Dulicated bindings in auto-generated wrangler.json file with Nuxt 3 Layers architecture

Environment

Any Node and Bun versions. The nitro package has the latest version.

Reproduction

Related repo:
https://github.com/serhii-chernenko/nuxt-layers-cloudflare-issue-v2

Clone repo, install packages, and build the app

git clone git@github.com:serhii-chernenko/nuxt-layers-cloudflare-issue-v2.git
bun install
bun run build:app

Verify a generated wrangler.json file.

cat src/apps/app/dist/_worker.js/wrangler.json

Expected output:

{
  "compatibility_date": "2025-01-27",
  "kv_namespaces": [
    {
      "binding": "KV_CORE",
      "id": "SET_IN_ENV"
    },
    {
      "binding": "KV_CMS",
      "id": "SET_IN_ENV"
    },
    {
      "binding": "KV_CORE",
      "id": "SET_IN_ENV"
    }
  ],
  "d1_databases": [
    {
      "binding": "DB_CORE",
      "database_id": "SET_IN_ENV"
    },
    {
      "binding": "DB_CMS",
      "database_id": "SET_IN_ENV"
    },
    {
      "binding": "DB_CORE",
      "database_id": "SET_IN_ENV"
    }
  ],
  "name": "nuxt-layers-cloudflare-issue-v2",
  "pages_build_output_dir": "..",
  "compatibility_flags": [
    "nodejs_compat",
    "no_nodejs_compat_v2"
  ]
}

As you can see, KV_CORE and DB_CORE duplicated twice.

Describe the bug

If you run

bun run dev:app

You have to see the error

ERROR  Failed to initialize wrangler bindings proxy Processing dist/_worker.js/wrangler.json configuration:
│   - KV_CORE assigned to multiple KV Namespaces bindings.
│   - DB_CORE assigned to multiple D1 Databases bindings.
│   - Bindings must have unique names, so that they can all be referenced in the worker.
│     Please change your bindings to have unique names.

Additional context

Explanation

The issue happens because I extend one layer in another one and then both are extended in the end application:

• Core Admin → App
• Core Admin → CMS Admin (because this layer needs functionality of the Core Admin layer) → App

I can avoid this issue by extending the chain this way:

• Core Admin → CMS Admin → App

Just by removing:

• Core Admin → App

But I want to have the explicit extending in the end app.

Suggestion

Filtering bindings in each array available for the nitro.cloudflare.wrangler object such as kv_namespaces, d1_databases, etc. by the same name.

Logs

Start with the linked reproduction repository, run bun install and bun run build:app, then inspect src/apps/app/dist/_worker.js/wrangler.json. Trace how the Core Admin and CMS Admin layers contribute kv_namespaces and d1_databases to the nitro.cloudflare.wrangler configuration. Done means generated bindings are unique and bun run dev:app no longer reports duplicate bindings.