":162,"_107":163,"_101":32,"_164":165,"_166":167,"_168":22,"_169":-5,"_170":294,"_99":295},[],[154],{"_105":174,"_96":175,"_155":176,"_157":-5,"_158":140,"_159":177,"_161":162,"_107":178,"_101":32,"_164":165,"_166":179,"_168":22,"_169":-5,"_170":297,"_99":298},[],[175],{"_105":183,"_96":184,"_155":185,"_157":-5,"_158":140,"_159":186,"_161":162,"_107":187,"_101":32,"_164":165,"_166":188,"_168":22,"_169":-5,"_170":300,"_99":301},[],[184],{"_105":192,"_96":100,"_155":193,"_157":-5,"_158":140,"_159":194,"_161":22,"_107":195,"_101":196,"_164":197,"_166":198,"_168":22,"_169":97,"_170":303,"_99":304},[],[100],{"_105":202,"_96":203,"_155":204,"_157":-5,"_158":140,"_159":205,"_161":162,"_107":206,"_101":196,"_164":207,"_166":208,"_168":22,"_169":-5,"_170":306,"_99":307},[],[203],{"_105":212,"_96":213,"_155":214,"_157":-5,"_158":140,"_159":215,"_161":162,"_107":216,"_101":32,"_164":207,"_166":217,"_168":22,"_169":-5,"_170":309,"_99":310},[],[213],{"_105":221,"_96":222,"_155":223,"_157":-5,"_158":140,"_159":224,"_161":162,"_107":225,"_101":32,"_164":165,"_166":226,"_168":22,"_169":-5,"_170":312,"_99":313},[],[222],{"_105":230,"_96":231,"_155":232,"_157":-5,"_158":140,"_159":102,"_161":162,"_107":233,"_101":32,"_164":165,"_166":234,"_168":22,"_169":-5,"_170":315,"_99":316},[],[231],{"_105":238,"_96":239,"_155":240,"_157":-5,"_158":140,"_159":241,"_161":22,"_107":242,"_101":32,"_164":165,"_166":243,"_168":22,"_169":-5,"_170":318,"_99":319},[],[239],{"_105":247,"_96":248,"_155":249,"_157":-5,"_158":140,"_159":196,"_161":162,"_107":250,"_101":32,"_164":207,"_166":251,"_168":22,"_169":-5,"_170":321,"_99":322},[],[248],{"_105":255,"_96":256,"_155":257,"_157":-5,"_158":140,"_159":258,"_161":162,"_107":259,"_101":32,"_164":207,"_166":260,"_168":22,"_169":-5,"_170":324,"_99":325},[],[256],[293,296,299,302,305,308,311,314,317,320,323],{"_105":192,"_96":100,"_155":193,"_157":-5,"_158":140,"_159":194,"_161":22,"_107":277,"_101":196,"_164":197,"_166":198,"_168":22,"_169":97,"_99":328},[100],[],"upstream","pull","ahead","behind","templates",[],"actionData","errors"]

flymaster

lists