blob.serve() ignores { driver: 'fs' } config and crashes trying to use R2 when wrangler.jsonc is present

[jeffreytung7]

Description

There is a "split-brain" behavior between blob.handleUpload() and blob.serve() when forcing the local filesystem driver in development environments that contain a wrangler.jsonc file.

The Setup:
I have a Nuxt 4 app using the cloudflare-module preset. During standard local development (nuxt dev), I want to bypass R2 entirely and use the local filesystem. I explicitly configured the FS driver:

export default defineNuxtConfig({
  hub: {
    blob: { driver: 'fs', dir: '.data/blob' }
  }
})

The Bug:

1. When I call blob.handleUpload(), NuxtHub correctly respects the config. The terminal logs ℹ hub:blob using fs driver and successfully writes the file to .data/blob/test-uploads/image.png.
2. However, when I immediately call blob.serve(event, pathname), it crashes with a 500 error: R2 binding "BLOB" not found.

Stack Trace:

Error: R2 binding "BLOB" not found
  at getBucket (.../@nuxthub/core/dist/blob/lib/drivers/cloudflare-r2.mjs:18:13)
  at Object.getArrayBuffer (.../@nuxthub/core/dist/blob/lib/drivers/cloudflare-r2.mjs:55:22)
  at Object.serve (.../@nuxthub/core/dist/blob/lib/storage.mjs:20:40)

Why it's happening:
It appears that while the upload utility respects the explicit driver: 'fs' override, the serve() utility aggressively auto-detects the wrangler.jsonc in the root and attempts to use the cloudflare-r2 driver to fetch the BLOB binding. Since I am running a standard local dev server (no Miniflare/--remote), the binding doesn't exist and it throws an error, completely ignoring the fs fallback where the file actually lives.

Expected Behavior:
blob.serve() should respect the explicit { driver: 'fs' } configuration defined in nuxt.config.ts, just like blob.handleUpload() does, rather than falling back to R2 auto-detection.

Temporary Workaround:
Manually checking environment variables to bypass blob.serve() and stream the file via Node's fs.createReadStream during local development.