Feedbin Digest - ${new Date().toLocaleDateString()}

Tags: ${includedTags.join(\", \")}

\n ${includedTags\n .map((tag: string) => {\n const feedIdsForTag = feedIdsByTag[tag] ?? [];\n const feedsWithEntries = feedIdsForTag\n .map((feedId) => ({\n feedId,\n entries: entriesByFeedId.get(feedId) ?? [],\n }))\n .filter((feed) => feed.entries.length > 0);\n\n if (feedsWithEntries.length === 0) return undefined;\n return `\n

${tag}

\n ${feedsWithEntries\n .map(({ feedId, entries }) => {\n const feedTitle = feedIdToTitle[feedId] ?? `Feed ${feedId}`;\n const faviconImg = feedIdToFaviconUrl[feedId]\n ? ` $\"\"$ `\n : \"\";\n\n return `\n

${faviconImg}${escape(feedTitle)}

\n ${entry.title ? escape(entry.title) : \"\"} — ${published}
\n mark read · \n mark unread\n

`;\n })\n .join(\"\\n\")}`;\n })\n .filter((s) => s !== undefined)\n .join(\"\\n\")}\n

\n `;\n\n const transporter = nodemailer.createTransport({\n service: Deno.env.get(\"nodemailer_service\"),\n auth: {\n user: Deno.env.get(\"email_user\"),\n pass: Deno.env.get(\"email_password\"),\n },\n });\n\n await transporter.sendMail({\n from: Deno.env.get(\"email_user\"),\n to: Deno.env.get(\"destination_email\"),\n subject: \"Feedbin Digest\",\n html: htmlBody,\n });\n\n await pruneCache();\n}\n","deleted","label",[117],"d5596906-132e-11f1-abd1-42dde27851f2","feedbin.ts","2fae369e-10fe-11f1-927e-42dde27851f2",226,["D",1772122729384],22,"script","import { blob } from \"https://esm.town/v/std/blob\";\n\ninterface CacheEntry {\n etag?: string;\n lastModified?: string;\n body: any;\n}\n\nconst CACHE_PREFIX = \"feedbin-email-digest_cache_\";\n\n/** Build a blob-storage key from the endpoint */\nconst cacheKey = (endpoint: string) =>\n `${CACHE_PREFIX}${endpoint.replace(/[^a-zA-Z0-9_.-]/g, \"_\")}`;\n\n/** Tracks which endpoints were actually called during this run */\nconst calledEndpoints = new Set();\n\n/** Remove cached entries for endpoints that weren't called this run */\nexport const pruneCache = async () => {\n const allBlobs = await blob.list(CACHE_PREFIX);\n const activeKeys = new Set([...calledEndpoints].map((ep) => cacheKey(ep)));\n const stale = allBlobs.filter((b) => !activeKeys.has(b.key));\n await Promise.all(stale.map((b) => blob.delete(b.key)));\n if (stale.length > 0) {\n console.log(\n `[feedbin] pruned ${stale.length} stale cache entries: ${stale.map((b) => b.key).join(\", \")}`,\n );\n }\n calledEndpoints.clear();\n};\n\nexport const feedbin = async (endpoint: string, method = \"GET\", body?: any) => {\n calledEndpoints.add(endpoint);\n\n // Only cache GET requests\n const useCache = method === \"GET\" && !body;\n\n let cached: CacheEntry | null = null;\n if (useCache) {\n try {\n cached = await blob.getJSON(cacheKey(endpoint));\n } catch {\n // No cached entry – proceed without conditional headers\n }\n }\n\n const conditionalHeaders: Record = {};\n if (cached?.etag) conditionalHeaders[\"If-None-Match\"] = cached.etag;\n if (cached?.lastModified)\n conditionalHeaders[\"If-Modified-Since\"] = cached.lastModified;\n\n const res = await fetch(`https://api.feedbin.com/v2/${endpoint}`, {\n method,\n headers: {\n Authorization:\n \"Basic \" +\n btoa(\n `${Deno.env.get(\"feedbin_user\")}:${Deno.env.get(\"feedbin_password\")}`,\n ),\n ...([\"POST\", \"PUT\", \"PATCH\", \"DELETE\"].includes(method)\n ? { \"Content-Type\": \"application/json; charset=utf-8\" }\n : {}),\n ...conditionalHeaders,\n },\n body: body ? JSON.stringify(body) : undefined,\n });\n\n // 304 Not Modified — return cached body as a synthetic Response\n if (res.status === 304 && cached) {\n console.log(`[feedbin] 304 cache hit: ${endpoint}`);\n return new Response(JSON.stringify(cached.body), {\n status: 200,\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n\n // For successful GET responses, update the cache\n if (useCache && res.ok) {\n const cloned = res.clone();\n const responseBody = await cloned.json();\n const entry: CacheEntry = {\n etag: res.headers.get(\"ETag\") ?? undefined,\n lastModified: res.headers.get(\"Last-Modified\") ?? undefined,\n body: responseBody,\n };\n await blob.setJSON(cacheKey(endpoint), entry);\n console.log(`[feedbin] 200 cached: ${endpoint}`);\n }\n\n return res;\n};\n",[135],"0be09d20-1288-11f1-a6fb-42dde27851f2","feedbin-schemas.ts","8859c5c4-e84a-11f0-a66a-42dde27851f2",191,["D",1772051094905],7,"import { z } from \"npm:zod@3.22.4\";\n\n// Feedbin API: https://github.com/feedbin/feedbin-api/tree/master/content\n\nexport const FeedbinTaggingSchema = z.object({\n id: z.number(),\n feed_id: z.number(),\n name: z.string(),\n});\n\nexport const FeedbinEntrySchema = z.object({\n id: z.number(),\n feed_id: z.number(),\n title: z.string().nullable(),\n author: z.string().nullable(),\n summary: z.string(),\n content: z.string().nullable(),\n url: z.string().url(),\n extracted_content_url: z.string().url(),\n published: z.string(),\n created_at: z.string(),\n});\n\nexport const FeedbinSubscriptionSchema = z.object({\n id: z.number(),\n created_at: z.string(),\n feed_id: z.number(),\n title: z.string(),\n feed_url: z.string().url(),\n site_url: z.string().url(),\n});\n\nexport const FeedbinTaggingsResponseSchema = z.array(FeedbinTaggingSchema);\nexport const FeedbinEntriesResponseSchema = z.array(FeedbinEntrySchema);\nexport const FeedbinSubscriptionsResponseSchema = z.array(\n FeedbinSubscriptionSchema,\n);\n",[144],"dbeef964-432d-11f1-8a75-42b51c65c3df","entry-actions.http.ts","c0f166b6-11bd-11f1-ba45-42dde27851f2",288,["D",1777399966746],53,"http","import { escape } from \"jsr:@std/html@1.0.5/entities\";\nimport { timingSafeEqual } from \"node:crypto\";\nimport { Buffer } from \"node:buffer\";\nimport { feedbin } from \"./feedbin.ts\";\n\ninterface ArticleDetails {\n title: string | null;\n url: string | null;\n feed: string | null;\n published: string | null;\n favicon: string | null;\n}\n\ninterface ActionRequest {\n action: \"read\" | \"unread\";\n entry_id: string;\n secret: string;\n title?: string;\n url?: string;\n feed?: string;\n published?: string;\n favicon?: string;\n}\n\nfunction getArticleDetails(params: URLSearchParams): ArticleDetails | null {\n const title = params.get(\"title\");\n if (!title) return null;\n return {\n title,\n url: params.get(\"url\"),\n feed: params.get(\"feed\"),\n published: params.get(\"published\"),\n favicon: params.get(\"favicon\"),\n };\n}\n\n// Wrapper to compare secrets using constant-time comparison\nfunction secretsMatch(provided: string, configured: string): boolean {\n try {\n const providedBuf = Buffer.from(provided);\n const configuredBuf = Buffer.from(configured);\n return timingSafeEqual(providedBuf, configuredBuf);\n } catch {\n // timingSafeEqual throws if lengths differ; treat as non-match\n return false;\n }\n}\n\nfunction renderConfirmationPage(\n action: \"read\" | \"unread\",\n entryId: string,\n article: ArticleDetails | null,\n): string {\n const actionLabel = action === \"read\" ? \"Marked as read\" : \"Marked as unread\";\n const undoAction = action === \"read\" ? \"unread\" : \"read\";\n const undoActionLabel =\n undoAction === \"read\" ? \"mark as read\" : \"mark as unread\";\n\n const undoParams = new URLSearchParams({\n entry_id: entryId,\n ...(article?.title && { title: article.title }),\n ...(article?.url && { url: article.url }),\n ...(article?.feed && { feed: article.feed }),\n ...(article?.published && { published: article.published }),\n ...(article?.favicon && { favicon: article.favicon }),\n });\n const undoUrl = `/${undoAction}?${undoParams.toString()}`;\n const undoLinkHtml = `Undo (${undoActionLabel})`;\n\n if (!article) {\n return `

Entry ${escape(entryId)} ${actionLabel.toLowerCase()}.

${undoLinkHtml}

`;\n }\n\n const faviconImg = article.favicon\n ? ` $\"\"$ `\n : \"\";\n\n const titleHtml = article.url\n ? `${escape(article.title!)}`\n : `${escape(article.title!)}`;\n\n const feedHtml = article.feed\n ? ` (${escape(article.feed)})`\n : \"\";\n\n const publishedHtml = article.published\n ? ` — ${escape(article.published)}`\n : \"\";\n\n return `\n\n

✓ ${actionLabel}

\n ${faviconImg}${titleHtml}${feedHtml}${publishedHtml}\n

\n ${undoLinkHtml}\n

\n\n`;\n}\n\nfunction renderActionPage(\n entryId: string,\n action: \"read\" | \"unread\",\n article: ArticleDetails | null,\n): string {\n const title = article?.title || `Entry ${entryId}`;\n const actionLabel = action === \"read\" ? \"Mark as read\" : \"Mark as unread\";\n\n const faviconImg = article?.favicon\n ? ` $\"\"$ `\n : \"\";\n\n const articleHtml = article\n ? `

\n ${faviconImg}${escape(title)}\n

\n ${article.feed ? `

${escape(article.feed)}

` : \"\"}\n

`\n : \"\";\n\n return `\n\n \n \n Authenticate\n \n\n\n

\n ${articleHtml}\n

Processing...

\n \n

\n\n \n\n`;\n}\n\nexport default async function (req: Request): Promise {\n const url = new URL(req.url);\n const path = url.pathname;\n\n // GET request from email link - show secret prompt\n if (req.method === \"GET\") {\n const entryId = url.searchParams.get(\"entry_id\");\n const action =\n path === \"/read\" ? \"read\" : path === \"/unread\" ? \"unread\" : null;\n\n if (!entryId || isNaN(Number(entryId))) {\n return new Response(\"Missing or invalid entry_id parameter\", {\n status: 400,\n });\n }\n\n if (!action) {\n return new Response(\"Not found.\", { status: 404 });\n }\n\n const article = getArticleDetails(url.searchParams);\n return new Response(renderActionPage(entryId, action, article), {\n headers: { \"Content-Type\": \"text/html\" },\n });\n }\n\n // POST request from JavaScript - perform action with secret validation\n if (req.method === \"POST\") {\n let actionRequest: ActionRequest;\n try {\n actionRequest = await req.json();\n } catch {\n return new Response(\"Invalid JSON\", { status: 400 });\n }\n\n const { action, entry_id, secret, ...articleData } = actionRequest;\n\n if (!entry_id || isNaN(Number(entry_id))) {\n return new Response(\"Missing or invalid entry_id\", { status: 400 });\n }\n\n if (!action || ![\"read\", \"unread\"].includes(action)) {\n return new Response(\"Missing or invalid action\", { status: 400 });\n }\n\n if (!secret) {\n return new Response(\"Missing secret\", { status: 400 });\n }\n\n // Validate secret\n const configuredSecret = Deno.env.get(\"entry_actions_secret\");\n if (!configuredSecret) {\n console.error(\"entry_actions_secret environment variable not configured\");\n return new Response(\"Server configuration error\", { status: 500 });\n }\n\n const secretMatch = secretsMatch(secret, configuredSecret);\n if (!secretMatch) {\n // Return the prompt page again with an error message\n const article: ArticleDetails = {\n title: articleData.title || null,\n url: articleData.url || null,\n feed: articleData.feed || null,\n published: articleData.published || null,\n favicon: articleData.favicon || null,\n };\n return new Response(\"Invalid secret. Please try again.\", {\n status: 401,\n });\n }\n\n // Secret is valid - perform the action\n const feedbinEndpoint = \"unread_entries.json\";\n const feedbinMethod = action === \"read\" ? \"DELETE\" : \"POST\";\n\n try {\n const res = await feedbin(feedbinEndpoint, feedbinMethod, {\n unread_entries: [Number(entry_id)],\n });\n\n if (!res.ok) {\n const body = await res.text();\n console.error(`Feedbin API error: ${res.status} ${body}`);\n return new Response(\n `Failed to update entry: ${res.status} - ${res.statusText}`,\n { status: 500 },\n );\n }\n\n const article: ArticleDetails = {\n title: articleData.title || null,\n url: articleData.url || null,\n feed: articleData.feed || null,\n published: articleData.published || null,\n favicon: articleData.favicon || null,\n };\n\n return new Response(renderConfirmationPage(action, entry_id, article), {\n headers: { \"Content-Type\": \"text/html\" },\n });\n } catch (err) {\n console.error(`Error performing action: ${err}`);\n return new Response(\"Internal server error\", { status: 500 });\n }\n }\n\n return new Response(\"Method not allowed\", { status: 405 });\n}\n",[152],"0bda6e78-1288-11f1-af7e-42dde27851f2","deno.json","4199ed0e-e682-11f0-a61b-42dde27851f2",190,["D",1772051094608],2,"{\n \"$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 \"imports\": {\n \"@std/html\": \"jsr:@std/html@^1.0.5\"\n }\n}\n",[161],"0e692c8b-92c0-464c-88a0-972154f912f2","README.md","44170dd0-e67f-11f0-bff4-42dde27851f2",["D",1788038711112],21,"# feedbin-email-digest\n\nEmails digest of Feedbin articles matching specified tags. Articles are fetched\nusing the [Feedbin API](https://github.com/feedbin/feedbin-api) and emails are\nsent via SMTP using [Nodemailer](https://nodemailer.com).\n\nRuns via a [cron trigger](https://docs.val.town/vals/cron) on val.town and uses [blob storage](https://docs.val.town/reference/std/blob) to cache Feedbin api responses.\n\nDigest output is grouped by tag, then by feed within each tag. For each feed,\nthe digest includes up to 5 most recent unread entries.\n\nCreated so I could check select RSS feeds at work without needing to log in to Feedbin.\n\nConfigure via the following ENV Vars:\n\n- destination_email - Email address to send digest to\n- timezone - timezone for displaying dates in email\n- feedbin_user - Feedbin username\n- feedbin_password - Feedbin password\n- feedbin_tags - Comma-separated list of tags to include in digest\n- nodemailer_service - Email service to use (see\n https://nodemailer.com/smtp/well-known-services)\n- email_user - sender email address\n- email_password - sender email password\n- entry_actions_url - URL for entry actions (mark read/unread)\n- entry_actions_secret - Secret required to authorize entry actions. Can generate using `openssl rand -hex 16`.\n\n## Enhancements\n\n- [ ] Use scoped blob storage\n\n🤖 Built w/ substantial help from GitHub Copilot\n",[169],"0bc166b2-1288-11f1-a6fb-42dde27851f2","AGENTS.md","41a44088-e682-11f0-8b4d-42dde27851f2",188,["D",1772051094675],1,"You are an advanced assistant specialized in generating Val Town code.\n\n## Core Guidelines\n\n- Ask clarifying questions when requirements are ambiguous\n- Provide complete, functional solutions rather than skeleton implementations\n- Test your logic against edge cases before presenting the final solution\n- Ensure all code follows Val Town's specific platform requirements\n- If a section of code that you're working on is getting too complex, consider refactoring it into subcomponents\n\n## Code Standards\n\n- Generate code in TypeScript or TSX\n- Add appropriate TypeScript types and interfaces for all data structures\n- Prefer official SDKs or libraries than writing API calls directly\n- Ask the user to supply API or library documentation if you are at all unsure about it\n- **Never bake in secrets into the code** - always use environment variables\n- Include comments explaining complex logic (avoid commenting obvious operations)\n- Follow modern ES6+ conventions and functional programming practices if possible\n\n## Types of triggers\n\n### 1. HTTP Trigger\n\n- Create web APIs and endpoints\n- Handle HTTP requests and responses\n- Example structure:\n\n```ts\nexport default async function (req: Request) {\n return new Response(\"Hello World\");\n}\n```\n\nFiles that are HTTP triggers have http in their name like `foobar.http.tsx`\n\n### 2. Cron Triggers\n\n- Run on a schedule\n- Use cron expressions for timing\n- Example structure:\n\n```ts\nexport default async function () {\n // Scheduled task code\n}\n```\n\nFiles that are Cron triggers have cron in their name like `foobar.cron.tsx`\n\n### 3. Email Triggers\n\n- Process incoming emails\n- Handle email-based workflows\n- Example structure:\n\n```ts\nexport default async function (email: Email) {\n // Process email\n}\n```\n\nFiles that are Email triggers have email in their name like `foobar.email.tsx`\n\n## Val Town Standard Libraries\n\nVal Town provides several hosted services and utility functions.\n\n### Blob Storage\n\n```ts\nimport { blob } from \"https://esm.town/v/std/blob\";\nawait blob.setJSON(\"myKey\", { hello: \"world\" });\nlet blobDemo = await blob.getJSON(\"myKey\");\nlet appKeys = await blob.list(\"app_\");\nawait blob.delete(\"myKey\");\n```\n\n### SQLite\n\n```ts\nimport { sqlite } from \"https://esm.town/v/stevekrouse/sqlite\";\nconst TABLE_NAME = \"todo_app_users_2\";\n// Create table - do this before usage and change table name when modifying schema\nawait sqlite.execute(`CREATE TABLE IF NOT EXISTS ${TABLE_NAME} (\n id INTEGER PRIMARY KEY AUTOINCREMENT,\n name TEXT NOT NULL\n)`);\n// Query data\nconst result = await sqlite.execute(\n `SELECT * FROM ${TABLE_NAME} WHERE id = ?`,\n [1],\n);\n```\n\nNote: When changing a SQLite table's schema, change the table's name (e.g., add \\_2 or \\_3) to create a fresh table.\n\n### OpenAI\n\n```ts\nimport { OpenAI } from \"https://esm.town/v/std/openai\";\nconst openai = new OpenAI();\nconst completion = await openai.chat.completions.create({\n messages: [{ role: \"user\", content: \"Say hello in a creative way\" }],\n model: \"gpt-4o-mini\",\n max_tokens: 30,\n});\n```\n\n### Email\n\n```ts\nimport { email } from \"https://esm.town/v/std/email\";\n// By default emails the owner of the val\nawait email({\n subject: \"Hi\",\n text: \"Hi\",\n html: \"

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 {\n parseProject,\n readFile,\n serveFile,\n} from \"https://esm.town/v/std/utils@85-main/index.ts\";\n```\n\n### Available Utilities\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```\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\n ```ts\n import {\n readFile,\n serveFile,\n } 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\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\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 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