Credit: thanks @SlayTheDragons whose PR
https://github.com/dyad-sh/dyad/pull/1665 paved the way for this
implementation.

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Adds _shared module support for Supabase edge functions with
import-map packaging and automatic redeploys; updates deployment to
include full function directories plus shared files, and adds path
utilities and tests.
> 
> - **Supabase Edge Functions**
> - **Shared Modules Support**: Detect `_shared` changes and redeploy
all functions; regular function changes deploy only that function.
> - **Deployment Overhaul**: `deploySupabaseFunctions` now uploads full
function directories plus `_shared` files via multipart form-data, sets
`entrypoint_path`, and writes `import_map.json` (`_shared/` →
`../_shared/`).
> - **Function Discovery & Packaging**: Add file collection helpers
(`listFilesWithStats`, `loadZipEntries`) and path utilities
(`toPosixPath`, `findFunctionDirectory`, `stripSupabaseFunctionsPrefix`)
with signature-based caching for `_shared`.
> - **APIs & Utils**: Introduce `isSharedServerModule`, refine
`isServerFunction` (excludes `_shared`), add
`extractFunctionNameFromPath`, and `buildSignature`.
> - **IPC Changes**
> - Update file edit/rename/delete flows to track shared module edits
and trigger full redeploys; otherwise deploy per-function using
extracted name and `appPath`.
> - **Prompts**
>   - Document `_shared` usage and import pattern in Supabase prompt.
> - **Tests**
> - Add tests for function/shared detection, name extraction, path
handling, and signature building.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
f35599ec0e708e2ef6b7e78ae7901b29953a6dff. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->









<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Adds support for shared modules for Supabase edge functions. Shared code
in supabase/functions/_shared is now bundled via an import map and
triggers redeploys across all functions when changed.

- **New Features**
- Detects shared modules in supabase/functions/_shared and redeploys all
functions when they change.
- Deploys full function directories plus shared files, and writes an
import_map.json that resolves "_shared/" imports.
- Auto-deploys only the affected function on file changes; switches to
redeploy-all when a shared module is touched.

- **Refactors**
- deploySupabaseFunction now uploads multiple files (function + shared)
using multipart form-data and sets entrypoint/import map.
- Added file collection, path utilities, and shared-file caching via
content signatures to reduce redundant reads.
- Updated deployAllSupabaseFunctions to skip non-function dirs (e.g.,
_shared) and use functionPath.
- Added tests for function/shared detection, path handling, and
signature building.

<sup>Written for commit 302d84625d9e61477db9ada052a027b29ff18cef.
Summary will update automatically on new commits.</sup>

<!-- End of auto-generated description by cubic. -->