edge-functions

Supabase Edge Functions

Runtime

Deno. Entry point: Deno.serve(). Files live in supabase/functions/<name>/index.ts.

New Function Scaffold

import { initSentry, handleError } from "../_shared/sentry.ts";

initSentry();

const corsHeaders = {
  "Access-Control-Allow-Origin": "*",
  "Access-Control-Allow-Headers": "authorization, x-client-info, apikey, content-type",
};

Deno.serve(async (req: Request) => {
  if (req.method === "OPTIONS") return new Response("ok", { headers: corsHeaders });

  try {
    const body = await req.json();
    const result = { message: "Hello" };
    return new Response(JSON.stringify(result), {
      headers: { ...corsHeaders, "Content-Type": "application/json" },
    });
  } catch (error) {
    return handleError(error, { functionName: "my-function", corsHeaders });
  }
});

For AI calls, wrap with withTrace() — see the langfuse-tracing skill.

Imports

• Shared code: ../_shared/sentry.ts, ../_shared/langfuse/gemini.ts
• External: via import map in supabase/functions/deno.json
• Convention: npm: prefix for npm packages, URLs for Deno packages

Calling from Frontend/Mobile

const { data, error } = await supabase.functions.invoke('my-function', {
  body: { prompt: 'Hello' },
});

Database Migrations

Path: supabase/migrations/. Naming: 00000000000000_slug.sql.

Rules:

• Enable RLS on every table
• Policies use auth.uid() for row-level access
• Add updated_at trigger for mutable tables
• Index foreign keys and common filter columns
• Storage bucket policies: auth.uid()::text = (storage.foldername(name))[1]

Local Development

mise run supabase:function   # Starts functions with hot reload

Env vars for functions go in supabase/functions/.env.local.

Deploy

supabase functions deploy <function-name>