Bug report

• I confirm this is a bug with Supabase, not with my own application.
• I confirm I have searched the Docs, GitHub Discussions, and Discord.

Describe the bug

When running supabase functions serve, if a function imports a local file specified in the import_map.json file that is outside the function folder, the command fails. When running an edge-function using the deno run --allow-all ./supabase/functions/my-function/index.ts command, one is able to test and run the function.

...
Download https://deno.land/x/jose@v4.4.0/lib/check_p2s.ts
Download https://deno.land/x/jose@v4.4.0/runtime/bogus.ts
Download https://deno.land/x/jose@v4.4.0/runtime/subtle_rsaes.ts
error: Module not found "file:///home/deno/lib/cors.ts".
    at file:///home/deno/functions/my-function/index.ts:9:29
2023/05/12 11:18:51 Sent Header: Host [docker]
2023/05/12 11:18:51 Sent Header: User-Agent [Go-http-client/1.1]
2023/05/12 11:18:51 Send Done
2023/05/12 11:18:51 Recv First Byte

To Reproduce

1. Create a new edge function directory and index.ts inside the ./supabase/functions dir.
2. Create a util file outside the new function directory. For example, inside ./supabase/lib/cors.ts.
3. Import cors.ts inside the index.ts file.

// index.ts
import cors from '@backend/lib/cors.ts';
...

1. Specify the path to the util file in import_map.json relative to the location of the import_map.json file

// this file is inside ./supabase
{
  "imports": {
    "@backend/": "./",
}

1. Run supabase functions serve my-function

Expected behavior

The local edge function runs successfully as it does in deno.

Screenshots

N/A

System information

• OS: [e.g. macOS, Windows]
• Browser (if applies) [e.g. chrome, safari]
• Version of supabase-js: [e.g. 2.21.0]
• Version of supabase cli: [e.g. 1.57.3]
• Version of Node.js: [e.g. 16]

Additional context

Add any other context about the problem here.