AI Prompt: Specify the following for Cursor rules
How to use
Copy the prompt to a file in your repo.
Use the "include file" feature from your AI tool to include the prompt when chatting with your AI assistant. For example, with GitHub Copilot, use #<filename>, in Cursor, use @Files, and in Zed, use /file.
Prompt
_113---_113# Specify the following for Cursor rules_113description: Coding rules for Supabase Edge Functions_113globs: "supabase/functions/**/*.ts"_113---_113_113You're an expert in writing TypeScript and Deno JavaScript runtime. Generate **high-quality Supabase Edge Functions** that adhere to the following best practices:_113_113## Guidelines_113_1131. Try to use Web APIs and Deno’s core APIs instead of external dependencies (eg: use fetch instead of Axios, use WebSockets API instead of node-ws)_1132. If you are reusing utility methods between Edge Functions, add them to `supabase/functions/_shared` and import using a relative path. Do NOT have cross dependencies between Edge Functions._1133. Do NOT use bare specifiers when importing dependecnies. If you need to use an external dependency, make sure it's prefixed with either `npm:` or `jsr:`. For example, `@supabase/supabase-js` should be written as `npm:@supabase/supabase-js`._1134. For external imports, always define a version. For example, `npm:@express` should be written as `npm:[email protected]`._1135. For external dependencies, importing via `npm:` and `jsr:` is preferred. Minimize the use of imports from @`deno.land/x` , `esm.sh` and @`unpkg.com` . If you have a package from one of those CDNs, you can replace the CDN hostname with `npm:` specifier._1136. You can also use Node built-in APIs. You will need to import them using `node:` specifier. For example, to import Node process: `import process from "node:process". Use Node APIs when you find gaps in Deno APIs._1137. Do NOT use `import { serve } from "https://deno.land/[email protected]/http/server.ts"`. Instead use the built-in `Deno.serve`._1138. Following environment variables (ie. secrets) are pre-populated in both local and hosted Supabase environments. Users don't need to manually set them:_113 * SUPABASE_URL_113 * SUPABASE_ANON_KEY_113 * SUPABASE_SERVICE_ROLE_KEY_113 * SUPABASE_DB_URL_1139. To set other environment variables (ie. secrets) users can put them in a env file and run the `supabase secrets set --env-file path/to/env-file`_11310. A single Edge Function can handle multiple routes. It is recommended to use a library like Express or Hono to handle the routes as it's easier for developer to understand and maintain. Each route must be prefixed with `/function-name` so they are routed correctly._11311. File write operations are ONLY permitted on `/tmp` directory. You can use either Deno or Node File APIs._11312. Use `EdgeRuntime.waitUntil(promise)` static method to run long-running tasks in the background without blocking response to a request. Do NOT assume it is available in the request / execution context._113_113## Example Templates_113_113### Simple Hello World Function_113_113```tsx_113interface reqPayload {_113 name: string;_113}_113_113console.info('server started');_113_113Deno.serve(async (req: Request) => {_113 const { name }: reqPayload = await req.json();_113 const data = {_113 message: `Hello ${name} from foo!`,_113 };_113_113 return new Response(_113 JSON.stringify(data),_113 { headers: { 'Content-Type': 'application/json', 'Connection': 'keep-alive' }}_113 );_113});_113_113```_113_113### Example Function using Node built-in API_113_113```tsx_113import { randomBytes } from "node:crypto";_113import { createServer } from "node:http";_113import process from "node:process";_113_113const generateRandomString = (length) => {_113 const buffer = randomBytes(length);_113 return buffer.toString('hex');_113};_113_113const randomString = generateRandomString(10);_113console.log(randomString);_113_113const server = createServer((req, res) => {_113 const message = `Hello`;_113 res.end(message);_113});_113_113server.listen(9999);_113```_113_113### Using npm packages in Functions_113_113```tsx_113import express from "npm:[email protected]";_113_113const app = express();_113_113app.get(/(.*)/, (req, res) => {_113 res.send("Welcome to Supabase");_113});_113_113app.listen(8000);_113_113```_113_113### Generate embeddings using built-in @Supabase.ai API_113_113```tsx_113const model = new Supabase.ai.Session('gte-small');_113_113Deno.serve(async (req: Request) => {_113 const params = new URL(req.url).searchParams;_113 const input = params.get('text');_113 const output = await model.run(input, { mean_pool: true, normalize: true });_113 return new Response(_113 JSON.stringify(_113 output,_113 ),_113 {_113 headers: {_113 'Content-Type': 'application/json',_113 'Connection': 'keep-alive',_113 },_113 },_113 );_113});_113_113```