Using Wrangler environments and the Nuxt template

[lapis prairie]

Hi everyone, this is my first time using cloudflare so sorry if I'm missing something obvious!

I've created a Nuxt project with the help of npm create cloudflare I then deployed it successfully with no changes. Now I want to setup environments so I can run a separate dev worker with a separate D1 database and then deploy them from GitLab.
So I made the following changes to the wrangler file:

{
    "$schema": "node_modules/wrangler/config-schema.json",
    "main": "./.output/server/index.mjs",
    "compatibility_date": "2025-11-01",
    "name": "dialnote-prod",
    "assets": {
        "binding": "ASSETS",
        "directory": "./.output/public/"
    },
    "observability": {
        "enabled": true
    },
    "env": {
        "dev": {
            "name": "dialnote-dev",
            "d1_databases": [
                {
                    "binding": "db",
                    "database_name": "dialnote_dev",
                    "database_id": "removed"
                }
            ]
        },
        "prod": {
            "name": "dialnote-prod",
            "d1_databases": [
                {
                    "binding": "db",
                    "database_name": "dialnote_prod",
                    "database_id": "removed"
                }
            ]
        }
    }
}

At first I thought I could use --env prod but then realised after trying that I can't do that because of vite generating a flattened file at build (I think).
So I then changed the build command instead to this CLOUDFLARE_ENV=prod npm run build but then got this error:

21:18:00.037     - Configuration being used: ".output/server/wrangler.json"
21:18:00.037     - Original user's configuration: "wrangler.jsonc"
21:18:00.037     - Deploy configuration file: ".wrangler/deploy/config.json"
21:18:00.043    
21:18:00.110    ✘ [ERROR] Processing .output/server/wrangler.json configuration:
21:18:00.110    
21:18:00.110        - Redirected configurations cannot include environments but the following have been found:
21:18:00.110              - dev
21:18:00.110              - prod
21:18:00.110      
21:18:00.110      
21:18:00.110          Such configurations are generated by tools, meaning that one of the tools
21:18:00.110          your application is using is generating the incorrect configuration.
21:18:00.111          Report this issue to the tool's author so that this can be fixed there.
21:18:00.111    
21:18:00.111    
21:18:00.130    
21:18:00.131    Cloudflare collects anonymous telemetry about your usage of Wrangler. Learn more at https://github.com/cloudflare/workers-sdk/tree/main/packages/wrangler/telemetry.md
21:18:00.151    🪵  Logs were written to "/opt/buildhome/.config/.wrangler/logs/wrangler-2025-11-07_10-17-59_387.log"
21:18:00.292    Failed: error occurred while running deploy command

I then tried setting the environment variable then building locally and then looked at .output/server/wrangler.json which was:

{
  "compatibility_date": "2025-11-01",
  "$schema": "node_modules/wrangler/config-schema.json",
  "main": "index.mjs",
  "name": "dialnote",
  "assets": {
    "binding": "ASSETS",
    "directory": "..\\public"
  },
  "observability": {
    "enabled": true
  },
  "env": {
    "development": {
      "d1_databases": [
        {
          "binding": "db",
          "database_name": "dialnote_dev",
          "database_id": "removed"
        }
      ]
    },
    "production": {
      "d1_databases": [
        {
          "binding": "db",
          "database_name": "dialnote_prod",
          "database_id": "removed"
        }
      ]
    }
  },
  "compatibility_flags": [
    "nodejs_compat",
    "no_nodejs_compat_v2"
  ]
}

So it appears it's not being flattened?

If more info is needed let me know, Thanks in advanced!🙂